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A filtration method for measuring particle interactions in latexes
Author(s) -
Homola A. M.,
Robertson A. A.
Publication year - 1975
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.5450530406
Subject(s) - coagulation , dispersity , filtration (mathematics) , colloid , pulmonary surfactant , materials science , particle size , electrolyte , particle (ecology) , styrene , chemistry , chemical engineering , chromatography , polymer , analytical chemistry (journal) , polymer chemistry , composite material , copolymer , mathematics , organic chemistry , psychology , biochemistry , statistics , psychiatry , oceanography , electrode , engineering , geology
The repulsion forces between latex particles determine the stability of the latex. These may be estimated by determining, by a filtration method, the minimum pressure required to initiate coagulation. This minimum filtration pressure, when corrected for the resistance of the filter, was found to be independent of the pore size of the filter and of the amount and concentration of the latex. Experiments were conducted with both film‐forming (styrene‐butadiene) and non‐film forming (styrene) latexes. The method provides a simple and convenient means of assessing the colloid stability of suspensions of larger particles. With model, monodisperse latexes the method permits the comparison of measured interparticle forces with those predicted by theory. The minimum coagulation pressure and the electrophoretic mobility curves correlate well when plotted against pH or electrolyte concentration. A maximum in the minimum coagulation pressure curve occurs at 10 −3 M NaCl. The critical pressure increases with an increase in the concentration of nonionic surfactant (C 18 E 50 ) while the mobility decreases.