The surface wrinkled structures of materials endow them with various properties,such as hydrophilicity/hydrophobicity,adhesion,large specific surface area,etc.,which have been applied in self-cleaning surfaces,strong ...The surface wrinkled structures of materials endow them with various properties,such as hydrophilicity/hydrophobicity,adhesion,large specific surface area,etc.,which have been applied in self-cleaning surfaces,strong adhesives,ultra-sensitive sensors,etc.However,traditional wrinkled surfaces with single wrinkled structures cannot meet the demand for intelligent regulation,making the widespread application rather challenging.Recently,stimuli-responsive wrinkled surfaces,which are capable of reversibly regulating wrinkled structures(amplitude,period,etc.),have been developed to broaden their applications.Here,an overview of stimuli-responsive wrinkled surfaces is provided.First,the mechanism and design principle of surface wrinkled structures based on film/substrate bilayer systems are comprehensively analyzed.Subsequently,the latest advancements in the preparation and application of stimuli-responsive wrinkled surfaces are presented from the perspective of types of external stimuli(light,temperature,pH,humidity,solvent,and strain).Finally,the current challenges and future prospects of the stimuli-responsive wrinkled surfaces are illustrated.This review provides some insights and valuable references for the rational design of stimuli-responsive wrinkled surfaces.展开更多
With the increasing demand for terahertz(THz)technology in security inspection,medical imaging,and flexible electronics,there is a significant need for stretchable and transparent THz electromagnetic interference(EMI)...With the increasing demand for terahertz(THz)technology in security inspection,medical imaging,and flexible electronics,there is a significant need for stretchable and transparent THz electromagnetic interference(EMI)shielding materials.Existing EMI shielding materials,like opaque metals and carbon-based films,face challenges in achieving both high transparency and high shielding efficiency(SE).Here,a wrinkled structure strategy was proposed to construct ultra-thin,stretchable,and transparent terahertz shielding MXene films,which possesses both isotropous wrinkles(height about 50 nm)and periodic wrinkles(height about 500 nm).Compared to flat film,the wrinkled MXene film(8 nm)demonstrates a remarkable 36.5%increase in SE within the THz band.The wrinkled MXene film exhibits an EMI SE of 21.1 dB at the thickness of 100 nm,and an average EMI SE/t of 700 dBμm^(−1)over the 0.1-10 THz.Theoretical calculations suggest that the wrinkled structure enhances the film’s conductivity and surface plasmon resonances,resulting in an improved THz wave absorption.Additionally,the wrinkled structure enhances the MXene films’stretchability and stability.After bending and stretching(at 30%strain)cycles,the average THz transmittance of the wrinkled film is only 0.5%and 2.4%,respectively.The outstanding performances of the wrinkled MXene film make it a promising THz electromagnetic shielding materials for future smart windows and wearable electronics.展开更多
Nowadays,the increasing electromagnetic waves generated by wearable devices are becoming an emerging issue for human health,so stretchable electromagnetic interference(EMI)shielding materials are highly demanded.Eleph...Nowadays,the increasing electromagnetic waves generated by wearable devices are becoming an emerging issue for human health,so stretchable electromagnetic interference(EMI)shielding materials are highly demanded.Elephant trunks are capable of grabbing fragile vegetation and tearing trees thanks not only to their muscles but also to their folded skins.Inspired by the wrinkled skin of the elephant trunks,herein,we propose a winkled conductive film based on single-walled carbon nanotubes(SWCNTs)for multifunctional EMI applications.The conductive film has a sandwich structure,which was prepared by coating SWCNTs on both sides of the stretched elastic latex cylindrical substrate.The shrinking-induced winkled conductive network could withstand up to 200%tensile strain.Typically,when the stretching direction is parallel to the polarization direction of the electric field,the total EMI shielding effectiveness could surprisingly increase from 38.4 to 52.7 dB at 200%tensile strain.It is mainly contributed by the increased connection of the SWCNTs.In addition,the film also has good Joule heating performance at several voltages,capable of releasing pains in injured joints.This unique property makes it possible for strain-adjustable multifunctional EMI shielding and wearable thermotherapy applications.展开更多
Available onlineSilicon monoxide(SiO)is a promising anode material fo r lithium-ion batteries(LIBs)due to its high theoretical specific capacity(~2400 mAh/g),low working potential(<0.5 V vs.Li^+/Li),low cost,easy s...Available onlineSilicon monoxide(SiO)is a promising anode material fo r lithium-ion batteries(LIBs)due to its high theoretical specific capacity(~2400 mAh/g),low working potential(<0.5 V vs.Li^+/Li),low cost,easy synthesis,nontoxicity,abundant natural source and smaller volume expansion than Si.However,low intrinsic electrical conductivity,low initial Coulombic efficiency(ICE)and inevitable volume expansion(~200%)impede its practical application.Here we fabricate SiO/wrinkled MXene composite(SiO-WM)by an electrostatic self-assembly method.Importantly,this method is simple,scalable and taking into account all the issues of SiO.As a result,the SiO-WM exhibits imp roved rate capability,cycling performance and ICE than bare SiO.展开更多
Nowadays,the employing of molecular imprinting technique in the analysis and separation of proteins from complex biological samples has been widely favored by researchers.To enrich the types of surface protein imprint...Nowadays,the employing of molecular imprinting technique in the analysis and separation of proteins from complex biological samples has been widely favored by researchers.To enrich the types of surface protein imprinted materials and expand the application fields of graphene materials,novel surface molecular imprinted polymers(MIPs)based on magnetic graphene microspheres Fe_(3)O_(4)@r GO@MIPs are first synthesized in this paper.Fe_(3)O_(4)@r GO@MIPs are prepared by oxidative self-polymerization of dopamine on the surface of magnetic graphene(Fe_(3)O_(4)@r GO)composite microspheres.Bovine serum albumin(BSA)is selected as protein template.Fe_(3)O_(4)@r GO microspheres with wrinkled flower-like structure are obtained by compounding Fe_(3)O_(4)and graphene oxide in an appropriate ratio via the method of high-temperature reduction self-assembly.The microspheres exhibit promising dispersibility,high external surface area,rich pore structure,and sufficient magnetic properties.These advantages not only prevent the agglomeration of imprinted microspheres in the aqueous phase,which is conducive to contact and static adsorption,but also increase the amount of protein imprinting.Additionally,sufficient magnetic properties ensure fast and effective separation of the adsorbents.While the adsorption capacity is increased,the separation procedure becomes simple.The binding capacity of Fe_(3)O_(4)@r GO@MIPs for BSA can reach 317.58 mg/g within 60 min,and the imprinting factor(IF)is 4.24.More importantly,Fe_(3)O_(4)@r GO@MIPs can specifically recognize the target BSA from the mixed proteins and the actual sample.There is no significant decrease in the adsorption amount,IF,and magnetic properties after eight runs.It is promising to be used in the separation of proteins from the actual biological samples.展开更多
Sodium-ion batteries（SIBs） recently have received a worldwide attention due to the resource abundance of sodium and similar battery chemistry with lithium-ion batteries（LIBs）. However, search for suitable anodes f...Sodium-ion batteries（SIBs） recently have received a worldwide attention due to the resource abundance of sodium and similar battery chemistry with lithium-ion batteries（LIBs）. However, search for suitable anodes for SIBs still remains a challenge since graphitized carbon, the anode for commercial LIBs, usually exhibits low electrochemical Na-storage activity. In this work, a unique graphene-reinforced Ni3S2 thin film（Ni3S2/G） has been constructed and investigated as a promising anode for SIBs. The Ni3S2 thin film has a thickness of 200–300 nm and is composed of small sized crystals of around 100 nm. The graphene has a wrinkled surface profile which offers three-dimensional networks for electron conductivity and structural reinforcement. The Ni3S2/G thin film exhibits high capacity, excellent cycling stability and good rate capability due to the introduction of wrinkled graphene. Ni3S2/G can deliver a high initial capacity of 791 m Ah g-1at 50 m A g-1. The capacity can be maintained at 563 m Ah g-1after 110 cycles.This work provides a unique design for high-performance SIBs anodes.展开更多
Terahertz radiation (THzR) consists of electromagnetic waves within the band of frequencies from 0.3 to 3 terahertz with the wavelengths of radiation in the range from 0.1 mm to 1 mm, respectively. The technology for ...Terahertz radiation (THzR) consists of electromagnetic waves within the band of frequencies from 0.3 to 3 terahertz with the wavelengths of radiation in the range from 0.1 mm to 1 mm, respectively. The technology for generating and manipulating THzR is still in its initial stage. Herein, we demonstrate that the wrinkled Si1–xGex/Si1–yGey films can be used as radiation sources, which emit electromagnetic waves (EMW) in a very wide range of the frequencies including the terahertz band from 0.3 to 3 THz and far IR from 3 THz to 20 THz. These findings provide the theoretical foundation for the wrinkled nanofilm radiation emission and may allow, to some extent, to fill the terahertz gap.展开更多
Flexible multidirectional strain sensors are crucial to accurately determining the complex strain states involved in emerging sensing applications.Although considerable efforts have been made to construct anisotropic ...Flexible multidirectional strain sensors are crucial to accurately determining the complex strain states involved in emerging sensing applications.Although considerable efforts have been made to construct anisotropic structures for improved selective sensing capabilities,existing anisotropic sensors suffer from a trade-off between high sensitivity and high stretchability with acceptable linearity.Here,an ultrasensitive,highly selective multidirectional sensor is developed by rational design of functionally different anisotropic layers.The bilayer sensor consists of an aligned carbon nanotube(CNT)array assembled on top of a periodically wrinkled and cracked CNT-graphene oxide film.The transversely aligned CNT layer bridge the underlying longitudinal microcracks to effectively discourage their propagation even when highly stretched,leading to superior sensitivity with a gauge factor of 287.6 across a broad linear working range of up to 100%strain.The wrinkles generated through a pre-straining/releasing routine in the direction transverse to CNT alignment is responsible for exceptional selectivity of 6.3,to the benefit of accurate detection of loading directions by the multidirectional sensor.This work proposes a unique approach to leveraging the inherent merits of two cross-influential anisotropic structures to resolve the trade-off among sensitivity,selectivity,and stretchability,demonstrating promising applications in full-range,multi-axis human motion detection for wearable electronics and smart robotics.展开更多
The axisymmetric deformation of a paraboloidal membrane inflatable structure subjected to a concentrated load at its apex and a uniform internal pressure was analyzed. The wrinkle angle was obtained according to the m...The axisymmetric deformation of a paraboloidal membrane inflatable structure subjected to a concentrated load at its apex and a uniform internal pressure was analyzed. The wrinkle angle was obtained according to the membrane theory when wrinkles appeared and determined the wrinkle region. The wrinkled deformation was obtained based on the relaxed energy function. The effects of inflation pressure and concentrated loads on the wrinkle angle were analyzed and the deformation was obtained at the apex of structure. According to the numerical analysis, the shape of deformed meridians with wrinkles was obtained.展开更多
To solve the problems of divergence,low accuracy and project application of membrane wrinkling analysis,an analysis method of zero shear modulus and equivalent stiffness was proposed.This method is an improvement to t...To solve the problems of divergence,low accuracy and project application of membrane wrinkling analysis,an analysis method of zero shear modulus and equivalent stiffness was proposed.This method is an improvement to the previous method (Method I) of local coordinate transposition and stiffness equivalence.The new method is derived and the feasibility is theoretically proved.A small-scale membrane structure is analyzed by the two methods,and the results show that the computational efficiency of the new method (Method II) is approximately 23 times that of Method I.When Method II is applied to a large-scale membrane stadium structure,it is found that this new method can quickly make the second principal stress of one way wrinkled elements zero,and make the two principal stresses of two-way wrinkled elements zero as well.It could attain the correct load responses right after the appearance of wrinkled elements,which indicates that Method II can be applied to wrinkling analysis of large-scale membrane structures.展开更多
Dragonflies are highly skilled flyers in the natural world,capable of performing flight maneuvers such as lateral flight,hovering,and backward flight—many of which are difficult for human aircraft to achieve.The exce...Dragonflies are highly skilled flyers in the natural world,capable of performing flight maneuvers such as lateral flight,hovering,and backward flight—many of which are difficult for human aircraft to achieve.The exceptional flight abilities of dragonflies are closely related to their wings.The wrinkled and venous structures on their wings provide aerodynamic advantages that flat wings with equal thickness,equal projected area,and identical shape profiles do not possess.At the same time,dragonfly wings have a certain degree of flexibility,which causes deformation under aerodynamic forces during flight.This deformation,in turn,affects the aerodynamic characteristics of the wings.To reveal the impact of the wing wrinkling and flexibility on the aerodynamic properties,this study established a three-dimensional CFD model and CSD model of the dragonfly’s wrinkled forewing based on previous measurements and research results using 3D modeling software.Modal analysis was performed to verify the model’s accuracy.Using the CFD method and a CFD/CSD bidirectional fluid-structure coupling calculation method,numerical simulations were conducted on the aerodynamic characteristics of both rigid and flexible wrinkled forewings,as well as flat forewings with equal thickness,equal projected area,and identical shape profiles during gliding flight.The results showed that the stronger leading-edge vortex and the attached vortices within the wrinkled structure improve the aerodynamic performance of the dragonfly’s forewings.Additionally,for the wrinkled forewings,the flexibility factor causes the wing veins and membrane to deform under aerodynamic loads.The pressure difference between the upper and lower surfaces of the flexible forewing is reduced compared to the rigid forewing,leading to a decrease in both lift and drag.However,in terms of the final result,the aerodynamic performance of the dragonfly’s forewings is enhanced.展开更多
Core-shell structured magnetic wrinkled organosilica-based metal-enzyme integrated catalysts were synthesized,and their catalytic performances were studied in the chemoenzymatic dynamic kinetic resolution of chiral am...Core-shell structured magnetic wrinkled organosilica-based metal-enzyme integrated catalysts were synthesized,and their catalytic performances were studied in the chemoenzymatic dynamic kinetic resolution of chiral amines in an organic solvent,as well as in the chemoenzymatic synthesis of chiral alcohols in water.Structureperformance studies revealed the important influence of their tunable structure and composition on the optimization of activity,stability,and recyclability in chemoenzymatic catalysis.展开更多
Wearable strain sensors(WSSs)have found widespread applications,where the key is to optimize their sensing and wearing performances.However,the intricate material designs for developing WSSs often rely on costly reage...Wearable strain sensors(WSSs)have found widespread applications,where the key is to optimize their sensing and wearing performances.However,the intricate material designs for developing WSSs often rely on costly reagents and/or complex pro-cesses,which bring barriers to their large-scale production and use.Herein,a facile and affordable(material cost of<$0.002/cm2)method is presented for fabricating conductive bandage(CB)-based WSSs by electrospraying a carbon nanotube(CNT)layer on commercial self-adhesive bandages with excellent biosafety,stretchability,mechanical compliance,breathability and cost effectiveness.The wrinkled and fibrous structures of self-adhesive bandages were rationally leverage to control the geometry of CNT layer,thereby ensuring tunable mechanoelectrical sensitivities(gauge factors of 2~850)of CBs.Moreover,a strain-sensing mechanism directly mediated by the highly wrinkled microstructure is unveiled,which can work in synergy with a training-loosened-fibrous microstructure.The excellent performance of CBs for monitoring full-range strain signals in human bodies was further demonstrated.CBs would possess great potential for being developed into WSSs because of their outstanding cost-performance ratio.展开更多
With the rapid development of flexible wearable electronics,the demand for stretchable energy storage devices has surged.In this work,a novel gradient-layered architecture was design based on single-pore hollow lignin...With the rapid development of flexible wearable electronics,the demand for stretchable energy storage devices has surged.In this work,a novel gradient-layered architecture was design based on single-pore hollow lignin nanospheres(HLNPs)-intercalated two-dimensional transition metal carbide(Ti_(3)C_(2)T_(x) MXene)for fabricating highly stretchable and durable supercapacitors.By depositing and inserting HLNPs in the MXene layers with a bottom-up decreasing gradient,a multilayered porous MXene structure with smooth ion channels was constructed by reducing the overstacking of MXene lamella.Moreover,the micro-chamber architecture of thin-walled lignin nanospheres effectively extended the contact area between lignin and MXene to improve ion and electron accessibility,thus better utilizing the pseudocapacitive property of lignin.All these strategies effectively enhanced the capacitive performance of the electrodes.In addition,HLNPs,which acted as a protective phase for MXene layer,enhanced mechanical properties of the wrinkled stretchable electrodes by releasing stress through slip and deformation during the stretch-release cycling and greatly improved the structural integrity and capacitive stability of the electrodes.Flexible electrodes and symmetric flexible all-solid-state supercapacitors capable of enduring 600%uniaxial tensile strain were developed with high specific capacitances of 1273 mF cm^(−2)(241 F g^(−1))and 514 mF cm^(−2)(95 F g^(−1)),respectively.Moreover,their capacitances were well preserved after 1000 times of 600%stretch-release cycling.This study showcased new possibilities of incorporating biobased lignin nanospheres in energy storage devices to fabricate stretchable devices leveraging synergies among various two-dimensional nanomaterials.展开更多
Developing advanced stealth devices to cope with radar-infrared(IR)fusion detection and diverse application scenarios is increasingly demanded,which faces significant challenges due to conflicting microwave and IR clo...Developing advanced stealth devices to cope with radar-infrared(IR)fusion detection and diverse application scenarios is increasingly demanded,which faces significant challenges due to conflicting microwave and IR cloaking mechanisms and functional integration limitations.Here,we propose a multiscale hierarchical structure design,integrating wrinkled MXene IR shielding layer and flexible Fe_(3)O_(4)@C/PDMS microwave absorption layer.The top wrinkled MXene layer induces the intensive diffuse reflection effect,shielding IR radiation signals while allowing microwave to pass through.Meanwhile,the permeable microwaves are assimilated into the bottom Fe_(3)O_(4)@C/PDMS layer via strong magneto-electric synergy.Through theoretical and experimental optimization,the assembled stealth devices realize a near-perfect stealth capability in both X-band(8–12 GHz)and long-wave infrared(8–14μm)wavelength ranges.Specifically,it delivers a radar cross-section reduction of−20 dB m^(2),a large apparent temperature modulation range(ΔT=70℃),and a low average IR emissivity of 0.35.Additionally,the optimal device demonstrates exceptional curved surface conformability,self-cleaning capability(contact angle≈129°),and abrasion resistance(recovery time≈5 s).This design strategy promotes the development of multispectral stealth technology and reinforces its applicability and durability in complex and hostile environments.展开更多
The present manuscript describes a facile and versatile method for preparing uniform wrinkled silica microspheres with diameters of tens of microns.The method comprises a one-pot emulsion/sol-gel method using silica p...The present manuscript describes a facile and versatile method for preparing uniform wrinkled silica microspheres with diameters of tens of microns.The method comprises a one-pot emulsion/sol-gel method using silica precursors of organosilane and tetraethoxysilane.By controlling the sol-to-gel transition of the silica precursors,a series of silica microspheres based on uniform emulsion droplets was synthesized by membrane emulsification.The silica microspheres had a variety of surface morphologies ranging from smooth,maze-like wrinkles to polygon-like ravines.It was possible to alter the surface morphologies of the microspheres by controlling the amount of organosilane in the dispersed phase and the amount of ammonia catalyst in the continuous phase of the emulsion.The grooves on the wrinkled microspheres were able to trap polymer nanoparticles of matching size,thereby demonstrating the potential usefulness of the microspheres in separation science and drug delivery.展开更多
Adenosine triphosphate(ATP)is closely related to the pathogenesis of certain diseases,so the detection of trace ATP is of great significance to disease diagnosis and drug development.Graphene field-effect transistors(...Adenosine triphosphate(ATP)is closely related to the pathogenesis of certain diseases,so the detection of trace ATP is of great significance to disease diagnosis and drug development.Graphene field-effect transistors(GFETs)have been proven to be a promising platform for the rapid and accurate detection of small molecules,while the Debye shielding limits the sensitive detection in real samples.Here,a three-dimensional wrinkled graphene field-effect transistor(3D WG-FET)biosensor for ultra-sensitive detection of ATP is demonstrated.The lowest detection limit of 3D WG-FET for analyzing ATP is down to 3.01 aM,which is much lower than the reported results.In addition,the 3D WG-FET biosensor shows a good linear electrical response to ATP concentrations in a broad range of detection from 10 aM to 10 pM.Meanwhile,we achieved ultra-sensitive(LOD:10 aM)and quantitative(range from 10 aM to 100 fM)measurements of ATP in human serum.The 3D WG-FET also exhibits high specificity.This work may provide a novel approach to improve the sensitivity for the detection of ATP in complex biological matrix,showing a broad application value for early clinical diagnosis and food health monitoring.展开更多
The precise control of wrinkles and strain gradients in nanofilm is of significant interest due to their profound influence on electronic band structures and spin states.Here,we employ ultrafast electron diffraction(U...The precise control of wrinkles and strain gradients in nanofilm is of significant interest due to their profound influence on electronic band structures and spin states.Here,we employ ultrafast electron diffraction(UED)to study the picosecond-scale dynamics of laser-induced bending in 2H-MoTe2 thin films.展开更多
It is the morning of my 58th birthday as I write this.That actually means I have lived 58 full years here on Earth and am starting the first day of my 59th.That is a lot of kilometers under the hood.When I looked in m...It is the morning of my 58th birthday as I write this.That actually means I have lived 58 full years here on Earth and am starting the first day of my 59th.That is a lot of kilometers under the hood.When I looked in my mirror this morning,I could see the wear and tear on my body.My hair was sparse and silver.My skin was thin.My face was full of age spots.And my wrinkles were chiseled(刻)deep into my skin.Yet,when I smiled and I saw them curl up around my eyes and the corners of my mouth,I had to admit that they didnt look half bad.展开更多
基金support from the National Natural Science Foundation of China(No.52103299)the science foundation of national key laboratory of science and technology on advanced composites in special environments(No.6142905241301).
文摘The surface wrinkled structures of materials endow them with various properties,such as hydrophilicity/hydrophobicity,adhesion,large specific surface area,etc.,which have been applied in self-cleaning surfaces,strong adhesives,ultra-sensitive sensors,etc.However,traditional wrinkled surfaces with single wrinkled structures cannot meet the demand for intelligent regulation,making the widespread application rather challenging.Recently,stimuli-responsive wrinkled surfaces,which are capable of reversibly regulating wrinkled structures(amplitude,period,etc.),have been developed to broaden their applications.Here,an overview of stimuli-responsive wrinkled surfaces is provided.First,the mechanism and design principle of surface wrinkled structures based on film/substrate bilayer systems are comprehensively analyzed.Subsequently,the latest advancements in the preparation and application of stimuli-responsive wrinkled surfaces are presented from the perspective of types of external stimuli(light,temperature,pH,humidity,solvent,and strain).Finally,the current challenges and future prospects of the stimuli-responsive wrinkled surfaces are illustrated.This review provides some insights and valuable references for the rational design of stimuli-responsive wrinkled surfaces.
基金supported by the National Natural Science Foundation of China(Grant nos.52371247,91963205,62101352,61988102 and 12274424)the National Key Research and Development Program of China(Grant nos.2019YFA0210200,2019YFA0210203,2022YFA1203500,and 2022YFA1206600).
文摘With the increasing demand for terahertz(THz)technology in security inspection,medical imaging,and flexible electronics,there is a significant need for stretchable and transparent THz electromagnetic interference(EMI)shielding materials.Existing EMI shielding materials,like opaque metals and carbon-based films,face challenges in achieving both high transparency and high shielding efficiency(SE).Here,a wrinkled structure strategy was proposed to construct ultra-thin,stretchable,and transparent terahertz shielding MXene films,which possesses both isotropous wrinkles(height about 50 nm)and periodic wrinkles(height about 500 nm).Compared to flat film,the wrinkled MXene film(8 nm)demonstrates a remarkable 36.5%increase in SE within the THz band.The wrinkled MXene film exhibits an EMI SE of 21.1 dB at the thickness of 100 nm,and an average EMI SE/t of 700 dBμm^(−1)over the 0.1-10 THz.Theoretical calculations suggest that the wrinkled structure enhances the film’s conductivity and surface plasmon resonances,resulting in an improved THz wave absorption.Additionally,the wrinkled structure enhances the MXene films’stretchability and stability.After bending and stretching(at 30%strain)cycles,the average THz transmittance of the wrinkled film is only 0.5%and 2.4%,respectively.The outstanding performances of the wrinkled MXene film make it a promising THz electromagnetic shielding materials for future smart windows and wearable electronics.
基金financially supported by the National Natural Science Foundation of China(52073302,52103311)Hunan Provincial Natural Science Foundation for Distinguished Young Scholars(No.14JJ1001).
文摘Nowadays,the increasing electromagnetic waves generated by wearable devices are becoming an emerging issue for human health,so stretchable electromagnetic interference(EMI)shielding materials are highly demanded.Elephant trunks are capable of grabbing fragile vegetation and tearing trees thanks not only to their muscles but also to their folded skins.Inspired by the wrinkled skin of the elephant trunks,herein,we propose a winkled conductive film based on single-walled carbon nanotubes(SWCNTs)for multifunctional EMI applications.The conductive film has a sandwich structure,which was prepared by coating SWCNTs on both sides of the stretched elastic latex cylindrical substrate.The shrinking-induced winkled conductive network could withstand up to 200%tensile strain.Typically,when the stretching direction is parallel to the polarization direction of the electric field,the total EMI shielding effectiveness could surprisingly increase from 38.4 to 52.7 dB at 200%tensile strain.It is mainly contributed by the increased connection of the SWCNTs.In addition,the film also has good Joule heating performance at several voltages,capable of releasing pains in injured joints.This unique property makes it possible for strain-adjustable multifunctional EMI shielding and wearable thermotherapy applications.
基金supported by the National Natural Science Foundation of China(No.51972198)Shandong Provincial Science and Technology Key Project(No.2018GGX104002)+7 种基金Taishan Scholars Program of Shandong Province(No.tsqn201812002)Independent Innovation Foundation of Shandong Universitythe State Key Program of National Natural Science of China(Nos.61633015,51532005)the Young Scholars Program of Shandong University(No.2016WLJH03),the Project of the Taishan Scholar(No.ts201511004)Shandong Provincial Natural Science Foundation(No.ZR2017MB001)Discipline Construction of High-Level Talents of Shandong University(No.31370089963078)1000 Talent Plan program(No.31370086963030)the National Natural Science Foundation of China(No.21371108)。
文摘Available onlineSilicon monoxide(SiO)is a promising anode material fo r lithium-ion batteries(LIBs)due to its high theoretical specific capacity(~2400 mAh/g),low working potential(<0.5 V vs.Li^+/Li),low cost,easy synthesis,nontoxicity,abundant natural source and smaller volume expansion than Si.However,low intrinsic electrical conductivity,low initial Coulombic efficiency(ICE)and inevitable volume expansion(~200%)impede its practical application.Here we fabricate SiO/wrinkled MXene composite(SiO-WM)by an electrostatic self-assembly method.Importantly,this method is simple,scalable and taking into account all the issues of SiO.As a result,the SiO-WM exhibits imp roved rate capability,cycling performance and ICE than bare SiO.
基金the National Natural Science Foundation of China(No.21704084,21975206)the Shaanxi Innovative Talents Promotion Plan-the Young Star of Science and Technology Project(No.2019KJXX-67)。
文摘Nowadays,the employing of molecular imprinting technique in the analysis and separation of proteins from complex biological samples has been widely favored by researchers.To enrich the types of surface protein imprinted materials and expand the application fields of graphene materials,novel surface molecular imprinted polymers(MIPs)based on magnetic graphene microspheres Fe_(3)O_(4)@r GO@MIPs are first synthesized in this paper.Fe_(3)O_(4)@r GO@MIPs are prepared by oxidative self-polymerization of dopamine on the surface of magnetic graphene(Fe_(3)O_(4)@r GO)composite microspheres.Bovine serum albumin(BSA)is selected as protein template.Fe_(3)O_(4)@r GO microspheres with wrinkled flower-like structure are obtained by compounding Fe_(3)O_(4)and graphene oxide in an appropriate ratio via the method of high-temperature reduction self-assembly.The microspheres exhibit promising dispersibility,high external surface area,rich pore structure,and sufficient magnetic properties.These advantages not only prevent the agglomeration of imprinted microspheres in the aqueous phase,which is conducive to contact and static adsorption,but also increase the amount of protein imprinting.Additionally,sufficient magnetic properties ensure fast and effective separation of the adsorbents.While the adsorption capacity is increased,the separation procedure becomes simple.The binding capacity of Fe_(3)O_(4)@r GO@MIPs for BSA can reach 317.58 mg/g within 60 min,and the imprinting factor(IF)is 4.24.More importantly,Fe_(3)O_(4)@r GO@MIPs can specifically recognize the target BSA from the mixed proteins and the actual sample.There is no significant decrease in the adsorption amount,IF,and magnetic properties after eight runs.It is promising to be used in the separation of proteins from the actual biological samples.
基金supported by the National Basic Research Program of China(No.2013CB934001)the National Natural Science Foundation of China(No.51572238)+2 种基金the Zhejiang Provincial Natural Science Foundation of China under Grant No.LY15E010004the Fundamental Research Funds for the Central Universities(No.2016XZZX005-07)the Program for Innovative Research Team in University of Ministry of Education of China(No.IRT13037)
文摘Sodium-ion batteries（SIBs） recently have received a worldwide attention due to the resource abundance of sodium and similar battery chemistry with lithium-ion batteries（LIBs）. However, search for suitable anodes for SIBs still remains a challenge since graphitized carbon, the anode for commercial LIBs, usually exhibits low electrochemical Na-storage activity. In this work, a unique graphene-reinforced Ni3S2 thin film（Ni3S2/G） has been constructed and investigated as a promising anode for SIBs. The Ni3S2 thin film has a thickness of 200–300 nm and is composed of small sized crystals of around 100 nm. The graphene has a wrinkled surface profile which offers three-dimensional networks for electron conductivity and structural reinforcement. The Ni3S2/G thin film exhibits high capacity, excellent cycling stability and good rate capability due to the introduction of wrinkled graphene. Ni3S2/G can deliver a high initial capacity of 791 m Ah g-1at 50 m A g-1. The capacity can be maintained at 563 m Ah g-1after 110 cycles.This work provides a unique design for high-performance SIBs anodes.
文摘Terahertz radiation (THzR) consists of electromagnetic waves within the band of frequencies from 0.3 to 3 terahertz with the wavelengths of radiation in the range from 0.1 mm to 1 mm, respectively. The technology for generating and manipulating THzR is still in its initial stage. Herein, we demonstrate that the wrinkled Si1–xGex/Si1–yGey films can be used as radiation sources, which emit electromagnetic waves (EMW) in a very wide range of the frequencies including the terahertz band from 0.3 to 3 THz and far IR from 3 THz to 20 THz. These findings provide the theoretical foundation for the wrinkled nanofilm radiation emission and may allow, to some extent, to fill the terahertz gap.
基金This project was financially supported by the Research Grants Council(GRF Projects:16229216,16209917,16205517)the Innovation and Technology Commission(ITS/012/19)of Hong Kong SAR.
文摘Flexible multidirectional strain sensors are crucial to accurately determining the complex strain states involved in emerging sensing applications.Although considerable efforts have been made to construct anisotropic structures for improved selective sensing capabilities,existing anisotropic sensors suffer from a trade-off between high sensitivity and high stretchability with acceptable linearity.Here,an ultrasensitive,highly selective multidirectional sensor is developed by rational design of functionally different anisotropic layers.The bilayer sensor consists of an aligned carbon nanotube(CNT)array assembled on top of a periodically wrinkled and cracked CNT-graphene oxide film.The transversely aligned CNT layer bridge the underlying longitudinal microcracks to effectively discourage their propagation even when highly stretched,leading to superior sensitivity with a gauge factor of 287.6 across a broad linear working range of up to 100%strain.The wrinkles generated through a pre-straining/releasing routine in the direction transverse to CNT alignment is responsible for exceptional selectivity of 6.3,to the benefit of accurate detection of loading directions by the multidirectional sensor.This work proposes a unique approach to leveraging the inherent merits of two cross-influential anisotropic structures to resolve the trade-off among sensitivity,selectivity,and stretchability,demonstrating promising applications in full-range,multi-axis human motion detection for wearable electronics and smart robotics.
基金Sponsored by the Development Program for Outstanding Young Teachers in Harbin Institute of Technology(Grant No.HITQNJS.2008.004)the China Postdoctoral Science Foundation (Grant No.20070420163)Special Fund for Innovation Talents of Science and Technology in Harbin(Grant No.2008RFQXG057)
文摘The axisymmetric deformation of a paraboloidal membrane inflatable structure subjected to a concentrated load at its apex and a uniform internal pressure was analyzed. The wrinkle angle was obtained according to the membrane theory when wrinkles appeared and determined the wrinkle region. The wrinkled deformation was obtained based on the relaxed energy function. The effects of inflation pressure and concentrated loads on the wrinkle angle were analyzed and the deformation was obtained at the apex of structure. According to the numerical analysis, the shape of deformed meridians with wrinkles was obtained.
基金Project(020940) supported by the Natural Science Foundation of Guangdong Province,China
文摘To solve the problems of divergence,low accuracy and project application of membrane wrinkling analysis,an analysis method of zero shear modulus and equivalent stiffness was proposed.This method is an improvement to the previous method (Method I) of local coordinate transposition and stiffness equivalence.The new method is derived and the feasibility is theoretically proved.A small-scale membrane structure is analyzed by the two methods,and the results show that the computational efficiency of the new method (Method II) is approximately 23 times that of Method I.When Method II is applied to a large-scale membrane stadium structure,it is found that this new method can quickly make the second principal stress of one way wrinkled elements zero,and make the two principal stresses of two-way wrinkled elements zero as well.It could attain the correct load responses right after the appearance of wrinkled elements,which indicates that Method II can be applied to wrinkling analysis of large-scale membrane structures.
基金supported by the National Natural Science Foundation of China(grant number 12362026 and 11862017).
文摘Dragonflies are highly skilled flyers in the natural world,capable of performing flight maneuvers such as lateral flight,hovering,and backward flight—many of which are difficult for human aircraft to achieve.The exceptional flight abilities of dragonflies are closely related to their wings.The wrinkled and venous structures on their wings provide aerodynamic advantages that flat wings with equal thickness,equal projected area,and identical shape profiles do not possess.At the same time,dragonfly wings have a certain degree of flexibility,which causes deformation under aerodynamic forces during flight.This deformation,in turn,affects the aerodynamic characteristics of the wings.To reveal the impact of the wing wrinkling and flexibility on the aerodynamic properties,this study established a three-dimensional CFD model and CSD model of the dragonfly’s wrinkled forewing based on previous measurements and research results using 3D modeling software.Modal analysis was performed to verify the model’s accuracy.Using the CFD method and a CFD/CSD bidirectional fluid-structure coupling calculation method,numerical simulations were conducted on the aerodynamic characteristics of both rigid and flexible wrinkled forewings,as well as flat forewings with equal thickness,equal projected area,and identical shape profiles during gliding flight.The results showed that the stronger leading-edge vortex and the attached vortices within the wrinkled structure improve the aerodynamic performance of the dragonfly’s forewings.Additionally,for the wrinkled forewings,the flexibility factor causes the wing veins and membrane to deform under aerodynamic loads.The pressure difference between the upper and lower surfaces of the flexible forewing is reduced compared to the rigid forewing,leading to a decrease in both lift and drag.However,in terms of the final result,the aerodynamic performance of the dragonfly’s forewings is enhanced.
基金financially supported by the National Key Research and Development Program of China(No.2021YFC2104100)the National Natural Science Foundation of China(Nos.21901058,22178083 and 22078081)+2 种基金the S&T program of Hebei(Nos.21372805D,21372804D and 20372802D)the Natural Science Foundation of Tianjin City(No.20JCYBJC00530)the Natural Science Foundation of Hebei Province(No.B2022202014).
文摘Core-shell structured magnetic wrinkled organosilica-based metal-enzyme integrated catalysts were synthesized,and their catalytic performances were studied in the chemoenzymatic dynamic kinetic resolution of chiral amines in an organic solvent,as well as in the chemoenzymatic synthesis of chiral alcohols in water.Structureperformance studies revealed the important influence of their tunable structure and composition on the optimization of activity,stability,and recyclability in chemoenzymatic catalysis.
基金supported by the National Natural Science Foundation of China(61904143,12225208,32260244)Hainan Provincial Natural Science Foundation of China(524YXQN416,824CXTD424)Science and Technology Special Fund of Hainan Province(ZDYF2022SHFZ289).
文摘Wearable strain sensors(WSSs)have found widespread applications,where the key is to optimize their sensing and wearing performances.However,the intricate material designs for developing WSSs often rely on costly reagents and/or complex pro-cesses,which bring barriers to their large-scale production and use.Herein,a facile and affordable(material cost of<$0.002/cm2)method is presented for fabricating conductive bandage(CB)-based WSSs by electrospraying a carbon nanotube(CNT)layer on commercial self-adhesive bandages with excellent biosafety,stretchability,mechanical compliance,breathability and cost effectiveness.The wrinkled and fibrous structures of self-adhesive bandages were rationally leverage to control the geometry of CNT layer,thereby ensuring tunable mechanoelectrical sensitivities(gauge factors of 2~850)of CBs.Moreover,a strain-sensing mechanism directly mediated by the highly wrinkled microstructure is unveiled,which can work in synergy with a training-loosened-fibrous microstructure.The excellent performance of CBs for monitoring full-range strain signals in human bodies was further demonstrated.CBs would possess great potential for being developed into WSSs because of their outstanding cost-performance ratio.
基金supported by Natural Science and Engineering Research Council of Canada(RGPIN-2017-06737)Canada Research Chairs program,the National Key Research and Development Program of China(2017YFD0601005,2022YFD0904201)+1 种基金the National Natural Science Foundation of China(51203075)the China Scholarship Council(Grant No.CSC202208320361).
文摘With the rapid development of flexible wearable electronics,the demand for stretchable energy storage devices has surged.In this work,a novel gradient-layered architecture was design based on single-pore hollow lignin nanospheres(HLNPs)-intercalated two-dimensional transition metal carbide(Ti_(3)C_(2)T_(x) MXene)for fabricating highly stretchable and durable supercapacitors.By depositing and inserting HLNPs in the MXene layers with a bottom-up decreasing gradient,a multilayered porous MXene structure with smooth ion channels was constructed by reducing the overstacking of MXene lamella.Moreover,the micro-chamber architecture of thin-walled lignin nanospheres effectively extended the contact area between lignin and MXene to improve ion and electron accessibility,thus better utilizing the pseudocapacitive property of lignin.All these strategies effectively enhanced the capacitive performance of the electrodes.In addition,HLNPs,which acted as a protective phase for MXene layer,enhanced mechanical properties of the wrinkled stretchable electrodes by releasing stress through slip and deformation during the stretch-release cycling and greatly improved the structural integrity and capacitive stability of the electrodes.Flexible electrodes and symmetric flexible all-solid-state supercapacitors capable of enduring 600%uniaxial tensile strain were developed with high specific capacitances of 1273 mF cm^(−2)(241 F g^(−1))and 514 mF cm^(−2)(95 F g^(−1)),respectively.Moreover,their capacitances were well preserved after 1000 times of 600%stretch-release cycling.This study showcased new possibilities of incorporating biobased lignin nanospheres in energy storage devices to fabricate stretchable devices leveraging synergies among various two-dimensional nanomaterials.
基金financial support from the National Nature Science Foundation of China(No.52273247)the National Science and Technology Major Project of China(J2019-VI-0017-0132).
文摘Developing advanced stealth devices to cope with radar-infrared(IR)fusion detection and diverse application scenarios is increasingly demanded,which faces significant challenges due to conflicting microwave and IR cloaking mechanisms and functional integration limitations.Here,we propose a multiscale hierarchical structure design,integrating wrinkled MXene IR shielding layer and flexible Fe_(3)O_(4)@C/PDMS microwave absorption layer.The top wrinkled MXene layer induces the intensive diffuse reflection effect,shielding IR radiation signals while allowing microwave to pass through.Meanwhile,the permeable microwaves are assimilated into the bottom Fe_(3)O_(4)@C/PDMS layer via strong magneto-electric synergy.Through theoretical and experimental optimization,the assembled stealth devices realize a near-perfect stealth capability in both X-band(8–12 GHz)and long-wave infrared(8–14μm)wavelength ranges.Specifically,it delivers a radar cross-section reduction of−20 dB m^(2),a large apparent temperature modulation range(ΔT=70℃),and a low average IR emissivity of 0.35.Additionally,the optimal device demonstrates exceptional curved surface conformability,self-cleaning capability(contact angle≈129°),and abrasion resistance(recovery time≈5 s).This design strategy promotes the development of multispectral stealth technology and reinforces its applicability and durability in complex and hostile environments.
基金supported by the project of National Natural Science Foundation of China(No.21676275 and No.22078334).
文摘The present manuscript describes a facile and versatile method for preparing uniform wrinkled silica microspheres with diameters of tens of microns.The method comprises a one-pot emulsion/sol-gel method using silica precursors of organosilane and tetraethoxysilane.By controlling the sol-to-gel transition of the silica precursors,a series of silica microspheres based on uniform emulsion droplets was synthesized by membrane emulsification.The silica microspheres had a variety of surface morphologies ranging from smooth,maze-like wrinkles to polygon-like ravines.It was possible to alter the surface morphologies of the microspheres by controlling the amount of organosilane in the dispersed phase and the amount of ammonia catalyst in the continuous phase of the emulsion.The grooves on the wrinkled microspheres were able to trap polymer nanoparticles of matching size,thereby demonstrating the potential usefulness of the microspheres in separation science and drug delivery.
基金support from the National Natural Science Foundation of China(Nos.12274058 and 12104085)Taishan Scholars Program of Shandong Province(No.tsqn201812104)+2 种基金the Natural Science Foundation of Shandong Province(No.ZR2021QA008)the Qingchuang Science and Technology Plan of Shandong Province(No.2019KJJ017)the project of the Talent Introduction of Dezhou University(No.2021xjrc101).
文摘Adenosine triphosphate(ATP)is closely related to the pathogenesis of certain diseases,so the detection of trace ATP is of great significance to disease diagnosis and drug development.Graphene field-effect transistors(GFETs)have been proven to be a promising platform for the rapid and accurate detection of small molecules,while the Debye shielding limits the sensitive detection in real samples.Here,a three-dimensional wrinkled graphene field-effect transistor(3D WG-FET)biosensor for ultra-sensitive detection of ATP is demonstrated.The lowest detection limit of 3D WG-FET for analyzing ATP is down to 3.01 aM,which is much lower than the reported results.In addition,the 3D WG-FET biosensor shows a good linear electrical response to ATP concentrations in a broad range of detection from 10 aM to 10 pM.Meanwhile,we achieved ultra-sensitive(LOD:10 aM)and quantitative(range from 10 aM to 100 fM)measurements of ATP in human serum.The 3D WG-FET also exhibits high specificity.This work may provide a novel approach to improve the sensitivity for the detection of ATP in complex biological matrix,showing a broad application value for early clinical diagnosis and food health monitoring.
基金supported by the High-level Talent Research Start-up Project Funding of Henan Academy of Sciences(Project No.241827012)the National Natural Science Foundation of China(Grant Nos.U22A6005 and 62271450)+1 种基金the National Key Research and Development Program of China(Grant Nos.2021YFA1301502,2024YFA1408701,and 2024YFA1408403)the Synergetic Extreme Condition User Facility(SECUF,https://cstr.cn/31123.02.SECUF)。
文摘The precise control of wrinkles and strain gradients in nanofilm is of significant interest due to their profound influence on electronic band structures and spin states.Here,we employ ultrafast electron diffraction(UED)to study the picosecond-scale dynamics of laser-induced bending in 2H-MoTe2 thin films.
文摘It is the morning of my 58th birthday as I write this.That actually means I have lived 58 full years here on Earth and am starting the first day of my 59th.That is a lot of kilometers under the hood.When I looked in my mirror this morning,I could see the wear and tear on my body.My hair was sparse and silver.My skin was thin.My face was full of age spots.And my wrinkles were chiseled(刻)deep into my skin.Yet,when I smiled and I saw them curl up around my eyes and the corners of my mouth,I had to admit that they didnt look half bad.
