ガラス表面永久汚染発生機構とその対策に関する研究(第3報) : ガラス板上難溶性塩水溶液の蒸発機構とそれらの沈積物の模様

概要

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Evaporation of a liquid droplet of aqueous solutions of slightly soluble electrolytes such as CaCO_3, CaSO_4, and KIO_4 and of concrete-soaked-rain water and concrete-soaked-distilled water on untreated and surface-treated glass plate has been investigated through the measurement of bottom length and contact angle of the liquid droplet against time. The deposition of the solute after evaporation has also been investigated. The contact angle decreased at a constant bottom length during the evaporation of a droplet on untreated glass plates. The solute deposited on the edge of the droplet and showed a caldera-like ring after complete evaporation. On the other hand, contact angle decreased to a limited value θ_R at a constant length of bottom of a droplet on the hydrophobic surface of glass plate with low surface energy and afterwards the length of bottom of a droplet decreased at a constant contact angle, 6R during its evaporation. A crystalline agglomerate smaller than that of the initial liquid droplet was deposited after complete evaporation.
社団法人日本セラミックス協会の論文
1991-03-01