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Piezoelectric Drop-on-Demand Inkjet Printing with Ultra-High Droplet Velocity

Research 2024年第3期2023卷 123-137页

作者： Zhengjie Yang Hongmiao Tian Chunhui Wang Xiangming Li Xiaoliang Chen Xiaoming Chen jinyou shao State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’anShaanxi 710049China Frontier Institute of Science and Technology(FIST) Xi’an Jiaotong UniversityXi’anShaanxi 710049China.

Improving droplet velocity as much as possible is considered as the key to improving both printing speed and printing distance of the piezoelectric drop-on-demand inkjet printing *** are 3 tough and contradictory issues that need to be addressed simultaneously,namely,the actuation pressure of the piezoelectric printhead,satellite droplets,and the air resistance,which seems almost impossible to achieve with classical ***,a novel solution is *** modulating the positive crosstalk effect inside and outside the printhead,self-tuning can be achieved,including self-reinforcing of the actuation pressure,self-restraining of satellite droplets,and self-weakening of the air resistance,thereby greatly improving droplet *** on these mechanisms,waveform design methods for different inks and printheads are *** results demonstrate that monodisperse droplet jetting with a maximum velocity of 27.53 m/s can be achieved,reaching 3 to 5 times that of the classical method(5 to 8 m/s).Correspondingly,the printing speed and distance can be simultaneously increased by almost 10 times,demonstrating an ability of direct printing on irregular ***,the compatibility of ink materials is expanded,as the Ohnesorge number and the viscosity of printable inks for the printhead used are increased from 0.36–0.72 to 0.03–1.18 and from 10–12 cp to 1–40.3 cp,respectively,even breaking the traditional limitations of the piezoelectric printing technology(Ohnesorge number of 0.1 to 1;viscosity of 1 to 25 cp).All the above provide a new perspective for improving droplet velocity and may even offer a game-changing choice for expanding the boundaries of the piezoelectric drop-on-demand inkjet printing technology.

关键词： piezoelectric viscosity thereby

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A flexible dual-function capacitive sensor enhanced by looppatterned fibrous electrode and doped dielectric pillars for spatial perception

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Nano Research 2023年第5期16卷 7550-7558页

作者： Yongsong Luo Xiaoliang Chen Xiangming Li Hongmiao Tian Liang Wang jinyou shao Micro-and Nano-technology Research Center State Key Laboratory for Manufacturing Systems EngineeringXi’an Jiaotong UniversityXi’an 710049China Frontier Institute of Science and Technology(FIST) Xi’an Jiaotong UniversityXi’an 710049China

The integrated perception capable of detecting and monitoring varieties of activities is one of the ultimate purposes of wearable electronics and intelligent *** by the space occupation,it lacks practical feasibility to stack multiple types of single sensors on each ***,a high-sensitivity dual-function capacitive sensor with proximity sensing and pressure sensing is *** fringing electric field can be confined in the proximity-sensitive area by fibrous loop-patterned electrode,leading to more stolen charges when object approaching and thus a high proximity *** high-permittivity doped structured dielectric layer reduces the compressive stiffness and enhances the rate of compression-caused increase in the equivalent relative permittivity of the dielectric layer,resulting in a larger increase in capacitance and thus a high pressure *** electrodes and dielectric layer together compose the capacitor and act as the sensor without taking up additional *** decoupling of proximity-sensing and pressure-sensing modes can be achieved by decrease or increase in *** with array distribution and sequential scanning,the sensors can be used for detection of motion trajectory,contour recognition,pressure distribution.

关键词： capacitive proximity sensing pressure sensing fibrous microstructuring doping

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Nanoimprint lithography for the manufacturing of flexible electronics

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Science China(Technological Sciences) 2019年第2期62卷 175-198页

作者： shao jinyou CHEN XiaoLiang LI XiangMing TIAN HongMiao WANG ChunHui LU BingHeng State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University

Flexible electronics have received considerable attention in academies and industries for their promising applications in enormous fields, such as flexible displays, wearable sensors, artificial skins, and flexible energy devices. Challenges remain in developing a flexible and scalable manufacturing method to facilitate the fabrication of multi-functional structures in a flexible electronic system. Nanoimprint lithography is a high resolution and low-cost approach to fabricate nanostructures over a large area. This paper reviews recent progress of nanoimprint lithography and its applications in flexible electronics. The basic principles, classification, research focus, and critical issues of nanoimprint lithography are elaborated. Then, the advantages of nanoimprint lithography are demonstrated in several typical applications related to flexible electronics, including conductive films, optoelectronic devices, flexible sensors, energy harvesting and storage devices, and bioinspired electronic devices. Finally,the challenges and perspectives of nanoimprint lithography in flexible electronic systems are discussed.

关键词： nanoimprint lithography manufacturing flexible electronics nanostructures sensors

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Discretely-supported nanoimprint lithography for patterning the high-spatial-frequency stepped surface

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Nano Research 2021年第8期14卷 2606-2612页

作者： Chunhui Wang Yu Fan jinyou shao Zhengjie Yang Jiaxing Sun Hongmiao Tian Xiangming Li Micro-and Nano-technology Research Center State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China

Non-planar morphology is a common feature of devices applied in various physical fields,such as light or fluid,which pose a great challenge for surface nano-patterning to improve their *** present study proposes a discretely-supported ***(NIL)technique to fabricate nanostructures on the extremely non-planar surface,namely high-spatial-frequency stepped *** designed discretely imprinting template implanted a discretely-supported intermediate buffer layer made of sparse pillars *** allowed the simultaneous generation of air-cushion-like buffer and reliable support to the thin structured layer in the *** resulting low bending stiffness and distributed concentrated load of the template jointly overcome the contact difficulty with a stepped surface,and enable the template to encase the stepped protrusion as tight as *** on the proposed discretely-supported NIL,nanostructures were fabricated on the luminous interface of light emitting diodes chips that covered with micrometer step electrodes *** 96%of the utilized indium tin oxide transparent current spreading layer surface on top of the light emitting diode(LED)chips was coated with nanoholes array,with an increase by more than 40%in the optical output *** excellent ability of nanopatterning a non-planar substrate could potentially lead innovate design and development of high performance device based on discretely-supported NIL.

关键词： nanoimprint lithography non-planar surface discretely-supported template nanopatterning semiconductor light emitting devices

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Mechanical properties and enhancement mechanisms of titanium-graphene nanocomposites

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Acta Mechanica Sinica 2020年第4期36卷 855-865页

作者： Wanhong Tang Jie Zhang Jianyang Wu jinyou shao Peng Ding Guozhen Hou Xiaoming Chen Micro-and Nanotechnology Research Center State Key Laboratory for Manufacturing Systems EngineeringXi'an Jiaotong UniversityXi'an 710049China Electronic Materials Research Lab Key Lab of the Ministry of EducationXi’an Jiaotong UniversityXi’an 710049China Department of Physics Jiujiang Research Institute and Research Institute for Biomimetics and Soft MatterFujian Provincial Key Laboratory for Soft Functional Materials ResearchXiamen UniversityXiamen 361005China

Molecular dynamics(MD)simulations of the titanium-graphene nanocomposites(TiGNCs)under uniaxial tension are carried out to investigate the mechanical properties and reinforcement mechanism of graphene in *** is found that introduction of mechanically robust graphene limits the strain-induced dislocation and araorphization and thereby highly improves the mechanical properties of metallic titanium that are greatly affected by the crystal stacking orientation of graphene and titanium *** thickness of titanium layers,interface interaction and working temperature play an important role in the mechanical strength and elastic moduli of *** results show the mechanical properties of TiGNCs are monotonically enhanced with reduction of the titanium layer thickness and working temperature,and the Young5s modulus obtained by MD simulation are higher than that predicted by the rule of mixture(ROM)due to consideration of interfacial interaction in computational *** addition,once the critical thickness of titanium layer is reached,graphene wrinkles are induced in composites because of Poisson's effect induced large lateral compression stress in the interface *** study provides helpful insights into fundamental understanding reinforcing mechanism of graphene and ultimately contribute to the optimal design and performance of mechanically robust graphene-based metallic composites.

关键词： Mechanical properties Enhancement mechanisms Titanium-graphene composites Wrinkling Molecular dynamics

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A facile method to fabricate surfaces showing superhydrophilicity in air and superhydrophobicity in oil

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Science China(Technological Sciences) 2017年第11期60卷 1724-1731页

作者： YE XiangDong GUO YuXuan JIA YanChao YE Xin WANG Shuai CAI AnJiang WU XiaoJun shao jinyou Shaanxi Key Laboratory of Nanomaterials and Nanotechnology Xi'an University of Architecture and Technology State Key Laboratory of Manufacturing Systems Engineering Xi'an Jiaotong University

The changes of the wettability of the solid surfaces have attracted massive attention due to their important practical implications in numerous fields. As a new subject, the research on the wettability under the different environments is still in its early stage. So the fundamental research must be performed for the practical applications under different environments. However, it is seldom that the comprehensive wettability of a surface in air, in water and in oil has been reported. In this paper, the authors investigated the wettability of the stainless steel mesh coated with polyurethane in the above three different environments. The surface of the uncoated mesh was found to be hydrophobic in air, but the surface of the coated mesh was superhydrophilic in air. More interestingly, the surfaces of the coated meshes were superoleophilic in water and superhydrophobic in oil. Due to the coated meshes with these wettabilities were fabricated via a facile two-step method, the presented method may be adopted for large-scale industrial production, in various fields, such as icing prevention or the oil-field industry.

关键词： wettability polyurethane coated mesh superhydrophilicity superhydrophobicity superoleophilicity

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Ultrastable Viologen Ionic Liquids-Based Ionogels for Visible Strain Sensor Integrated with Electrochromism,Electrofluorochromism,and Strain Sensing

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CCS Chemistry 2023年第8期5卷 1917-1930页

作者： Yueyan Zhang Mengying Guo Guoping Li Xiaoliang Chen Zishun Liu jinyou shao YongAn Huang Gang He Frontier Institute of Science and Technology Xi’an Jiaotong UniversityXi’an 710054 Micro-/Nano-technology Research Center State Key Laboratory for Manufacturing Systems EngineeringXi’an Jiaotong UniversityXi’an 710054 International Center for Applied Mechanics State Key Laboratory for Strength and Vibration of Mechanical StructuresXi’an Jiaotong UniversityXi’an 710049 State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074

Flexible electronics play a key role in the development of human society and our daily *** they are expected to revolutionize personal health ***,it remains challenging to fabricate smart sensors with high robustness,reliability,and visible ***,high-performance electrochromic(EC),electro-fluorochromic(EFC),and double-network ionogels with excellent transmissivity,high mechanical robustness,and ultrastable reversibility are prepared by combination of thienoviologen-containing ionic liquids with poly(ethyl acrylate)*** ionogels exhibit good mechanical properties(1000%stretchability and 3.2 kJ m^(−2) fracture energy).The ionogel-based EC devices have a significantly simplified device fabrication process as well as superior cycling stability in which 88%of the contract ratio is maintained at 88%at 500 cycles,even after being stored for 2 years under ambient atmosphere(relative humidity:30%∼40%,25°C).The conductivity of ionogels showed a fast and reproducible response to strain,and the conductivity decreased with increased *** virtue of the EC and EFC properties of the thienoviologen component,the EC and EFC efficiency decreased with the increased strain loaded on the ionogels,and almost no EC or EFC phenomena were observed when the strain was above 300%.This feasible strategy provides an opportunity for the development of visible strain sensors to monitor the body’s movements through color and fluorescence emission.

关键词： ionogels flexible electronics viologen electrochromism strain sensor

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基于原子/分子团簇结构的材料与器件制造

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中国科学基金 2024年第1期38卷 115-131页

作者：邵金友宋凤麒李祥明杨扬谭新峰詹东平金明尚孙頔付德君谭元植许辉西安交通大学精密微纳制造技术全国重点实验室西安交通大学前沿科学技术研究院南京大学固体微结构国家物理重点实验室厦门大学萨本栋微米纳米科学技术研究院清华大学高端装备界面科学与技术全国重点实验室山东大学化学与化工学院/晶体材料国家重点实验室武汉大学物理科学与技术学院人工微纳米结构教育部重点实验室厦门大学固体表面物理化学国家重点实验室黑龙江大学功能无机材料化学教育部重点实验室

原子/分子团簇是物质结构的一种新形态，具有独特的本征性质。从原子/分子团簇到器件的跨尺度制造，将为国防高端装备和新兴电子等产业发展带来深刻变革。团簇的多物质构效关系、宏量制造、团簇结构跨尺度构筑以及团簇器件的高性能制造... 详细信息

原子/分子团簇是物质结构的一种新形态，具有独特的本征性质。从原子/分子团簇到器件的跨尺度制造，将为国防高端装备和新兴电子等产业发展带来深刻变革。团簇的多物质构效关系、宏量制造、团簇结构跨尺度构筑以及团簇器件的高性能制造等是原子/分子团簇器件制造的关键发展方向，主导着从原子到产品制造的发展历程。把握这些发展背后的重要机遇，将有助于占领原子级制造研究的制高点，引领原子级制造方法的变革。本文从团簇新材料的宏量制造、新型功能器件的原子/分子团簇构筑、团簇—器件的跨尺度制造工艺和装备等三个方面概括了原子/分子团簇与器件制造领域的主要研究进展，总结了原子/分子团簇与器件领域的关键科学问题及面临的挑战，并对其未来发展方向和发展战略给出了建议。

关键词：原子/分子团簇功能器件定域组装异质/异构界面构效关系宏量制造

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Electrically induced nanostructuring over large area——a new idea from concept to practice

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Engineering Sciences 2013年第1期11卷 23-28,38页

作者： Li Xiangming Ding Yucheng shao jinyou Liu Hongzhong School of Mechanical Engineering Xi'an Jiaotong University State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University

The paper proposes a novel nano-patterning method called electrically induced nanostructuring, where an external electric field, insteadof the external mechanical pressure, is applied to generate an electrohydrody- namic force acting on the polymer-air interface to drive the polymer＇ s flow into the mold cavities. This electri- cally induced nanostrueturing method no longer requires a large mechanical pressure externally applied for actua- ting the polymer filling in the mold cavities, and has been used to successfully fabricate micro/nano pillar arrays of a high aspect ratio （up to 10）, which have been usually considered to be ＂difficult to fabricate＂ by conventional molding or nanoimprinting processes.

关键词： nano-manufacturing electrohydrodynamic force high aspect ratio nanoimprinting

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Gecko-Inspired Slant Hierarchical Microstructure-Based Ultrasensitive Iontronic Pressure Sensor for Intelligent Interaction

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Research 2022年第4期2022卷 1-13页

作者： Yongsong Luo Xiaoliang Chen Hongmiao Tian Xiangming Li Yangtianyu Lu Yang Liu jinyou shao Micro-and Nano-Technology Research Center State Key Laboratory for Manufacturing Systems EngineeringXi'an JiaotongUniversityXi'an710049China Frontier Institute of Science and Technology(FIST) Xian Jiaotong UniversityXi'an 710049China

Highly sensitive flexible pressure sensors play an important role to ensure the safety and friendliness during the human-robot interaction *** the active layer has been shown to improve performance of pressure ***,the current structural strategy almost relying on axial compression deformation suffers structural stifening,and together with the limited area growth efficiency of conformal interface,essentially limiting the maximum ***,inspired by the interface contact behavior of gecko's feet,we design a slant hierarchical microstructure to act as an electrode contacting with an ionic gel layer,fundamentally eliminating the pressure resistance and maximizing functional interface expansion to achieving ultrasensitive *** a structuring strategy dramatically improves the relative capacitance change both in the low-and high-pressure region,thereby boosting the sensitivity up to 36000kPa^(-1) and effective measurement range up to *** verify the advantages of high sensitivity,the sensor is integrated with a soft magnetic robot to demonstrate a biomimetic Venus *** ability to perceive weak stimuli allows the sensor to be used as a sensory and feedback window,realizing the capture of small live insects and the transportation of fragile objects.

关键词： robot boosting interface

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