Yan Yun, Hoffmann Heinz, Drechsler Markus, Talmon Yeshayahu, Makarsky Elena
BZKG (Bayreuther Zentrum für Kolloid und Grenzflächen), Makromolekfulare Chemie II, Universität Bayreuth, Bayreuth 95448, Germany.
J Phys Chem B. 2006 Mar 23;110(11):5621-6. doi: 10.1021/jp056894x.
Intermediate structures of the aggregates in the aqueous solution of an ABA-type silicone surfactant and in the process of an SDS-induced vesicle-micelle transition are reported. In single ABA silicone surfactant aqueous solutions, large multilamellar vesicles (MLV), small single lamellar vesicles (SLV), threadlike micelles (TLM), and spheroidal micelles were observed. Interestingly, a large amount of TLMs were found entrapped into the large MLVs, but not in SLVs. Disintegration of the small vesicles inside the MLVs indicates that the entrapped TLM are from the disintegrated membrane of the entrapped small vesicles. Addition of SDS induced a transition from vesicles or threadlike micelles to spheroidal micelles. The intermediate structures, such as the appearance of small holes in the vesicle membrane, the budding of threadlike micelles from the membrane fracture, and the clusters of spheroidal micelles, were observed with increase of the SDS concentration. The electrical conductivity measurements indicated that complex micelles of SDS and silicone surfactant were formed in the solution due to the interaction between the SDS and PEO part of the silicone surfactant.
报道了ABA型有机硅表面活性剂水溶液中聚集体的中间结构以及SDS诱导的囊泡-胶束转变过程。在单一ABA有机硅表面活性剂水溶液中，观察到了大的多层囊泡（MLV）、小的单层囊泡（SLV）、线状胶束（TLM）和球状胶束。有趣的是，发现大量的TLM被困在大的MLV中，而不在SLV中。MLV内部小囊泡的解体表明，被困的TLM来自被困小囊泡解体的膜。添加SDS会导致从囊泡或线状胶束向球状胶束的转变。随着SDS浓度的增加，观察到了中间结构，如囊泡膜上小孔的出现、线状胶束从膜破裂处的出芽以及球状胶束的聚集体。电导率测量表明，由于SDS与有机硅表面活性剂的PEO部分之间的相互作用，溶液中形成了SDS和有机硅表面活性剂的复合胶束。
