Guest molecules in Triton X-100 microemulsion: studied by positron annihilation technique and absorption spectroscopy

被引：3

作者：

Das, SK ^{[1
]}

Ganguly, BN ^{[1
]}

机构：

[1] Saha Inst Nucl Phys, Atom & Nucl Phys Div, Calcutta 700064, W Bengal, India

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2000年 / 168卷 / 01期

关键词：

Triton X-100; microemulsion; uranyl ion; p-nitro phenol; positron annihilation; absorption spectroscopy;

D O I：

10.1016/S0927-7757(99)00527-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Positron annihilation lifetime measurements have been performed in water in oil (w/o) microemulsion (ME) of Triton X-100/butanol, n-heptane system in the presence of additives, UO2+2 and p-nitro phenol (PNP). The microenvironment of the guest molecules in the ME phase was studied by the positronium (Ps) reaction-rate constant. The Ps reaction rate constant values with UO2+2 in ME changed gradually as a function of water content in ME phase where as a considerable enhancement of Ps reaction rate constants with PNP was observed in the same phase. Furthermore. the solubilization of the probe molecules in the different microphase of the ME system was investigated through the UV-VIS absorption spectra. The results show that UO2+2 ions were preferentially occupied in the polar water pool of ME but PNP molecules were distributed in the interfacial region (intermediate polarity) of the ME phase. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：53 / 60

页数：8

共 29 条

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