Sandwich Structures at Oil–Water Interfaces under Alkaline Conditions

Equilibrium liquid crystal (LC) layer on an interface between crude oils and water was observed at high pH. This layer is composed mainly of sodium naphthenates produced in situ at the water/oil interface. Transient LC layer was also evolved at the interface of aqueous phase of sodium hydroxide solu...

Full description

Saved in:
Bibliographic Details
Published inJournal of colloid and interface science Vol. 253; no. 2; pp. 427 - 434
Main Authors Horváth-Szabó, Géza, Czarnecki, Jan, Masliyah, Jacob H.
Format Journal Article
LanguageEnglish
Published San Diego, CA Elsevier Inc 15.09.2002
Elsevier
Subjects
Online AccessGet full text

Cover

Loading…
More Information
Summary:Equilibrium liquid crystal (LC) layer on an interface between crude oils and water was observed at high pH. This layer is composed mainly of sodium naphthenates produced in situ at the water/oil interface. Transient LC layer was also evolved at the interface of aqueous phase of sodium hydroxide solutions and oleic phase of naphthenic acid (NA) solutions as result of a chemical reaction between NaOH and NA. This chemical reaction causes transport process resulting in a disturbance of the interface. Optical observation of this interface disturbance reviled that the interface covered with LC shows considerably lower flexibility as compared to LC free interface. The LC layer eventually dissolves in the water phase at low oil-to-water ratio, while at high oil-to-water ratio it can form an equilibrium phase, which spreads spontaneously at the oil–water interface.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.2002.8524