scholarly journals Designing Model Systems for Enhanced Adhesion

MRS Bulletin ◽  
2007 ◽  
Vol 32 (6) ◽  
pp. 496-503 ◽  
Author(s):  
Edwin P. Chan ◽  
Christian Greiner ◽  
Eduard Arzt ◽  
Alfred J. Crosby
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Model Systems ◽  
Adhesion Forces ◽  
Synthetic Analogues ◽  
Jumping Spiders ◽  
Topographic Features ◽  
Considerable Research ◽  
Insight Into ◽  
Primary Strategy

AbstractNature provides inspiration for enhanced control of adhesion through numerous examples ranging from geckos to jumping spiders. The primary strategy in these examples is the incorporation of patterns, specifically high-aspect-ratio topographic features, to ingeniously maximize adhesion forces while maintaining ease of release. Recently, considerable research efforts have been devoted toward the understanding, development, and optimization of synthetic analogues to these examples in nature. In this article, we provide insight into the mechanisms that lead to enhanced control of interfacial properties through patterning, the strategies that can be used for fabricating synthetic patterns, and an overview of experimental results that have been used to gain understanding and guidance in this emerging field.

Experimental Investigation of the Evaporation and Stability of a Meniscus in a Flat Microchannel

2011 ◽  
Vol 312-315 ◽  
pp. 1178-1183
Author(s):  
Souad Harmand ◽  
Khellil Sefiane ◽  
Rachid Bennacer ◽  
Nicolas Lancial
Keyword(s):  
Experimental Investigation ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
High Speed ◽  
Evaporation Rate ◽  
Liquid Meniscus ◽  
Line Region ◽  
Three Phase ◽  
Increasing Temperature ◽  
Insight Into

We present the results of an experimental investigation of the evaporation of a liquid meniscus in a high aspect ratio micro-channel. The study investigates evaporation rates of a stationary liquid meniscus in a high aspect ratio microchannel, the wall of which is electrically heated using transparent resistive coating. Four different liquids are used as working fluids. We report on the dependence of the measured overall evaporation rate on the applied power. The results indicate, and consistently, that the evaporation rate increases with the applied power then peaks before declining. In order to gain insight into these results, we used thermographic infra red imaging to map the temperature field on the external wall of the microchannel. The measurements show that there is a good correlation between the maximum in the evaporative rate and the onset of instabilities of the interface. These instabilities, to our mind, are induced by an increasing temperature gradient along the microchannel wall around the three phase contact line region. These instabilities are revealed by a high speed camera used to record the behaviour of the interface during evaporation.

scholarly journals Understanding the role of zinc dithiocarbamate complexes as single source precursors to ZnS nanomaterials

2020 ◽  
Vol 2 (2) ◽  
pp. 798-807 ◽  
Author(s):  
Husn-Ubayda Islam ◽  
Anna Roffey ◽  
Nathan Hollingsworth ◽  
Wim Bras ◽  
Gopinathan Sankar ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Single Source ◽  
Single Source Precursors ◽  
Insight Into

Heating [Zn(S2CNiBu2)2] in oleylamine affords high aspect ratio nanowires of ZnS and in situ XAS studies of the decomposition of [Zn(S2CNMe2)2] give insight into mechanistic aspects of the molecular transformations.

scholarly journals The upper limit and lift force within inertial focusing in high aspect ratio curved microfluidics

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Javier Cruz ◽  
Klas Hjort
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Lift Force ◽  
Complex Fluids ◽  
Scaling Law ◽  
Valuable Insight ◽  
High Quality ◽  
Inertial Focusing ◽  
Upper Limit ◽  
Insight Into

AbstractMicrofluidics exploiting the phenomenon of inertial focusing have attracted much attention in the last decade as they provide the means to facilitate the detection and analysis of rare particles of interest in complex fluids such as blood and natural water. Although many interesting applications have been demonstrated, the systems remain difficult to engineer. A recently presented line of the technology, inertial focusing in High Aspect Ratio Curved microfluidics, has the potential to change this and make the benefits of inertial focusing more accessible to the community. In this paper, with experimental evidence and fluid simulations, we provide the two necessary equations to design the systems and successfully focus the targets in a single, stable, and high-quality position. The experiments also revealed an interesting scaling law of the lift force, which we believe provides a valuable insight into the phenomenon of inertial focusing.

Insight into the Ga/In flux ratio and crystallographic plane dependence of MBE self-assembled growth of InGaN nanorods on patterned sapphire substrates

Nanoscale ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 4018-4029 ◽  
Author(s):  
Jian Shen ◽  
Yuefeng Yu ◽  
Jia Wang ◽  
Yulin Zheng ◽  
Yang Gan ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Flux Ratio ◽  
High Index ◽  
Crystallographic Plane ◽  
Sapphire Substrates ◽  
Self Assembled ◽  
Insight Into ◽  
Patterned Sapphire Substrates

A lower Ga/In flux ratio and a high index sapphire plane favor MBE self-assembled growth of dense, uniform, and high-aspect-ratio InGaN nanorods.

scholarly journals Fundamentals of Inertial Focusing in High Aspect Ratio Curved Microfluidics

2020 ◽  
Author(s):  
Javier Cruz ◽  
Klas Hjort
Keyword(s):  
Aspect Ratio ◽  
Natural Water ◽  
High Aspect Ratio ◽  
Lift Force ◽  
Complex Fluids ◽  
Scaling Law ◽  
Valuable Insight ◽  
High Quality ◽  
Inertial Focusing ◽  
Insight Into

Abstract Microfluidics exploiting the phenomenon of inertial focusing have attracted much attention in the last decade, as they provide the means to facilitate the detection and analysis of rare particles of interest in complex fluids such as blood and natural water. Although many interesting applications have been demonstrated, the systems remain difficult to engineer. A recently presented line of the technology, inertial focusing in High Aspect Ration Curved (HARC) microfluidics, has the potential to change this and make the benefits of inertial focusing more accessible to the community. In this paper, with experimental evidence and fluid simulations, we provide the two necessary equations to design the systems and successfully focus the desired targets in a single, stable, and high-quality position. Last, the experiments revealed an interesting scaling law of the lift force, which we believe provides a valuable insight into the phenomenon of inertial microfluidics.

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