阴离子表面活性剂和β-环糊精包结作用

环糊精由于其特殊结构可与众多物质(客体分子)形成包结物,这种包结物在化学理论研究、化工工业、农业及医药等领域有广阔的应用前景1、2],因而受到人们极大的关注.人们用电导法、核磁技术、表面张力法等研究了环糊精与阴离子表面活性剂的相互作用,但这些方法得出的结果很...

The Association of Anionic Surfactants with β-cyclodextrin

The association of a series of anionic surfactants (C n H 2 n +1 SO 3Na, n =5,8,10,12,14) with β-cyclodextrin was studied by means of the isothermal titration calorimeter(ITC) at 298.15 K. For these type of inclusion complexes, the results agreed well with a 1:1 association model. Apparent values for the association constants, and changes in the standard molar Gibbs energies, enthalpies, entropies ,were derived for the association process. The results indicated that the association of surfactants with β-cyclodextrin are favorable by both enthalpy and entropy changes. The results also indicated that -Δ GΘincrease steadily with an increasing of alkyl chain length of the surfactants. The results also demonstrated that the longer chain tail of surfactant, the greater the association constant with β-cyclodextrin .