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Surface tensions and contact angles due to lignin sulphonates in the system: Liquid sulphur, aqueous zinc sulphate and zinc sulphide
Author(s) -
Owusu George,
Peters Ernest,
Dreisinger David B.
Publication year - 1992
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.5450700125
Subject(s) - zinc , sulfur , aqueous solution , contact angle , surface tension , chemistry , adsorption , inorganic chemistry , materials science , organic chemistry , composite material , physics , quantum mechanics
Surface tension and contact angle measurements were made in the liquid sulphur‐aqueous zinc sulphate‐zinc sulphide system at superatmospheric pressures, and showed that, in the absence of surfactants, the liquid sulphur‐aqueous solution interfacial tension was 54.0 ± 1.0 mN/m, falling to 27.0‐30.0 mN/m when 0.3 g/L or more of lignin sulphonate was added to the solution. At the same time, the contact angle between liquid sulphur and the same solution increased from 80 ± 5° to 148 ± 5°. As a result, the work of adhesion between liquid sulphur and zinc sulphide falls from 63.7 mJ/m 2 to about 5.3 mJ/m 2 . The results indicate that adsorption of lignin sulphonate occurs on both the mineral‐aqueous and the sulphur‐aqueous interfaces.