Coatings and Surfaces – TechConnect Briefs

Effects of Surface Texture and Chemistry on Surface Hydrophobicity and Oleophobicity

Law K-Y, Zhao H., Sambhy V., Xerox Corporation, US

The effects of surface texture and chemical modification on the hydrophobicity and oleophobicity of the resulting surfaces have been systematically investigated. The surface textures were created by the conventional photolithographic technique on Silicon wafer. This [...]

Nanostructured and Self-Assembled Superhydrophilic Bipolar Plate Coatings for Fuel Cell Water Management

Dadheech G., Abd Elhamid M., Blunk R., General Motors Corporation, US

A stably superhydrophilic coating is required on composite and metal bipolar plates to manage byproduct liquid water and, in turn, to enable good PEM fuel cell performace under low power vehicle operating conditions. Silica-based coatings, [...]

Hierarchical Superhydrophobic Surfaces Resist Water Droplet Impact

Varanasi K.K., Deng T., Hsu M., Bhate N., Massachusetts Institute of Technology, US

In this paper, we present static and dynamic wetting interactions of water droplets on a variety of superhydrophobic surfaces. For sessile droplets, wetting states were determined by measuring contact angles and comparing them to that [...]

PVDF based polymer nanocomposite coatings for large area applications

Tiwari M.K., Bayer I.S., Megaridis C.M., University of Illinois at Chicago, US

A class of polymer nanocomposites consisting of all biocompatible components has been developed for large area coating applications. The coatings are made possible by solution blending of poly (vinylidine fluoride) (PVDF) with polymerized ethyl cyanoacrylate. [...]

Rapid Synthesis of Anti-Fogging Coatings

Tricoli A., Righettoni M., Pratsinis S.E., Swiss Federal Institute of Technology, CH

The wetting properties of surfaces are fundamental properties greatly influencing their interaction with the environment. Self-cleaning, bacteria-resistant, and anti-fogging surfaces are feasible by depositing either super-hydrophobic or super-hydrophilic coatings and will have great impact on [...]

Super-hydrophobic and/or Super-hydrophilic Surfaces Made by Plasma Process

Chen L., Henein G., Liddle J.A., National Institute of Standards and Technology, US

Superhydrophobic and superhydrophilic surfaces are generally made by modifying the surface with chemistry and introducing roughness or patterns on surfaces. The processes are generally complex and time-consuming. In this paper, we introduce a simple and [...]

Photoactivity of nitrogen-doped anodic TiO2 under UV and VIS light irradiation

Diamanti M.V., Ormellese M., Pedeferri M.P., Politecnico di Milano, IT

Titanium dioxide is probably the most efficient among the known photocatalysts, and undoubtedly the most studied one. An appealing route to tune obtain TiO2 films morphology and structure is to exploit the anodizing process to [...]

Ordered mesoporous films of TiO2 as highly efficient photocatalysts for clean environment

Rathousky J., Kalousek V., Walsh C., J. Heyrovsky Institute of Physical Chemistry, CZ

Photocatalytic oxidation is a promising technology for the purification of air. Providing the surfaces of objects with a finish which is photocatalytically active and exhibits stable illumination-induced superhydrophilicity, is a promising route how to render [...]

Growth, Optical Characterization and Modelling of ZnO Nanorods on Si, SiC and Macroporous Si Structure

Ferreira da Silva A., Castro Meira M.V., Persson C., Gutman N., Sa’ar A., Klason P., Willander M., Universidade Federal da Bahia, BR

1- Instituto de Física, Universidade Federal da Bahia, Ondina, Salvador-Ba, 40210-340, Brazil 2- CETEC-Universidade Federal do Recôncavo da Bahia, Cruz das Almas-Ba, 44380-000, Brazil 3- Department of Materials Science and Engineering, Royal Institute of Technology, [...]

Antibacterial activity on Polyamide and Natural fabrics using Low Temperature Plasma

Shahidi S., Rashidi A., Wiener J., Ghoranneviss M., I.A. University, IR

Polyamide (PA) synthetic textiles are among the most used fibers in the biomedical textile field [1]. Wounds often provide a favorable environment for the colonization of microorganisms. In order to improve the opportunity for wound [...]

Morphological variations on titanium by AC anodizing

Diamanti M.V., Ormellese M., Pedeferri MP., Politecnico di Milano, IT

Besides the widely investigated photoinduced properties of its oxides, a primary branch of application of anodized titanium is the production of biomedical implants, where a controlled roughness can lead to improvements in cell adhesion and [...]

Functional Polymer Micro- and Nanostructures by Nanoimprint

Cheng X., Park H., Cui D., Texas A&M University, College Station, US

We present here the patterning of polymer micro- and nanostructures by nanoimprint technique. Since its inception, nanoimprint has gained huge interest as a high-resolution and low-cost lithography technique for microelectronic fabrication. We demonstrate that nanoimprint [...]

Wicking Study of Nanostructured Titania Surfaces for Flat Heat Pipes

Ding C., Bogorzi P., Sigurdson M., Soni G., Meinhart C., MacDonald N.C., university of california, santa barbara, US

We report a wicking material based on nanostructured TiO2 (NST) for the application of flat heat pipes. This wicking material is formed by oxidizing Ti pillar structures in H2O2 solution. The NST surfaces shows nano-scale [...]

Temperature and Stress Controlled Surface Manipulation in NiAl Nano-Layers

Sutrakar V.K., Roy Mahapatra D., Melnik R.V.N., Indian Institute of Science, IN

Quantum dot arrays with precisely controlled positions and sizes are desirable for making templates for micro-and nano-electronic devices. Numerous experimental works have shown that unguided self-assembled growth of quantum dots usually fails to realize perfectly [...]

Cobalt doped ZnO prepared by electrochemistry: chemistry, morphology, and magnetism

Enculescu I., Matei E., Vasilache V., Teodorescu C.-M., National Institute of Materials Physics, RO

Pure and cobalt-doped ZnO films were electrodeposited from zinc and cobalt nitrate aqueous solutions on platinum substrates and investigated by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and magneto-optical Kerr effect (MOKE). X-ray photoelectron [...]

Analysis of the Liquid Mediated Friction during Alignment in NIL Process

Kang S-H, Park S.H., Lee W.I., Seoul National University, KR

When Nano-Imprint Lithography (NIL) process is adopted in the large area applications like display, the stiction phenomenon which is the adhesion or in-plane friction between mold and substrate to disturb fine alignment process can be [...]

The Next Generation of Proteomic Nanochips for Biomarker Discovery

Hu Y., Tasciotti E., Bouamrani A., Liu X., Li L., Liu X., Ferrari M., The University of Texas at Austin, US

In this study, the nanoporous silica thin films (NSTF) were chosen for the reproducible fractionation and selective binding of the serum-based low molecular weight proteome (LMWP). It has been recognized that the collection of LMWP [...]

Nanoscale UV-absorber for sustainable paint and coating applications

Wessels W., Nolte U., Berkei M., BYK Chemie GmbH, DE

Innovative nanomaterials are finding their way into paints, coatings, and plastics applications. Beside improving or modifying the mechanical polymer properties, giving higher scratch resistance for example, nanoscale materials like CeO2 are applied to improve UV [...]

Oxylink™: Improved resistance for water borne coatings

Pilotek S., Burgard D., Herold M., Steingröver K., Buhler Inc., US

The overall market share of environmentally friendly water borne coatings is small compared to solvent borne alternatives. Today, they are used in a wide selection of market segments, such as wood and furniture, but also [...]

Modification of rubber surface with hydrogenated diamond-like carbon thin films

Pei Y.T., Bui X.L., De Hosson J.Th.M., University of Groningen, NL

Thin films of hydrogenated diamond-like carbon (DLC) have been deposited on hydrogenated nitrile butadiene rubber (HNBR) for reduction of friction and enhancement of wear resistance of dynamic rubber seals, by sputtering graphite targets in C2H2/Ar [...]

Papers: