Abstract
The role of colloidal semiconductor particles as photocatalysts in some environmentally important reactions, and the importance of the nature of the particle surface during such reactions is discussed. A summary of semiconductor particle-related electrochemical concepts is presented and the potential of electrophoresis for insitu non-perturbative interrogation of particle surface behaviour is described. The new technique of photoelectrophoresis and its utility in photocolloidal systems is also described. Finally, some recent advances in the field of semiconductor colloid chemistry are presented, with emphasis on those systems for which particle surface charge-related information would prove most useful.
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