检索结果-南通市图书馆

Unidirectional transport of both wettable and nonwettable liquids on an asymmetrically concave structured surface

Fundamental Research 2024年第3期4卷 557-562页

作者： Zhongxue Tang Kang Luan Bojie Xu Huan Liu Research Institute for Frontier Science School of PhysicsBeihang UniversityBeijing 100191China Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityHaidian DistrictBeijing 100191China

Unidirectional liquid transport(UDLT)has been widely used in various fields as an important process for transferring both mass and energy.However,UDLT driven by a structural gradient has been witnessed for a long time only in wettable liquids.For nonwettable liquids,UDLT can hardly proceed merely by a structural gradient.Herein,we propose an asymmetrically concave structured surface(AMC-surface),featuring tip-to-base periodically arranged pyramid-shaped concave structures with a certain degree of overlap,which enables the UDLT of both wettable and nonwettable liquids.For wettable liquids,the capillary force along each corner leads to the UDLT pointing toward the base side of the concave pyramid,while for nonwettable liquids,the UDLT is attributable to the static liquid pressure overwhelming the repulsive Laplace pressure induced by the asymmetric grooves and overlapping part.As a result,both wettable and nonwettable liquids transport spontaneously and unidirectionally on the AMC-surface with no energy input.Moreover,the concave structure endows good mechanical stability and can be easily prepared using a facile nail-punching approach over a large area.We also demonstrated its application in a continuous chemical reaction in a confined area.We envision that the unique UDLT behavior on the as-developed AMC-surface will shed new light on the programmable manipulation of various liquids.

关键词： Unidirectional liquidtransport Asymmetrically concave structure capillary force Laplace pressure Wettability

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Highly stable,stretchable,and transparent electrodes based on dualheaded Ag@Au core-sheath nanomatchsticks for non-enzymatic glucose biosensor

引用

Nano Research 2023年第1期16卷 1558-1567页

作者： Yangyang Wang Jingyi Kong Ruifang Xue Jianping Wang Min Gong Xiang Lin Liang Zhang Dongrui Wang School of Chemistry and Biological Engineering University of Science and Technology BeijingBeijing 100083China

Stretchable and transparent electrodes(STEs)based on silver nanowires(AgNWs)have garnered considerable attention due to their unique optoelectronic features.However,the low oxidation resistance of AgNWs severely limits the reliability and durability of devices based on such STEs.The present work reports a type of core-sheath silver@gold nanowires(Ag@Au NWs)with a morphology resembling dual-headed matchsticks and an average Au sheath thickness of 2.5 nm.By starting with such Ag@Au NWs,STEs with an optical transmittance of 78.7%,a haze of 13.0%,a sheet resistance of 13.5Ω·sq.−1,and a maximum tensile strain of 240%can be formed with the aid of capillary-force-induced welding.The resultant STEs exhibit exceptional oxidation resistance,high-temperature resistance,and chemical/electrochemical stability owing to the conformal and dense Au sheath.Furthermore,non-enzymatic glucose biosensors are fabricated employing the Ag@Au NW STEs.The electrocatalytic oxidation currents are proportional to glucose concentrations with a high sensitivity of 967μA·mM−1·cm−2 and a detection limit of 125μM over a detection range of 0.6 to 16 mM.Additionally,the biosensors demonstrate an appealing robustness and antiinterference characteristics,high repeatability,and great stability that make them adequate for practical use.

关键词： Ag@Au core-sheath nanowire stretchable transparent electrode glucose biosensor capillary force stretchable electronics

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agglomeration behavior of alumina inclusions and calcium aluminate inclusions on molten nickel-based superalloy surface

引用

Journal of Iron and Steel Research(International) 2023年第11期30卷 2318-2327页

作者： Rui-zhi Gao Lin-zhu Wang Chao-yi Chen Shu-feng Yang Xiang Li Yin Zhang School of Materials and Metallurgy Guizhou UniversityGuiyang550025GuizhouChina School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China Department of Materials and Metallurgy Engineering Guizhou Institute of TechnologyGuiyang550003GuizhouChina

Understanding the interactive forces of inclusions on the surface of molten nickel-based superalloys and finding methods to disperse these inclusions help improve performance and service life.The aggregation behavior of aluminum oxide(Al_(2)O_(3))and calcium aluminate inclusions with different sizes and spacings on the surface of molten nickel-based superalloys was observed in-situ using a high-temperature confocal laser scan microscope.The attractive force acted on Al2O3 inclusions with radii of 3.5-6μm was found ranging from 6.2×10-18 to 3.6×10-15 N,and that of CaO·2Al2O3(CA2)inclusions with radii of 3-5.5μm ranging from 3.5×10-19 to 8.3×10-15 N.The capillary force acted on inclusions on the surface of nickel-based superalloy was calculated based on the Kralchevsky-Paunov model and investigated as a function of inclusion size,spacing,and composition.The calculated results were in the same trend as the experimental results.The capillary force acted on inclusions was also affected by their contact angle,the density,surface energy,and oxygen content of the molten alloy.It decreased with increasing alloy density and decreasing contact angle between inclusion with alloy.Thus,the attractive force acted on Al2O3 inclusions was smaller on the surface of molten nickel-based superalloy than that of molten steel.Decreasing the oxygen content in the molten nickel-based alloy could increase its surface energy,and the attractive force acted on the inclusions would decrease.When the oxygen content in the molten nickel-based alloy decreased from 0.05 to 0.0001 wt.%,the capillary force acted on the Al2O3 inclusions decreased from 1.7×10-18 to 3.6×10-19 N,reduced by 79%(1.4×10-18 N).

关键词： Inclusion Nickel-based superalloy capillary force Alumina Calcium aluminate

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Experimental simulation of capillary effect on rough flat surfaces

引用

Particuology 2022年第1期20卷 115-123页

作者： Ziwen Zuo Junfeng Wang Yuanping Huo Dongbao Wang Hongbing Ji Institute for Energy Research Jiangsu UniversityZhenjiang 212013China School of Energy and Power Engineering Jiangsu University.Zhenjiang 212013China Fine Chemical Industry Research Institute School of ChemistrySun Yat-sen UniversityGuangzhou 510275China

The movement of the liquid column inside the slit was utilized to experimentally simulate the characteristics of the capillary force per unit length for different rough flat surfaces.The movement of the liquid column was achieved by continuously changing the slit interval.The maximum climb height and contact angle of the liquid column were observed during this process to study the relationship between capillary force and contact surface roughness.Based on the assumption that the microstructures on the rough surfaces are of the same form and continuously and uniformly distributed,it is shown that the capillary force per unit length under homogeneous wetting is independent of the roughness.For heterogeneous wetting,the capillary force per unit length is positively correlated with the roughness.The results also indicate that the appearance of"contact line pinning"is caused by insufficient capillary force along the direction of liquid column movement.

关键词： Contact angle Contact line capillary force Rough surfaces

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Influence of atomic force microscope(AFM) probe shape on adhesion force measured in humidity environment

引用

Applied Mathematics and Mechanics(English Edition) 2014年第5期35卷 567-574页

作者：阳丽涂育松谭惠丽 College of Physics Science and Technology Guangxi Normal University Institute of Systems Biology Shanghai University

In micro-manipulation, the adhesion force has very important influence on behaviors of micro-objects. Here, a theoretical study on the effects of humidity on the adhesion force is presented between atomic force microscope （AFM） tips and substrate. The analysis shows that the precise tip geometry plays a critical role on humidity depen- dence of the adhesion force, which is the dominant factor in manipulating micro-objects in AFM experiments. For a blunt （paraboloid） tip, the adhesion force versus humidity curves tends to the apparent contrast （peak-to-valley corrugation） with a broad range. This paper demonstrates that the abrupt change of the adhesion force has high correla- tion with probe curvatures, which is mediated by coordinates of solid-liquid-vapor contact lines （triple point） on the probe profiles. The study provides insights for further under- standing nanoscale adhesion forces and the way to choose probe shapes in manipulating micro-objects in AFM experiments.

关键词： capillary force van der Waals force adhesion force curvatures probe shape,

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mechanisms Underlying the Biological WetAdhesion:Coupled Effects of Interstitial Liquid and Contact Geometry

引用

Journal of Bionic Engineering 2020年第3期17卷 448-456页

作者： Jing Li Jun Liu Chuandong Ma Jiaxin Ji Jianlin Liu College of Mechanical and Electrical Engineering China University of Petroleum(East China)Qingdao 266580China College of Pipeline and Civil Engineering China University of Petroleum(East China)Qingdao 266580China

Wet adhesion is widely adopted in biological adhesion systems in nature,and it is beneficial to design new materials with desired properties based on the underlying physics of wet adhesion.The aim of this work is to develop a design criterion to regulate the wet adhesion.The effects of different contact shapes(flat and sphere)and morphologies of the substrate(smooth,microstructure and nanostructure)on the adhesion force are investigated.Combining with the theoretical models,the dominated factors in the separation process and isolating the viscous contributions from the capillary interactions are evaluated.The results demonstrate that the adhesion mechanisms depend significantly on the capillary numbers of the interstitial liquid and the contact geometry,and the ratio of capillary force to viscous force is a key to regulate the wet adhesion mechanism.These findings can not only explain some phenomena of wet adhesion to organisms,but also provide some inspirations to design new adhesion technology for robotic fingers that can grasp objects in wet environments.

关键词： wet adhesion capillary force viscous force adhesion mechanism

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Interfacial self-transportation via controlled wettability transition for directed self-assembly

引用

Chinese Chemical Letters 2023年第12期34卷 491-494页

作者： Pan Tian Minghui Tan Guiqiang Zhu Dan Wang Guoxin Lu Mengjiao Cheng State Key Laboratory of Chemical Resource Engineering&Beijing Laboratory of Biomedical Materials&Beijing Advanced Innovation Centre for Soft Matter Science and Engineering Bejing University of Chemical TechnologyBeijing 100029China

Wettability transition is a significant responsive mechanism which is widely applied to construct smart materials and systems.The broad-spectrum responsiveness of the wettability transition makes it a promising way to expand innovative applications.Here,we develop a track-guided self-transportation system mediated by sequential wettability transition accompanied with capillary transportation.Alkaline fuel is loaded into polydimethylsiloxane(PDMS)cuboid to trigger the wettability transition of distributed superhydrophobic tracks laid in shallow water.After the wettability transition,the induced capillary force can propel the repetitive track-to-track transportation of PDMS.Importantly,the spacing between adjacent tracks is rationally designed based on multiple factors including threshold of wettability transition,diffusion kinetics and capillary interaction.Furthermore,the track-guided transportation system is applied to realize directed self-assembly of multiple PDMS building blocks for designated configuration,which increases the complexity and intelligence of self-assembly systems.

关键词： Wettability transition Tracks capillary force Self-transportation Directed self-assembly

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A collagen-based electrolyte-locked separator enables capacitor to have high safety and ionic conductivity

引用

Journal of Energy Chemistry 2020年第8期29卷 324-332,I0011页

作者： Heng Xu Yaping Wang Xuepin Liao Bi Shi Biomass Chemistry and Engineering Department Sichuan UniversityChengdu 610065SichuanChina National Engineering Laboratory for Clean Technology of Leather Manufacture Sichuan UniversityChengdu 610065.SichuanChina Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan UniversityChengdu 610065Sichuan.China

The conventional liquid electrolytes(LEs) have a high level of ionic conductivity;however, they often suffer from the poor processability and safety risks of potential leakage. Although solid-state electrolytes(SSEs) can solve these inherent problems of LEs, the ionic conductivity of most SSEs is several magnitudes lower than these of LEs. Herein, we report a novel strategy by building liquid ion-transport channels in a solid framework and prepared an electrolyte-locked separator(ELS) using a collagen fiber membrane(CFm). The liquid electrolyte was primarily infiltrated in the smaller voids of CFm, and its ionic conductivity could attain to 9.0×10-3 S cm-1 when the electrolyte absorption(EA) reached up to 112.0%. After centrifuging treatment, the electrolyte retentions(ER) and ionic conductivities of ELS were 108.93% and 8.37×10-3 S cm-1, respectively, which were much higher than those of commercial cellulose separator(CS), exerting excellent liquid-locking performances. In particular, the electrical double-layer capacitors(EDLC) assembled by ELS or CS were characterized and exhibited similar electrochemical performance,demonstrating the satisfactory ability and applicability of ELS for commercial use. In addition, the ELSbased EDLC exhibited favorable flexibility with relative lower loss of capacitance under different angles of bending.

关键词： Collagen fiber Ionic conductivity capillary force Electrolyte retention EDLC

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Alignment of Nanoscale Single-Walled Carbon Nanotubes Strands

引用

Nano-Micro Letters 2011年第3期3卷 146-152页

作者： Danna Yang Lin Wang Xiaoxian Zhang Dongwei Wang Zhiqiang Shen Sai Li School of Chemical Engineering Sichuan University Academy of Military Medical sciences Chinese PLA Center for Disease Control & Prevention

Depositing single-walled carbon nanotubes(SWNTs) with controllable density, pattern and orientation on electrodes presents a challenge in today's research. Here, we report a novel solvent evaporation method to align SWNTs in patterns having nanoscale width and micronscale length. SWNTs suspension has been introduced dropwise onto photoresist resin microchannels; and the capillary force can stretch and align SWNTs into strands with nanoscale width in the microchannels. Then these narrow and long aligned SWNTs patterns were successfully transferred to a pair of gold electrodes with different gaps to fabricate carbon nanotube field-effect transistor(CNTFET). Moreover, the electrical performance of the CNTFET show that the SWNTs strands can bridge different gaps and fabricate good electrical performance CNTFET with ON/OFF ratio around 106. This result suggests a promising and simple strategy for assembling well-aligned SWNTs into CNTFET device with good electrical performance.

关键词： Single-walled carbon nanotubes Microchannel capillary force Carbon nanotube field effect transistor

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Self-assembly of micro parts on normal glass substrate

引用

Progress in Natural Science:Materials International 2004年第10期14卷 94-96页

作者： ZHANG Jiangang ,XIA Shanhong,CHEN Shaofeng,LIU Mei,SUN Hongguang and DENG Kai (State Key Laboratory of Transducer Technology,Institute of Electronics,Chinese Academy of Sciences,Beijing100080,China) Lab. of Transducer Technol. Inst. of Electron. Chinese Acad. of Sci. Beijing 100080 China

Fluidic self-assembly is an approach by which micro parts less than one millimeter in size can be driven by the capillary force of a certain adhesive liquid and be fixed onto the desired sites on some substrates.Normal glass with the composition of Na 2 SiO 3 CaSiO 3 4SiO 2 has been widely used in fluidic microelectromechanical systems(MEMS)and bio-MEMS devices.We investigate the MEMS self-assembly experiment on normal glass substrate.The results of scanning electron microscopy(SEM)show that micro-parts of400μm×400μm squares can be precisely assembled in the expected area of the normal glass substrate.

关键词： self-assembly microelectromechanical systems(MEMS) capillary force normal glass substrate

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：