Circularly polarized luminescence perovskite nanocrystals(NCs)hold great potential in the field of information encryption,3D display and spintronics.However,the synthesis of the chiral perovskites is still confronted ...Circularly polarized luminescence perovskite nanocrystals(NCs)hold great potential in the field of information encryption,3D display and spintronics.However,the synthesis of the chiral perovskites is still confronted with various problems,such as cumbersome synthesis process,poor compatibility and limited processability,which impede their further implementation.In this study,a one-step wet-ball-milling method is proposed for the scale-up synthesis(up to 500 mL)of chiral perovskite ink,where the chiral molecule R-/S-1,2-diphenylethylenediamine(R-/S-DPEM)are introduced as chiral initiator.Chiral R-/S-DPEM molecules can endow the chirality to perovskite NCs through the strong coupling with perovskite surface.Specifically,ethyl cellulose is incorporated as passivating agents and structural supporting molecules,which can not only passivate the perovskite NCs and improve their stability,but also enable the chiral ink to possess better processability.The obtained ink is compatible with multiple substrates,which can be directly processed into various luminescent patterns by means of screen printing,writing,impregnation,laser engraving,etc.These patterns demonstrate high storage stability,flexibility and water resistance,fulfilling the requirements of a wide range of occasions in the future.This work provides a feasible solution for scalable synthesis of chiral perovskite inks,which offer promising prospects in optical anti-counterfeiting,information encryption and wearable optoelectronic devices.展开更多
Direct ink writing(DIW)holds enormous potential in fabricating multiscale and multi-functional architectures by virtue of its wide range of printable materials,simple operation,and ease of rapid prototyping.Although i...Direct ink writing(DIW)holds enormous potential in fabricating multiscale and multi-functional architectures by virtue of its wide range of printable materials,simple operation,and ease of rapid prototyping.Although it is well known that ink rheology and processing parameters have a direct impact on the resolution and shape of the printed objects,the underlying mechanisms of these key factors on the printability and quality of DIW technique remain poorly understood.To tackle this issue,we systematically analyzed the printability and quality through extrusion mechanism modeling and experimental validating.Hybrid non-Newtonian fluid inks were first prepared,and their rheological properties were measured.Then,finite element analysis of the whole DIW process was conducted to reveal the flow dynamics of these inks.The obtained optimal process parameters(ink rheology,applied pressure,printing speed,etc)were also validated by experiments where high-resolution(<100μm)patterns were fabricated rapidly(>70 mm s^(-1)).Finally,as a process research demonstration,we printed a series of microstructures and circuit systems with hybrid inks and silver inks,showing the suitability of the printable process parameters.This study provides a strong quantitative illustration of the use of DIW for the high-speed preparation of high-resolution,high-precision samples.展开更多
In order to solve the low efficiency and poor precision problems of traditional ink control methods on domestic offset printers,developing modern ink automatic control system has become more and more urgent.As an impo...In order to solve the low efficiency and poor precision problems of traditional ink control methods on domestic offset printers,developing modern ink automatic control system has become more and more urgent.As an important subsystem,the hu-man computer interface(HCI)is a key function for the wholly automatic control.Once this goal is obtained,all the printing pro-cedures especially the automatic control of ink volume should be finished with human computer interface in different areas.consid-ering the HCI design theory and structure characteristics of domestic printers comprehensively,the HCI prototype for automatic ink control system has been developed based on Visual Basic platform.As the individual ink key is instead of the integrated key,the di-vision result of ink fountain can be displayed on the interface.Through the interface,the dynamic adjusting functions such as mod-ifying ink volume,locking or unlocking each ink key and real-time displaying the adjusting results etc.can be completed.The sim-ulation test has shown that the opening and practical feature of the prototype is satisfactory.展开更多
ZTE Corporation has signed strategic telecommunications software agreement with two leading providers in Europe and Latin America to optimize its offerings for target customers in
As a novel 2D material,Ti_(3)C_(2)T_(x)-MXene has become a major area of interest in the field of microwave absorption(MA).However,the MA effect of common Ti_(3)C_(2)T_(x)-MXene is not prominent and often requires com...As a novel 2D material,Ti_(3)C_(2)T_(x)-MXene has become a major area of interest in the field of microwave absorption(MA).However,the MA effect of common Ti_(3)C_(2)T_(x)-MXene is not prominent and often requires complex processes or combinations of other ma-terials to achieve enhanced performance.In this context,a kind of gradient woodpile structure using common Ti_(3)C_(2)T_(x)-MXene as MA ma-terial was designed and manufactured through direct ink writing(DIW)3D printing.The minimum reflection loss(RL_(min))of the Ti_(3)C_(2)T_(x)-MXene-based gradient woodpile structures with a thickness of less than 3 mm can reach-70 dB,showing considerable improve-ment compared with that of a completely filled structure.In addition,the effective absorption bandwidth(EAB)reaches 7.73 GHz.This study demonstrates that a Ti_(3)C_(2)T_(x)-MXene material with excellent MA performance and tunable frequency band can be successfully fab-ricated with a macroscopic structural design and through DIW 3D printing without complex material hybridization and modification,of-fering broad application prospects by reducing electromagnetic wave radiation and interference.展开更多
Traditional p-type colloidal quantum dot(CQD)hole transport layers(HTLs)used in CQD solar cells(CQDSCs)are commonly based on organic ligands exchange and the layer-by-layer(LbL)technique.Nonetheless,the ligand detachm...Traditional p-type colloidal quantum dot(CQD)hole transport layers(HTLs)used in CQD solar cells(CQDSCs)are commonly based on organic ligands exchange and the layer-by-layer(LbL)technique.Nonetheless,the ligand detachment and complex fabrication process introduce surface defects,compromising device stability and efficiency.In this work,we propose a solution-phase ligand exchange(SPLE)method utilizing inorganic ligands to develop stable p-type lead sulfide(PbS)CQD inks for the first time.Various amounts of tin(Ⅱ)iodide(SnI_(2))were mixed with lead halide(PbX_(2);X=I,Br)in the ligand solution.By precisely controlling the SnI_(2)concentration,we regulate the transition of PbS QDs from n-type to p-type.PbS CQDSCs were fabricated using two different HTL approaches:one with 1,2-ethanedithiol(EDT)-passivated QDs via the LbL method(control)and another with inorganic ligand-passivated QD ink(target).The target devices achieved a higher power conversion efficiency(PCE)of 10.93%,compared to 9.83%for the control devices.This improvement is attributed to reduced interfacial defects and enhanced carrier mobility.The proposed technique offers an efficient pathway for producing stable p-type PbS CQD inks using inorganic ligands,paving the way for high-performance and flexible CQD-based optoelectronic devices.展开更多
Compared to subtractive manufacturing and casting,3D printing(additive manufacturing)offers advantages,such as the rapid production of complex structures,reduced material waste,and environmental friendliness.Direct in...Compared to subtractive manufacturing and casting,3D printing(additive manufacturing)offers advantages,such as the rapid production of complex structures,reduced material waste,and environmental friendliness.Direct ink writing(DIW)is one of the most popular 3D printing techniques owing to its ability to print multiple materials simultaneously and its high compatibility with printing inks.However,DIW presents significant challenges,particularly in the printing of high-performance polymers.The main challenges are as follows:1.The rigid structures and reaction kinetics of high-performance polymers make developing new inks difficult.2.The limited types of available high-performance polymers underscore the need for new DIW-suitable materials.3.Layer-by-layer stacking weakens interlayer bonding,affecting the mechanical properties of the printed product.4.The accuracy and speed of DIW printing are insufficient for large-scale manufacturing.After introducing the topic,the requirements for DIW printing inks are first reviewed,emphasizing the importance of thixotropic agents.Then,research progress regarding DIW printing of high-performance polymers is comprehensively reviewed according to the requirements of different polymer inks.Additionally,the applications of these materials across various fields are summarized.Finally,the challenges in DIW printing of high-performance polymers,along with corresponding solutions and future development prospects,are discussed in detail.展开更多
This study examines the development of painting techniques of Chinese ink wash landscape paintings,pays attention to its unique brush and ink language and features of the representation of elements,and deeply analyzes...This study examines the development of painting techniques of Chinese ink wash landscape paintings,pays attention to its unique brush and ink language and features of the representation of elements,and deeply analyzes the artistic characteristics of digital ink wash texture materials.The research focuses on key aspects such as the ink brushstrokes with the combination of emptiness and reality,the profound and serene ink wash space,and the extremely ingenious position layout.It proposes a construction path of digital ink wash texture materials based on the Blender material node system.This method makes use of the flexibility of the Blender material node system to successfully simulate highly realistic digital ink wash textures.It can not only construct static ink wash textures but also realize the dynamic transformation of static ink wash works through animation nodes and procedural control,thereby enhancing the artistic expression of digital ink wash works.The proposal and implementation of this method expand the application scope of the Blender material node system,help deeply explore the potential of digital ink wash art,and open up a brand new research path for constructing digital ink wash textures.展开更多
Flexible electronic technology has laid the foundation for complex human-computer interaction system,and has attracted great attention in the field of human motion detection and soft robotics.Graphene has received an ...Flexible electronic technology has laid the foundation for complex human-computer interaction system,and has attracted great attention in the field of human motion detection and soft robotics.Graphene has received an extensive attention due to its excellent electrical conductivity;however,how to use it to fabricate wearable flexible sensors with complex structures remains challenging.In this study,we studied the rheological behavior of graphene/polydimethylsiloxane ink and proposed an optimal graphene ratio,which makes the ink have an good printability and conductivity at the same time.Then,based on the theory of Peano fractal layout,we proposed a two-dimensional structure that can withstand multi-directional tension by replacing the traditional arris structure with the arc structure.After that,we manufactured circular arc fractal structure sensor by adjusting ink composition and printing structure through direct ink writing method.Finally,we evaluated the detection performance and repeatability of the sensor.This method provides a simple and effective solution for fabricating wearable flexible sensors and exhibits the potential to fabricate 3D complex flexible electronic devices.展开更多
This study systemmatically investigated the effects of solid content and dispersant content on the physicochemical properties of ZnO-SnO_(2) composite ink.The experimental results show that even with the use of low-mo...This study systemmatically investigated the effects of solid content and dispersant content on the physicochemical properties of ZnO-SnO_(2) composite ink.The experimental results show that even with the use of low-molecular-weight PEG400 dispersant,gas-sensitive ink with high solid content and good suspension stability can be obtained,which is advantageous for low-temperature film formation and can effectively prevent property changes and film crack of high-temperature-sintering-induced material.Under this condition,the ink at a 15wt%solid content and 2wt%-10wt%PEG400 has good film-forming ability and high adhesion strength on the micro-electromechanical system(MEMS)micro-hotplates.Especially,the MEMS sensor printed using the ink of 6wt%PEG400 shows highest sensitivity,favorable impact resistance,thermal shock resistance,and up to 8 years of service life.展开更多
Screen printing using metal particle pastes,the current photovoltaic industry metallization standard,provides fast and reliable metal grids for silicon solar cells.Recently,metal complex or reactive metal inks are att...Screen printing using metal particle pastes,the current photovoltaic industry metallization standard,provides fast and reliable metal grids for silicon solar cells.Recently,metal complex or reactive metal inks are attracting research interest due to their significantly low cost and higher performance compared to traditional nanoparticle silver pastes.In this work,we demonstrate,for the first time,screen-printed high-efficiency silicon heterojunction solar cells metallized by silver metal complex inks on industrial G1-size(158.75×158.75 mm^(2))wafers.展开更多
The polysaccharides from Sepia esculenta ink are potential candidates for biomedical applications due to their functional properties.In our study,a heteropolysaccharide,SE-1,isolated from Sepia esculenta ink,had a mol...The polysaccharides from Sepia esculenta ink are potential candidates for biomedical applications due to their functional properties.In our study,a heteropolysaccharide,SE-1,isolated from Sepia esculenta ink,had a molecular weight of 13.1 kDa and a monosaccharide composition of Man:GlcN:GlcUA:GalN:Xyl:Fuc=1.00:1.38:0.65:2.89:0.76:1.99.Through partial acid hydrolysis,me-thylation and one-and two-dimensional nuclear magnetic resonance(1D and 2D NMR)spectroscopic analyses,it is indicated that the structure of SE-1 consists of→4)-α-D-GlcpNAc-(1→,→4)-α-L-Fucp-(1→,→3)-α-D-GalpNAc-(1→,→2,6)-α-D-Manp-(1→and→3)-β-D-GlcpUA-(1→as the main chain and single terminalβ-D-Xylp-(1→,which links to O-2 of(1→2,6)-α-Manp,as the side chain.A new aminosugar-abundant heteropolysaccharide was isolated from S.esculenta ink for the first time.展开更多
Quantumdot inks(QDIs)represent an emerging functionalmaterial that integrates nanotechnology and fluid engineering,demonstrating significant application potential in flexible optoelectronics and high-color gamut displ...Quantumdot inks(QDIs)represent an emerging functionalmaterial that integrates nanotechnology and fluid engineering,demonstrating significant application potential in flexible optoelectronics and high-color gamut displays.Their wide applicability is due to a unique quantum confinement effect that enables precise spectral tunability and solution-processable properties.However,the complex fluid dynamics associated with QDIs at micro-/nano-scales severely limit the accuracy of inkjet printing and pattern deposition.This review systematically addresses recent advances in the hydrodynamics of QDIs,establishing scientific mechanisms and key technical breakthroughs from an interdisciplinary perspective.Current research has focused on three optimization directions:(1)regulating ligand structures to enhance colloidal stability,flow consistency,and anti-shear performance while mitigating nanoparticle aggregation;(2)incorporating low-viscosity or high-volatility solvents and surface tension modifiers to modify droplet dynamic characteristics and suppress the“coffee-ring”effect;(3)integrating advanced technologies such as electrohydrodynamic jetting and microfluidic targeted deposition to achieve submicron pattern resolution and high film uniformity,expanding adaptability in flexible electronics,biosensing,and anti-counterfeiting printing.A comparison of current technical routes and critical performance indicators has identified the dominant variables that influence QDI macroscopic/microscopic properties.A comprehensive analytical framework is presented which spans material structure,rheological behavior,manufacturing processes,and functional characteristics.Moreover,a proposed engineering‘structure–parameter–behavior–performance’serves to link core–shell structure,formulation parameters(e.g.,viscosity and surface tension),fluidic behavior(e.g.,shear thinning and Marangoni flow),and device performance(e.g.,resolution and photoluminescence efficiency).The findings provide theoretical support and decision-making guidance for the large-scale application and interdisciplinary expansion of QDIs.展开更多
To overcome reliance on molds and the difficulty of fabricating complex geometries with traditional C/C composites,direct ink writing(DIW)with UV/heat dual curing was employed to produce high-performance C/C composite...To overcome reliance on molds and the difficulty of fabricating complex geometries with traditional C/C composites,direct ink writing(DIW)with UV/heat dual curing was employed to produce high-performance C/C composites.The rheological properties of the composite inks were systematically analyzed to assess the effects of phenolic resin(PR)and carbon fiber(CF)content.Results show pronounced shear-thinning behavior and strong thixotropy-both essential for stable DIW.Additionally,UV/heat curing behavior was characterized to provide theoretical insights for optimizing curing parameters.Notably,CF addition is found to significantly attenuate UV light penetration compared to pure PR.As CF content increases,the critical UV irradiation energy rises sharply from 68.47 to 911.19 mJ/cm^(2),necessitating precise adjustments to curing parameters.Preforms were pyrolyzed in a carbon tube furnace to examine pore-formation characteristics,and chemical vapor infiltration(CVI)was applied to filling the resulting pores,yielding C/C composites with a flexural strength of 115.19 MPa.展开更多
Polyvinylidene fluoride/lead zirconate titanate(PVDF/PZT)composite films have been prepared by direct ink writing and the effect of PZT content on crystallization behavior and electrical properties of film were system...Polyvinylidene fluoride/lead zirconate titanate(PVDF/PZT)composite films have been prepared by direct ink writing and the effect of PZT content on crystallization behavior and electrical properties of film were systematically investigated.The composite films were characterized by scanning electron microscope(SEM),X-ray diffractometer(XRD),Flourier transform infrared spectroscope(FTIR)and differential scanning calorimeter(DSC).The results show that,surface modified PZT powder(PZT@PDA)is successfully coated by polydopamine(PDA),resulting in a large number of polar groups that interact with the-CF_(2)-groups in PVDF,inducing the generation of polarβphase due to hydrogen bonding formed in the interaction.Theβphase content in composite film increases with increasing PZT@PDA content,up to 28.09%as with 5 wt.%PZT@PDA.PZT@PDA plays a role of nucleating agent to promote the generation of polar phases in the film and also acts as an impurity hindering the growth of nuclei to reduce crystallinity.Moreover,the presence of PZT@PDA in interfaces provides more sites for the occurrence of interfacial polarization and thus improving the electrical properties of films.The composite film with 5 wt.%PZT@PDA possesses the highest dielectric constant(8.61)and residual polarization value(0.6803μC/cm^(2)).展开更多
High-temperature thin-film strain sensors are advanced technological devices for monitoring stress and strain in extreme environments,but the coupling of temperature and strain at high temperature is a challenge for t...High-temperature thin-film strain sensors are advanced technological devices for monitoring stress and strain in extreme environments,but the coupling of temperature and strain at high temperature is a challenge for their use.Here,this issue is addressed by creating a composite ink that combines Pb_(2)Ru_(2)O_(6) and TiB_(2) using polysilazane(PSZ)as a binder.After direct writing and annealing the PSZ/Pb_(2)Ru_(2)O_(6)/TiB_(2) film at 800℃ in air,the resulting thin film exhibits a low temperature coefficient of resistance(TCR)of only 281 ppm/℃ over a wide temperature range from 100℃ to 700℃,while also demonstrating high sensitivity with a gauge factor approaching 19.8.This exceptional performance is attributed to the intrinsic properties of Pb_(2)Ru_(2)O_(6),which has positive TCR at high temperature,and TiB2,which has negative TCR at high temperature.Combining these materials reduces the overall TCR of the film.Tests showed that the PSZ/Pb_(2)Ru_(2)O_(6)/TiB_(2) film maintains stable strain responses and significant signal output even under varying temperature.These findings provide valuable insights for developing high-temperature strain sensors with low TCR and high sensitivity,highlighting their potential for applications in high-temperature strain measurements.展开更多
基金supported by National Natural Science Foundation of China(Grant Nos.52572185,12204427 and 52272166)Natural Science Foundation of Henan Province of China(Grant Nos.242300421217,and 222300420299).
文摘Circularly polarized luminescence perovskite nanocrystals(NCs)hold great potential in the field of information encryption,3D display and spintronics.However,the synthesis of the chiral perovskites is still confronted with various problems,such as cumbersome synthesis process,poor compatibility and limited processability,which impede their further implementation.In this study,a one-step wet-ball-milling method is proposed for the scale-up synthesis(up to 500 mL)of chiral perovskite ink,where the chiral molecule R-/S-1,2-diphenylethylenediamine(R-/S-DPEM)are introduced as chiral initiator.Chiral R-/S-DPEM molecules can endow the chirality to perovskite NCs through the strong coupling with perovskite surface.Specifically,ethyl cellulose is incorporated as passivating agents and structural supporting molecules,which can not only passivate the perovskite NCs and improve their stability,but also enable the chiral ink to possess better processability.The obtained ink is compatible with multiple substrates,which can be directly processed into various luminescent patterns by means of screen printing,writing,impregnation,laser engraving,etc.These patterns demonstrate high storage stability,flexibility and water resistance,fulfilling the requirements of a wide range of occasions in the future.This work provides a feasible solution for scalable synthesis of chiral perovskite inks,which offer promising prospects in optical anti-counterfeiting,information encryption and wearable optoelectronic devices.
基金supported by National Natural Science Foundation of China(Nos.52188102,U2013213,51820105008)the Technology Innovation Project of Hubei Province of China under Grant No.2019AEA171+1 种基金The project of introducing innovative leading talents in Songshan Lake High-tech Zone,Dongguan City,Guangdong Province(No.2019342101RSFJ-G)the support from Flexible Electronics Research Center of HUST for providing experiment facility。
文摘Direct ink writing(DIW)holds enormous potential in fabricating multiscale and multi-functional architectures by virtue of its wide range of printable materials,simple operation,and ease of rapid prototyping.Although it is well known that ink rheology and processing parameters have a direct impact on the resolution and shape of the printed objects,the underlying mechanisms of these key factors on the printability and quality of DIW technique remain poorly understood.To tackle this issue,we systematically analyzed the printability and quality through extrusion mechanism modeling and experimental validating.Hybrid non-Newtonian fluid inks were first prepared,and their rheological properties were measured.Then,finite element analysis of the whole DIW process was conducted to reveal the flow dynamics of these inks.The obtained optimal process parameters(ink rheology,applied pressure,printing speed,etc)were also validated by experiments where high-resolution(<100μm)patterns were fabricated rapidly(>70 mm s^(-1)).Finally,as a process research demonstration,we printed a series of microstructures and circuit systems with hybrid inks and silver inks,showing the suitability of the printable process parameters.This study provides a strong quantitative illustration of the use of DIW for the high-speed preparation of high-resolution,high-precision samples.
文摘In order to solve the low efficiency and poor precision problems of traditional ink control methods on domestic offset printers,developing modern ink automatic control system has become more and more urgent.As an important subsystem,the hu-man computer interface(HCI)is a key function for the wholly automatic control.Once this goal is obtained,all the printing pro-cedures especially the automatic control of ink volume should be finished with human computer interface in different areas.consid-ering the HCI design theory and structure characteristics of domestic printers comprehensively,the HCI prototype for automatic ink control system has been developed based on Visual Basic platform.As the individual ink key is instead of the integrated key,the di-vision result of ink fountain can be displayed on the interface.Through the interface,the dynamic adjusting functions such as mod-ifying ink volume,locking or unlocking each ink key and real-time displaying the adjusting results etc.can be completed.The sim-ulation test has shown that the opening and practical feature of the prototype is satisfactory.
文摘ZTE Corporation has signed strategic telecommunications software agreement with two leading providers in Europe and Latin America to optimize its offerings for target customers in
基金support from the National Key Research and Development Program of China(No.2021YFB3701503)the Key Research and Development Program of Ningbo,China(No.2023Z107).
文摘As a novel 2D material,Ti_(3)C_(2)T_(x)-MXene has become a major area of interest in the field of microwave absorption(MA).However,the MA effect of common Ti_(3)C_(2)T_(x)-MXene is not prominent and often requires complex processes or combinations of other ma-terials to achieve enhanced performance.In this context,a kind of gradient woodpile structure using common Ti_(3)C_(2)T_(x)-MXene as MA ma-terial was designed and manufactured through direct ink writing(DIW)3D printing.The minimum reflection loss(RL_(min))of the Ti_(3)C_(2)T_(x)-MXene-based gradient woodpile structures with a thickness of less than 3 mm can reach-70 dB,showing considerable improve-ment compared with that of a completely filled structure.In addition,the effective absorption bandwidth(EAB)reaches 7.73 GHz.This study demonstrates that a Ti_(3)C_(2)T_(x)-MXene material with excellent MA performance and tunable frequency band can be successfully fab-ricated with a macroscopic structural design and through DIW 3D printing without complex material hybridization and modification,of-fering broad application prospects by reducing electromagnetic wave radiation and interference.
基金supported by MEXT KAKENHI Grant(24K01295,26286013).
文摘Traditional p-type colloidal quantum dot(CQD)hole transport layers(HTLs)used in CQD solar cells(CQDSCs)are commonly based on organic ligands exchange and the layer-by-layer(LbL)technique.Nonetheless,the ligand detachment and complex fabrication process introduce surface defects,compromising device stability and efficiency.In this work,we propose a solution-phase ligand exchange(SPLE)method utilizing inorganic ligands to develop stable p-type lead sulfide(PbS)CQD inks for the first time.Various amounts of tin(Ⅱ)iodide(SnI_(2))were mixed with lead halide(PbX_(2);X=I,Br)in the ligand solution.By precisely controlling the SnI_(2)concentration,we regulate the transition of PbS QDs from n-type to p-type.PbS CQDSCs were fabricated using two different HTL approaches:one with 1,2-ethanedithiol(EDT)-passivated QDs via the LbL method(control)and another with inorganic ligand-passivated QD ink(target).The target devices achieved a higher power conversion efficiency(PCE)of 10.93%,compared to 9.83%for the control devices.This improvement is attributed to reduced interfacial defects and enhanced carrier mobility.The proposed technique offers an efficient pathway for producing stable p-type PbS CQD inks using inorganic ligands,paving the way for high-performance and flexible CQD-based optoelectronic devices.
基金supported by National Key Research and Development Program of China(Grant No.2022YFB3809000)Major Science and Technology Project of Gansu Province(Grant No.23ZDGA011)+1 种基金National Natural Science Foundation of China(Grant No.22275199,52105224)the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB04701022021).
文摘Compared to subtractive manufacturing and casting,3D printing(additive manufacturing)offers advantages,such as the rapid production of complex structures,reduced material waste,and environmental friendliness.Direct ink writing(DIW)is one of the most popular 3D printing techniques owing to its ability to print multiple materials simultaneously and its high compatibility with printing inks.However,DIW presents significant challenges,particularly in the printing of high-performance polymers.The main challenges are as follows:1.The rigid structures and reaction kinetics of high-performance polymers make developing new inks difficult.2.The limited types of available high-performance polymers underscore the need for new DIW-suitable materials.3.Layer-by-layer stacking weakens interlayer bonding,affecting the mechanical properties of the printed product.4.The accuracy and speed of DIW printing are insufficient for large-scale manufacturing.After introducing the topic,the requirements for DIW printing inks are first reviewed,emphasizing the importance of thixotropic agents.Then,research progress regarding DIW printing of high-performance polymers is comprehensively reviewed according to the requirements of different polymer inks.Additionally,the applications of these materials across various fields are summarized.Finally,the challenges in DIW printing of high-performance polymers,along with corresponding solutions and future development prospects,are discussed in detail.
基金Research results of the General Scientific Research Project of Zhejiang Education Department in 2024,“Research on the Digitalization of Song Yun Ink Painting-Taking the Ten Scenes of West Lake as an Example”(Project No.:Y202455200).
文摘This study examines the development of painting techniques of Chinese ink wash landscape paintings,pays attention to its unique brush and ink language and features of the representation of elements,and deeply analyzes the artistic characteristics of digital ink wash texture materials.The research focuses on key aspects such as the ink brushstrokes with the combination of emptiness and reality,the profound and serene ink wash space,and the extremely ingenious position layout.It proposes a construction path of digital ink wash texture materials based on the Blender material node system.This method makes use of the flexibility of the Blender material node system to successfully simulate highly realistic digital ink wash textures.It can not only construct static ink wash textures but also realize the dynamic transformation of static ink wash works through animation nodes and procedural control,thereby enhancing the artistic expression of digital ink wash works.The proposal and implementation of this method expand the application scope of the Blender material node system,help deeply explore the potential of digital ink wash art,and open up a brand new research path for constructing digital ink wash textures.
基金the National Key Research and Development Program of China(No.2020YFB1313100)the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA16020803)+2 种基金the National Natural Science Foundation of China(Nos.51875557 and 52205319)the Research Equipment Development Program of the Chinese Academy of Sciences(No.YJKYYQ20190045)the Foundation of State Key Laboratory of Robotics(Nos.2021-Z01,2022-Z04 and 2023-Z01)。
文摘Flexible electronic technology has laid the foundation for complex human-computer interaction system,and has attracted great attention in the field of human motion detection and soft robotics.Graphene has received an extensive attention due to its excellent electrical conductivity;however,how to use it to fabricate wearable flexible sensors with complex structures remains challenging.In this study,we studied the rheological behavior of graphene/polydimethylsiloxane ink and proposed an optimal graphene ratio,which makes the ink have an good printability and conductivity at the same time.Then,based on the theory of Peano fractal layout,we proposed a two-dimensional structure that can withstand multi-directional tension by replacing the traditional arris structure with the arc structure.After that,we manufactured circular arc fractal structure sensor by adjusting ink composition and printing structure through direct ink writing method.Finally,we evaluated the detection performance and repeatability of the sensor.This method provides a simple and effective solution for fabricating wearable flexible sensors and exhibits the potential to fabricate 3D complex flexible electronic devices.
基金Funded by the National Natural Science Foundation of China(No.62171331)the Hubei Provincial Natural Science Foundation of China(No.2020CFB188)the Sanya Science and Education Innovation Park of Wuhan University of Technology(No.2020KF0030)。
文摘This study systemmatically investigated the effects of solid content and dispersant content on the physicochemical properties of ZnO-SnO_(2) composite ink.The experimental results show that even with the use of low-molecular-weight PEG400 dispersant,gas-sensitive ink with high solid content and good suspension stability can be obtained,which is advantageous for low-temperature film formation and can effectively prevent property changes and film crack of high-temperature-sintering-induced material.Under this condition,the ink at a 15wt%solid content and 2wt%-10wt%PEG400 has good film-forming ability and high adhesion strength on the micro-electromechanical system(MEMS)micro-hotplates.Especially,the MEMS sensor printed using the ink of 6wt%PEG400 shows highest sensitivity,favorable impact resistance,thermal shock resistance,and up to 8 years of service life.
基金provided by the Department of Energy Office of Energy Efficiency and Renewable Energy Solar Energy Technologies Office under contract No.DEEE0010501。
文摘Screen printing using metal particle pastes,the current photovoltaic industry metallization standard,provides fast and reliable metal grids for silicon solar cells.Recently,metal complex or reactive metal inks are attracting research interest due to their significantly low cost and higher performance compared to traditional nanoparticle silver pastes.In this work,we demonstrate,for the first time,screen-printed high-efficiency silicon heterojunction solar cells metallized by silver metal complex inks on industrial G1-size(158.75×158.75 mm^(2))wafers.
基金funded by the Natural Science Founda-tion of Zhejiang Province,China(No.LTGS23D060001)the Scientific Research Foundation for the Introduc-tion of Talent of Zhejiang Ocean University(No.JX6311130823).
文摘The polysaccharides from Sepia esculenta ink are potential candidates for biomedical applications due to their functional properties.In our study,a heteropolysaccharide,SE-1,isolated from Sepia esculenta ink,had a molecular weight of 13.1 kDa and a monosaccharide composition of Man:GlcN:GlcUA:GalN:Xyl:Fuc=1.00:1.38:0.65:2.89:0.76:1.99.Through partial acid hydrolysis,me-thylation and one-and two-dimensional nuclear magnetic resonance(1D and 2D NMR)spectroscopic analyses,it is indicated that the structure of SE-1 consists of→4)-α-D-GlcpNAc-(1→,→4)-α-L-Fucp-(1→,→3)-α-D-GalpNAc-(1→,→2,6)-α-D-Manp-(1→and→3)-β-D-GlcpUA-(1→as the main chain and single terminalβ-D-Xylp-(1→,which links to O-2 of(1→2,6)-α-Manp,as the side chain.A new aminosugar-abundant heteropolysaccharide was isolated from S.esculenta ink for the first time.
基金supported by the Shenzhen Polytechnic Research Fund(6023310025K)Post-doctoral Later-stage Foundation Project of Shenzhen Polytechnic(6023271017K)Horizontal Technology Development Project(6024260101K).
文摘Quantumdot inks(QDIs)represent an emerging functionalmaterial that integrates nanotechnology and fluid engineering,demonstrating significant application potential in flexible optoelectronics and high-color gamut displays.Their wide applicability is due to a unique quantum confinement effect that enables precise spectral tunability and solution-processable properties.However,the complex fluid dynamics associated with QDIs at micro-/nano-scales severely limit the accuracy of inkjet printing and pattern deposition.This review systematically addresses recent advances in the hydrodynamics of QDIs,establishing scientific mechanisms and key technical breakthroughs from an interdisciplinary perspective.Current research has focused on three optimization directions:(1)regulating ligand structures to enhance colloidal stability,flow consistency,and anti-shear performance while mitigating nanoparticle aggregation;(2)incorporating low-viscosity or high-volatility solvents and surface tension modifiers to modify droplet dynamic characteristics and suppress the“coffee-ring”effect;(3)integrating advanced technologies such as electrohydrodynamic jetting and microfluidic targeted deposition to achieve submicron pattern resolution and high film uniformity,expanding adaptability in flexible electronics,biosensing,and anti-counterfeiting printing.A comparison of current technical routes and critical performance indicators has identified the dominant variables that influence QDI macroscopic/microscopic properties.A comprehensive analytical framework is presented which spans material structure,rheological behavior,manufacturing processes,and functional characteristics.Moreover,a proposed engineering‘structure–parameter–behavior–performance’serves to link core–shell structure,formulation parameters(e.g.,viscosity and surface tension),fluidic behavior(e.g.,shear thinning and Marangoni flow),and device performance(e.g.,resolution and photoluminescence efficiency).The findings provide theoretical support and decision-making guidance for the large-scale application and interdisciplinary expansion of QDIs.
基金supported by State Key Laboratory of Powder Metallurgy,Central South University,Changsha,China.
文摘To overcome reliance on molds and the difficulty of fabricating complex geometries with traditional C/C composites,direct ink writing(DIW)with UV/heat dual curing was employed to produce high-performance C/C composites.The rheological properties of the composite inks were systematically analyzed to assess the effects of phenolic resin(PR)and carbon fiber(CF)content.Results show pronounced shear-thinning behavior and strong thixotropy-both essential for stable DIW.Additionally,UV/heat curing behavior was characterized to provide theoretical insights for optimizing curing parameters.Notably,CF addition is found to significantly attenuate UV light penetration compared to pure PR.As CF content increases,the critical UV irradiation energy rises sharply from 68.47 to 911.19 mJ/cm^(2),necessitating precise adjustments to curing parameters.Preforms were pyrolyzed in a carbon tube furnace to examine pore-formation characteristics,and chemical vapor infiltration(CVI)was applied to filling the resulting pores,yielding C/C composites with a flexural strength of 115.19 MPa.
基金Project(22020JJ4729)supported by the Natural Science Foundation of Hunan Province,China。
文摘Polyvinylidene fluoride/lead zirconate titanate(PVDF/PZT)composite films have been prepared by direct ink writing and the effect of PZT content on crystallization behavior and electrical properties of film were systematically investigated.The composite films were characterized by scanning electron microscope(SEM),X-ray diffractometer(XRD),Flourier transform infrared spectroscope(FTIR)and differential scanning calorimeter(DSC).The results show that,surface modified PZT powder(PZT@PDA)is successfully coated by polydopamine(PDA),resulting in a large number of polar groups that interact with the-CF_(2)-groups in PVDF,inducing the generation of polarβphase due to hydrogen bonding formed in the interaction.Theβphase content in composite film increases with increasing PZT@PDA content,up to 28.09%as with 5 wt.%PZT@PDA.PZT@PDA plays a role of nucleating agent to promote the generation of polar phases in the film and also acts as an impurity hindering the growth of nuclei to reduce crystallinity.Moreover,the presence of PZT@PDA in interfaces provides more sites for the occurrence of interfacial polarization and thus improving the electrical properties of films.The composite film with 5 wt.%PZT@PDA possesses the highest dielectric constant(8.61)and residual polarization value(0.6803μC/cm^(2)).
基金the National Key Research and Development Program of China(Grant No.2021YFB2012100)the Major Science and Technology Projects in Fujian Province(Grant No.2023HZ021005)+1 种基金the Open Project Program of Fujian Key Laboratory of Special Intelligent Equipment Measurement and Control(Grant No.FJIES2023KF06)the Industry-University-Research Co-operation Fund of the Eighth Research Institute of China Aerospace Science and Technology Corporation(Grant No.SAST2023-061).
文摘High-temperature thin-film strain sensors are advanced technological devices for monitoring stress and strain in extreme environments,but the coupling of temperature and strain at high temperature is a challenge for their use.Here,this issue is addressed by creating a composite ink that combines Pb_(2)Ru_(2)O_(6) and TiB_(2) using polysilazane(PSZ)as a binder.After direct writing and annealing the PSZ/Pb_(2)Ru_(2)O_(6)/TiB_(2) film at 800℃ in air,the resulting thin film exhibits a low temperature coefficient of resistance(TCR)of only 281 ppm/℃ over a wide temperature range from 100℃ to 700℃,while also demonstrating high sensitivity with a gauge factor approaching 19.8.This exceptional performance is attributed to the intrinsic properties of Pb_(2)Ru_(2)O_(6),which has positive TCR at high temperature,and TiB2,which has negative TCR at high temperature.Combining these materials reduces the overall TCR of the film.Tests showed that the PSZ/Pb_(2)Ru_(2)O_(6)/TiB_(2) film maintains stable strain responses and significant signal output even under varying temperature.These findings provide valuable insights for developing high-temperature strain sensors with low TCR and high sensitivity,highlighting their potential for applications in high-temperature strain measurements.
