Static Contact Angle of Sessile Air Bubbles on Polymer Gel Surfaces in Water

概要

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We have measured the static contact angle of sessile air bubbles in water on poly (N-isopropylacrylamide) (NIPA) gel surfaces. The temperature dependence of the contact angle was measured on two different kinds of samples, consisting of homogeneous networks (transparent) and of phase-separated networks (opaque). It was found that the transparent gel exhibits a sharp but continuous decrement in the contact angle upon heating in the vicinity of the transition point, while the opaque gel does not show any appreciable change. The absolute value of the contact angle of the transparent gel in the collapsed state is evidently smaller than that of the opaque gel. These results were qualitatively discussed in a terms of not only the chemical but also the physical surface properties in response to the temperature change; the former is the balance of the hydrophobic hydrophilic interactions in this system, and the latter includes the surface polymer density, the surface roughness, and the network inhomogeneity.
社団法人応用物理学会の論文
1999-05-15