Download PDF by J.H.U. Brown, James Francis Dickson: Advances in Biomedical Engineering. Volume 5

By J.H.U. Brown, James Francis Dickson

ISBN-10: 0120049058

ISBN-13: 9780120049059

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1970). The critical surface tension holds promise for becoming an important single soft tissue characterization parameter for a biomaterial surface, in spite of quite reasonable objections to the contrary (Andrade, 1973). Several important reactions to materials surfaces have been shown to vary in the same order as the critical surface tension: 1. The amount of thrombosis in vivo increases as yc increases (Harrison, 1958). 2. , 1965). 3. Adhesion of tissue to artificial skin decreases as yc increases (Hall et al, 1970).

Galvanic series in sea water for some metals and alloys of interest in biomaterialsa Î Anodic Cathodic I Low alloy steel Stainless steel 316 (unpassivated) Copper Nickel Silver Stainless steel 316 (passivated) Titanium «From Williams (1971b). These series do not take into account oxide film formation at different values of pH. A special type of diagram has been developed which shows the different kinds of behavior as the pH and potential are varied. These special equilibrium diagrams are called Pourbaix diagrams.

Concentrations C\ > c2 > C\. g. pressure osmosis (Srinivasan et al, 1967). Another interesting electrical phenomenon of surfaces is called electrocapillarity (Davies and Rideal, 1963). When a potential is applied to a surface the interfacial free energy changes, as shown in Fig. 8. The surface charge given by the formula σ = -(dy/dE)TtPttl (8) is the negative of the slope of the given curve. The interfacial free energy is a maximum when σ = 0. To the best of our knowledge, this phenome­ non has not been used to date to describe any biomaterials behavior.

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Advances in Biomedical Engineering. Volume 5 by J.H.U. Brown, James Francis Dickson

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