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Wettability and surface charge of Si3N4–bioglass composites in contact with simulated physiological liquids

Paper ID Volume ID Publish Year Pages File Format Full-Text
13180 838 2002 7 PDF Available
Title
Wettability and surface charge of Si3N4–bioglass composites in contact with simulated physiological liquids
Abstract

Wettability and surface charge studies were performed on a novel Si3N4–30 wt% bioglass biocomposite. Contact angle and surface tension variation with time were determined at 25°C, respectively, by the sessile and pendant drop techniques, for distinct testing liquids: water, diiodomethane, simulated body fluid (SBF) and bovine serum albumin (BSA) dissolved in SBF solution. This biocomposite revealed a hydrophilic character (θ=26.6±2.0°) and a surface tension value (66.6 mJ m−2) comparatively higher than those of the most common bioceramics. An important characteristic is the high work of adhesion towards SBF+BSA (96.4±0.2 mJ m−2) that was measured. The Si3N4–bioglass material is negatively surface charged above the pHIEP=2.5 in aqueous SBF+BSA solution, as a result of the presence at the surface of unsaturated Si–O bonds and Si–OH groups. The very high negative zeta potential at pH∼7 (−58.6±5.5 mV) influenced albumin adsorption and mechanisms are discussed in terms of entropy and enthalpy gains from conformational unfolding and cations coadsorption.

Keywords
Si3N4–bioglass composites; Contact angle; Surface tension; Zeta potential
First Page Preview
Wettability and surface charge of Si3N4–bioglass composites in contact with simulated physiological liquids
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 23, Issue 20, October 2002, Pages 4123–4129
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering