𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Atomic Force Microscopy and Wettability Study of Oxidized Patterns at the Surface of Polystyrene

✍ Scribed by Christine C Dupont-Gillain; Bernard Nysten; Vladimir Hlady; Paul G Rouxhet

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
169 KB
Volume
220
Category
Article
ISSN
0021-9797

No coin nor oath required. For personal study only.

✦ Synopsis

The surface properties of patterned surfaces made by a combination of photolithography and oxygen plasma treatment of polystyrene (PS) were investigated. PS and plasma-treated PS (PSox) were first characterized using X-ray photoelectron spectroscopy and the study of wetting dynamics (Wilhelmy plate method) in water and in solutions of different pH. The results indicated that the PSox surface may be viewed as covered with a polyelectrolytelike gel, which swells depending on pH. It was then shown, using atomic force microscopy (AFM), that the adhesion force measured on PS with a silicon tip in water was higher compared with that measured on PSox. This feature allowed imaging of the oxidation patterns using the adhesion mapping mode. The origin of the pulloff force contrast, which could not be explained by combining Johnson-Kendall-Roberts theory and thermodynamic considerations, was attributed to repulsion between the tip and hydrated polymer chains present on the oxidized surface. Imaging was also performed in the lateral force mode, a higher friction being recorded on PS than on PSox.

πŸ“œ SIMILAR VOLUMES

Functionalization of chitosan membranes
Functionalization of chitosan membranes through phosphorylation: Atomic force microscopy, wettability, and cytotoxicity studies
✍ I. F. Amaral; P. L. Granja; LuΓ­s V. Melo; B. Saramago; M. A. Barbosa πŸ“‚ Article πŸ“… 2006 πŸ› John Wiley and Sons 🌐 English βš– 236 KB

## Abstract Grafting negatively charged groups such as phosphates is a well‐known strategy for inducing the deposition of apatite‐like layers under simulated physiological conditions. In this investigation, chitosan was phosphorylated in an attempt to enhance its osteoconduction. Chitosan membranes

Determining Surface Potential of the Bit
Determining Surface Potential of the Bitumen-Water Interface at Nanoscale Resolution using Atomic Force Microscopy
✍ Jaroslaw Drelich; Jun Long; Anthony Yeung πŸ“‚ Article πŸ“… 2008 πŸ› John Wiley and Sons 🌐 English βš– 768 KB

## Abstract Atomic force microscopy (AFM) was used to measure the surface forces between a silicon nitride AFM tip and a deposited layer of Athabasca bitumen; the measurements were carried out in pure water (pH 6.0–6.5) and 1 mM KCl solution (pH 9). An AFM pyramidal‐shaped tip was moved stepwise us

Atomic force microscopy investigation of
Atomic force microscopy investigation of the O2+-induced surface topography of InP
✍ Pan, J. S.; Tay, S. T.; Huan, C. H. A.; Wee, A. T. S. πŸ“‚ Article πŸ“… 1998 πŸ› John Wiley and Sons 🌐 English βš– 624 KB

The surface topography development of InP as a function of ion energy and incident angle was investigated O 2 ' using atomic force microscopy (AFM). Cone formation was found to be the dominant surface feature under various ion bombarding conditions. However, variations in the density and size of the