期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 290, 期 1-3, 页码 143-149出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2006.05.016
关键词
phase transfer; Ag nanoparticle; cyclodextrin; surfactant; self-assembly
High-yield phase transfer of hydrophilic mercaptosuccinic acid (MSA)-modified Ag nanoparticles into chloroform is readily attained using cetyltrimethylammonium bromide (CTAB) through electrostatic interaction. Increasing CTAB amount to a certain degree has achieved nearly complete phase transfer due to the sufficient formation of stoichiometric ion-pairs on particle surface. However, at high CTAB concentration, some unbonded CTA(+) cations will be physically adsorbed on particle surface and enter chloroform layer simultaneously, which cannot be removed by simple water washing or centrifugation. By using P-cyclodextrin (CD) as a capturing agent, this portion of CTA(+) cations can be adequately removed due to the possible inclusion function of CD. Upon removal of the unbonded CTAB, the monolayer formation of phase-transferred Ag nanoparticles at air-water interface presents improved two-dimensional (2D) orderliness owing to the more effective interdigitation among adjacent particles. (c) 2006 Elsevier B.V. All rights reserved.
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