反气相色谱在水泥颗粒表面性质研究中的应用

摘要

Thermodynamic theory and measurement principle of inverse gas chromatography(IGC) for analysis of cement particle surface characteristic were introduced,and the analyzing results was presented.It is indicated that both polar and nonpolar probe molecules can interact with cement particle surface.As the surface coverage of probe molecules increasing,the dispersion,special and total surface energy of cement particles decrease effectively,but the range of decline tends to be small.The driving force of the adsorption between polar probe molecules and cement particles is acid-base interaction in nature,but the surface of cement particles is more basic as a whole.The total surface energy of cement particles appears approximately a normal distribution,showing an energetic heterogeneity characteristic.%详述了反气相色谱用于水泥颗粒表面性质测试的热力学理论和仪器原理,并以此测试了水泥颗粒的表面性质.结果表明:极性和非极性探针分子均与水泥颗粒表面发生相互作用,随着分子表面覆盖率的增加,水泥颗粒的色散表面能、极性表面能和总表面能均显著降低,但降低幅度趋于缓和;极性探针分子吸附于水泥颗粒表面的驱动力本质上是酸碱作用力,水泥颗粒表面总体表现为碱性;水泥颗粒总表面能的分布近似于抛物线或正态分布,呈非均质特性.