摘要
用芘(Py)荧光探针法测定了添加少量十六烷基三甲基溴化胺(CTAB)后,十二烷基硫酸钠(SDS)的临界胶束浓度(CMC)和胶束聚集数(Nm)。在一定范围内,SDS的CMC与CTAB的添加量〔x=c(CTAB)/c(SDS)〕有如下定量关系:ln〔CMC/(mmol/L)〕=0.69-10.48x。当x=1/80时,SDS的胶束聚集数为92。x=1/40时,SDS的胶束聚集数为122。SDS的胶束聚集数随着CTAB的添加量迅速增加。因此,阴阳离子混合表面活性剂作为合成介孔催化剂的模板剂,可以调控介孔催化剂的孔径大小。
The critical micelle concentrations and aggregation numbers of sodium dodecyl sulfates (SDS) mixed with different low molar ratio of cetyhrimethylammonium bromide (CTAB) were tested by pyrene fluorescence probe method. The CMC of SDS has quantitative relationship with the molar ratio of x[x = c( CTAB)/c(SDS) ] :ln[ CMC/(mmol/L) ] =0. 69 - 10. 48x. The aggregation number of SDS is 92 when x = 1/80 ,and 122 when x = 1/40. This indicates that the aggregation number increases with x. Anionic-cationic surfactant composite system served as the template in the synthesis of mesoporous catalyst can control the pore size of mesoporous catalyst.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2007年第3期225-227,286,共4页
Fine Chemicals
基金
湖南省教育厅科研项目(01C383
02C525)
关键词
临界胶束浓度
胶束聚集数
荧光探针法
SDS
CTAB
critical micelle concentration
micelle aggregation number
fluorescence probe method
sodium dodecyl sulfate
cetyltrimethylammonium bromide