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Preparation of colloidal metals by reduction or precipitation in microheterogeneous fluids
YKI – Ytkemiska institutet.
1992 (English)In: Electrochemistry in Colloids and Dispersions / [ed] Mackay, R.A., & Texter, J., New York: VCH Publishers Inc. , 1992, 333-344 p.Chapter in book (Refereed)
Abstract [en]

Several methods of preparing colloidal particles of metals or metal oxides by reduction of salts dissolved in the water pools of microemulsions have been reported. These are briefly reviewed. In many cases the reduction is followed by aggregation of the precipitated material to colloidal particles that contain much larger numbers of metal atoms than those contained in each water pool. However, by judicious choice of systems and reaction conditions it appears possible to limit the initial reaction to each water pool. In such cases, the method offers the possibility to carry out the reduction under conditions corresponding to relatively concentrated electrolyte solutions in spite of the system as a whole being very dilute. Using this method it is also possible to prepare alloys of metals directly by reduction. This has been demonstrated for H2PtCl6 and PdCl2 in C12E5-hydrocarbon-water micro-emulsions. The state of the metal ions in the water pools was investigated by EXAFS. The results show that Pt and Pd do indeed form an alloy and that the coordination number for Pt and Pd in particles is lower than it is in bulk metal.

Place, publisher, year, edition, pages
New York: VCH Publishers Inc. , 1992. 333-344 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-13600OAI: oai:DiVA.org:ri-13600DiVA: diva2:989769
Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2016-09-29Bibliographically approved

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