Abstract
Measurements of the contact angle for water, formamide and diiodomethane on the layers of R-95 Rhamnolipid, surfactin, n-octyl-β-d-glucopyranoside, n-dodecyl-β-d-glucopyranoside, n-dodecyl-β-d-maltoside, sucrose monodecanoate, sucrose monododecanoate, Tween 20, Tween 60 and Tween 80 as well as rhamnose, sucrose and poly(ethylene glycol) 8000 deposited on polytetrafluoroethylene, polyethylene, polymethyl methacrylate, polyamide and quartz were made. On the basis of the obtained results the changes of surface properties of the studied solids under the influence of the surfactants as well as rhamnose, sucrose and poly(ethylene glycol) 8000 layer were considered using different theoretical methods From these considerations it was deduced that hydrophilic and hydrophobic balance of a given solid surface covered by the surfactant layer changes as a function of the layer thickness and kind of surfactant. However, surface properties of the thick layer of a given surfactant does not depend on the kind of solids. These properties for biosurfactants are comparable to that of rhamnosa, sugar surfactants to sucrose and Tween’s to poly(ethylene glycol) 8000.
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