An experimental method for measuring the spreading velocity of surface active substances on thin films of liquid substrate

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• 作者：Junfei Tian ; Lin Wang ; Myriam Hudry-Clergeon ; Wei Shen
• 关键词：Surfactant spreading velocity ; Liquid substrates ; Paper sizing ; Alkyl ketene dimer (AKD) ; Alkenyl succinic acid anhydride (ASA)
• 刊名：Chemical Engineering Science
• 出版年：2009
• 出版时间：15 July 2009
• 年：2009
• 卷：64
• 期：14
• 页码：3311-3319
• 全文大小：527 K

文摘

This paper reports the development of a new experimental method suitable for the determination of the spreading velocity of surface active substances on a thin film of liquid substrate over a solid surface. Previous research showed that when oil and surfactants spread on the surface of a deep body of water, the spreading velocity is usually quite high, being in the range of several tens of centimeters per second. However, the spreading velocities of these substances on a thin water film are much slower. This is because that the spreading of an oil or a surfactant on water surface is not just a two dimension phenomenon, but a phenomenon involving the movement of water in a small depth below the surface. An additional process impeding oil or surfactant spreading in this situation is the interaction of the spreading molecules with the liquid/soild interface underneath water surface. The experimental method developed in this work uses a Wilhelmy balance to monitor the average spreading velocity of surface active substances on a thin water film over a porous solid substrate. The spreading of cellulose hydrophobization agents over wet paper web during the papermaking process is used as an example to demonstrate the capability of the method.