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Phase behavior and rheology of mixed nonionic sugar-based surfactants

The rheological properties of 40/60, 30/70, and 20/80 by weight ratio of methyl glucose sesquistearate (glucate SS) and PEG-20 methyl glucose sesquistearate (glucamate SSE-20) at 1-phase (Lα) and 2-phase (L1 + Lα) region were studied. These regions are fully developed lamellar liquid crystal (Lα) ra...

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Main Authors: Ismail, Zahariah, Kassim, Anuar, Suhaimi, Hamdan, Ahmad, Salmiah
Format: Article
Published: Taylor and Francis Group 2002
Online Access:http://psasir.upm.edu.my/id/eprint/115379/
https://www.tandfonline.com/doi/abs/10.1081/DIS-120015974
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spelling my.upm.eprints.1153792025-03-04T00:28:09Z http://psasir.upm.edu.my/id/eprint/115379/ Phase behavior and rheology of mixed nonionic sugar-based surfactants Ismail, Zahariah Kassim, Anuar Suhaimi, Hamdan Ahmad, Salmiah The rheological properties of 40/60, 30/70, and 20/80 by weight ratio of methyl glucose sesquistearate (glucate SS) and PEG-20 methyl glucose sesquistearate (glucamate SSE-20) at 1-phase (Lα) and 2-phase (L1 + Lα) region were studied. These regions are fully developed lamellar liquid crystal (Lα) ranging from 29-31% water, lamella liquid crystal, and isotropic matrix which is closed Lα region (L1 + Lα) ranging from 16-19% water, and lamella liquid crystal in which birefringence is not prominent and isotropic matrix (L1 + Lα)′ ranging from 34-44% water. The viscosity, yield value and thixotropy behavior were studied at 80°C using a Brookfield viscometer. A pseudoplastic behavior exhibits at all the phases for mixed surfactants. The viscosity of mixed surfactants indicated as fall in the following order Lα> (L1 + Lα)′ > (L1 + Lα). The yield values of 40/60 and 20/80 exhibit the same ranking as the viscosity but not for 30/70. The highest plastic viscosity was observed in Lα region. The consistency index or viscosity index increased at Lα and it decreased in the flow index (flow index to describe the flow-curve, i.e., Newtonian, dilatant, pseudoplastic or plastic). The thixotropy behavior in that required a longer time to recover its structure of mixed surfactants showed at the Lα. Oily streaks pattern exhibits the biggest hysteresis loop. Taylor and Francis Group 2002 Article PeerReviewed Ismail, Zahariah and Kassim, Anuar and Suhaimi, Hamdan and Ahmad, Salmiah (2002) Phase behavior and rheology of mixed nonionic sugar-based surfactants. Journal of Dispersion Science and Technology, 23 (6). pp. 769-776. ISSN 0193-2691; eISSN: 0193-2691 https://www.tandfonline.com/doi/abs/10.1081/DIS-120015974 10.1081/DIS-120015974
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
description The rheological properties of 40/60, 30/70, and 20/80 by weight ratio of methyl glucose sesquistearate (glucate SS) and PEG-20 methyl glucose sesquistearate (glucamate SSE-20) at 1-phase (Lα) and 2-phase (L1 + Lα) region were studied. These regions are fully developed lamellar liquid crystal (Lα) ranging from 29-31% water, lamella liquid crystal, and isotropic matrix which is closed Lα region (L1 + Lα) ranging from 16-19% water, and lamella liquid crystal in which birefringence is not prominent and isotropic matrix (L1 + Lα)′ ranging from 34-44% water. The viscosity, yield value and thixotropy behavior were studied at 80°C using a Brookfield viscometer. A pseudoplastic behavior exhibits at all the phases for mixed surfactants. The viscosity of mixed surfactants indicated as fall in the following order Lα> (L1 + Lα)′ > (L1 + Lα). The yield values of 40/60 and 20/80 exhibit the same ranking as the viscosity but not for 30/70. The highest plastic viscosity was observed in Lα region. The consistency index or viscosity index increased at Lα and it decreased in the flow index (flow index to describe the flow-curve, i.e., Newtonian, dilatant, pseudoplastic or plastic). The thixotropy behavior in that required a longer time to recover its structure of mixed surfactants showed at the Lα. Oily streaks pattern exhibits the biggest hysteresis loop.
format Article
author Ismail, Zahariah
Kassim, Anuar
Suhaimi, Hamdan
Ahmad, Salmiah
spellingShingle Ismail, Zahariah
Kassim, Anuar
Suhaimi, Hamdan
Ahmad, Salmiah
Phase behavior and rheology of mixed nonionic sugar-based surfactants
author_facet Ismail, Zahariah
Kassim, Anuar
Suhaimi, Hamdan
Ahmad, Salmiah
author_sort Ismail, Zahariah
title Phase behavior and rheology of mixed nonionic sugar-based surfactants
title_short Phase behavior and rheology of mixed nonionic sugar-based surfactants
title_full Phase behavior and rheology of mixed nonionic sugar-based surfactants
title_fullStr Phase behavior and rheology of mixed nonionic sugar-based surfactants
title_full_unstemmed Phase behavior and rheology of mixed nonionic sugar-based surfactants
title_sort phase behavior and rheology of mixed nonionic sugar-based surfactants
publisher Taylor and Francis Group
publishDate 2002
url http://psasir.upm.edu.my/id/eprint/115379/
https://www.tandfonline.com/doi/abs/10.1081/DIS-120015974
_version_ 1825810741199896576
score 13.244413

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