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Development of Measuring Apparatus for the Rate of Capillary Wetting in Fiberous Assemblies.

纤维组件毛细管润湿率测量装置的开发。

基本信息

批准号：
60880016
负责人：
TAGAWA Mieko
金额：
$ 3.01万
依托单位：
Nara Women's University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

项目摘要

The rate of capillary wetting in fiberous assemblies was measured using a newly developed apparatus. The change in electric conductivity with time was measured by using a plug of fiber, fabric or filter paper in a cylinderical Teflon cell of inner radius 10 mm and height 3 mm or 7 mm. The electrodes were platinum disks of diameter 16 mm with 37 holes of radius 0.5 mm, which were placed at the top and bottom of the plug. The head of wetting liquid was adjusted to the bottom level of the plug and then the liquid went up by capillarity. The traveling time in the shortest capillary in the fiberous assembly, <t_0> , which is detected as the yield values in the electric conductivity versus time curves, and the initial slope of the curves, S, were used as parameters of wetting rate. The increase in <t_0> and the decrease in S show the decrease in the capillary wetting rate for the plug. Measurements of capillary wetting rate by this apparatus were successfully carried out using plugs of cellulose filter paper, polyester fabric and nylon fiber. The effect of the alkyl chain length of alkyltrimethyl ammonium chloride on the wetting rate was investigated, The effect of electrolyte (KCl) was also investigated for sodium dodecyl sulfate. The basic studies on wetting were carried out; the capillarity in glass tubes coated with nylon as model capillaries was investigated and the dynamic contact angles were measured by the wilhelmy method.

用一种新研制的仪器测量了纤维组件的毛细润湿速率。电导率随时间的变化是通过将纤维、织物或滤纸塞在内半径为10毫米、高为3毫米或7毫米的圆柱形聚四氟乙烯电池中测量的。电极为直径为16mm的铂盘，直径为0.5 mm，直径为37个孔，分别放置于插头的顶部和底部。将润湿液头调整到塞子底部，然后利用毛细作用使润湿液上升。在纤维组件中最短的毛细管中行进时间<t_0>作为电导率-时间曲线的屈服值，曲线的初始斜率S作为润湿速率参数。<t_0>的增大和S的减小表明堵塞的毛细润湿速率减小。用该仪器对纤维素滤纸、聚酯织物和尼龙纤维进行了毛细管润湿率的测试。考察了烷基三甲基氯化铵的烷基链长度对润湿速率的影响，考察了电解液（KCl）对十二烷基硫酸钠润湿速率的影响。进行了润湿的基础研究；研究了尼龙涂层玻璃管内的毛细管现象，并用wilhelmy法测量了玻璃管内的动态接触角。