Phase diagrams of non-ionic microemulsions containing reducing agents and metal salts as bases for the synthesis of bimetallic nanoparticles

Files in This Item:
File Description SizeFormat 
COLUSA 2009 CS.pdf289.11 kBAdobe PDFDownload
Title: Phase diagrams of non-ionic microemulsions containing reducing agents and metal salts as bases for the synthesis of bimetallic nanoparticles
Authors: Magno, Miguel
Angelescu, Daniel G.
Stubenrauch, Cosima
Permanent link:
Date: Sep-2009
Online since: 2011-01-13T17:13:54Z
Abstract: Phase diagrams of microemulsions containing metal salt(s) and reducing agent, respectively, were studied in detail. The microemulsions were based on non-ionic surfactants, namely pure tetraethyleneglycol monododecylether, C12E4, and technical grade Brij30. We studied the influence of the metal salts H2PtCl6, Pb(NO3)2, Bi(NO3)3, H2PtCl6 + Pb(NO3)2 (1:1 mixture), and H2PtCl6 + Bi(NO3)3 (1:1 mixture) as well as of the reducing agent NaBH4 on the location of the phase boundaries. The focus was on the water emulsification failure boundary (wefb) where the aqueous phase forms spherical droplets. The temperature shifts of the wefb, which were caused by the presence of the salt(s), are directly related with the shift of the clouding points of the corresponding oil-free systems. The location of the wefb is affected in a complex manner by the pH (the lower the pH the higher the temperature at which the wefb occurred), the ionic strength and by specific salting-in or salting-out effects of the electrolyte ions. The desired overlap of the wefb of the microemulsions containing the metal salt(s) and the reducing agent, respectively, could be achieved by adding NaOH to the C12E4-based microemulsions and by titrating 1-octanol to the Brij30-based microemulsions, respectively.
Funding Details: Science Foundation Ireland
Other funder
Type of material: Journal Article
Publisher: Elsevier
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume: 348
Issue: 1-3
Start page: 116
End page: 123
Copyright (published version): 2009 Elsevier B.V.
Keywords: Water emulsification failure boundaryFunnel phase diagramsNon-ionic surfactantsw/o-microemulsions as nanoreactorsMonometallic and bimetallic nanoparticles
Subject LCSH: Emulsions
Phase diagrams
Surface active agents
DOI: 10.1016/j.colsurfa.2009.07.002
Other versions:
Language: en
Status of Item: Peer reviewed
Appears in Collections:Solar Energy Conversion (SEC) Cluster Research Collection
CSCB Research Collection

Show full item record

Citations 20

Last Week
Last month
checked on Feb 11, 2019

Page view(s) 20

checked on May 25, 2018

Download(s) 10

checked on May 25, 2018

Google ScholarTM



This item is available under the Attribution-NonCommercial-NoDerivs 3.0 Ireland. No item may be reproduced for commercial purposes. For other possible restrictions on use please refer to the publisher's URL where this is made available, or to notes contained in the item itself. Other terms may apply.