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A strategy for synthesis of polymer‐protective bimetallic colloids
Author(s) -
Wang Yuan,
Gui LinLin,
Tang YouQi
Publication year - 1994
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19940120102
Subject(s) - bimetallic strip , chemistry , colloid , polymer , chemical engineering , transition metal , metal , particle (ecology) , noble metal , polymer chemistry , nanotechnology , catalysis , organic chemistry , materials science , oceanography , geology , engineering
A strategy for the synthesis of polymer‐protective bimetallic sols is proposed which has the advantage of the strong protective effect of the polymer agent on one of the composites to stabilize the bimetallic colloidal particles. This strategy is certified to be useful to the predication of the formation of stable bimetallic colloids protected by polymer and to the control of the particle size to a certain extent. A series of new PVP‐protective bimetallic colloidal dispersions containing noble metal element (Pt, Rh, Pd), light transition metal element (Co, Fe), and boron are obtained from the corresponding salts by the methods of reduction by stage and coreduction, using the NaBH4 as reductant. The TEM, XRD and EPMA measurements indicate the formation of bimetallic colloids. An interesting kind of coil aggregation is observed in the systems of PVP‐Pt‐Co and PVP‐Rh‐Co prepared by the method of reduction by stage.