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Dispersion of“guava-like”silica/polyacrylate nanocomposite particles in polyacrylate matrix

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Frontiers of Chemical Science and Engineering 2008年第2期2卷 127-134页

作者： Dongming QI Minghua WU Lei YANG Jianzhong SHAO Yongzhong BAO key laboratory of advanced Textile Materials and manufacturing technology Ministry of EducationZhejiang Sci-Tech UniversityHangzhou 310018China State key laboratory of Chemical Engineering Zhejiang UniversityHangzhou 310027China

A series of“guava-like”silica/polyacrylate nanocomposite particles with close silica content and different grafting degrees were prepared via mini-emulsion polymerization using 3-(trimethoxysilyl)propyl methacrylate(TSPM)modified silica/acrylate *** silica/polyacrylate composite particles were melt-mixed with unfilled polyacrylate(PA)resin to prepare corresponding silica/polyacrylate molded composites and the dispersion mechanism of these silica particles from the“guava-like”composite particles into polyacrylate matrix was *** was calculated that about 110 silica particles were accumulated in the bulk of every silica/polyacrylate composite latex *** the solubility tests of silica/polyacrylate composite latex particles in tetrahydrofuran(THF)and the section transmission electron microscope(TEM)micrographs of silica/polyacrylate molded composites indicated that the grafting degree of silica particles played a crucial role in the dispersion of silica/polyacrylate composite particles into the polyacrylate *** the grafting degree of polyacrylate onto silica was in a moderate range(ca.20%-70%),almost all of silica particles in these“guava-like”composite particles were dispersed into the polyacrylate matrix in a ***,at a lower grafting degree,massive silica aggregations were found in molded composites because of the lack of steric *** a greater grafting degree(i.e.,200%),a cross-linked network was formed in the silica/polyacrylate composite particles,which prevented the dispersion of composite particles in THF and polyacrylate matrix as primary particles.

关键词： silica polyacrylate nanocomposite dispersion

Application of defin让ive screening design to quantify the effects of process parameters on key granule characteristics and optimize operating parameters in pulsed-spray fluid-bed granulation

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Particuology 2019年第2期17卷 56-65页

作者： Jie Zhao Wenlong Li Haibin Qu Geng Tian Yanding Wei Pharmaceutical Informatics Institute College of Pharmaceutical Sciences Zhejiang University Hangzhou 310058 China key laboratory of advanced manufacturing technology of zhejiang province College of Mechanical Engineering Zhejiang University Hangzhou 310027 China

The pulsed-spray fluid-bed granulation (PSFBG) process was investigated and optimized using definitive scree ning design, a recently proposed new class of three-level desig n of experiment method. Such a design enabled quadratic models to be established that described the effect of six in put process parameters - inlet air temperature, inlet air humidity, binder spray rate, atomization pressure, pulse period, and pulse width - on the granule quality in a PSFBG process. Mathematical models of the mean particle size, relative size distribution width, production yield, and porosity were developed to quantify the relationships between the in flue ncing factors and critical quality attributes. On the basis of con strai nts on the desired granule properties, a design space for PSFBG was determined and ranges of the operating parameters were defined. An acceptable degree of prediction was confirmed by validation experiments, demonstrating the reliability and effectiveness of using definitive screening design to study the PSFBG process. This method can accelerate screening and optimization of this process within a large multidimensional design space.

关键词： Pulsed-spray fluid-bed granuiation Design of experiment Definitive screening design Mathematical models Design space Process parameters

Editing the Shape Morphing of Monocomponent Natural Polysaccharide Hydrogel Films

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Research 2021年第1期2021卷 835-846页

作者： Hao Hu Chao Huang Massimiliano Galluzzi Qiang Ye Rui Xiao Xuefeng Yu Xuemin Du Institute of Biomedical&Health Engineering Shenzhen Institute of Advanced Technology(SIAT)Chinese Academy of Sciences(CAS)Shenzhen 518035China key laboratory of Polymeric Materials and Application technology of Hunan province Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of EducationSchool of ChemistryXiangtan UniversityXiangtan 411105China Institute of advanced Materials Science and Engineering Shenzhen Institute of Advanced Technology(SIAT)Chinese Academy of Sciences(CAS)Shenzhen 518035China State key laboratory of Fluid Power&Mechatronic System Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceDepartment of Engineering MechanicsZhejiang UniversityHangzhou 310027China

Shape-morphing hydrogels can be widely used to develop artificial muscles,reconfigurable biodevices,and soft ***,conventional approaches for developing shape-morphing hydrogels highly rely on composite materials or complex manufacturing techniques,which limit their practical ***,we develop an unprecedented strategy to edit the shape morphing of monocomponent natural polysaccharide hydrogel films via integrating gradient cross-linking density and geometry *** to the synergistic effect,the shape morphing of chitosan(CS)hydrogel films with gradient cross-linking density can be facilely edited by changing their geometries(length-to-width ratios or thicknesses).Therefore,helix,short-side rolling,and longside rolling can be easily ***,various complex artificial 3D deformations such as artificial claw,horn,and flower can also be obtained by combining various flat CS hydrogel films with different geometries into one system,which can further demonstrate various shape transformations as triggered by *** work offers a simple strategy to construct a monocomponent hydrogel with geometry-directing programmable deformations,which provides universal insights into the design of shape-morphing polymers and will promote their applications in biodevices and soft robotics.

关键词： effect linking geometry

Nondestructive identification of softness via bioinspired multisensory electronic skins integrated on a robotic hand

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npj Flexible Electronics 2022年第1期6卷 479-488页

作者： Ye Qiu Shenshen Sun Xueer Wang Kuanqiang Shi Zhiqiang Wang Xiaolong Ma Wenan Zhang Guanjun Bao Ye Tian Zheng Zhang Hao Ding Hao Chai Aiping Liu Huaping Wu College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310023China key laboratory of Special Purpose Equipment and advanced Processing technology Ministry of Education and Zhejiang ProvinceZhejiang University of TechnologyHangzhou 310023China Collaborative Innovation Center of High-end Laser manufacturing Equipment(National“2011 Plan”) Zhejiang University of TechnologyHangzhouChina College of Information Engineering Zhejiang University of TechnologyHangzhou 310023China Zhijiang College of zhejiang University of technology Shaoxing 312030China Center for Optoelectronics Materials and Devices Zhejiang Sci-Tech UniversityHangzhou 310018China

Tactile sensing is essentially required for dexterous manipulation in robotic *** human perception of softness identification in a non-invasive fashion,thus achieving satisfactory interaction with fragile objects remains a grand ***,a scatheless measuring methodology based on the multisensory electronic skins to quantify the elastic coefficient of soft materials is *** recognition approach lies in the preliminary classification of softness by piezoelectric signals with a modified machine learning algorithm,contributing to an appropriate contact force assignment for subsequent quantitative measurements via strain sensing *** integration of multifunctional sensing system allows the manipulator to hold capabilities of selfsensing and adaptive grasping motility in response to objects with the various softness(i.e.,kPa-MPa).As a proof-of-concept demonstration,the biomimetic manipulator cooperates with the robotic arm to realize the intelligent sorting of oranges varying in freshness,paving the way for the development of microsurgery robots,human-machine interfacing,and advanced prosthetics.

关键词： robotic electronic orange

A novel metal-ceramic composite combining the structures of nacre and nanofiber reinforced foam

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Journal of Materials Science & technology 2023年第26期157卷 189-199页

作者： Guodong Shi Zhanjun Wu Hengli Wang State key laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116024China key laboratory of advanced technology for Aerospace Vehicles Liaoning ProvinceDalian University of TechnologyDalian 116024China

Lightweight high-strength and tough composites have enormous potentials in a multitude of fields in-cluding biomaterials,sporting goods,aerospace and automobile ***,we present a strat-egy to develop a novel bulk Al/SiC composite with a nacre/foam hybrid structure to combine excellent lightweight of foams with outstanding strength and toughness of *** reduce the adverse effect of foam pores on mechanical properties,we further propose to strengthen the foams with 3D nanofiber networks,obtaining a nacre/nanofiber reinforced foam ***,new particle-bubble co-assembly and selective infiltration technologies are proposed to prepare the novel nacre/foam and nacre/nanofiber reinforced foam *** nacre/nanofiber reinforced foam composite shows greater specific strength and toughness than the nacre/foam composite,conventional dense Al/SiC composites and many engineering *** approach opens a promising new avenue for the structure design and manufacturing of lightweight,high-performance structural materials.

关键词： Nanofiber reinforced foams Nacre-mimetic Microstructure Mechanical properties Freeze-casting Metal-ceramic composites

Framework of automated value stream mapping for lean production under the Industry 4.0 paradigm

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Journal of zhejiang University-Science A(Applied Physics & Engineering) 2021年第5期22卷 382-395页

作者： Hao-nan WANG Qi-qi HE Zheng ZHANG Tao PENG Ren-zhong TANG State key laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China key laboratory of 3D Printing Process and Equipment of zhejiang province Zhejiang UniversityHangzhou 310027China key laboratory of advanced manufacturing technology of zhejiang province Zhejiang UniversityHangzhou 310027China

For efficient use of value stream mapping(VSM)for multi-varieties and small batch production in a data-rich environment enabled by Industry 4.0 technologies,a systematic framework of VSM to rejuvenate traditional lean tools is *** addresses the issue that traditional VSM requires intensive on-site investigation and replies on experience,which hinders decisionmaking efficiency in dynamic and complex *** proposed framework follows the data-information-knowledge hierarchy model,and demonstrates how data can be collected in a production workshop,processed into information,and then interpreted into *** this paper,the necessity and limitations of VSM in automated root cause analysis are first discussed,with a literature review on lean production tools,especially VSM and VSM-based decision making in Industry *** implementation case of a furniture manufacturer in China is presented,where decision tree algorithm was used for automated root cause *** results indicate that automated VSM can make good use of production data to cater for multi-varieties and small batch production with timely on-site waste identification and *** proposed framework is also suggested as a guideline to renew other lean tools for reliable and efficient decision-making.

关键词： Value stream mapping(VSM) Root cause analysis Automated decision-making Lean production tools Industry 4.0

Gradient Wetting Transition from the Wenzel to Robust Cassie-Baxter States along Nanopillared Cicada Wing and Underlying Mechanism

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Journal of Bionic Engineering 2020年第5期17卷 1009-1018页

作者： Heng Xie Hanxiong Huang lab for Micro Molding and Polymer Rheology Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing and Key Laboratory of Polymer Processing Engineering(Ministry of Education)South China University of TechnologyGuangzhou 510640China

Gradient wettability is important for some living ***,the dynamic responses of water droplets impacting on the surfaces of four regions along the wing vein of cicada Cryptotympana atratafabricius are *** is revealed that a gradient wetting behavior from hydrophilicity(the Wenzel state)to hydrophobicity and further to superhydrophobicity(the Cassie-Baxter state)appears from the foot to apex of the *** droplets impacting on the hydrophilic region of the wing cannot rebound,whereas those impacting on the hydrophobic region can retract and completely *** hydrophobic region exhibits robust water-repelling performance during the dynamic droplet ***,a droplet sitting on the hydrophobic region can recover its spherical shape after squeezed to a water film as thin as 0.45 mm,and lossless droplet transportation can be achieved at the *** on the geometric parameters of the nanopillars at the hydrophilic and hydrophobic regions on the cicada wing,two wetting models are developed for elucidating the mechanism for the gradient wetting *** work directs the design and fabrication of surfaces with gradient wetting behavior by mimicking the nanopillars on cicada wing surface.

关键词： cicada wing nanopillared surface biomimetic gradient wetting transition dynamic wetting behavior

双跨转子的随机不确定性非参数建模与可靠性分析（英文）

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Journal of zhejiang University-Science A(Applied Physics & Engineering) 2018年第3期19卷 189-202页

作者： Chun-biao GAN Yue-hua WANG Shi-xi YANG State key laboratory of Fluid Power and Mechatronic Systems College of Mechanical Engineering Zhejiang University Hangzhou 310027 China key laboratory of advanced manufacturing technology of zhejiang province College of Mechanical Engineering Zhejiang University Hangzhou 310027 China

目的:旋转机械由于工作环境复杂,在运行过程中会不可避免地受到各种不确定性因素的影响,从而引发转子系统的异常振动。因此,迫切需要对系统工作状态开展可靠性分析。本文将外部扰动不确定性与模型不确定性考虑在内,旨在建立转子系统运... 详细信息

目的:旋转机械由于工作环境复杂,在运行过程中会不可避免地受到各种不确定性因素的影响,从而引发转子系统的异常振动。因此,迫切需要对系统工作状态开展可靠性分析。本文将外部扰动不确定性与模型不确定性考虑在内,旨在建立转子系统运行状态的可靠性评估指标,丰富转子动力学理论体系,为工程应用提供参考。创新点:1.采用非参数法进行建模,能够将外部扰动不确定性与模型不确定性同时包含在内;2.在非参数建模基础上,结合响应谱分析法进行可靠性计算,可避免对系统先验知识的需求并降低计算过程的复杂性;3.将短周期预测理论扩展应用于可靠性分析验证。方法:1.借助非参数法建立转子系统的随机不确定性模型;2.结合响应谱分析法推导出系统可靠性指标计算式;3.采用短周期预测方法对模拟数据统计指标进行计算与验证。结论:1.本方法可用于评估大型复杂旋转机械系统的可靠性,尤其对于服役时间较长导致系统参数出现不确定性变化的情形;2.本研究结果可为大型复杂旋转机械的设计、运行和控制提供理论基础,同时也可以为其他类型机械设备的可靠性分析和预测方法提供参考。

关键词：随机不确定性非参数建模可靠性响应谱分析

Tunable patterning of microscale particles using a surface acoustic wave device with slanted-finger interdigital transducers

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Journal of zhejiang University-Science A(Applied Physics & Engineering) 2021年第5期22卷 331-343页

作者： Yan-cheng WANG Cheng-yao XU De-qing MEI Jia-wei LIU State key laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China key laboratory of advanced manufacturing technology of zhejiang province Zhejiang UniversityHangzhou 310027China School of Mechanical Engineering Zhejiang UniversityHangzhou 310027China

Polymer-based materials with patterned functional particles have been used to develop smart devices with multiple *** paper presents a novel method to pattern microscale particles into biocompatible polyethylene glycol diacrylate(PEGDA)fluid through a designed surface acoustic wave(SAW)device with slanted-finger interdigital transducers(SFITs).By applying signals of different frequencies,the SFITs can excite SAWs with various wavelengths to pattern the microscale *** structural design and working principle of the SAW device with SFITs are firstly *** investigate the generation of standing SAWs and pressure field distributions of the SAW device with SFITs,a numerical model was *** results showed that different strip-shape patterned pressure fields can be generated,and the period and width of adjacent strips can be adjusted by changing the frequencies of the excitation *** were performed to verify that the microscale particles in the PEGDA solution can be successfully patterned into strip-shape patterns with various positions,periods,and *** results obtained in this study demonstrate that the developed method of using an SAW device with SFITs can be used for tunable patterning of microscale particles in solutions,and shows great potential for biomedical and microfluidic applications.

关键词： Tunable patterning Surface acoustic wave(SAW) Acoustic pressure field Polymer-based composite Slanted-finger interdigital transducers(SFITs)