Cyclodextrin as a capturing agent for redundant surfactants on Ag nanoparticle surface in phase transfer process |
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Authors: | Yang Yang Shuman Liu Keisaku Kimura |
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Institution: | aDepartment of Material Science, Graduate School of Science, University of Hyogo, 3-2-1 Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan |
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Abstract: | 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 β-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. |
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Keywords: | Phase transfer Ag nanoparticle Cyclodextrin Surfactant Self-assembly |
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