Evaluation of the Surface Energy of Dispersed Aluminium Oxide Using Owens-Wendt Theory

O. Myronyuk, D. Baklan, L. Nudchenko
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引用次数: 7

Abstract

Knowing the value of the surface energy of powder materials allows to predict the interaction of the solid phase with liquids, the formation of stable dispersions, durable and resistant to aggressive factors of composites. The application of the Owens-Wendt model for determining the change in the surface energy of aluminium oxide modified by various water repellents is considered. Also, to determine the contact angle of the surface of the modified material, the Washburn method is used, which consists in determining the rate of capillary rise of the test fluid. This method is chosen due to low requirements in the accuracy of measuring equipment and at the same time shows a high degree of accuracy of the results.The object of research is a method for determining the surface energy of powder materials, using aluminium oxide modified with polymethylhydrosiloxane as an example. Surface modifications of the aluminium oxide powder are carried out in a xylene suspension.In the work, the determination of surface energy is carried out in accordance with the Owens-Wendt theory by the graphical method in accordance with the obtained values of the contact angle of the material according to the Washburn method. It is established the shape of the particles of aluminium oxide and their average size, and also calculated the specific surface of the material. A modifier, polymethylhydrosiloxane, is found, with the help of which it is possible to obtain a stable superhydrophobic state, and the optimal concentration by determining the contact angles of the powder material with test liquids according to the method proposed by Washburn.To increase the accuracy of determining the surface energy of the material according to the Washburn method, a mixture of water with ethanol is used, and the components of surface tension are calculated. It is shown that the values of the contact angle of the surface of the dispersed material obtained using a mixture as a test liquid can be used to calculate the values of the components of the surface energy of aluminium oxide. In this case, there is a lack of error in the form of the Cassie state, which is observed for hydrophobic dispersed materials when using water as a test fluid.
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用欧文斯-温特理论评价分散氧化铝的表面能
了解粉末材料的表面能值,可以预测固相与液体的相互作用,形成稳定的分散体,复合材料的耐用性和抗侵蚀性。考虑了欧文斯-温特模型在确定不同防水剂改性氧化铝表面能变化中的应用。此外,为了确定改性材料表面的接触角,使用了Washburn方法,该方法包括确定测试流体的毛细上升速率。选择这种方法的原因是对测量设备的精度要求不高,同时结果的精度也很高。以聚甲基氢硅氧烷改性氧化铝为例,研究了粉末材料表面能的测定方法。氧化铝粉体的表面改性在二甲苯悬浮液中进行。在工作中,根据根据Washburn法得到的材料接触角值,按照Owens-Wendt理论,用图解法进行表面能的测定。建立了氧化铝颗粒的形状及其平均尺寸,并计算了材料的比表面积。发现了一种改性剂聚甲基氢硅氧烷,根据Washburn提出的方法,通过确定粉末材料与测试液体的接触角,可以获得稳定的超疏水状态和最佳浓度。为了提高根据Washburn方法测定材料表面能的准确性,使用了水与乙醇的混合物,并计算了表面张力的分量。结果表明,用混合物作为测试液体得到的分散材料表面的接触角值可以用来计算氧化铝表面能的各组分的值。在这种情况下,没有Cassie状态形式的误差,这是在使用水作为测试流体时观察到的疏水性分散材料。
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