Radiolytic formation of Ag clusters in aqueous polyvinyl alcohol solution and hydrogel matrix

被引：69

作者：

Kumar, M ^{[1
]}

Varshney, L

Francis, S

机构：

[1] Bhabha Atom Res Ctr, Radiat Chem & Chem Dynam Div, Bombay 400085, Maharashtra, India

[2] Bhabha Atom Res Ctr, Radiat Technol Dev Sect, Bombay 400085, Maharashtra, India

来源：

RADIATION PHYSICS AND CHEMISTRY | 2005年 / 73卷 / 01期

关键词：

Ag clusters; gamma-radiolysis; polyvinyl alcohol; hydrogel; crosslinking;

D O I：

10.1016/j.radphyschem.2004.06.006

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：

Ag+ ions, in aqueous polyvinyl alcohol (PVA) solution and in PVA hydrogel matrix have been gamma radiolytically reduced to produce Ag clusters. UV-visible absorption spectral characteristics of Ag clusters obtained under different gamma dose, Ag+ concentration, PVA concentration and crosslinking density of the gel used have been studied. The effect of Ag+ ions on the radiation crosslinking of the PVA chains, have also been investigated by viscosity measurements. The radiation-induced Ag+ ion reduction was followed by crosslinking of the PVA chains. PVA was found to be a very efficient stabilizer to prevent aggregation of Ag clusters. The clusters produced in the hydrogel matrix were expected to be smaller than the pore size (similar to2-20 nm) of the gels used in the study. These Ag clusters were unable to reduce methyl viologen (MV2+) chloride and were stable in air. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：21 / 27

页数：7

共 20 条

[11] Study of formation of aqueous Tl/Ag bimetallic clusters by gamma and electron irradiation [J].

Kumar, M .

RADIATION PHYSICS AND CHEMISTRY, 2003, 66 (06) :403-409

[12] Study of formation of aqueous Tl, Cu and Cd clusters by γ- and electron irradiation [J].

Kumar, M .

RADIATION PHYSICS AND CHEMISTRY, 2002, 64 (02) :99-105

[13] REDUCTION OF PD(II) IN AQUEOUS-SOLUTION - STABILIZATION AND REACTIONS OF AN INTERMEDIATE CLUSTER AND PD COLLOID FORMATION [J].

MICHAELIS, M ;

HENGLEIN, A .

JOURNAL OF PHYSICAL CHEMISTRY, 1992, 96 (11) :4719-4724

[14] STUDY OF THE INTERACTION BETWEEN POLYACRYLATE AND SILVER OLIGOMER CLUSTERS [J].

MOSTAFAVI, M ;

DELCOURT, MO ;

PICQ, G .

RADIATION PHYSICS AND CHEMISTRY, 1993, 41 (03) :453-459

[15] ULTRA-SLOW AGGREGATION PROCESS FOR SILVER CLUSTERS OF A FEW ATOMS IN SOLUTION [J].

MOSTAFAVI, M ;

KEGHOUCHE, N ;

DELCOURT, MO ;

BELLONI, J .

CHEMICAL PHYSICS LETTERS, 1990, 167 (03) :193-197

[16] LONG-LIVED NONMETALLIC SILVER CLUSTERS IN AQUEOUS-SOLUTION - A PULSE-RADIOLYSIS STUDY OF THEIR FORMATION [J].

MULVANEY, P ;

HENGLEIN, A .

JOURNAL OF PHYSICAL CHEMISTRY, 1990, 94 (10) :4182-4188

[17] POLYVINYL-ALCOHOL) HYDROGELS - REINFORCEMENT OF RADIATION-CROSSLINKED NETWORKS BY CRYSTALLIZATION [J].

PEPPAS, NA ;

MERRILL, EW .

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 1976, 14 (02) :441-457

[18]

ROSIAK J, 1988, RADIAT PHYS CHEM, V32, P691

[19] Synthesis and properties of hydrogels from poly (vinyl alcohol) and ethylenediaminetetraacetic dianhydride [J].

Ruiz, J ;

Mantecón, A ;

Cádiz, V .

POLYMER, 2001, 42 (15) :6347-6354

[20] OH-RADICAL-INDUCED CROSS-LINKING AND STRAND BREAKAGE OF POLY(VINYL ALCOHOL) IN AQUEOUS-SOLUTION IN THE ABSENCE AND PRESENCE OF OXYGEN - A PULSE-RADIOLYSIS AND PRODUCT STUDY [J].

ULANSKI, P ;

BOTHE, E ;

ROSIAK, JM ;

VONSONNTAG, C .

MACROMOLECULAR CHEMISTRY AND PHYSICS, 1994, 195 (04) :1443-1461

← 1 2 →