STUDIES IN ADSORPTION .11. A SYSTEM OF CLASSIFICATION OF SOLUTION ADSORPTION ISOTHERMS, AND ITS USE IN DIAGNOSIS OF ADSORPTION MECHANISMS AND IN MEASUREMENT OF SPECIFIC SURFACE AREAS OF SOLIDS
STUDIES IN ADSORPTION .11. A SYSTEM OF CLASSIFICATION OF SOLUTION ADSORPTION ISOTHERMS, AND ITS USE IN DIAGNOSIS OF ADSORPTION MECHANISMS AND IN MEASUREMENT OF SPECIFIC SURFACE AREAS OF SOLIDS
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DOI：
10.1039/jr9600003973
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发表时间：
1960-01-01
期刊：
影响因子：
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通讯作者：
SMITH, D
中科院分区：
文献类型：
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作者：
GILES, CH;MACEWAN, TH;SMITH, D
主要类别是：（i）S曲线，表示吸附分子在表面的垂直方向。(ii)L曲线，正常或“朗缪尔”等温线，通常表示分子吸附在表面上，或者有时表示垂直取向的吸附离子具有特别强的分子间吸引力。(iii)H曲线（“I高亲和力”）（从“固体中的浓度”轴上的正值开始），通常由作为离子胶束吸附的溶质以及由高亲和力离子与低亲和力离子交换给出。(iv)C曲线（“恒定分配”），线性曲线，由比溶剂更容易渗透到固体中的溶质给出。这些类的子组根据远离原点的曲线部分的形状进行排列，并描述了高原和斜率变化的意义。因此，如果单层中吸附的溶质分子的取向使得它们呈现给溶液的新表面对更多的溶质分子具有低吸引力，则曲线具有长的平台;如果它们的取向使得新表面对更多的溶质具有高吸引力，则曲线稳定上升并且没有平台。用于可靠测量比表面积的溶质的选择非常有限。对硝基苯酚可能是最好的化合物之一。
The main classes are:(i) S Curves, indicative of vertical orientation of adsorbed molecules at the surface.(ii) L Curves, the normal or “Langmuir” isotherms, usually indicative of molecules adsorbed flat on the surface, or, sometimes, of vertically oriented adsorbed ions with particularly strong intermolecular attraction.(iii) H Curves (‘I high affinity”)(commencing at a positive value on the “concentration in solid” axis), often given by solutes adsorbed as ionic micelles, and by high-affinity ions exchanging with lowaffinity ions.(iv) C Curves (“constant partition”), linear curves, given by solutes which penetrate into the solid more readily than does the solvent. The sub-groups of these classes are arranged according to the shape of the parts of the curves farther from the origin, and the significance of plateaux and changes of slope are described. Thus, if the adsorbed solute molecules in the monolayer are so oriented that the new surface they present to the solution has low attraction for more solute molecules, the curve has a long plateau; if they are oriented so that the new surface has high attraction for more solute, the curve rises steadily and has no plateau. The choice of solutes for reliable measurement of specific surface areas is very restricted. It is suggested that p-nitrophenol may be one of the best compounds for this purpose.