Electroaggregation of silver interfacial colloids

Leila Zeiri, Shlomo Efrima, Moshe Deutsch

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12 Scopus citations


Electric field-induced aggregation of interfacial colloids was studied in the absence and in the presence of ion deposition with special attention to the morphology and growth rates of the deposit and their implications for the nature of the underlying growth processes. The processes were studied as a function of several experimental parameters, namely, the magnitude of the voltage, the protocol of its application (DC, AC) the concentration and species of the metallic ions, the conductivity of the aqueous subphase, and the nature of the organic subphase. Pure electroaggregation was found to produce slowly developing and highly ramified structures. Pure electrodeposition of silver ions, when the colloid is absent, is similarly slow and produces compact disklike deposits, with rough edges (under most of the experimental conditions employed here). When both processes are active, a faster growth rate is observed, with a morphology between those of the two limiting processes. We suggest a cooperative mechanism for the growth process, bridge-aggregation, that combines aggregation and ion deposition, mutually accelerating each other, and that accounts well for the observed phenomena.

Original languageEnglish
Pages (from-to)9757-9766
Number of pages10
JournalJournal of Physical Chemistry B
Issue number47
StatePublished - 20 Nov 1997


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