Transient electric birefringence study of rod-shaped water-in-oil microemulsions

Francesco Mantegazza; Vittorio Degiorgio; Mario E. Giardini; A. Louise Price; David C. Steytler; Brian H. Robinson

doi:10.1021/la970888d

Transient electric birefringence study of rod-shaped water-in-oil microemulsions

Francesco Mantegazza
, Vittorio Degiorgio
, Mario E. Giardini
, A. Louise Price
, David C. Steytler
, Brian H. Robinson

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

18 Citations (Scopus)

Abstract

Transient electric birefringence (TEB) studies have been carried out on water-in-oil w/o microemulsions stabilized by Ni(AOT)₂, the nickel salt of bis(ethylhexyl) sulfosuccinate. The system forms rod-shaped droplets at low water contents which convert to more spherical aggregates as the water content is increased. TEB data have been obtained as a function of microemulsion volume fraction, φ, water content, and temperature. Relaxation transients of the electric birefringence signal were found to be nonexponential, following asymptotically a stretched-exponential behavior. The value of the stretching exponent at low volume fraction is consistent with the assumption that the length probability distribution is exponential. A model describing the Kerr response of the microemulsion droplets is developed. By using this model we derive the specific Kerr constant as a function of the volume fraction, finding a good agreement with the experimentally observed behavior. We also use the model to derive, from the initial slope of the relaxation, the mean rod length L_m. It is found that Lm grows approximately as the square root of φ. Values for L_m obtained from TEB are in good agreement with those obtained from small-angle neutron scattering measurements.

Original language	English
Pages (from-to)	1-7
Number of pages	7
Journal	Langmuir
Volume	14
Issue number	1
DOIs	https://doi.org/10.1021/la970888d
Publication status	Published - 6 Jan 1998

Keywords

Liquids
Optical properties
Electrical properties
Emulsions
Micelles

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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10.1021/la970888d

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title = "Transient electric birefringence study of rod-shaped water-in-oil microemulsions",

abstract = "Transient electric birefringence (TEB) studies have been carried out on water-in-oil w/o microemulsions stabilized by Ni(AOT)2, the nickel salt of bis(ethylhexyl) sulfosuccinate. The system forms rod-shaped droplets at low water contents which convert to more spherical aggregates as the water content is increased. TEB data have been obtained as a function of microemulsion volume fraction, φ, water content, and temperature. Relaxation transients of the electric birefringence signal were found to be nonexponential, following asymptotically a stretched-exponential behavior. The value of the stretching exponent at low volume fraction is consistent with the assumption that the length probability distribution is exponential. A model describing the Kerr response of the microemulsion droplets is developed. By using this model we derive the specific Kerr constant as a function of the volume fraction, finding a good agreement with the experimentally observed behavior. We also use the model to derive, from the initial slope of the relaxation, the mean rod length Lm. It is found that Lm grows approximately as the square root of φ. Values for Lm obtained from TEB are in good agreement with those obtained from small-angle neutron scattering measurements.",

keywords = "Liquids, Optical properties, Electrical properties, Emulsions, Micelles",

author = "Francesco Mantegazza and Vittorio Degiorgio and Giardini, \{Mario E.\} and Price, \{A. Louise\} and Steytler, \{David C.\} and Robinson, \{Brian H.\}",

note = "Copyright {\textcopyright} 1998 American Chemical Society",

year = "1998",

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doi = "10.1021/la970888d",

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T1 - Transient electric birefringence study of rod-shaped water-in-oil microemulsions

AU - Mantegazza, Francesco

AU - Degiorgio, Vittorio

AU - Giardini, Mario E.

AU - Price, A. Louise

AU - Steytler, David C.

AU - Robinson, Brian H.

PY - 1998/1/6

Y1 - 1998/1/6

N2 - Transient electric birefringence (TEB) studies have been carried out on water-in-oil w/o microemulsions stabilized by Ni(AOT)2, the nickel salt of bis(ethylhexyl) sulfosuccinate. The system forms rod-shaped droplets at low water contents which convert to more spherical aggregates as the water content is increased. TEB data have been obtained as a function of microemulsion volume fraction, φ, water content, and temperature. Relaxation transients of the electric birefringence signal were found to be nonexponential, following asymptotically a stretched-exponential behavior. The value of the stretching exponent at low volume fraction is consistent with the assumption that the length probability distribution is exponential. A model describing the Kerr response of the microemulsion droplets is developed. By using this model we derive the specific Kerr constant as a function of the volume fraction, finding a good agreement with the experimentally observed behavior. We also use the model to derive, from the initial slope of the relaxation, the mean rod length Lm. It is found that Lm grows approximately as the square root of φ. Values for Lm obtained from TEB are in good agreement with those obtained from small-angle neutron scattering measurements.

AB - Transient electric birefringence (TEB) studies have been carried out on water-in-oil w/o microemulsions stabilized by Ni(AOT)2, the nickel salt of bis(ethylhexyl) sulfosuccinate. The system forms rod-shaped droplets at low water contents which convert to more spherical aggregates as the water content is increased. TEB data have been obtained as a function of microemulsion volume fraction, φ, water content, and temperature. Relaxation transients of the electric birefringence signal were found to be nonexponential, following asymptotically a stretched-exponential behavior. The value of the stretching exponent at low volume fraction is consistent with the assumption that the length probability distribution is exponential. A model describing the Kerr response of the microemulsion droplets is developed. By using this model we derive the specific Kerr constant as a function of the volume fraction, finding a good agreement with the experimentally observed behavior. We also use the model to derive, from the initial slope of the relaxation, the mean rod length Lm. It is found that Lm grows approximately as the square root of φ. Values for Lm obtained from TEB are in good agreement with those obtained from small-angle neutron scattering measurements.

KW - Liquids

KW - Optical properties

KW - Electrical properties

KW - Emulsions

KW - Micelles

UR - https://www.scopus.com/pages/publications/0032488489

U2 - 10.1021/la970888d

DO - 10.1021/la970888d

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AN - SCOPUS:0032488489

SN - 0743-7463

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JO - Langmuir

JF - Langmuir

IS - 1

ER -

Transient electric birefringence study of rod-shaped water-in-oil microemulsions

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Keywords

ASJC Scopus subject areas

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