In the present work,by virtue of the synergistic and independent effects of Janus structure,an asymmetric nickel-chain/multiwall carbon nanotube/polyimide(Ni/MWCNTs/PI)composite foam with absorption-dominated electrom...In the present work,by virtue of the synergistic and independent effects of Janus structure,an asymmetric nickel-chain/multiwall carbon nanotube/polyimide(Ni/MWCNTs/PI)composite foam with absorption-dominated electromagnetic interference(EMI)shielding and thermal insulation performances was successfully fabricated through an ordered casting and directional freeze-drying strategy.Water-soluble polyamic acid(PAA)was chosen to match the oriented freeze-drying method to acquire oriented pores,and the thermal imidization process from PAA to PI exactly eliminated the interface of the multilayered structure.By controlling the electro-magnetic gradient and propagation path of the incident microwaves in the MWCNT/PI and Ni/PI layers,the PI composite foam exhibited an efficient EMI SE of 55.8 dB in the X-band with extremely low reflection characteristics(R=0.22).The asymmetric conductive net-work also greatly preserved the thermal insulation properties of PI.The thermal conductivity(TC)of the Ni/MWCNT/PI composite foam was as low as 0.032 W/(m K).In addition,owing to the elimination of MWCNT/PI and Ni/PI interfaces during the thermal imidization process,the composite foam showed satisfactory compressive strength.The fabricated PI composite foam could provide reliable electromagnetic protection in complex applications and withstand high temperatures,which has great potential in cuttingedge applications such as advanced aircraft.展开更多
Flexible multifunctional polymer-based electromagnetic interference(EMI)shielding composite films play a pivotal role in 5 G communication technology,smart wearables,automotive electronics,and aerospace.In this work,(...Flexible multifunctional polymer-based electromagnetic interference(EMI)shielding composite films play a pivotal role in 5 G communication technology,smart wearables,automotive electronics,and aerospace.In this work,(Ti_(3)C_(2)T_(x) MXene/cellulose nanofibers(CNF)-(hydroxy‑functionalized BNNS(BNNS-OH)/CNF)composite films(TBCF)with Janus structure are prepared via vacuum-assisted filtration of BNNS-OH/CNF and Ti_(3)C_(2)T_(x)/CNF suspension by one after another.Then ionic bonding-strengthened TBCF(ITBCF)is obtained by Ca^(2+)ion infiltration and cold-pressing technique.The Janus structure endows ITBCF with the unique“conductive on one side and insulating on the other”property.When the mass ratio of Ti_(3)C_(2)T_(x) and BNNS is 1:1 and the total mass fraction is 70 wt.%,the electrical conductivity(σ)of the Ti_(3)C_(2)T_(x)/CNF side of ITBCF reaches 166.7 S/cm,while the surface resistivity of the BNNS-OH/CNF side is as high as 304 MΩ.After Ca^(2+)ion infiltration,the mechanical properties of ITBCF are significantly enhanced.The tensile strength and modulus of ITBCF are 73.5 MPa and 15.6 GPa,which are increased by 75.9%and 46.2%compared with those of TBCF,respectively.Moreover,ITBCF exhibits outstanding EMI shielding effectiveness(SE)of 57 dB and thermal conductivity(λ)of 9.49 W/(m K).In addition,ITBCF also presents excellent photothermal and photoelectric energy conversion performance.Under simulated solar irradiation with a power density of 120 mW/cm^(2),the surface stabilization temperature reaches up to 65.3°C and the maximum steady state voltage reaches up to 58.2 mV.展开更多
Switchable radiative cooling/heating holds great promise for mitigating the global energy and environmental crisis.Here,we reported a cost-effective,high-strength Janus film through surface optical engineering waste p...Switchable radiative cooling/heating holds great promise for mitigating the global energy and environmental crisis.Here,we reported a cost-effective,high-strength Janus film through surface optical engineering waste paper with one side decorated by a hydrophobic polymeric cooling coating consisting of micro/nanopore/particle hierarchical structure and the other side coated with hydrophilic MXene nanosheets for heating.The cooling surface demonstrates high solar reflectivity(96.3%)and infrared emissivity(95.5%),resulting in daytime/nighttime sub-ambient radiative cooling of 6℃/8℃with the theoretical cooling power of 100.6 and 138.5Wm^(−2),respectively.The heating surface exhibits high solar absorptivity(83.7%)and low infrared emissivity(15.2%),resulting in excellent radiative heating capacity for vehicle charging pile(~6.2℃)and solar heating performance.Impressively,the mechanical strength of Janus film increased greatly by 563%compared with that of pristine waste paper,which is helpful for its practical applications in various scenarios for switchable radiative thermal management through mechanical flipping.Energy-saving simulation results reveal that significant total energy savings of up to 32.4MJm^(−2) can be achieved annually(corresponding to the 12.4%saving ratio),showing the immense importance of reducing carbon footprint and promoting carbon neutrality.展开更多
声学多普勒流速剖面仪(Acoustic Doppler Current Profiler,ADCP)是目前海洋、江河流速测量的最主要仪器之一。已有对于ADCP的安装偏差分析大多是针对其安装在船上后,基阵发生偏移的安装偏差。针对5个超声换能器集成为五波束Janus结构A...声学多普勒流速剖面仪(Acoustic Doppler Current Profiler,ADCP)是目前海洋、江河流速测量的最主要仪器之一。已有对于ADCP的安装偏差分析大多是针对其安装在船上后,基阵发生偏移的安装偏差。针对5个超声换能器集成为五波束Janus结构ADCP后,由于机械加工、安装工艺造成的安装偏差,提出将安装偏差分为安装位置偏差和安装角度偏差两部分进行研究。证明了在100 m探测距离内,毫米级安装位置偏差等效于10^(-3)~10^(-2)度级安装角度偏差,得出了安装角度偏差是安装偏差中最主要部分的结论。设计了基于回波延时测距搭配高精度姿态仪的安装偏差校准方法,并通过仿真分析了校准过程中不同因素对校准精度的影响,以针对不同校准精度需求选取不同的校准环境。结果表明该校准方法有一定实用价值,可以用来对超声换能器集成为五波束Janus结构后的安装偏差进行校准。展开更多
Several natural organism can change shape under external stimuli. These natural phenomena have inspired a vast amount of research on exploration and implementation of reconfigurable shape transformation. The Janus str...Several natural organism can change shape under external stimuli. These natural phenomena have inspired a vast amount of research on exploration and implementation of reconfigurable shape transformation. The Janus structure is a promising approach to achieve shape transformation based on its heterogeneous chemical or physical properties on opposite sides.However, the heterogeneity is generally realized by multi-step processing, different materials,and/or different processing parameters. Here, we present a simple and flexible method of producing p H-sensitive Janus microactuators from a single material, using the same laser printing parameters. These microactuators exhibit reversible structural deformations with large bending angles of ~31°and fast response(~0.2 s) by changing the p H value of the aqueous environment. Benefited from the high flexibility of the laser printing technique and the spatial arrangements, pillar heights, and bending directions of microactuators are readily controlled,enabling a variety of switchable ordered patterns and complex petal-like structures on flat surfaces and inside microchannels. Finally, we explore the potential applications of this method in information encryption/decryption and microtarget capturing.展开更多
Quasi-solid electrolytes(QSEs)based on nanoporous materials are promising candidates to construct high-performance Limetal batteries(LMBs).However,simultaneously boosting the ionic conductivity(σ)and lithium-ion tran...Quasi-solid electrolytes(QSEs)based on nanoporous materials are promising candidates to construct high-performance Limetal batteries(LMBs).However,simultaneously boosting the ionic conductivity(σ)and lithium-ion transference number(t^(+)) of liquid electrolyte confined in porous matrix remains challenging.Herein,we report a novel Janus MOFLi/MSLi QSEs with asymmetric porous structure to inherit the benefits of both mesoporous and microporous hosts.This Janus QSE composed of mesoporous silica and microporous MOF exhibits a neat Li^(+) conductivity of 1.5.10^(–4)S cm^(−1) with t^(+) of 0.71.A partially de-solvated structure and preference distribution of Li^(+)near the Lewis base O atoms were depicted by MD simulations.Meanwhile,the nanoporous structure enabled efficient ion flux regulation,promoting the homogenous deposition of Li^(+).When incorporated in Li||Cu cells,the MOFLi/MSLi QSEs demonstrated a high Coulombic efficiency of 98.1%,surpassing that of liquid electrolytes(96.3%).Additionally,NCM 622||Li batteries equipped with MOFLi/MSLi QSEs exhibited promising rate performance and could operate stably for over 200 cycles at 1 C.These results highlight the potential of Janus MOFLi/MSLi QSEs as promising candidates for next-generation LMBs.展开更多
The accurate delivery of nanoparticles and organic small molecule drugs remains a serious challenge in nanoparticle-based tumor therapy.Dual-targeted therapy combining tumor cell targeting and organelle targeting is a...The accurate delivery of nanoparticles and organic small molecule drugs remains a serious challenge in nanoparticle-based tumor therapy.Dual-targeted therapy combining tumor cell targeting and organelle targeting is an effective solution.Here,an anticancer nanoformulation accurate delivery system was prepared using hyaluronic acid (HA) targeting CD44 receptors on the surface of tumor cells and IR780iodine (IR780) targeting mitochondrial for delivery.The system is based on an ultra-small Janus structured inorganic sensitizer TiO_(2-x)@NaGdF_(4) nanoparticles (TN NPs) prepared by one-step pyrolysis,further loaded with organic small molecule acoustic sensitizer IR780 and mitochondrial hexokinase Ⅱ inhibitor lonidamine (LND),followed by encapsulation of HA.Ultra-small size nanoparticles exhibit strong tissue penetration,tumor inhibition and in vivo metabolism.Under ultrasound radiation,TN NPs and IR780could produce a synergistic effect,effectively increased the efficiency of reactive oxygen species (ROS)production.Meanwhile,the released IR780 could smoothly target the mitochondria,and the ROS produced by IR780 can destroy the mitochondrial structure and disrupt the mitochondrial respiration.LND could inhibit the energy metabolism of tumor cells by reducing the activity of hexokinase Ⅱ (HK Ⅱ),which further accelerates the process of apoptosis.Furthermore,since the Janus structure allows the integration of multifunctional components into a single system,TN NPs can not only serve as an acoustic sensitizer to generate ROS,but the Gd element contained can also act as the nuclear magnetic resonance (MR)imaging contrast agent,suggesting that the nanoformulation can enable imaging-guided diagnosis and therapy.In conclusion,a new scheme to enhance sonodynamic therapy (SDT) and chemotherapy synergistically is proposed here based on ultra-small dual-targeted nanoformulation with Janus structure in the ultrasound radiation environment.展开更多
MXene-based composite films are regarded as up-and-coming multifunctional electromagnetic interference(EMI)shielding materials.However,the conflict between strong mechanical properties and high electrical conductivity...MXene-based composite films are regarded as up-and-coming multifunctional electromagnetic interference(EMI)shielding materials.However,the conflict between strong mechanical properties and high electrical conductivity hinders their application in modern integrated electronics.Herein,in virtue of density-induced sedimentation,robust and multifunctional liquid metals-reinforced cellulose nanofibers(CNF)/MXene(LMs-CNF/MXene)composite films with Janus structure are fabricated by one-step vacuum-assisted filtration method.Not only does the nacre-like structure of the CNF/MXene layer not destroy,but the deposited liquid metals(LMs)layer can serve as conductive potentiation.Due to the special Janus structure,an“absorption-reflection-reabsorption”shielding process is created in LMs-CNF/MXene composite film to strengthen EMI shielding performance.Its shielding effectiveness can reach 51.9 dB at -27μm,and the reflection coefficient falls to 0.89,below those of reported MXene-based shielding films.Meanwhile,the CNF/MXene layer can endow composite films with excellent mechanical properties with a super tensile strength of 110.3 MPa.Notably,the LMs-CNF/MXene EMI shielding composite films also integrate outstanding photo-/electrothermal conversion performances,which can effectively deice outdoors.The robust LMs-CNF/MXene EMI shielding composite films with satisfying photo-/electrothermal performances have extensive application prospects,such as aerospace,wearable electronics,and portable electronics.展开更多
Hierarchically three-dimensional(3D)materials present a pivotal challenge and opportunity in achieving effective microwave absorption with synergistic effects.In this work,α-Fe_(2)O_(3)@ZrO_(2)with core-shell structu...Hierarchically three-dimensional(3D)materials present a pivotal challenge and opportunity in achieving effective microwave absorption with synergistic effects.In this work,α-Fe_(2)O_(3)@ZrO_(2)with core-shell structure were fabricated in-situ on aramid nanofibers by a solvothermal method.Following calcination,3D ZrO_(2)/Fe_(3)O_(4)/C nanocomposites with Janus structure have been successfully synthesized.By controlling the lattice match and mismatch in both processes,a core-shell structure ofα-Fe_(2)O_(3)@ZrO_(2)and Janus structure of ZrO_(2)/Fe_(3)O_(4)have been well-define performed.The composite material ZrO_(2)/Fe_(3)O_(4)/C-700 has a minimum reflection loss(RLmin)of−67.4 dB at a thickness of 2.0 mm.The effective absorption bandwidth(EAB)at a thickness of 2.4 mm is 6.0 GHz(11.0-17.0 GHz).This study provides a novel strategy for fabricating high-efficiency electromagnetic wave absorption materials with dual synergistic effects in nanosized scale.展开更多
Photoelectrochemical water splitting using solar energy,generating oxygen and hydrogen is one of the clean fuel production processes.Inspired by surface-dependent characteristics of Janus structures,a newly designed J...Photoelectrochemical water splitting using solar energy,generating oxygen and hydrogen is one of the clean fuel production processes.Inspired by surface-dependent characteristics of Janus structures,a newly designed Janus monolayer Silicon Phosphorous Arsenide(SiPAs)was analyzed with Density Functional Theory(DFT)methods.Hybrid exchange-correlation functional(HSE06)combined with Wannier90-based analysis for electronic and optical properties of SiPAs reveals that it can act as a photocatalyst.SiPAs show an indirect bandgap of 1.88 eV,absorbing visible light range is 350 to 500 nm.The phonon spectrum confirms dynamic stability.The exciton binding energy is computed with GW/BSE methods.The electronic band edge positions are at-5.75 and-4.43 eV,perfectly straddling the water redox potentials.Interestingly the strain application modifies the bandgap and also non-homogenously widens the absorption band.A novel range of photocatalyst designs with Group IV-V elements with great promise for water-splitting,photovoltaic,and narrow bandgap semiconductor(optoelectronics)applications may be feasible.展开更多
Moist-electric power generation is an emerging energy technology that collects energy from the environment and converts it into electrical energy through the interaction of moisture with materials.Although most of the...Moist-electric power generation is an emerging energy technology that collects energy from the environment and converts it into electrical energy through the interaction of moisture with materials.Although most of the moist-electric generators(MEGs)have achieved continuous breakthroughs in open-circuit voltage(V_(OC))and duration at present,it has been proven to be a challenge to maintain a continuous relatively high short-circuit current(ISC).Herein,electrospun nanofiber-based Janus heterogeneous film with both moisture absorption and moisture evaporation characteristics is prepared,and excellent power output performance MEGs have been fabricated by setting perforated electrode at each side respectively.Results have demonstrated the Janus nanofiber moist-electric generator(JFMEG)can generate a V_(OC)of 0.6 V with a continuous power generation time of up to 30 d and a maximum I_(SC)of about 44µA cm^(−2)at 95%relative humidity.In addition,the I_(SC)maintenance time above 10µA cm^(−2)is close to 40 h The integrated device can power commercial equipment and can be used for self-powered breath detection.Additionally,the self-powered field-effect transistor by JFMEG has been fabricated,demonstrating excellent output characteristics.The detailed working mechanism of JFMEG and the influencing factors of power generation performance are systematically analyzed,which can provide reference for the performance improvement of similar moist-electric devices.展开更多
基金supported by the Natural Science Foundation of Shanxi Province(Nos.20210302123015 and 20210302123035)the Opening Project of State Key Laboratory of Polymer Materials Engineering(Sichuan University)(No.sklpme2022-4-06)the Open Foundation of China-Belarus Belt and Road Joint Laboratory on Electromagnetic Environment Effect(No.ZBKF2022030301).
文摘In the present work,by virtue of the synergistic and independent effects of Janus structure,an asymmetric nickel-chain/multiwall carbon nanotube/polyimide(Ni/MWCNTs/PI)composite foam with absorption-dominated electromagnetic interference(EMI)shielding and thermal insulation performances was successfully fabricated through an ordered casting and directional freeze-drying strategy.Water-soluble polyamic acid(PAA)was chosen to match the oriented freeze-drying method to acquire oriented pores,and the thermal imidization process from PAA to PI exactly eliminated the interface of the multilayered structure.By controlling the electro-magnetic gradient and propagation path of the incident microwaves in the MWCNT/PI and Ni/PI layers,the PI composite foam exhibited an efficient EMI SE of 55.8 dB in the X-band with extremely low reflection characteristics(R=0.22).The asymmetric conductive net-work also greatly preserved the thermal insulation properties of PI.The thermal conductivity(TC)of the Ni/MWCNT/PI composite foam was as low as 0.032 W/(m K).In addition,owing to the elimination of MWCNT/PI and Ni/PI interfaces during the thermal imidization process,the composite foam showed satisfactory compressive strength.The fabricated PI composite foam could provide reliable electromagnetic protection in complex applications and withstand high temperatures,which has great potential in cuttingedge applications such as advanced aircraft.
基金financially supported by the National Natural Science Foundation of China(Nos.52303090,52403132,52403112,52473083)the Natural Science Basic Research Plan in Shaanxi Province of China(No.2023-JC-QN-0168,2024JC-TBZC-04)+6 种基金the Innovation Capability Support Plan of Shaanxi Province(No.2024ZC-KJXX-022)the Shaanxi Province Key Research and Development Plan Project(No.2023-YBGY-461)the Innovation Capability Support Program of Shaanxi(No.2024RS-CXTD-57)the Natural Science Foundation of Chongqing,China(No.2023NSCQ-MSX2547)the Youth Talent Promotion Project of Shaanxi Science and Technology Association(No.20240426)The Special Scientific Research Plan of Education Department of Shaanxi Province(No.23JK0376)the authors would also like to thank Shiyaniia lab for the sup-port of SEM and XPS tests.
文摘Flexible multifunctional polymer-based electromagnetic interference(EMI)shielding composite films play a pivotal role in 5 G communication technology,smart wearables,automotive electronics,and aerospace.In this work,(Ti_(3)C_(2)T_(x) MXene/cellulose nanofibers(CNF)-(hydroxy‑functionalized BNNS(BNNS-OH)/CNF)composite films(TBCF)with Janus structure are prepared via vacuum-assisted filtration of BNNS-OH/CNF and Ti_(3)C_(2)T_(x)/CNF suspension by one after another.Then ionic bonding-strengthened TBCF(ITBCF)is obtained by Ca^(2+)ion infiltration and cold-pressing technique.The Janus structure endows ITBCF with the unique“conductive on one side and insulating on the other”property.When the mass ratio of Ti_(3)C_(2)T_(x) and BNNS is 1:1 and the total mass fraction is 70 wt.%,the electrical conductivity(σ)of the Ti_(3)C_(2)T_(x)/CNF side of ITBCF reaches 166.7 S/cm,while the surface resistivity of the BNNS-OH/CNF side is as high as 304 MΩ.After Ca^(2+)ion infiltration,the mechanical properties of ITBCF are significantly enhanced.The tensile strength and modulus of ITBCF are 73.5 MPa and 15.6 GPa,which are increased by 75.9%and 46.2%compared with those of TBCF,respectively.Moreover,ITBCF exhibits outstanding EMI shielding effectiveness(SE)of 57 dB and thermal conductivity(λ)of 9.49 W/(m K).In addition,ITBCF also presents excellent photothermal and photoelectric energy conversion performance.Under simulated solar irradiation with a power density of 120 mW/cm^(2),the surface stabilization temperature reaches up to 65.3°C and the maximum steady state voltage reaches up to 58.2 mV.
基金National Natural Science Foundation of China,Grant/Award Number:52003248Henan Province Youth Health Science and Technology Innovation Talent Training Program,Grant/Award Number:YQRC2023007+1 种基金Henan Province Excellent Youth Science Fund,Grant/Award Number:242300421064Joint Fund Predominant Discipline Cultivation Project of Henan Province,Grant/Award Number:232301420036.
文摘Switchable radiative cooling/heating holds great promise for mitigating the global energy and environmental crisis.Here,we reported a cost-effective,high-strength Janus film through surface optical engineering waste paper with one side decorated by a hydrophobic polymeric cooling coating consisting of micro/nanopore/particle hierarchical structure and the other side coated with hydrophilic MXene nanosheets for heating.The cooling surface demonstrates high solar reflectivity(96.3%)and infrared emissivity(95.5%),resulting in daytime/nighttime sub-ambient radiative cooling of 6℃/8℃with the theoretical cooling power of 100.6 and 138.5Wm^(−2),respectively.The heating surface exhibits high solar absorptivity(83.7%)and low infrared emissivity(15.2%),resulting in excellent radiative heating capacity for vehicle charging pile(~6.2℃)and solar heating performance.Impressively,the mechanical strength of Janus film increased greatly by 563%compared with that of pristine waste paper,which is helpful for its practical applications in various scenarios for switchable radiative thermal management through mechanical flipping.Energy-saving simulation results reveal that significant total energy savings of up to 32.4MJm^(−2) can be achieved annually(corresponding to the 12.4%saving ratio),showing the immense importance of reducing carbon footprint and promoting carbon neutrality.
文摘声学多普勒流速剖面仪(Acoustic Doppler Current Profiler,ADCP)是目前海洋、江河流速测量的最主要仪器之一。已有对于ADCP的安装偏差分析大多是针对其安装在船上后,基阵发生偏移的安装偏差。针对5个超声换能器集成为五波束Janus结构ADCP后,由于机械加工、安装工艺造成的安装偏差,提出将安装偏差分为安装位置偏差和安装角度偏差两部分进行研究。证明了在100 m探测距离内,毫米级安装位置偏差等效于10^(-3)~10^(-2)度级安装角度偏差,得出了安装角度偏差是安装偏差中最主要部分的结论。设计了基于回波延时测距搭配高精度姿态仪的安装偏差校准方法,并通过仿真分析了校准过程中不同因素对校准精度的影响,以针对不同校准精度需求选取不同的校准环境。结果表明该校准方法有一定实用价值,可以用来对超声换能器集成为五波束Janus结构后的安装偏差进行校准。
基金the Hong Kong Scholar Program (XJ2018035) for their financial supportsupported by Research Grants Council of Hong Kong (No. JLFS/E-402/18)National Natural Science Foundation of China (No. 51805509)。
文摘Several natural organism can change shape under external stimuli. These natural phenomena have inspired a vast amount of research on exploration and implementation of reconfigurable shape transformation. The Janus structure is a promising approach to achieve shape transformation based on its heterogeneous chemical or physical properties on opposite sides.However, the heterogeneity is generally realized by multi-step processing, different materials,and/or different processing parameters. Here, we present a simple and flexible method of producing p H-sensitive Janus microactuators from a single material, using the same laser printing parameters. These microactuators exhibit reversible structural deformations with large bending angles of ~31°and fast response(~0.2 s) by changing the p H value of the aqueous environment. Benefited from the high flexibility of the laser printing technique and the spatial arrangements, pillar heights, and bending directions of microactuators are readily controlled,enabling a variety of switchable ordered patterns and complex petal-like structures on flat surfaces and inside microchannels. Finally, we explore the potential applications of this method in information encryption/decryption and microtarget capturing.
基金supported by National Natural Science Foundation of China(Grant No.22005266)Zhejiang Provincial Natural Science Foundation(Grant No.LR21E020003)“the Fundamental Research Funds for the Central Universities”(2021FZZX001-09).
文摘Quasi-solid electrolytes(QSEs)based on nanoporous materials are promising candidates to construct high-performance Limetal batteries(LMBs).However,simultaneously boosting the ionic conductivity(σ)and lithium-ion transference number(t^(+)) of liquid electrolyte confined in porous matrix remains challenging.Herein,we report a novel Janus MOFLi/MSLi QSEs with asymmetric porous structure to inherit the benefits of both mesoporous and microporous hosts.This Janus QSE composed of mesoporous silica and microporous MOF exhibits a neat Li^(+) conductivity of 1.5.10^(–4)S cm^(−1) with t^(+) of 0.71.A partially de-solvated structure and preference distribution of Li^(+)near the Lewis base O atoms were depicted by MD simulations.Meanwhile,the nanoporous structure enabled efficient ion flux regulation,promoting the homogenous deposition of Li^(+).When incorporated in Li||Cu cells,the MOFLi/MSLi QSEs demonstrated a high Coulombic efficiency of 98.1%,surpassing that of liquid electrolytes(96.3%).Additionally,NCM 622||Li batteries equipped with MOFLi/MSLi QSEs exhibited promising rate performance and could operate stably for over 200 cycles at 1 C.These results highlight the potential of Janus MOFLi/MSLi QSEs as promising candidates for next-generation LMBs.
基金financially supported by the National Natural Science Foundation of China (Nos. 52250077, 52272156, 51872263 and 52202175)Taishan Scholars Project (No. ts20190911)+1 种基金Shandong Natural Science Foundation (No. ZR2020ZD36)Guangdong Basic and Applied Basic Research Foundation (No. 2022A1515010461)。
文摘The accurate delivery of nanoparticles and organic small molecule drugs remains a serious challenge in nanoparticle-based tumor therapy.Dual-targeted therapy combining tumor cell targeting and organelle targeting is an effective solution.Here,an anticancer nanoformulation accurate delivery system was prepared using hyaluronic acid (HA) targeting CD44 receptors on the surface of tumor cells and IR780iodine (IR780) targeting mitochondrial for delivery.The system is based on an ultra-small Janus structured inorganic sensitizer TiO_(2-x)@NaGdF_(4) nanoparticles (TN NPs) prepared by one-step pyrolysis,further loaded with organic small molecule acoustic sensitizer IR780 and mitochondrial hexokinase Ⅱ inhibitor lonidamine (LND),followed by encapsulation of HA.Ultra-small size nanoparticles exhibit strong tissue penetration,tumor inhibition and in vivo metabolism.Under ultrasound radiation,TN NPs and IR780could produce a synergistic effect,effectively increased the efficiency of reactive oxygen species (ROS)production.Meanwhile,the released IR780 could smoothly target the mitochondria,and the ROS produced by IR780 can destroy the mitochondrial structure and disrupt the mitochondrial respiration.LND could inhibit the energy metabolism of tumor cells by reducing the activity of hexokinase Ⅱ (HK Ⅱ),which further accelerates the process of apoptosis.Furthermore,since the Janus structure allows the integration of multifunctional components into a single system,TN NPs can not only serve as an acoustic sensitizer to generate ROS,but the Gd element contained can also act as the nuclear magnetic resonance (MR)imaging contrast agent,suggesting that the nanoformulation can enable imaging-guided diagnosis and therapy.In conclusion,a new scheme to enhance sonodynamic therapy (SDT) and chemotherapy synergistically is proposed here based on ultra-small dual-targeted nanoformulation with Janus structure in the ultrasound radiation environment.
基金the support and funding from the National Natural Science Foundation of China(Nos.52203145,12204383)the Young Talent Fund of Association for Science and Technology in Shaanxi China(No.20230428)+1 种基金the Qinchuangyuan Citing High-level Innovation and Entrepreneurship Talent Projects(No.QCYRCXM-2022-190)the Key Research and Development Program of Shaanxi Province(No.2021SF-296).
文摘MXene-based composite films are regarded as up-and-coming multifunctional electromagnetic interference(EMI)shielding materials.However,the conflict between strong mechanical properties and high electrical conductivity hinders their application in modern integrated electronics.Herein,in virtue of density-induced sedimentation,robust and multifunctional liquid metals-reinforced cellulose nanofibers(CNF)/MXene(LMs-CNF/MXene)composite films with Janus structure are fabricated by one-step vacuum-assisted filtration method.Not only does the nacre-like structure of the CNF/MXene layer not destroy,but the deposited liquid metals(LMs)layer can serve as conductive potentiation.Due to the special Janus structure,an“absorption-reflection-reabsorption”shielding process is created in LMs-CNF/MXene composite film to strengthen EMI shielding performance.Its shielding effectiveness can reach 51.9 dB at -27μm,and the reflection coefficient falls to 0.89,below those of reported MXene-based shielding films.Meanwhile,the CNF/MXene layer can endow composite films with excellent mechanical properties with a super tensile strength of 110.3 MPa.Notably,the LMs-CNF/MXene EMI shielding composite films also integrate outstanding photo-/electrothermal conversion performances,which can effectively deice outdoors.The robust LMs-CNF/MXene EMI shielding composite films with satisfying photo-/electrothermal performances have extensive application prospects,such as aerospace,wearable electronics,and portable electronics.
基金supported by the National Natural Science Foundation of China(No.51873004)。
文摘Hierarchically three-dimensional(3D)materials present a pivotal challenge and opportunity in achieving effective microwave absorption with synergistic effects.In this work,α-Fe_(2)O_(3)@ZrO_(2)with core-shell structure were fabricated in-situ on aramid nanofibers by a solvothermal method.Following calcination,3D ZrO_(2)/Fe_(3)O_(4)/C nanocomposites with Janus structure have been successfully synthesized.By controlling the lattice match and mismatch in both processes,a core-shell structure ofα-Fe_(2)O_(3)@ZrO_(2)and Janus structure of ZrO_(2)/Fe_(3)O_(4)have been well-define performed.The composite material ZrO_(2)/Fe_(3)O_(4)/C-700 has a minimum reflection loss(RLmin)of−67.4 dB at a thickness of 2.0 mm.The effective absorption bandwidth(EAB)at a thickness of 2.4 mm is 6.0 GHz(11.0-17.0 GHz).This study provides a novel strategy for fabricating high-efficiency electromagnetic wave absorption materials with dual synergistic effects in nanosized scale.
基金the financial support for conducting part of the computational work,by the Australian Government through the Australian Research Council(ARC)under the centre of Excellence scheme(Project No.CE170100026)National Computational Infrastructure(NCI),a National Facility for computing resources.S K M also acknowledges the computing system resources’support from the University of Tsukuba,Japan through the International Postdoctoral Fellowship of Japan Society for the Promotion of Science(JSPS)’s KAKENHI(Grant No.JP22F32733)+1 种基金during the computational work and finalization of this studyS K M also acknowledges the support of Mr Matta Sai Aneesh,University of Queensland,Australia while preparing the graphical abstract.
文摘Photoelectrochemical water splitting using solar energy,generating oxygen and hydrogen is one of the clean fuel production processes.Inspired by surface-dependent characteristics of Janus structures,a newly designed Janus monolayer Silicon Phosphorous Arsenide(SiPAs)was analyzed with Density Functional Theory(DFT)methods.Hybrid exchange-correlation functional(HSE06)combined with Wannier90-based analysis for electronic and optical properties of SiPAs reveals that it can act as a photocatalyst.SiPAs show an indirect bandgap of 1.88 eV,absorbing visible light range is 350 to 500 nm.The phonon spectrum confirms dynamic stability.The exciton binding energy is computed with GW/BSE methods.The electronic band edge positions are at-5.75 and-4.43 eV,perfectly straddling the water redox potentials.Interestingly the strain application modifies the bandgap and also non-homogenously widens the absorption band.A novel range of photocatalyst designs with Group IV-V elements with great promise for water-splitting,photovoltaic,and narrow bandgap semiconductor(optoelectronics)applications may be feasible.
基金financially supported by the National Natural Science Foundation of China(Nos.11774001 and 52202156)the Scientific Research Project of Colleges and Universities in Anhui Province(No.2022AH050113)+2 种基金the University Synergy Innovation Program of Anhui Province(No.GXXT-2022-012)the China Postdoctoral Science Foundation(No.2024M760010)the Postdoctoral Daily Public Start-up Funds of Anhui University(No.S202418001/069).
文摘Moist-electric power generation is an emerging energy technology that collects energy from the environment and converts it into electrical energy through the interaction of moisture with materials.Although most of the moist-electric generators(MEGs)have achieved continuous breakthroughs in open-circuit voltage(V_(OC))and duration at present,it has been proven to be a challenge to maintain a continuous relatively high short-circuit current(ISC).Herein,electrospun nanofiber-based Janus heterogeneous film with both moisture absorption and moisture evaporation characteristics is prepared,and excellent power output performance MEGs have been fabricated by setting perforated electrode at each side respectively.Results have demonstrated the Janus nanofiber moist-electric generator(JFMEG)can generate a V_(OC)of 0.6 V with a continuous power generation time of up to 30 d and a maximum I_(SC)of about 44µA cm^(−2)at 95%relative humidity.In addition,the I_(SC)maintenance time above 10µA cm^(−2)is close to 40 h The integrated device can power commercial equipment and can be used for self-powered breath detection.Additionally,the self-powered field-effect transistor by JFMEG has been fabricated,demonstrating excellent output characteristics.The detailed working mechanism of JFMEG and the influencing factors of power generation performance are systematically analyzed,which can provide reference for the performance improvement of similar moist-electric devices.
