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Nature-inspired surface topography: design and function

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Science China(Physics,Mechanics & Astronomy) 2020年第2期63卷 32-46页

作者： xiantong yan YuanKai Jin XueMei Chen Chao Zhang ChongLei Hao ZuanKai Wang Department of Mechanical Engineering City University of Hong KongHong Kong 999077China MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China

Learning from nature has traditionally and continuously provided important insights to drive a paradigm shift in *** particular,recent studies show that many biological organisms exhibit spectacular surface topography such as shape,size,spatial organization,periodicity,interconnectivity,and hierarchy to endow them with the capability to adapt dynamically and responsively to a wide range of *** excitingly,in a broader perspective,these normally neglected topological features have the potential to fundamentally change the way of how engineering surface works,such as how fluid flows,how heat is transported,and how energy is generated,saved,and converted,to name a ***,the design of nature-inspired surface topography for unique functions will spur new thinking and provide paradigm shift in the development of the new engineering *** this review,we first present a brief introduction to some insights extracted from ***,we highlight recent progress in designing new surface topographies and demonstrate their applications in emerging areas including thermal-fluid transport,anti-icing,water harvesting,power generation,adhesive control,and soft ***,we offer our perspectives on this emerging field,with the aim to stimulate new thinking on the development of next-generation of new materials and devices,and dramatically extend the boundaries of traditional engineering.

关键词： natural inspiration biomimetic surface topography surface engineering unique functions interfacial interaction mechanisms

SLIPS-TENG: robust triboelectric nanogenerator with optical and charge transparency using a slippery interface

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National Science Review 2019年第3期6卷 540-550页

作者： Wanghuai Xu Xiaofeng Zhou Chonglei Hao Huanxi Zheng Yuan Liu xiantong yan Zhengbao yang Michael Leung Xiao Cheng Zeng Ronald X.Xu Zuankai Wang Department of Mechanical Engineering City University of Hong Kong Department of Precision Machinery and Precision Instrumentation University of Science and Technology of China Shanghai Key Laboratory of Multidimensional Information Processing Department of Electronic Engineering East China Normal University Department of Chemistry University of Nebraska-Lincoln School of Energy and Environment City University of Hong Kong Department of Materials Science and Engineering City University of Hong Kong

Energy harvesting devices that prosper in harsh environments are highly demanded in a wide range of applications ranging from wearable and biomedical devices to self-powered and intelligent ***, over the past several years, the innovation of triboelectric nanogenerators(TENGs) that efficiently convert ambient kinetic energy of water droplets or wave power to electricity has received growing attention. One of the main bottlenecks for the practical implications of such devices originates from the fast degradation of the physiochemical properties of interfacial materials under harsh environments. To overcome these challenges, here we report the design of a novel slippery lubricant-impregnated porous surface(SLIPS) based TENG, referred to as SLIPS-TENG, which exhibits many distinctive advantages over conventional design including optical transparency, configurability, self-cleaning, flexibility, and power generation stability, in a wide range of working environments. Unexpectedly, the slippery and configurable lubricant layer not only serves as a unique substrate for liquid/droplet transport and optical transmission,but also for efficient charge transfer. Moreover, we show that there exists a critical thickness in the liquid layer, below which the triboelectric effect is almost identical to that without the presence of such a liquid film. Such an intriguing charge transparency behavior is reminiscent of the wetting transparency and van der Waals potential transparency of graphene previously reported, though the fundamental mechanism remains to be elucidated. We envision that the marriage of these two seemingly totally different arenas(SLIPS and TENG) provides a paradigm shift in the design of robust and versatile energy devices that can be used as a clean and longer-lifetime alternative in various working environments.

关键词： slippery surface triboelectricity power generation water droplet interfaces

Biophysical-driven piezoelectric and aligned nanofibrous scaffold promotes bone regeneration by re-establishing physiological electrical microenvironment

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Nano Research 2024年第8期17卷 7376-7393页

作者： Aoao Wang Xinbo Ma Yafeng yang Guoliang Shi Liwei Han xiantong Hu Rui Shi Jun yan Quanyi Guo yantao Zhao Senior Department of Orthopedics the Fourth Medical Center of PLA General HospitalBeijing 100048China Department of Chemistry Capital Normal UniversityBeijing 100048China National Center for Orthopaedics Beijing Research Institute of Traumatology and OrthopaedicsBeijing Jishuitan HospitalCapital Medical UniversityBeijing 100035China Xijing 986 Hospital Department The Fourth Military Medical UniversityXi'an 710032China Institute of Orthopedics Chinese PLA General HospitalBeijing Key Laboratory of Regenerative Medicine in OrthopedicsKey Laboratory of Musculoskeletal Trauma&War Injuries PLABeijing 100853China

The initial healing stages of bone fracture is a complex physiological process involving a series of spatially and temporally overlapping events,including pathogen clearance,immunological modulation,and *** this study,we have developed a piezoelectric and aligned nanofibrous scaffold composed of ZnO@PCL/PVDF with multiple antibacterial,immunomodulatory,and osteogenic effects using electrospinning *** scaffold’s piezoelectric signal output under ultrasound(US)control can be similar to the physiological electrical signals of healthy bone tissue,creating a truly biomimetic electrical microenvironment in the bone *** vitro studies have shown that ZnO@PCL/PVDF scaffold significantly enhances the proliferation,migration,and osteogenic differentiation of MC3T3-E1 cells under piezoelectric drive provided by ***,the scaffold exhibits inhibitory effects on the growth of *** and ***,as well as the ability to induce M2 macrophage polarization,indicating potent antibacterial and immunomodulatory *** vivo experiments demonstrated that the ZnO@PCL/PVDF scaffold can accelerate the repair of mandibular defects in rats,effectively inhibit bacterial colonization,and reduce inflammatory ***,this study confirms that the newly developed ZnO@PCL/PVDF scaffold effectively promotes bone repair by truly mimicking the endogenous electrical microenvironment and precisely regulating the temporospatial disorders of initial bone healing,thus providing a simple and effective solution for bone defects.

关键词： piezoelectricity bone defect bacterial infection ZnO nanoparticles immunomodulation osteogenesis

Achieving ultra-stable and superior electricity generation by integrating transistor-like design with lubricant armor

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The Innovation 2022年第5期3卷 122-128页

作者： Yuxin Song Wanghuai Xu Yuan Liu Huanxi Zheng Miaomiao Cui Yongsen Zhou Baoping Zhang xiantong yan Lili Wang Pengyu Li Xiaote Xu Zhengbao yang Zuankai Wang Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Research Center for Nature-Inspired Engineering City University of Hong KongHong Kong 999077China Shenzhen Research Institute of City University of Hong Kong Shenzhen 518057China School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China

Extensive work have been done to harvest untapped water energy in formats of raindrops,flows,waves,and ***,attaining stable and efficient electricity generation from these low-frequency water kinetic energies at both individual device and large-scale system level remains challenging,partially owing to the difficulty in designing a unit that possesses stable liquid and charge transfer properties,and also can be seamlessly integrated to achieve preferential collective performances without the introduction of tortuous wiring and redundant node connection with external ***,we report the design of water electricity generators featuring the combination of lubricant layer and transistor-like electrode architecture that endows enhanced electrical performances in different working *** a design is scalable in manufacturing and suitable for facile integration,characterized by significant reduction in the numbers of wiring and nodes and elimination of complex interfacing problems,and represents a significant step toward large-scale,real-life applications.

关键词： integrating collective electricity

Effect of Aerosol Particles on Orographic Clouds:Sensitivity to Autoconversion Schemes

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Advances in Atmospheric Sciences 2020年第2期37卷 229-238页

作者： Hui XIAO yan YIN Pengguo ZHAO Qilin WAN xiantong LIU Guangzhou Institute of Tropical and Marine Meteorology China Meteorological AdministrationGuangzhou 510641China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjing 210044China College of Atmospheric Science Chengdu University of Information&TechnologyChengdu 610225China

Aerosol particles can serve as cloud condensation nuclei(CCN)to influence orographic ***,which describes the initial formation of raindrops from the collision of cloud droplets,is an important process for aerosol-cloud-precipitation *** this study,seven autoconversion schemes are used to investigate the impact of CCN on orographic warm-phase *** the initial cloud droplet concentration is increased from 100 cm^(-3)to 1000 cm^(-3)(to represent an increase in CCN),the cloud water increases and then the rainwater is suppressed due to a decrease in the autoconversion rate,leading to a spatial shift in surface *** of the results from the autoconversion schemes show that the sensitivity of cloud water,rainwater,and surface precipitation to a change in the concentration of CCN is different from scheme to *** particular,the decrease in orographic precipitation due to increasing CCN is found to range from-87%to-10%depending on the autoconversion ***,the surface precipitation distribution also changes significantly by scheme or CCN concentration,and the increase in the spillover(ratio of precipitation on the leeward side to total precipitation)induced by increased CCN ranges from 10%to 55%under different autoconversion *** simulations suggest that autoconversion parameterization schemes should not be ignored in the interaction of aerosol and orographic cloud.

关键词： orographic cloud precipitation autoconversion aerosol particles

由整数有限域矩阵方程实现的数字图像分存技术

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赣南师范学院学报 2013年第3期34卷 56-59页

作者：严深海黄贤通赣南师范学院数学与计算机科学学院江西赣州341000

基于整数有限域矩阵方程的两类矩阵的唯一解求解问题,结合能实现秘密共享的Differ-Hellman协议,设计了一种数字图像分存方案,数值实验实现了灰度值图像及彩色图像的分存和重构.

关键词：有限域整数矩阵方程 Differ-Hellman协议图像分存

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由一类整数矩阵方程组实现的新密码体系

数学理论与应用 2017年第2期37卷 60-64页

作者：黄贤通谷田叶严深海赣南师范学院现代教育技术中心赣州341000 石家庄工程职业学院基础课部石家庄050000 赣南师范学院数学与计算机科学学院赣州341000

本文基于一类整数有限域矩阵方程组的唯一解求解,结合可以实现秘密共享的Differ-Hellman协议,设计一类由整数矩阵方程组实现的新密码体系,并用数值实验验证新密码体系应用的可行性和正确性.

关键词：有限域整数矩阵方程秘密共享协议密码体系

由有限域整数矩阵方程实现的通信三方密码体系

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数学理论与应用 2015年第4期35卷 80-85页

作者：谷田叶严深海黄贤通赣南师范学院数学与计算机科学学院江西赣州341000

基于一类有限域整数矩阵方程的唯一求解问题,结合能实现秘密共享的Differ-Hellman协议,设计了通讯三方密码体系,数值实验验证了新密码体系及应用的可行性和正确性.

关键词：有限域整数矩阵方程组秘密共享协议密码体系

华南一次典型雷暴过程双偏振雷达参量与闪电活动关系研究

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热带气象学报 2021年第3期37卷 427-438页

作者：杜赛刘显通孙皓霆陈绍东陈绿文颜旭中国气象局广州热带海洋气象研究所广东广州510641 海珠区气象局广东广州510220

基于2017年5月8日华南地区一次典型飑线过程,分析了此次过程中闪电活动和-35~0℃温度层内双偏振雷达参量的分布特征以及双偏振雷达参量与闪电活动之间的关系。结果表明:此次飑线过程中,双偏振雷达参量与闪电频次的趋势在时间变化上有较... 详细信息

基于2017年5月8日华南地区一次典型飑线过程,分析了此次过程中闪电活动和-35~0℃温度层内双偏振雷达参量的分布特征以及双偏振雷达参量与闪电活动之间的关系。结果表明:此次飑线过程中,双偏振雷达参量与闪电频次的趋势在时间变化上有较好的一致性,且随着闪电活动的发生及雷暴过程的增强,双偏振雷达参量中的冰水含量、雷达反射率因子、差分反射率、差分相移率等偏振参量都有不同程度的增加,闪电频次高峰时间段对应各个参量最大值时间段。双偏振雷达各个参量最大值与闪电活动的线性拟合关系均优于多项式拟合关系。定性地发现了双偏振雷达参量与闪电活动的关系,可为将来将双偏振雷达参量加入到闪电临近预警预报提供一定的参考依据。

关键词：双偏振雷达雷达参量飑线闪电活动闪电临近预警