Resolving the puzzle of ferrofluid dispersants

Rafael Tadmor; Ronald E. Rosensweig; Joseph Frey; Jacob Klein

doi:10.1021/la0009137

Resolving the puzzle of ferrofluid dispersants

Rafael Tadmor, Ronald E. Rosensweig, Joseph Frey, Jacob Klein

Research output: Contribution to journal › Article › peer-review

151 Scopus citations

Abstract

Oleic acid and stearic acid are similar surfactants which, however, lead respectively to stability and to precipitation of ferrofluid suspensions: to understand this, the forces between layers of oleic-like surfactants and between layers of stearic-like surfactants across a hexadecane (HD) medium were measured using a surface force balance (SFB). Separate measurements reveal that only the oleic layers are solvated by HD, while the SFB results reveal that for both surfactants a marked net attraction is present between the surfaces. Simple considerations based on these observations explain why, despite this attraction, ferrofluid dispersions are stabilized by oleic but not by stearic surfactants.

Original language	English
Pages (from-to)	9117-9120
Number of pages	4
Journal	Langmuir
Volume	16
Issue number	24
DOIs	https://doi.org/10.1021/la0009137
State	Published - 28 Nov 2000
Externally published	Yes

ASJC Scopus subject areas

Materials Science (all)
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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10.1021/la0009137

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abstract = "Oleic acid and stearic acid are similar surfactants which, however, lead respectively to stability and to precipitation of ferrofluid suspensions: to understand this, the forces between layers of oleic-like surfactants and between layers of stearic-like surfactants across a hexadecane (HD) medium were measured using a surface force balance (SFB). Separate measurements reveal that only the oleic layers are solvated by HD, while the SFB results reveal that for both surfactants a marked net attraction is present between the surfaces. Simple considerations based on these observations explain why, despite this attraction, ferrofluid dispersions are stabilized by oleic but not by stearic surfactants.",

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AU - Rosensweig, Ronald E.

AU - Frey, Joseph

AU - Klein, Jacob

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Y1 - 2000/11/28

N2 - Oleic acid and stearic acid are similar surfactants which, however, lead respectively to stability and to precipitation of ferrofluid suspensions: to understand this, the forces between layers of oleic-like surfactants and between layers of stearic-like surfactants across a hexadecane (HD) medium were measured using a surface force balance (SFB). Separate measurements reveal that only the oleic layers are solvated by HD, while the SFB results reveal that for both surfactants a marked net attraction is present between the surfaces. Simple considerations based on these observations explain why, despite this attraction, ferrofluid dispersions are stabilized by oleic but not by stearic surfactants.

AB - Oleic acid and stearic acid are similar surfactants which, however, lead respectively to stability and to precipitation of ferrofluid suspensions: to understand this, the forces between layers of oleic-like surfactants and between layers of stearic-like surfactants across a hexadecane (HD) medium were measured using a surface force balance (SFB). Separate measurements reveal that only the oleic layers are solvated by HD, while the SFB results reveal that for both surfactants a marked net attraction is present between the surfaces. Simple considerations based on these observations explain why, despite this attraction, ferrofluid dispersions are stabilized by oleic but not by stearic surfactants.

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Resolving the puzzle of ferrofluid dispersants

Abstract

ASJC Scopus subject areas

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