Coalescence (chemistry)

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In chemistry, coalescence is a process in which two phase domains of the same composition come together and form a larger phase domain.

IUPAC definition

Disappearance of the boundary between two particles in contact, or between a particle
and a polymer macrophase followed by changes of shape leading to a reduction of the
total surface area.

Note 1: Definition modified from that in ref.[1]

Note 2: The coagulation of an emulsion, viz. the formation of aggregates, may be followed
by coalescence. If coalescence is extensive it leads to the breaking of an emulsion.[2]


  1. ^ Alan D. MacNaught, Andrew R. Wilkinson, ed. (1997). Compendium of Chemical Terminology: IUPAC Recommendations (2nd ed.). Oxford: Blackwell Science. ISBN 0865426848. 
  2. ^ "Terminology of polymers and polymerization processes in dispersed systems (IUPAC Recommendations 2011)". Pure and Applied Chemistry 83 (12): 2229–2259. 2011. doi:10.1351/PAC-REC-10-06-03.