Effect of Ultrasonication Duration on Colloidal Structure and Viscosity of Alumina–Water Nanofluid

Nanofluids are promising fluids for heat-transfer applications. Low stability and high viscosity are two important drawbacks for practical applications of nanofluids. The aggregation and sedimentation of nanoparticles are related to the colloidal structure of nanofluids, which directly affects the s...

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Main Authors:	Mahbubul, I.M., Chong, T.H., Khaleduzzaman, S.S., Shahrul, I.M., Saidur, R., Long, B.D., Amalina, M.A.
Format:	Article
Published:	American Chemical Society 2014
Subjects:	TA Engineering (General). Civil engineering (General) TJ Mechanical engineering and machinery
Online Access:	http://pubs.acs.org/doi/abs/10.1021/ie500705j http://pubs.acs.org/doi/abs/10.1021/ie500705j

id	um-11831
recordtype	eprints
spelling	um-118312015-01-10T15:04:02Z Effect of Ultrasonication Duration on Colloidal Structure and Viscosity of Alumina–Water Nanofluid Mahbubul, I.M. Chong, T.H. Khaleduzzaman, S.S. Shahrul, I.M. Saidur, R. Long, B.D. Amalina, M.A. TA Engineering (General). Civil engineering (General) TJ Mechanical engineering and machinery Nanofluids are promising fluids for heat-transfer applications. Low stability and high viscosity are two important drawbacks for practical applications of nanofluids. The aggregation and sedimentation of nanoparticles are related to the colloidal structure of nanofluids, which directly affects the stability and viscosity. An ultrasonic homogenizer can break the aggregation of particles. The aim of this work was to study the effect of the duration of ultrasonic treatment on colloidal structure, including the stability and temperature-dependent viscosity of a nanofluid. Specifically, a 0.5 vol % Al2O3–water nanofluid was prepared using an ultrasonic homogenizer for various durations from 0 to 180 min. The microstructure, colloid and particle sizes, precipitation, and zeta (ζ) potential were analyzed to investigate the aggregation and sedimentation of the nanofluid. The viscosities of nanofluids subjected to ultrasonic treatment for different durations were also measured at different temperatures from 15 to 45 °C. Better particle dispersion, lower particle sizes, smaller colloid sizes, less precipitation, and higher ζ potentials were observed with increasing sonication time. The viscosity of Al2O3–water nanofluid was found to increase with the sonication time up to 60 min and then subsequently decreased. In addition, the viscosity decreased with increasing temperature. The research concluded that more stabler and lower-viscosity nanofluids can be obtained by applying ultrasonic treatment for durations of 90 min or longer. American Chemical Society 2014-03-30 Article PeerReviewed http://pubs.acs.org/doi/abs/10.1021/ie500705j Mahbubul, I.M.; Chong, T.H.; Khaleduzzaman, S.S.; Shahrul, I.M.; Saidur, R.; Long, B.D.; Amalina, M.A. (2014) Effect of Ultrasonication Duration on Colloidal Structure and Viscosity of Alumina–Water Nanofluid. Industrial and Engineering Chemistry Research <http://eprints.um.edu.my/view/publication/Industrial_and_Engineering_Chemistry_Research.html>, 53 (16). pp. 6677-6684. ISSN 0888-5885 http://eprints.um.edu.my/11831/
repository_type	Digital Repository
institution_category	Local University
institution	University Malaya
building	UM Research Repository
collection	Online Access
topic	TA Engineering (General). Civil engineering (General) TJ Mechanical engineering and machinery
spellingShingle	TA Engineering (General). Civil engineering (General) TJ Mechanical engineering and machinery Mahbubul, I.M. Chong, T.H. Khaleduzzaman, S.S. Shahrul, I.M. Saidur, R. Long, B.D. Amalina, M.A. Effect of Ultrasonication Duration on Colloidal Structure and Viscosity of Alumina–Water Nanofluid
description	Nanofluids are promising fluids for heat-transfer applications. Low stability and high viscosity are two important drawbacks for practical applications of nanofluids. The aggregation and sedimentation of nanoparticles are related to the colloidal structure of nanofluids, which directly affects the stability and viscosity. An ultrasonic homogenizer can break the aggregation of particles. The aim of this work was to study the effect of the duration of ultrasonic treatment on colloidal structure, including the stability and temperature-dependent viscosity of a nanofluid. Specifically, a 0.5 vol % Al2O3–water nanofluid was prepared using an ultrasonic homogenizer for various durations from 0 to 180 min. The microstructure, colloid and particle sizes, precipitation, and zeta (ζ) potential were analyzed to investigate the aggregation and sedimentation of the nanofluid. The viscosities of nanofluids subjected to ultrasonic treatment for different durations were also measured at different temperatures from 15 to 45 °C. Better particle dispersion, lower particle sizes, smaller colloid sizes, less precipitation, and higher ζ potentials were observed with increasing sonication time. The viscosity of Al2O3–water nanofluid was found to increase with the sonication time up to 60 min and then subsequently decreased. In addition, the viscosity decreased with increasing temperature. The research concluded that more stabler and lower-viscosity nanofluids can be obtained by applying ultrasonic treatment for durations of 90 min or longer.
format	Article
author	Mahbubul, I.M. Chong, T.H. Khaleduzzaman, S.S. Shahrul, I.M. Saidur, R. Long, B.D. Amalina, M.A.
author_facet	Mahbubul, I.M. Chong, T.H. Khaleduzzaman, S.S. Shahrul, I.M. Saidur, R. Long, B.D. Amalina, M.A.
author_sort	Mahbubul, I.M.
title	Effect of Ultrasonication Duration on Colloidal Structure and Viscosity of Alumina–Water Nanofluid
title_short	Effect of Ultrasonication Duration on Colloidal Structure and Viscosity of Alumina–Water Nanofluid
title_full	Effect of Ultrasonication Duration on Colloidal Structure and Viscosity of Alumina–Water Nanofluid
title_fullStr	Effect of Ultrasonication Duration on Colloidal Structure and Viscosity of Alumina–Water Nanofluid
title_full_unstemmed	Effect of Ultrasonication Duration on Colloidal Structure and Viscosity of Alumina–Water Nanofluid
title_sort	effect of ultrasonication duration on colloidal structure and viscosity of alumina–water nanofluid
publisher	American Chemical Society
publishDate	2014
url	http://pubs.acs.org/doi/abs/10.1021/ie500705j http://pubs.acs.org/doi/abs/10.1021/ie500705j
first_indexed	2018-09-06T06:01:53Z
last_indexed	2018-09-06T06:01:53Z
_version_	1610836830639357952

Effect of Ultrasonication Duration on Colloidal Structure and Viscosity of Alumina–Water Nanofluid

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