摘要
采用超滤法和原子吸收分光光度法对外加碱金属(锂、钠或钾)硫酸盐的十二烷基硫酸钠-聚乙二醇软团簇体系进行研究.实验结果表明,其超滤曲线与表面张力曲线相似,也存在双拐点(c1和c2), 且c1随外加电解质浓度增加而降低,c2随外加电解质浓度增加而增加. 因而软团簇形成的边界随外加电解质浓度增加而变宽,表明十二烷基硫酸钠与聚乙二醇间具有更显著的团簇化作用.外加碱金属(锂或钾)离子在软团簇上的缔合量与软团簇中表面活性离子含量之比随该金属离子的浓度增加而增加.在相同外加碱离子浓度下,钾离子在软团簇上的缔合量大于锂离子在软团簇上的缔合量,这是由于锂水合离子半径较钾水合离子半径大的缘故.
The mixed systems composed of lithium sulfate (Li (2)SO (4)), Sodium sulfate (Na (2)SO (4)) or potassium sulfate (K (2)SO (4)) with soft matter cluster of sodium dodecyl sulfate (SDS) polyethylene glycol (PEG) were studied by ultra-filtration and atomic absorption spectrophotometry. The results showed that the double critical concentrations (c (1 )and c (2)) could be found in c (uf )-c curves of the above systems just like in the corresponding γ-lgc curve. The first critical concentration c (1) decreased while the second critical concentration c (2) increased with ever-increasing lever of alkali metal ions, so that the clusterization boundary of SDS-PEG was expanded. This means that clusterization between SDS and PEG became more intensive. The ratio (β) of alkali metal ion to SDS in soft matter cluster increased with the lever of alkali metal ions. The capacity of potassium ion associated with soft matter cluster was higher than that of lithium ion under the same ion concentration spectrophotometry. This is because the radius of lithium hydrated ion is longer than that of potassium.
出处
《江南大学学报（自然科学版）》
CAS
2005年第1期76-79,共4页
Joural of Jiangnan University (Natural Science Edition)
基金
国家自然科学基金项目(20371021)资助课题.
