contact angle – Page 2 – TechConnect Briefs

Lithographic fabricated ultra hydrophobic and porous plant-like surfaces for bio chip applications

Mertsch O., Walter A.D., Loechel B., Schondelmaier D., BESSY GmbH, DE

A novel method for fabricating ultra-hydrophobic surfaces for bio chip and MEMS applications is presented. The base of this method is a lithographic process with some substantial changes of the exposure conditions. Plant-like structures are [...]

Intrinsic Effects of Materials on Superhydrophobicity of Polymer Replicas from Nature

Lee S.M., Kwon T.H., Pohang University Science and Technology, KR

The present work suggests a mass-producible and large scale fabrication method of superhydrophobic polymeric surfaces by means of material processing equipments which can maximize productivity and cost effectiveness. We fabricated two types of polymeric lotus [...]

Replication of Highly-Hydrophobic Surface with Micro/Nano Combined Structures from Nature

Lee S.M., Kwon T.H., Pohang University of Science and Technology, KR

A highly-hydrophobic film has successfully been fabricated by simply replicating plant leaf surface with micro/nano combined structures. A plant leaf was used as a master to make a mold by nickel electroforming. The positive polymer [...]

Simulation of filling of microfluidic devices using a coarse-grained continuum contact angle model

Narayanan C., Lakehal D., ASCOMP, CH

We present a new dynamic contact angle model applied to the fillingproblem in microfluidic devices. The level-set method is used forinterface capture. Several attempts have been made in the past decades to model contact--line dynamics [...]

Role of Nanoscale Topography on the Super-Hydrophobicity: A Study of Fluoro-Based Polymer Film on vertically Carbon Nanotubes

Phani A.R., Grossi V., Passacantando M., Santucci S., University of L'Aquila, IT

The unique electronic, mechanical and chemical properties of carbon nanotubes making them most promising candidate for the building blocks of molecular-scale machines, and nanoelectronic devices. On the other hand, highly hydrophobic films are being actively [...]

Fabrication of Hydrophobic Film using Plant Leaves from Nature

Lee H.S., Lee S.M., Lee H.S., Lee S.M., Kwon T.H., Pohang University of Science and Technology, KR

In this study, we have attempted to reproduce the hydrophobic characteristics of plant leaves from nature by replicating the micro/nano feature of leaf surface in UV embossed film. The contact angle (CA) of the replicated [...]

Role of Nanoscale Topography on the Hydrophobicity: A Study of Fluoro-Based Polymer Film on Carbon Nanotubes

Phani A.R., Lozzi L., Passacantando M., Santucci S., University of L'Aquila, IT

The unique electronic, mechanical and chemical properties of carbon nanotubes making them most promising candidate for the building blocks of molecular-scale machines, and nanoelectronic devices. On the other hand, highly hydrophobic films are being actively [...]

Water-Carbon Interactions: Potential Energy Calibration Using Experimental Data

Werder T., Walther J.H., Jaffe R.l., Koumoutsakos P., NASA Ames Research Center, US

Functionalized carbon nanotubes (CNT) are being studied for use as nanoscale biosensors and water or proton channels. Several molecular dynamics (MD) studies of water in carbon nanotubes have recently been performed to gain further insight [...]

Quasi-static Motion of Bubbles in Microchannel Contractions

Jensen M.J., Goranovic G., Bruus H., Technical University of Denmark, DK

We present a thorough theoretical and computational study of bubble dynamics in icrofluidic channels with contractions. We investigate the effects of geometry and surface physics (friction and contact angle) on the behavior of incompressible bubbles, [...]

Hydrodynamics of Carbon Nanotubes Contact Angle and Hydrophobic Hydration

Werder T., Walther J.H., Koumoutsakos P., Inst. of Computational Sciences, ETH, CH

Molecular dynamics simulations are used to study the hydrophobic-hydrophilic behavior of carbon nanotubes in water. We report contact angles for tube diameters ranging from 25 to 75 and for droplets containing up to 4632 water [...]