Abstract
Plasma treatment increases the surface energy of condensed phases: solids and liquids. Two independent methods of the quantification of the influence imposed by a cold radiofrequency air plasma treatment on the surface properties of silicone oils (polydimethylsiloxane) of various molecular masses and castor oil are introduced. Under the first method the water droplet coated by oils was exposed to the cold air radiofrequency plasma, resulting in an increase of oil/air surface energy. An expression relating the oil/air surface energy to the apparent contact angle of the water droplet coated with oil was derived. The apparent contact angle was established experimentally. Calculation of the oil/air surface energy and spreading parameter was carried out for the various plasma-treated silicone and castor oils. The second method is based on the measurement of the electret response of the plasma-treated liquids.
Highlights
Plasma treatment is widely used for the modification of surface properties of solid organic materials [1]
Our paper focuses on the modification of surfaces of Topological aspects of linear elastisity theory organic liquids exposed to cold radiofrequency plasma by two independent techniques, namely the measurement of the apparent contact angle and study of their electret response
Water droplets deposited on silicone oils were encapsulated with them, as demonstrated in Refs. 7, 9
Summary
Under the first method the water droplet coated by oils was exposed to the cold air radiofrequency plasma, resulting in an increase of oil/air surface energy. An expression relating the oil/air surface energy to the apparent contact angle of the water droplet coated with oil was derived. Введено два незалежні методи кількісної оцінки впливу холодної радіочастотної обробки плазмою на властивості поверхні силіконових масел (полидиметилсилоксана) різних молекулярних мас та касторової олії. За першим способом крапля води, вкрита маслами, зазнавала впливу холодної повітряної радіочастотної плазми, що призводило до збільшення поверхневої енергії масла/повітря. Що зв'язує енергію поверхні нафти і повітря з удаваним кутом контакту краплі води, що вкрита маслом. Розрахунок параметрів поверхневої енергії нафти і повітря проводили для різних оброблених плазмою силіконових і касторових масел. Brilliant scientist and teacher, who devoted his life to Kharkov University
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