物理化学学报Issue(6)：1142-1147,6.DOI:10.3866/PKU.WHXB201404011
动态光散射研究盐对Gemini表面活性剂网状聚集体的影响
Salt Effects on the Network-Like Aggregates of Gemini Surfactant Studied by Dynamic Light Scattering
摘要
Abstract
The effects of different salts on the self-assembly of the carboxylate Gemini surfactant O,O′-bis (sodium 2-dodecylcarboxylate)-p-dibenzenediol (referred to as C12ϕ2C12) were studied using dynamic light scattering measurements. The results showed that the addition of salts induced the transition of the network-like aggregates into two new aggregates with smal (hydrodynamic radi Rh,app of several nanometers) and large (Rh,app>100 nm) sizes, which coexisted in solution. A solubilization test using a 1,6-diphenyl-1,3,5-hexatriene (DPH) probe confirmed that the smal aggregates were spherical micelles with a core-shel structure. Rheological measurements suggested that the large aggregates were threadlike micelles. The aggregate transition was attributed to the instability of the initial y formed network-like aggregates. The added counter-ions associated with the head-groups of C12ϕ2C12, which destroyed the hydrophile-lipophile balance and resulted in the aggregate transition. The salt effect fol owed the order:MgCl2>NaCl, Bu4NBr>Me4NBr>Et4NBr>Pr4NBr, where Bu4NBr is special and not in the order of electrostatic attraction since it provides an additional force through the hydrophobic interaction of its butyls with the alkyl tails of C12ϕ2C12.关键词
Gemini表面活性剂/长刚性联接链/网状聚集体/聚集体转变/盐效应Key words
Gemini surfactant/Long rigid spacer/Network-like aggregate/Aggregate transition/Salt effect分类
化学化工引用本文复制引用
刘芬,谢丹华,赵剑曦..动态光散射研究盐对Gemini表面活性剂网状聚集体的影响[J].物理化学学报,2014,(6):1142-1147,6.基金项目
The project was supported by the National Natural Science Foundation of China (20873024,21273040).国家自然科学基金(20873024,21273040)资助项目 （20873024,21273040）
