Structure and aggregation of lithium dodecyl sulphate micellar solutions in the presence of a macrocyclic cage
P Baglioni; A Bencini; L Dei; C M C Gambi; P Lo Nostroi; S H Chen; Y C Liu; J Teixeira; L Kevan; P Baglioni; Dept. of Chem., Florence Univ., Italy; A Bencini; Dept. of Chem., Florence Univ., Italy; L Dei; Dept. of Chem., Florence Univ., Italy; C M C Gambi; Dept. of Chem., Florence Univ., Italy; P Lo Nostroi; Dept. of Chem., Florence Univ., Italy; S H Chen; Dept. of Chem., Florence Univ., Italy; Y C Liu; Dept. of Chem., Florence Univ., Italy; J Teixeira; Dept. of Chem., Florence Univ., Italy; L Kevan; Dept. of Chem., Florence Univ., Italy
Журнал:
Journal of Physics: Condensed Matter
Дата:
1994-06-06
Аннотация:
We study the effects of addition of the macrocyclic cage CESTO (5,12,17-trimethyl-1,5,9,12,17-pentaazabicyclo (7.5.5)nonadecane) on the aggregation behaviour of lithium dodecylsulphate (LDS) in aqueous solution at a pH approximately=12.7. At this pH CESTO is neutral and binds selectively Li counter-ion. Electron spin-echo modulation results show that CESTO interacts with LDS micelles by decreasing the amount of water at the LDS polar headgroups region. Small-angle neutron scattering shows that LDS forms micelles of quasi-spherical shape. Upon addition of CESTO to 1% LDS micellar solution (1/1 mole ratio) we observed a dramatic lowering of the micellar charge, a small growth of the aggregation number, and increased elongation of micelles.
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