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Comparison between wettability gradients made on gold and on Si/SiO2 substrates by S Welin-Klintström; M Lestelius; B Liedberg; P Tengvall is a Materials Science article available to read on EtoBox.

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We have previously shown that wettability gradients on Si/SiO 2 can be used to analyze in detail the interactions of surfactants and proteins with the vast number of different surface properties that a gradient represents. We have also shown that the interactions of surfactants can be used to characterize the surface. In this report we discuss a new kind of wettability gradient that is composed from alkanethiols on gold. Surfactant and protein adsorption phenomena are investigated and compared with analogous experiments made on gradients prepared from chlorosilanes on Si/SiO 2 substrates. Surfactant adsorption studies were used to investigate the surface properties. Through their electrostatic interactions negatively charged groups on the surface could be detected and through their hydrophobic interactions defects in the surface layer resulting in hydrophobic groups could be detected. The alkanethiol gradient had at the extreme OH-side an advancing contact angle to water between 30 and 40°. Still this surface had a lower adsorbed amount of fibrinogen compared to a (completely wetting) silica surface covered with negatively charged and uncharged silanol groups, indicating that the f

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Author

S Welin-Klintström; M Lestelius; B Liedberg; P Tengvall

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0927-7765)

Published

1999

Language

EN

Field

Materials Science (Physical Sciences)