摘要
在用非线性气相色谱测填料表面分形维数中 ,首次运用气固色谱ECP法 (elutionbycharacteristicpointsmethod) ,测定了正戊烷、正己烷、正庚烷3种烷烃在不同颗粒大小的硅胶表面的吸附等温线 ,通过拟合Langmuir方程 ,求出单分子饱和吸附容量 ,并采用单分子层吸附的分形模型 ,求得硅胶的表面分形维数 。
An ECP(elution by characteristic points) method in nonlinear gas chromatography is described for the determination of the surface fractal dimension of silica gel aggregates. The adsorption isotherms of n _ pentane, n _ hexane and n _ heptane on silica gel of various particle sizes were determined by the ECP method. After curve fitting with the Langmuir equation, the mono _ molecular layer adsorption capacity could be obtained. A quatitative relationship exists between the surface fractal dimension and the mono _ molecular layer capacity, provided the molecular cross _ sectional areas of n _ alkanes are known. With the aid of a monolayer fractal dimension model, the surface fractal dimension of silica gel can be computed.
出处
《分析测试学报》
CAS
CSCD
2000年第3期15-18,共4页
Journal of Instrumental Analysis
基金
浙江省自然科学基金资助项目!(297015)
关键词
冲洗色谱特征点
表面分形维数
硅胶
烷烃
吸附
Elution by characteristic points
Adsorption isotherm
Surface fractal dimension
