Abstract

The surface of a smooth fused silica disk was dehydrated by heating in an ultrahigh-vacuum system. Contact angles of methylene iodide on the disk were measured in situ by a vapor-phase transfer method. Values were obtained which were lower than any previously reported for methylene iodide on siliceous glass. Included among them was the value of zero degrees, which was obtainable under certain conditions. The contact angles were interpreted in terms of the types of glass surface obtainable in ultra-high vacuum.

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