Abstract
The adsorption of albumin protein (bovine serum albumin) from aqueous solution onto different types of cross-linked plasma polymer films is studied with unexpected results. Films are plasma-polymerized from a methylated siloxane precursor with controlled oxygen addition to obtain variable oxygen/carbon ratios, which adjust the hydrophobic–hydrophilic balance. Using the same technique vertical chemical gradients are generated with a hydrophobic surface termination and gradual transition to the hydrophilic plasma polymer over a few nanometers in depth. Remarkably, protein adsorption is significantly reduced on such gradient surfaces, suggesting existence of an energetic contribution from the sub-surface region.
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