Structural investigation of viscoelastic micellar water/CTAB/NaN0 3 solutions

K. Kuperkar; L. Abezgauz; D. Danino; G. Verma; P. A. Hassan; V. K. Aswal; D. Varade; P. Bahadur

doi:10.1007/s12043-008-0214-x

Structural investigation of viscoelastic micellar water/CTAB/NaN0 ₃ solutions

K. Kuperkar, L. Abezgauz, D. Danino, G. Verma, P. A. Hassan, V. K. Aswal, D. Varade, P. Bahadur^*

^*Corresponding author for this work

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

4 Scopus citations

Abstract

A highly viscoelastic worm-like micellar solution is formed in hexa-decyltrimethylammonium bromide (CTAB) in the presence of sodium nitrate (NaNO₃). A gradual increase in micellar length with increasing NaNO₃ was assumed from the rheological measurements where the zero-shear viscosity (η0) versus NaNO₃ concentration curve exhibits a maximum. However, upon increase in temperature, the viscosity decreases. Changes in the structural parameters of the micelles with addition of NaNO₃ were inferred from small angle neutron scattering measurements (SANS). The intensity of scattered neutrons in the low q region was found to increase with increasing NaNO₃ concentration. This suggests an increase in the size of the micelles and/or decrease of intermicellar interaction with increasing salt concentration. Analysis of the SANS data using prolate ellipsoidal structure and Yukawa form of interaction potential between micelles indicate that addition of NaNO₃ leads to a decrease in the surface charge of the ellipsoidal micelles which induces micellar growth. Cryo-TEM measurements support the presence of thread-like micelles in CTAB and NaNO₃.

Original language	English
Pages (from-to)	1003-1008
Number of pages	6
Journal	Pramana - Journal of Physics
Volume	71
Issue number	5
DOIs	https://doi.org/10.1007/s12043-008-0214-x
State	Published - Nov 2008
Externally published	Yes

Keywords

Cryo-TEM
Small angle neutron scattering
Viscoelasticity
Worm-like micelles

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10.1007/s12043-008-0214-x

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@article{eabf6ed8a7b74488885e4ca9a671a926,

title = "Structural investigation of viscoelastic micellar water/CTAB/NaN0 3 solutions",

abstract = "A highly viscoelastic worm-like micellar solution is formed in hexa-decyltrimethylammonium bromide (CTAB) in the presence of sodium nitrate (NaNO3). A gradual increase in micellar length with increasing NaNO3 was assumed from the rheological measurements where the zero-shear viscosity (η0) versus NaNO3 concentration curve exhibits a maximum. However, upon increase in temperature, the viscosity decreases. Changes in the structural parameters of the micelles with addition of NaNO3 were inferred from small angle neutron scattering measurements (SANS). The intensity of scattered neutrons in the low q region was found to increase with increasing NaNO3 concentration. This suggests an increase in the size of the micelles and/or decrease of intermicellar interaction with increasing salt concentration. Analysis of the SANS data using prolate ellipsoidal structure and Yukawa form of interaction potential between micelles indicate that addition of NaNO3 leads to a decrease in the surface charge of the ellipsoidal micelles which induces micellar growth. Cryo-TEM measurements support the presence of thread-like micelles in CTAB and NaNO3.",

keywords = "Cryo-TEM, Small angle neutron scattering, Viscoelasticity, Worm-like micelles",

author = "K. Kuperkar and L. Abezgauz and D. Danino and G. Verma and Hassan, {P. A.} and Aswal, {V. K.} and D. Varade and P. Bahadur",

note = "Funding Information: PB gratefully acknowledges CSIR-01(2068)/06/EMR-II and DD acknowledges the E&J Bishop Research Fund and the Israel Science Foundation for their support.",

year = "2008",

month = nov,

doi = "10.1007/s12043-008-0214-x",

language = "英语",

volume = "71",

pages = "1003--1008",

journal = "Pramana - Journal of Physics",

issn = "0304-4289",

publisher = "Springer India",

number = "5",

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TY - JOUR

T1 - Structural investigation of viscoelastic micellar water/CTAB/NaN0 3 solutions

AU - Kuperkar, K.

AU - Abezgauz, L.

AU - Danino, D.

AU - Verma, G.

AU - Hassan, P. A.

AU - Aswal, V. K.

AU - Varade, D.

AU - Bahadur, P.

N1 - Funding Information: PB gratefully acknowledges CSIR-01(2068)/06/EMR-II and DD acknowledges the E&J Bishop Research Fund and the Israel Science Foundation for their support.

PY - 2008/11

Y1 - 2008/11

N2 - A highly viscoelastic worm-like micellar solution is formed in hexa-decyltrimethylammonium bromide (CTAB) in the presence of sodium nitrate (NaNO3). A gradual increase in micellar length with increasing NaNO3 was assumed from the rheological measurements where the zero-shear viscosity (η0) versus NaNO3 concentration curve exhibits a maximum. However, upon increase in temperature, the viscosity decreases. Changes in the structural parameters of the micelles with addition of NaNO3 were inferred from small angle neutron scattering measurements (SANS). The intensity of scattered neutrons in the low q region was found to increase with increasing NaNO3 concentration. This suggests an increase in the size of the micelles and/or decrease of intermicellar interaction with increasing salt concentration. Analysis of the SANS data using prolate ellipsoidal structure and Yukawa form of interaction potential between micelles indicate that addition of NaNO3 leads to a decrease in the surface charge of the ellipsoidal micelles which induces micellar growth. Cryo-TEM measurements support the presence of thread-like micelles in CTAB and NaNO3.

AB - A highly viscoelastic worm-like micellar solution is formed in hexa-decyltrimethylammonium bromide (CTAB) in the presence of sodium nitrate (NaNO3). A gradual increase in micellar length with increasing NaNO3 was assumed from the rheological measurements where the zero-shear viscosity (η0) versus NaNO3 concentration curve exhibits a maximum. However, upon increase in temperature, the viscosity decreases. Changes in the structural parameters of the micelles with addition of NaNO3 were inferred from small angle neutron scattering measurements (SANS). The intensity of scattered neutrons in the low q region was found to increase with increasing NaNO3 concentration. This suggests an increase in the size of the micelles and/or decrease of intermicellar interaction with increasing salt concentration. Analysis of the SANS data using prolate ellipsoidal structure and Yukawa form of interaction potential between micelles indicate that addition of NaNO3 leads to a decrease in the surface charge of the ellipsoidal micelles which induces micellar growth. Cryo-TEM measurements support the presence of thread-like micelles in CTAB and NaNO3.

KW - Cryo-TEM

KW - Small angle neutron scattering

KW - Viscoelasticity

KW - Worm-like micelles

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U2 - 10.1007/s12043-008-0214-x

DO - 10.1007/s12043-008-0214-x

M3 - 文章

AN - SCOPUS:56449098465

SN - 0304-4289

VL - 71

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JO - Pramana - Journal of Physics

JF - Pramana - Journal of Physics

IS - 5

ER -

Structural investigation of viscoelastic micellar water/CTAB/NaN0 ₃ solutions

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Keywords

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