Surface properties of the composite films based on poly(vinyl alcohol) and nanodiamonds as studied by wetting techniques and autoradiography

Surface concentration of oxidized nanodiamonds (NDs) and NDs modified with oleylamine in NDs–poly(vinyl alcohol) composite films has been determined by autoradiography using tritium-labeled NDs. It has been demonstrated that oxidized NDs are distributed uniformly in the composite films, and their surface concentration is the same at both sides of the film. After modification with oleylamine, ND concentration at the bottom side of the film exceeds that at the top side approximately tenfold. Zisman critical surface tension of the composite films as well as polar and non-polar contributions to the surface tension has been found. It has been shown that surface tension is determined by the polymer, and the addition of NDs does not affect its value.

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