摘要
为了探索微波对固态物质表面的影响作用,并对化工表面过程引入微波强化提供依据,根据Washburn浸渍理论和Owens-Wendt-Kaelble法及薄板毛细渗透技术,采用了多种有机物作为液体探针,测定了微波辐射下硫酸钙粉末的接触角变化和表面自由能。测定结果显示微波辐射后硫酸钙粉末的表面自由能得到提高,从39.6mJ·m-2增加到41.8mJ·m-2,其主要原因是使硫酸钙表面能的极性成分得到了较大的提高。这一结果归于微波幅射引起晶粒表面的电荷重排,与晶粒表面能带分裂引起的电子跃迁理论是相吻合的。
In order to explore the effect of microwave on the solid surface so as to promote the technology of microwave intensification in chemical surface process, and based on the Washburn penetration theory, Owens-Wendt-Kaelble method and thin layer wicking technology, the variation of surface free energy of calcium sulfate powder in the microwave field was measured by using several organic compounds as Liquid probes. The results show that, after treated with microwave radiation, the surface flee energy of the powder is enhanced from 39.6 mJ·m^-2 to 41.8 mJ·m^-2. This is mainly caused by the rearrangement of electric charges on the grain crystal surface, and this phenomenon is coincident with the theory of electron transition caused by energy band splitting of the grain crystal surface.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2009年第1期178-181,共4页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金(20276042)
关键词
微波辐射
表面能
硫酸钙
毛细渗透
microwave radiation
surface free energy
calcium sulphate
thin layer wicking
