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The coalescence of n‐Hexane droplets in aqueous electrolyte solutions
Author(s) -
Sagert Norman H.,
Quinn Michael J.
Publication year - 1978
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450560605
Subject(s) - coalescence (physics) , electrolyte , aqueous solution , limiting , chemistry , strong electrolyte , thermodynamics , chemical engineering , analytical chemistry (journal) , chromatography , physics , mechanical engineering , electrode , astrobiology , engineering
Abstract Coalescence times, measured by high speed cinematography, are reported for n‐hexane droplets formed on adjacent nozzles in pure water and in dilute aqueous solutions of the electrolytes KCl, KBr, KI, NaCl, and Na 2 SO 4 . Coalescence times in pure water were 17 + 11 ms, in satisfactory agreement with recent theories of Ivanov and of Reed, Riolo and Hartland. Coalescence times increased on addition of electrolytes, except for KI. Limiting values of coalescence times in electrolyte solutions could be accounted for by the theories of Marrucci. Thus the Marrucci parameter crk 2 /λ may be taken as a guide to droplet coalescence in solutions of solutes such as electrolytes which only change interfacial tensions slightly. The coalescence times are larger than for air‐electrolyte solutions, largely because of the lower Hamaker‐London attraction with the present system.