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Rapid nanomolding of nanotopography on flexible substrates to control muscle cell growth with enhanced maturation

Microsystems & Nanoengineering 2021年第6期7卷 71-85页

作者： Cong Wu Chriss S.M.Chin Qingyun Huang Ho-Yin Chan Xinge Yu vellaisamy a.l.roy Wen J.li Department of Mechanical Engineering City University of Hong KongHong KongChina Department of Biomedical Engineering City University of Hong KongHong KongChina James Watt School of Engineering University of GlasgowGlasgow G128QQUK

In vivo,multiple biophysical cues provided by highly ordered connective tissues of the extracellular matrix regulate skeletal muscle cells to align in parallel with one ***,in routine in vitro cell culture environments,these key factors are often missing,which leads to changes in cell ***,we present a simple strategy for using optical media discs with nanogrooves and other polymer-based substrates nanomolded from the discs to directly culture muscle cells to study their response to the effect of biophysical cues such as nanotopography and substrate *** extend the range of study of biophysical cues for myoblasts by showing that they can sense ripple sizes as small as a 100 nm width and a 20 nm depth for myotube alignment,which has not been reported *** results revealed that nanotopography and substrate stiffness regulated myoblast proliferation and morphology independently,with nanotopographical cues showing a higher *** biophysical cues also worked synergistically,and their individual effects on cells were additive;i.e.,by comparing cells grown on different polymerbased substrates(with and without nanogrooves),the cell proliferation rate could be reduced by as much as~29%,and the elongation rate could be increased as much as~116%.Moreover,during myogenesis,muscle cells actively responded to nanotopography and consistently showed increases in fusion and maturation indices of~28%and~21%,***,under electrical stimulation,the contraction amplitude of well-aligned myotubes was found to be almost 3 times greater than that for the cells on a smooth surface,regardless of the substrate stiffness.

关键词： routine stimulation topography

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Current advancements on charge selective contact interfacial layers and electrodes in flexible hybrid perovskite photovoltaics

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Journal of Energy Chemistry 2021年第3期30卷 151-173页

作者： Gopalan Saianand Prashant Sonar Gregory J.Wilson Anantha-Iyengar Gopalan vellaisamy a.l.roy Gautam E.Unni Khan Mamun Reza Behzad Bahrami K.Venkatramanan Qiquan Qiao Global Centre for Environmental Remediation(CCER) Faculty of ScienceThe University of NewcastleCallaghan 2308New South WalesAustralia CSIRO Energy Newcastle Energy Centre10 Murray Dwyer CctMayfield WestNSW 2304Australia School of Chemistry and Physics Queensland University of Technology(QUT)2 George StreetBrisbaneQLD 4001Australia Centre for Material Science Queensland University of Technology(QUT)BrisbaneQLD 4000Australia Daegyeong Regional Infrastructure Technology Development Center Kyungpook National UniversityDaegu 41566Republic of Korea James Watt School of Engineering University of GlasgowG128QQUnited Kingdom Facufty of Engineering and Built Environment The University of NewcastleCallaghan 2308New South WalesAustralia Department of Electrical Engineering Center for Advanced PhotovoltaicsSouth Dakota State UniversityBrookings 57007South DakotaUSA Department of Physics SCSVMV Deemed UniversityKanchipuram 631561Tamil NaduIndia

Perovskite-based photovoltaic materials have been attracting attention for their strikingly improved performance at converting sunlight into *** beneficial and unique optoelectronic characteristics of perovskite structures enable researchers to achieve an incredibly remarkable power conversion *** hybrid perovskite photovoltaics promise emerging applications in a myriad of optoelectronic and wearable/portable device applications owing to their inherent intriguing physicochemical and photophysical properties which enabled researchers to take forward advanced research in this growing *** perovskite photovoltaics have attracted significant attention owing to their fascinating material properties with combined merits of high efficiency,light-weight,flexibility,semitransparency,compatibility towards roll-to-roll printing,and large-area mass-scale *** perovskite-based solar cells comprise of 4 key components that include a flexible substrate,semi-transparent bottom contact electrode,perovskite(light absorber layer)and charge transport(electron/hole)layers and top(usually metal)*** these components,interfacial layers and contact electrodes play a pivotal role in influencing the overall photovoltaic *** this comprehensive review article,we focus on the current developments and latest progress achieved in perovskite photovoltaics concerning the charge selective transport layers/electrodes toward the fabrication of highly stable,efficient flexible *** a concluding remark,we briefly summarize the highlights of the review article and make recommendations for future outlook and investigation with perspectives on the perovskite-based optoelectronic functional devices that can be potentially utilized in smart wearable and portable devices.

关键词： Perovskite photovoltaics Charge transport layers Contact interface layer Contact electrodes Printable electronics

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Triboelectric nanogenerator for neuromorphic electronics

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能源评论(英文) 2023年第1期2卷 16-30页

作者： Guanglong Ding Su-Ting Han vellaisamy a.l.roy Chi-Ching Kuo Ye Zhou Institute for Advanced Study Shenzhen UniversityShenzhen518060PR China College of Electronics and Information Engineering Shenzhen518060PR China James Watt School of Engineering University of GlasgowGlasgowG128QQUK Institute of Organic and Polymeric Materials Research and Development Center of Smart Textile TechnologyNational Taipei University of TechnologyTaipei10608TaiwanChina

Building the brain-inspired neural network computing system based neuromorphic electronics is an effective approach to break the von Neumann bottleneck on the hardware level and realize the information processing with high efficiency and low energy consumption in this big data explosion *** nanogenerator(TENG)has two functions of sensing and energy conversion,which promote the application as sensor and/or power supply in self-powered neuromorphic electronics for data storage and biological synapse/neuron behaviors *** article highlights the relevant works of TENGs for memory devices,artificial synapses and artificial neurons,performs a systematic comparison,and puts forward the future research possibilities and challenges,with the hope of attracting more researchers into this field and promoting the development of TENG based neuromorphic electronics.

关键词： Triboelectric nanogenerator Neuromorphic electronic Memory Artificial synapse Artificial neuron Tactile perception system

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Experimental study of 3D printed carbon fibre sandwich structures for lightweight applications

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Defence Technology（防务技术） 2024年第6期36卷 71-77页

作者： Solaiprakash vellaisamy Raguraman Munusamy Department of Mechanical Engineering Indian Institute of Information Technology Design and ManufacturingKancheepuramChennai600127India School of Interdisciplinary Design and Innovation Indian Institute of Information Technology Design and ManufacturingKancheepuramChennai600127India

Honeycomb sandwich structures are widely used in lightweight ***,these structures are subjected to extreme loading conditions,leading to potential failures due to delamination and debonding between the face sheet and the honeycomb ***,the present study is focused on the mechanical characterisation of honeycomb sandwich structures fabricated using advanced 3D printing *** continuous carbon fibres and ONYX-FR matrix materials have been used as raw materials for 3D printing of the specimens needed for various mechanical characterization testing;ONYX-FR is a commercial trade name for flame retardant short carbon fibre filled nylon filaments,used as a reinforcing material in Morkforged 3D *** and flatwise compression tests have been conducted for different configurations of honeycomb sandwich structures,fabricated by varying the face sheet thickness and core cell size,while keeping the core cell thickness and core height *** on these tests,the proposed structure with face sheet thickness of 3.2 mm and a core cell size of 12.7 mm exhibited the highest energy absorption and prevented delamination and debonding ***,3D printing technology can also be considered as an alternative method for sandwich structure ***,detailed parametric studies still need to be conducted to meet various other structural integrity criteria related to the lightweight applications.

关键词： 3D printed composite Honeycomb sandwich Edgewise compression Flatwise compression lightweight

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Nanowire-based synaptic devices for neuromorphic computing

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Materials Futures 2023年第2期2卷 94-108页

作者： Xue Chen Bingkun Chen Pengfei Zhao vellaisamy a.l.roy Su-Ting Han Ye Zhou Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060People’s Republic of China College of Physics and Optoelectronic Engineering Harbin Engineering UniversityHarbin 150001People’s Republic of China School of Science and Technology Hong Kong Metropolitan UniversityHong KongSARPeople’s Republic of China College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China Institute for Advanced Study Shenzhen UniversityShenzhen 518060People’s Republic of China

The traditional von Neumann structure computers cannot meet the demands of high-speed big data processing;therefore,neuromorphic computing has received a lot of interest in recent ***-inspired neuromorphic computing has the advantages of low power consumption,high speed and high *** human brains,the data transmission and processing are realized through *** synaptic devices can be adopted to mimic the biological synaptic ***(NW)is an important building block for nanoelectronics and optoelectronics,and many efforts have been made to promote the application of NW-based synaptic devices for neuromorphic ***,we will introduce the current progress of NW-based synaptic memristors and synaptic *** applications of NW-based synaptic devices for neuromorphic computing will be *** challenges faced by NW-based synaptic devices will be *** hope this perspective will be beneficial for the application of NW-based synaptic devices in neuromorphic systems.

关键词： nanowires synapse memristor transistor neuromorphic computing

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Experimental study of 3D printed carbon fi bre sandwich structures for lightweight applications

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Defence technology 2024年第6期 71页

作者： Solaiprakash vellaisamy Raguraman Munusamy

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Surface decoration of Halloysite nanotubes with POSS for fire-safe thermoplastic polyurethane nanocomposites

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Journal of Materials Science & Technology 2022年第6期101卷 107-117页

作者： Wei Wu Wanjing Zhao Xianjing Gong Qijun Sun Xianwu Cao Yujun Su Bin Yu Robert K.Y.li roy A.l.vellaisamy Department of Materials Science and Engineering City University of Hong KongTat Chee AvenueKowloonHong Kong SARChina National Engineering Research Center of Novel Equipment for Polymer Processing Key Laboratory of Polymer Processing Engineering of Ministry of EducationGuangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced ManufacturingSchool of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou 510640China National-certified Enterprise Technology Center Kingfa Science and Technology Co.Ltd.Guangzhou 510663China Centre for Future Materials University of Southern QueenslandToowoombaQueenslandAustralia James Watt School of Engineering University of GlasgowGlasgow G128QQUnited Kingdom

Halloysite nanotubes(HNTs)have been considered as a promising flame retardant fillers for *** this work,the polyhedral oligomericsilsesquioxane(POSS)containing amino group was covalently grafted on the surface of HNTs with 3-(2,3-epoxypropoxy)propytrimethoxysilane as a chemical *** POSS modified HNTs(HNTs-POSS)dispersed uniformly in the thermoplastic polyurethane(TPU)matrix and endowed TPU nanocomposites with enhanced tensile properties and fire *** calorimeter tests revealed that the introduction of 2 wt%HNTs-POSS to TPU matrix remarkably reduced the peak of heat release rate(PHRR)and total heat release(THR)by 60.0%and 18.3%,*** addition,the peak CO production rate and total smoke release(TSR)could be significantly suppressed by the addition of *** well dispersed HNTs in combination with the ceramified silicon network from the thermal decomposition of POSS contributed to the formation of a continuous and compact char layer,exhibiting a tortuous effect by inhibiting heat diffusion and evaporation of volatile *** addition,the released crystal water from HNTs could dilute the combustible volatiles and then decline the combustion *** tensile tests demonstrated that introduction of 2 wt%HNTs-POSS would enhance the maximum stress of TPU nanocomposite with a slight decrease of elongation at *** combination of HNTs and POSS through the construction of effective interfacial interactions provides a feasible way to effectively enhance the fire safety of TPU nanocomposites without scarifying ductility.

关键词： Thermoplastic polyurethane Halloysite nanotube POSS Flame retardancy Mechanical property

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Manufacturing of graphene based synaptic devices for optoelectronic applications

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International Journal of Extreme Manufacturing 2023年第4期5卷 150-177页

作者： Kui Zhou Ziqi Jia Xin-Qi Ma Wenbiao Niu Yao Zhou Ning Huang Guanglong Ding Yan Yan Su-Ting Han vellaisamy a.l.roy Ye Zhou Institute for Advanced Study Shenzhen UniversityShenzhen 518060People’s Republic of China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China School of Science and Technology Hong Kong Metropolitan UniversityHong Kong Special Administrative Region of ChinaPeople’s Republic of China James Watt School of Engineering University of GlasgowGlasgow G128QQUnited Kingdom

Neuromorphic computing systems can perform memory and computing tasks in parallel on artificial synaptic devices through simulating synaptic functions,which is promising for breaking the conventional von Neumann bottlenecks at hardware *** optoelectronic synapses enable the synergistic coupling between optical and electrical signals in synaptic modulation,which opens up an innovative path for effective neuromorphic *** the advantages of high mobility,optical transparency,ultrawideband tunability,and environmental stability,graphene has attracted tremendous interest for electronic and optoelectronic *** progress highlights the significance of implementing graphene into artificial synaptic ***,to better understand the potential of graphene-based synaptic devices,the fabrication technologies of graphene are first ***,the roles of graphene in various synaptic devices are ***,their typical optoelectronic applications in neuromorphic systems are ***,outlooks for development of synaptic devices based on graphene are *** review will provide a comprehensive understanding of graphene fabrication technologies and graphene-based synaptic device for optoelectronic applications,also present an outlook for development of graphene-based synaptic device in future neuromorphic systems.

关键词： graphene synaptic device memristor optoelectronic applications

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