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Strengthening poly(2-hydroxyethyl methacrylate) hydrogels using biochars and hydrophobic aggregations

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International Journal of smart and Nano Materials 2022年第4期13卷 561-574页

作者： Ping Zhang Ziyi Xu Zhiying Wu Ping Xu Canhui Yang shenzhen key laboratory of soft mechanics&smart manufacturing Department of Mechanics and Aerospace EngineeringSouthern University of Science and TechnologyShenzhenP.R.China Department of Chemistry City University of Hong KongHong KongP.R.China Department of Respiratory and Critical Care Medicine Peking University Shenzhen HospitalShenzhenGuangdongP.R.China

As the first version of synthetic hydrogel,poly(2-hydroxyethyl methacrylate)hydrogels have found broad ***,their poor mechanical performances have been longstanding hurdles for practical ***,we report on strengthening the poly(2-hydroxyethyl methacrylate)hydro-gels with biochar nanoparticles and hydrophobic aggregations,which are induced by solvent exchange and reinforced by *** the vast anchoring points on the multifunc-tional surfaces of the biochar nanoparticles and the aggregates formed between poly(2-hydroxyethyl methacrylate)chains engender strong and dissipative physical *** result-ing hydrogels exhibit marked mechanical properties,encom-passing high stretchability~7,high fracture toughness~1360 J m−2,high elastic modulus~180 kPa,low friction coefficient~0.2,self-recovery,and ***,we demonstrate the versatility of the proposed strategy by using water/ionic liquid binary solvent as the sol-vent system,Laponite as the nano-reinforcement,and dryanneal as the hydrophobic aggregation enhancer to synthesize mechanically robust ***(2-hydroxyethyl methacry-late)hydrogels of superior mechanical properties are expected to enable previously inaccessible applications in biomedicine and engineering.

关键词： Hydrogel PHEMA mechanical properties biochar hydrophobic aggregation

Two-photon polymerization-based 4D printing and its applications

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International Journal of Extreme manufacturing 2024年第1期6卷 1-25页

作者： Bingcong Jian Honggeng Li Xiangnan He Rong Wang Hui Ying Yang Qi Ge shenzhen key laboratory of soft mechanics&smart manufacturing Southern University of Science and TechnologyShenzhen 518055People’s Republic of China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China Pillar of Engineering Product Development Singapore University of Technology and Design8 Somapah RoadSingapore 487372Singapore

Two-photon polymerization(TPP)is a cutting-edge micro/nanoscale three-dimensional(3D)printing technology based on the principle of two-photon *** surpasses the diffraction limit in achieving feature sizes and excels in fabricating intricate 3D micro/nanostructures with exceptional *** concept of 4D entails the fabrication of structures utilizing smart materials capable of undergoing shape,property,or functional changes in response to external stimuli over *** integration of TPP and 4D printing introduces the possibility of producing responsive structures with micro/nanoscale accuracy,thereby enhancing the capabilities and potential applications of both *** paper comprehensively reviews TPP-based 4D printing technology and its diverse ***,the working principles of TPP and its recent advancements are ***,the optional4D printing materials suitable for fabrication with TPP are ***,this review paper highlights several noteworthy applications of TPP-based 4D printing,including domains such as biomedical microrobots,bioinspired microactuators,autonomous mobile microrobots,transformable devices and robots,as well as anti-counterfeiting *** conclusion,this paper provides valuable insights into the current status and future prospects of TPP-based4D printing technology,thereby serving as a guide for researchers and practitioners.

关键词： two-photonpolymerization 4D printing nano/micro fabrication microrobot

Laser-driven programmable non-contact transfer printing of objects onto arbitrary receivers via an active elastomeric microstructured stamp

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National Science Review 2020年第2期7卷 296-304页

作者： Hongyu Luo Chengjun Wang Changhong Linghu Kaixin Yu Chao Wang Jizhou Song Department of Engineering mechanics Soft Matter Research Center and Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang University

Transfer printing, as an important assembly technique, has attracted much attention due to its valuable merits to develop novel forms of electronics such as stretchable inorganic electronics requiring the heterogeneous integration of inorganic materials with soft elastomers. Here, we report on a laser-driven programmable non-contact transfer printing technique via a simple yet robust design of active elastomeric microstructured stamp that features cavities filled with air and embedded under the contacting surface, a micro-patterned surface membrane that encapsulates the air cavities and a metal layer on the inner-cavity surfaces serving as the laser-absorbing layer. The micro-patterned surface membrane can be inflated dynamically to control the interfacial adhesion, which can be switched from strong state to weak state by more than three orders of magnitude by local laser heating of the air in the cavity with a temperature increase below 100℃. Theoretical and experimental studies reveal the fundamental aspects of the design and fabrication of the active elastomeric microstructured stamp and the operation of non-contact transfer printing. Demonstrations in the programmable transfer printing of micro-scale silicon platelets and micro-scale LED chips onto various challenging receivers illustrate the extraordinary capabilities for deterministic assembly that are difficult to address by existing printing schemes, thereby creating engineering opportunities in areas requiring the heterogeneous integration of diverse materials such as curvilinear electronics and Micro LED displays.

关键词： tunable adhesion transfer printing heterogeneous integration laser-driven

Digital light processing based multimaterial 3D printing:challenges,solutions and perspectives

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International Journal of Extreme manufacturing 2024年第4期6卷 151-174页

作者： Jianxiang Cheng Shouyi Yu Rong Wang Qi Ge shenzhen key laboratory of soft mechanics&smart manufacturing Southern University of Science and TechnologyShenzhen 518055People's Republic of China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055People's Republic of China

Multimaterial(MM)3D printing shows great potential for application in metamaterials,flexible electronics,biomedical devices and robots,since it can seamlessly integrate distinctive materials into one printed *** numerous MM 3D printing technologies,digital light processing(DLP)MM 3D printing is compatible with a wide range of materials from hydrogels to ceramics,and can print MM 3D structures with high resolution,high complexity and fast *** paper introduces the fundamental mechanisms of DLP 3D printing,and reviews the recent advances of DLP MM 3D printing technologies with emphasis on material switching methods and material contamination *** also summarizes a number of typical examples of DLP MM 3D printing systems developed in the past decade,and introduces their system structures,working principles,material switching methods,residual resin removal methods,printing steps,as well as the representative structures and ***,we provide perspectives on the directions of the further development of DLP MM 3D printing technology.

关键词： multimaterial 3D printing digital lightprocessing multimaterial 3Dstructures

Transfer printing techniques for flexible and stretchable inorganic electronics

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npj Flexible Electronics 2018年第1期2卷 199-212页

作者： Changhong Linghu Shun Zhang Chengjun Wang Jizhou Song Department of Engineering mechanics Soft Matter Research Centerand Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceZhejiang University310027 HangzhouChina

Transfer printing is an emerging deterministic assembly technique for micro-fabrication and nano-fabrication,which enables the heterogeneous integration of classes of materials into desired functional *** creates engineering opportunities in the area of flexible and stretchable inorganic electronics with equal performance to conventional wafer-based devices but the ability to be deformed like a rubber,where prefabricated inorganic semiconductor materials or devices on the donor wafer are required to be transfer-printed onto unconventional flexible *** paper provides a brief review of recent advances on transfer printing techniques for flexible and stretchable inorganic *** basic concept for each transfer printing technique is *** performances of these transfer printing techniques are summarized and compared followed by the discussions of perspectives and challenges for future developments and applications.

关键词： printing inorganic discussions

Single-electron detection utilizing coupled nonlinear microresonators

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Microsystems & Nanoengineering 2020年第1期6卷 327-333页

作者： Xuefeng Wang Xueyong Wei Dong Pu Ronghua Huan Department of mechanics Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceZhejiang UniversityHangzhou 310027People’s Republic of China State key laboratory for manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China

Since the discovery of the electron,the accurate detection of electrical charges has been a dream of the scientific *** to some remarkable advantages,micro/nanoelectromechanical system-based resonators have been used to design electrometers with excellent sensitivity and ***,we demonstrate a novel ultrasensitive charge detection method utilizing nonlinear coupling in two micromechanical *** achieve single-electron charge detection with a high resolution up to 0.197±0.056 e=/√Hz Hz p at room *** findings provide a simple strategy for measuring electron charges with extreme accuracy.

关键词： temperature utilizing nonlinear

Frequency unlocking-based MEMS bifurcation sensors

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Microsystems & Nanoengineering 2023年第3期9卷 171-181页

作者： Yan Qiao Zhan Shi Yutao Xu Xueyong Wei Alaaeldin Elhady Eihab Abdel-Rahman Ronghua Huan Wenming Zhang State key laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghaiChina Department of mechanics Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceZhejiang UniversityHangzhouChina State key laboratory for manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’anChina Department of Systems Design Engineering University of WaterlooWaterlooONCanada

MEMS resonators exhibit rich dynamic behaviors under the internal resonance regime. In this work, we present a novel MEMS bifurcation sensor that exploits frequency unlocking due to a 1:3 internal resonance between two electrostatically coupled micro-resonators. The proposed detection mechanism allows the sensor to operate in binary (digital) and analog modes, depending on whether the sensor merely detects a significant jump event in the peak frequency upon unlocking or measures the shift in the peak frequency after unlocking and uses it in conjunction with a calibration curve to estimate the corresponding change in stimulus. We validate the success of this sensor paradigm by experimentally demonstrating charge detection. High charge resolutions are achieved in binary mode, up to 0.137 fC, and in analog mode, up to 0.01 fC. The proposed binary sensor enables extraordinarily high detection resolutions due to the excellent frequency stability under internal resonance and the high signal-to-noise ratio of the shift in peak frequency. Our findings offer new opportunities for high-performance ultrasensitive sensors.

关键词： locking bifurcation binary

Tailoring edge and interface states in topological metastructures exhibiting the acoustic valley Hall effect

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Science China(Physics,mechanics & Astronomy) 2020年第2期63卷 82-92页

作者： Jiao Wang Yang Huang WeiQiu Chen key laboratory of soft Machines and smart Devices of Zhejiang Province Department of Engineering MechanicsZhejiang UniversityHangzhou 310027China State key Lab of CAD&CG Zhejiang UniversityHangzhou 310058China soft Matter Research Center Zhejiang UniversityHangzhou 310027China

In this study, we investigate the acoustic topological insulator or topological metastructure, where an acoustic wave can exist only in an edge or interface state instead of propagating in bulk. Breaking the structural symmetry enables the opening of the Dirac cone in the band structure and the generation of a new band gap, wherein a topological edge or interface state ***, we systematically analyze two types of topological states that stem from the acoustic valley Hall effect mechanism;one type is confined to the boundary, whereas the other type can be observed at the interface between two topologically different structures. Results denote that the selection of different boundaries along with appropriately designed interfaces provides the acoustic waves in the band gap range with abilities of one-way propagation, dual-channel propagation, immunity from backscattering at sharp corners, and/or transition between propagation at interfaces and boundaries. Furthermore, we show that the acoustic wave propagation paths can be tailored in diverse and arbitrary ways by combing the two aforementioned types of topological states.

关键词： acoustic crystals valley Hall effect edge states interface states Dirac cone

A thermal actuated switchable dry adhesive with high reversibility for transfer printing

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International Journal of Extreme manufacturing 2021年第3期3卷 74-82页

作者： Shun Zhang Hongyu Luo Suhao Wang Zhou Chen Shuang Nie Changying Liu Jizhou Song Department of Engineering mechanics Soft Matter Research Centerand Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceZhejiang UniversityHangzhou 310027People’s Republic of China State key laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027People’s Republic of China

Transfer printing based on switchable adhesive that heterogeneously integrates materials is essential to develop novel electronic systems,such as flexible electronics and micro LED ***,we report a robust design of a thermal actuated switchable dry adhesive,which features a stiff sphere embedded in a thermally responsive shape memory polymer(SMP)substrate and encapsulated by an elastomeric *** construct bypasses the unfavorable micro-and nano-fabrication processes and yields an adhesion switchability of over1000 by combining the peel-rate dependent effect of the elastomeric membrane and the thermal actuation of the sub-surface embedded stiff *** and numerical studies reveal the underlying thermal actuated mechanism and provide insights into the design and operation of the switchable *** of this concept in stamps for transfer printing of fragile objects,such as silicon wafers,silicon chips,and inorganic micro-LED chips,onto challenging non-adhesive surfaces illustrate its potential in heterogeneous material integration applications,such as flexible electronics manufacturing and deterministic assembly.

关键词： switchable adhesive reversible adhesive transfer printing flexible electronics