Characterization of a water-in-oil microemulsion containing a concentrated ammonium ferric sulfate aqueous phase

A water-in-oil (w/o) microemulsion containing high concentrations of ammonium ferric sulfate in solution was characterized by SAXS, EXAFS, electrical conductivity, and viscosity measurements and by its phase behavior. The nanometer-sized aqueous droplets are microemulsified by sodium bis(2-ethylhexy...

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Veröffentlicht in:Langmuir 1994-01, Vol.10 (1), p.135-141
Hauptverfasser: Darab, John G, Pfund, David M, Fulton, John L, Linehan, John C, Capel, Malcolm, Ma, Yanjun
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container_title Langmuir
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creator Darab, John G
Pfund, David M
Fulton, John L
Linehan, John C
Capel, Malcolm
Ma, Yanjun
description A water-in-oil (w/o) microemulsion containing high concentrations of ammonium ferric sulfate in solution was characterized by SAXS, EXAFS, electrical conductivity, and viscosity measurements and by its phase behavior. The nanometer-sized aqueous droplets are microemulsified by sodium bis(2-ethylhexyl) sulfosuccinate (AOT) in an isooctane continuous phase. Addition of small amounts of sodium dodecyl sulfate (SDS) as a cosurfactant greatly aids in the solubilization of the inorganic electrolyte-laden aqueous phase. For this five-component system there is a large region of the composition phase space that exists as a clear, stable w/o microemulsion. A portion of this w/o microemulsion phase space can be characterized as spherically shaped aqueous nanometer-sized droplets. A simple relationship between the total surfactant concentration and the amount of water on the droplet size was established. This relationship has the same form as the well-known relationship for the ternary system, AOT/water/isooctane. True thermodynamic equilibrium was not established in this microemulsion study because the reaction times for the various ferric oxyhydroxide species are prohibitively long. As a result, pseudoequilibria for this ammonium ferric sulfate microemulsion are reported. 31 refs., 7 figs., 1 tab.
doi_str_mv 10.1021/la00013a020
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Foams</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY</topic><topic>IONIZING RADIATIONS</topic><topic>IRON COMPOUNDS</topic><topic>MATERIALS SCIENCE</topic><topic>MICROEMULSIONS</topic><topic>OXYGEN COMPOUNDS</topic><topic>PHASE DIAGRAMS</topic><topic>PHYSICAL PROPERTIES</topic><topic>RADIATIONS</topic><topic>SCATTERING</topic><topic>SULFATES</topic><topic>SULFUR COMPOUNDS</topic><topic>SURFACTANTS</topic><topic>TRANSITION ELEMENT COMPOUNDS</topic><topic>VISCOSITY</topic><topic>X RADIATION</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Darab, John G</creatorcontrib><creatorcontrib>Pfund, David M</creatorcontrib><creatorcontrib>Fulton, John L</creatorcontrib><creatorcontrib>Linehan, John C</creatorcontrib><creatorcontrib>Capel, Malcolm</creatorcontrib><creatorcontrib>Ma, Yanjun</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Langmuir</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Darab, John G</au><au>Pfund, David M</au><au>Fulton, John L</au><au>Linehan, John C</au><au>Capel, Malcolm</au><au>Ma, Yanjun</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Characterization of a water-in-oil microemulsion containing a concentrated ammonium ferric sulfate aqueous phase</atitle><jtitle>Langmuir</jtitle><addtitle>Langmuir</addtitle><date>1994-01-01</date><risdate>1994</risdate><volume>10</volume><issue>1</issue><spage>135</spage><epage>141</epage><pages>135-141</pages><issn>0743-7463</issn><eissn>1520-5827</eissn><coden>LANGD5</coden><abstract>A water-in-oil (w/o) microemulsion containing high concentrations of ammonium ferric sulfate in solution was characterized by SAXS, EXAFS, electrical conductivity, and viscosity measurements and by its phase behavior. 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subjects 360602 - Other Materials- Structure & Phase Studies
400201 - Chemical & Physicochemical Properties
AMMONIUM COMPOUNDS
Chemistry
Colloidal state and disperse state
COLLOIDS
DIAGRAMS
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
EMULSIONS
Emulsions. Microemulsions. Foams
Exact sciences and technology
General and physical chemistry
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
IONIZING RADIATIONS
IRON COMPOUNDS
MATERIALS SCIENCE
MICROEMULSIONS
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHYSICAL PROPERTIES
RADIATIONS
SCATTERING
SULFATES
SULFUR COMPOUNDS
SURFACTANTS
TRANSITION ELEMENT COMPOUNDS
VISCOSITY
X RADIATION
title Characterization of a water-in-oil microemulsion containing a concentrated ammonium ferric sulfate aqueous phase
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