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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

Application of silk fibroin coatings for biomaterial surface modification:a silk road for biomedicine

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Journal of zhejiang University-Science B(Biomedicine & Biotechnology) 2023年第11期24卷 943-956页

作者： Jinxing HU Zhiwei JIANG Jing ZHANG Guoli YANG Stomatology Hospital School of StomatologyZhejiang University School of MedicineZhejiang Provincial Clinical Research Center for Oral DiseaseKey Laboratory of Oral Biomedical Research of Zhejiang ProvinceCancer Center of Zhejiang UniversityEngineering Research Center of Oral Biomaterials and Devices of Zhejiang ProvinceHangzhou310000China

Silk fibroin(SF)as a natural biopolymer has become a popular material for biomedical applications due to its minimal immunogenicity,tunable biodegradability,and high ***,various techniques have been developed for the applications of SF in *** of the literature reviews focus on the SF-based biomaterials and their different forms of applications such as films,hydrogels,and *** is also valuable as a coating on other substrate materials for biomedicine;however,there are few reviews related to SF-coated ***,in this review,we focused on the surface modification of biomaterials using SF coatings,demonstrated their various preparation methods on substrate materials,and introduced the latest *** diverse applications of SF coatings for biomedicine are discussed,including bone,ligament,skin,mucosa,and nerve regeneration,and dental implant surface *** coating is conducive to inducing cell adhesion and migration,promoting hydroxyapatite(HA)deposition and matrix mineralization,and inhibiting the Notch signaling pathway,making it a promising strategy for bone *** addition,SF-coated composite scaffolds can be considered prospective candidates for ligament regeneration after *** coating has been proven to enhance the mechanical properties of the substrate material,and render integral stability to the dressing material during the regeneration of skin and ***,SF coating is a potential strategy to accelerate nerve regeneration due to its dielectric properties,mechanical flexibility,and angiogenesis promotion *** addition,SF coating is an effective and popular means for dental implant surface modification to promote osteogenesis around implants made of different ***,this review can be of great benefit for further improvements in SF-coated biomaterials,and will undoubtedly contribute to clinical transformation in the future.

关键词： Silk fibroin Coating Surface modification Notch signaling pathway

Regulation of Calcium on Peanut Photosynthesis Under Low Night Temperature Stress

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Journal of Integrative Agriculture 2013年第12期12卷 2172-2178页

作者： LIU Yi-fei HAN Xiao-ri ZHAN Xiu-mei YANG Jin-feng WANG Yu-zhi SONG Qiao-bo CHEN Xin National engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources/biochar engineering Technology research center of Liaoning province/College of Land and Environment Shenyang Agricultural University

The effects of different levels of CaCl 2 on photosynthesis under low night temperature（8°C） stress in peanuts were studied in order to find out the appropriate concentration of Ca2＋through the artificial climate chamber potted culture *** results indicated that Ca2＋,by means of improving the stomatal conductivity of peanut leaves under low night temperature stress,may mitigate the decline of photosynthetic rate in the peanut *** regulation with 15 mmol L-1CaCl 2（Ca15） was the most effective,compared with other ***,the improvement of Ca2＋on peanut photosynthesis under low night temperature stress was validated further through spraying with Ca15,Ca2＋chelator（ethylene glycol bis（2-aminoethyl） tetraacetic acid; EGTA） and calmodulin antagonists（trifluonerazine; TFP）.And CaM（Ca2＋-modulin） played an important role in the nutritional signal transduction for Ca2＋mitigating photosynthesis limitations in peanuts under low night temperature stress.

关键词： peanut Ca2+ low night temperature stress photosynthesis

Electromechanical modeling of eye fatigue detecting using flexible piezoelectric sensors

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Science China(Information Sciences) 2018年第6期61卷 87-94页

作者： Chaofeng LU Shuang WU Yangyang ZHANG Yangkun DU College of Civil engineering and Architecture Zhejiang University Key Laboratory of Soft Machines and Smart Devices of zhejiang province Zhejiang University Soft Matter research center Zhejiang University Department of engineering Mechanics Zhejiang University

Eye fatigue has attracted significant interest due to its potential harm to human daily activities. An ultrathin flexible piezoelectric sensor was currently designed and fabricated to detect eye fatigue by deforming together with the eyelid epidermis. Herein we develop a theoretical model to illustrate the correlation between the eyelid motion and the signals output by the piezoelectric sensor. The theoretical predictions on the eyelid motion based on the measured electrical output agree well with the in vivo observations in experiment. A simple scaling law is established to evaluate the impacts of different parameters on the function ability of the flexible piezoelectric sensor. The results may provide useful guidelines for designing and optimizing similar devices for alike biological motions.

关键词： electromechanical model flexible piezoelectric sensors eye fatigue monitoring scaling law micromechanics

Multimaterial Embedded 3D Printing of Composite Reinforced Soft Actuators

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research 2023年第4期2023卷 727-737页

作者： Zhenhua Wang Boyu Zhang Qu He Hao Chen Jizhe Wang Yuan Yao Nanjia Zhou Weicheng Cui Key Laboratory of Coastal Environment and Resources of zhejiang province School of EngineeringWestlake UniversityHangzhouZhejiang ProvinceChina Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhouZhejiang ProvinceChina research center for Industries of the Future and Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang ProvinceSchool of EngineeringWestlake UniversityHangzhouZhejiang ProvinceChina

Soft pneumatic actuators(SPAs)have attracted enormous attention in the growing field of *** different SPAs,composite reinforced actuators(CRAs)are widely used because of their simple structure and high ***,multistep molding,a time-consuming method,is still the predominant fabrication ***,we propose a multimaterial embedded printing method(ME3P)to fabricate *** comparison with other 3-dimensional printing methods,our method improves fabrication flexibility *** the design and fabrication of the reinforced composites’patterns and different geometries of the soft body,we demonstrate actuators with programmable responses(elongation,contraction,twisting,bending,and helical and omnidirectional bending).Finite element analysis is employed for the prediction of pneumatic responses and the inverse design of actuators based on specific actuation ***,we use tube-crawling robots as a model system to demonstrate our ability to fabricate complex soft robots for practical *** work demonstrates the versatility of ME3P for the future manufacturing of CRA-based soft robots.

关键词： composites composite printing

Two-dimensional equations for thin-films of ionic conductors

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Applied Mathematics and Mechanics(English Edition) 2018年第8期39卷 1071-1088页

作者： Shuting LU Chunli ZHANG Weiqiu CHEN Jiashi YANG Department of engineering Mechanics Zhejiang University Soft Matter research center Zhejiang University Key Laboratory of Soft Machines and Smart Devices of zhejiang province Zhejiang University Department of Mechanical and Materials engineering University of Nebraska-Lincoln

A theoretical model is developed for predicting both conduction and diffusion in thin-film ionic conductors or cables. With the linearized Poisson-Nernst-Planck(PNP)theory, the two-dimensional(2D) equations for thin ionic conductor films are obtained from the three-dimensional(3D) equations by power series expansions in the film thickness coordinate, retaining the lower-order equations. The thin-film equations for ionic conductors are combined with similar equations for one thin dielectric film to derive the 2D equations of thin sandwich films composed of a dielectric layer and two ionic conductor layers. A sandwich film in the literature, as an ionic cable, is analyzed as an example of the equations obtained in this paper. The numerical results show the effect of diffusion in addition to the conduction treated in the literature. The obtained theoretical model including both conduction and diffusion phenomena can be used to investigate the performance of ionic-conductor devices with any frequency.

关键词： ionic conduction and diffusion linearized Poisson-Nernst-Planck(PNP) theory two-dimensional(2D) equation ionic conductor thin-film

Complicated deformation simulating on temperature-driven 4D printed bilayer structures based on reduced bilayer plate model

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Applied Mathematics and Mechanics(English Edition) 2021年第11期42卷 1619-1632页

作者： Junjie SONG Yixiong FENG Yong WANG Siyuan ZENG Zhaoxi HONG Hao QIU Jianrong TAN State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China engineering research center for Design engineering and Digital Twin of zhejiang province Zhejiang UniversityHangzhou 310027China

The four-dimensional(4D) printing technology, as a combination of additive manufacturing and smart materials, has attracted increasing research interest in recent years. The bilayer structures printed with smart materials using this technology can realize complicated deformation under some special stimuli due to the material *** deformation prediction of bilayer structures can make the design process more rapid and thus is of great importance. However, the previous works on deformation prediction of bilayer structures rarely study the complicated deformations or the influence of the printing process on deformation. Thus, this paper proposes a new method to predict the complicated deformations of temperature-sensitive 4D printed bilayer structures,in particular to the bilayer structures based on temperature-driven shape-memory polymers(SMPs) and fabricated using the fused deposition modeling(FDM) technology. The programming process to the material during printing is revealed and considered in the simulation model. Simulation results are compared with experiments to verify the validity of the method. The advantages of this method are stable convergence and high efficiency,as the three-dimensional(3D) problem is converted to a two-dimensional(2D) *** simulation parameters in the model can be further associated with the printing parameters, which shows good application prospect in 4D printed bilayer structure design.

关键词： reduced bilayer plate model four-dimensional(4D)printing temperature-driven shape-memory polymer(SMP) bilayer structure complicated deformation simulating

Facet effects on bimetallic ZnSn hydroxide microcrystals for selective electrochemical CO_(2)reduction

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Green Energy & Environment 2024年第8期9卷 1314-1320页

作者： Liu Han Cheng-wei Wang Shan-shan Luo Ying-tang Zhou Bing Li Ming Liu School of Chemistry and Chemical engineering Harbin Institute of TechnologyHeilongjiang Province150000China National engineering research center for Marine Aquaculture Marine Science and Technology CollegeZhejiang Ocean UniversityZhoushanZhejiang Province316004China

Employing crystal facets to regulate the catalytic properties in electrocatalytic carbon dioxide reduction reaction(eCO_(2)RR)has been well demonstrated on electrocatalysts containing single metals but rarely explored for bimetallic ***,we synthesize ZnSn(OH)_(6)(ZSO)microcrystals(MCs)with distinct facets and investigate the facet effects in eCO_(2)*** studies and in situ Fourier Transform Infrared Spectroscopy(in situ-FTIR)reveal that ZSO MCs produce mainly C1 products of HCOOH and ***{111}facet of the ZSO MCS exhibits higher selectivity and faradaic efficiency(FE)than that of the{100}facet over a wide range of potentials(-0.9 V∼-1.3 V versus RHE).Density Functional Theory(DFT)calculations elucidate that the{111}facet is favorable to the adsorption/activation of CO_(2)molecules,the formation of intermediate in the rate-determining step,and the desorption of C1 products of CO and HCOOH molecules.

关键词： ZnSn(OH)_(6) Crystal facets Electrochemical carbon dioxide reduction C1 product Density functional theory

Development and accuracy of artificial intelligence-generated prediction of facial changes in orthodontic treatment:a scoping review

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Journal of zhejiang University-Science B(Biomedicine & Biotechnology) 2023年第11期24卷 974-984页

作者： Jiajun ZHU Yuxin YANG Hai Ming WONG Stomatology Hospital School of StomatologyZhejiang University School of MedicineZhejiang Provincial Clinical Research Center for Oral DiseasesKey Laboratory of Oral Biomedical Research of Zhejiang ProvinceCancer Center of Zhejiang UniversityEngineering Research Center of Oral Biomaterials and Devices of Zhejiang ProvinceHangzhou310000China Faculty of Dentistry The University of Hong KongHong KongChina

Artificial intelligence(AI)has been utilized in soft-tissue analysis and prediction in orthodontic treatment planning,although its reliability has not been systematically *** scoping review was conducted to outline the development of AI in terms of predicting soft-tissue changes after orthodontic treatment,as well as to comprehensively evaluate its prediction *** electronic databases(PubMed,EBSCOhost,Web of Science,Embase,Cochrane Library,and Scopus)were searched up to March 14,*** studies investigating the performance of AI-based systems in predicting post-orthodontic soft-tissue alterations were *** Quality Assessment of Diagnostic Accuracy Studies-2(QUADAS-2)and Joanna Briggs Institute(JBI)appraisal checklist for diagnostic test accuracy studies were applied to assess risk of bias,while the Grading of Recommendation,Assessment,Development,and Evaluation(GRADE)assessment was conducted to evaluate the certainty of *** screening 2500 studies,four non-randomized clinical trials were finally included for full-text *** found a low level of evidence indicating an estimated high overall accuracy of AI-generated prediction,whereas the lower lip and chin seemed to be the least predictable ***,the facial morphology simulated by AI via the fusion of multimodality images was considered to be reasonably *** all of the included studies that were not randomized clinical trials(non-RCTs)showed a moderate to high risk of bias,more well-designed clinical trials with sufficient sample size are needed in future work.

关键词： Facial morphology Soft-tissue changes Artificial intelligence(AI) Orthodontic treatment