Hydrophilization of Liquid Surfaces by Plasma Treatment
Victor Multanen, Gilad Chaniel, Roman Grynyov, Ron Yosef Loew, Naor, Siany, Edward Bormashenko
TL;DR
This study investigates how cold radiofrequency air plasma treatment alters the surface properties of silicone oils, making them more hydrophilic temporarily, with recovery times depending on molecular mass.
Contribution
It introduces a theoretical model for calculating apparent contact angles on plasma-treated liquid surfaces and examines hydrophobic recovery dynamics.
Findings
Plasma treatment significantly decreases water contact angles on silicone oils.
Hydrophobic recovery occurs over time, with longer recovery for higher molecular mass oils.
A theoretical approach to contact angle calculation is proposed.
Abstract
The impact of the cold radiofrequency air plasma on the surface properties of silicone oils (polydimethylsiloxane) was studied. Silicone oils of various molecular masses were markedly hydrophilized by the cold air plasma treatment. A pronounced decrease of the apparent water contact angles was observed after plasma treatment. A general theoretical approach to the calculation of apparent contact angles is proposed. The treated liquid surfaces demonstrated hydrophobic recovery. The characteristic time of the hydrophobic recovery grew with the molecular mass of the silicone oil.
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