在这项研究中,我们在实验室中合成,纯化和表征了两种类型的阳离子表面活性剂。其中一个是一系列阳离子表面活性剂,一个是两个首尾相连的表面活性剂,N,N-二烷基-N,N-二乙基溴化铵,缩写为“ m -0- m ”(m = 10、12和16)。另一种是N,N'-二烷基-N,N,N ',N'-四甲基-N,N'-乙二基二溴化二铵,两个尾两个头的表面活性剂,缩写为“ m -2- m”(m = 12和16)。一旦获取了所有合成的双子表面活性剂的NMR光谱(1 H NMR,13 C NMR),然后测量熔融温度(T M)。这些表面活性剂具有非常高的表面活性。我们研究的主要目的是通过操纵它们的二聚体结构来检查这两种尾部阳离子表面活性剂的某些性能。研究了烷基链长和头基对溶液中表面活性剂自组装的影响。临界胶束浓度(CMC),胶束电离度(α)和克拉夫特温度(T K通过电导测量确定1wt%的这些表面活性剂的水溶液。发现
Support Curvature and Conformational Freedom Control Chemical Reactivity of Immobilized Species
摘要:
We show that bimolecular reactions between species confined to the surfaces of nanoparticles can be manipulated by the nature of the linker, as well as by the curvature of the underlying particles.
PERVAPORATION SEPARATION OF VOLATILE SILOXANES FROM EMULSIONS
申请人:DOW CORNING CORPORATION
公开号:EP1368109A2
公开(公告)日:2003-12-10
[EN] PERVAPORATION SEPARATION OF VOLATILE SILOXANES FROM EMULSIONS<br/>[FR] SEPARATION PAR PERVAPORATION DE SILOXANES VOLATILS D'EMULSIONS
申请人:DOW CORNING
公开号:WO2002070112A2
公开(公告)日:2002-09-12
A method of removing volatile siloxane oligomers form emulsions containing siloxane polymers. The method can be applied to any emulsion containing siloxane polymers, but it's especially adapted for removing residual volatile siloxane oligomers from emulsions containing siloxane polymers prepared by emulsion polymerization of the volatile siloxane oligomers. In particular, volatile siloxane oligomers are removed from emulsions containing siloxane polymers by pervaporation.