Facile synthesis and thermal performances of stearic acid/titania core/shell nanocapsules by sol-gel method

Latibari, S.T. and Mehrali, M. and Mahlia, T.M.I. and Afifi, A.B.M. and Akhiani, A.R. and Metselaar, H.S.C. (2015) Facile synthesis and thermal performances of stearic acid/titania core/shell nanocapsules by sol-gel method. Energy, 85. pp. 635-644. ISSN 0360-5442, DOI https://doi.org/10.1016/j.energy.2015.04.008.

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In order to improve the thermal properties of PCMs (phase change materials), in this study, a new series of NEPCMs (nanoencapsulated phase change materials) were synthesized using a sol-gel method with SA (stearic acid) as the core and TiO2 (titania) as the shell material. The effects of the weight ratios of the SA/titania precursor TTIP (titanium tetraisopropoxide) on the morphology, thermal performance and thermal conductivity of the prepared nanocapsules are discussed. The experimental results indicate that the SA was encapsulated in spheres with minimum and maximum diameters of 583.4 and 946.4 nm, at encapsulation ratios between 30.36 and 64.76. The results indicated that there was no chemical interaction between the core and shell materials, SA and TiO2, which were compatible with each other under controlled synthesis conditions of pH 10. The NEPCMs with high mass ratios of SA/TTIP exhibited enhanced phase change properties and higher encapsulation efficiencies but lower thermal conductivities than NEPCMs with low mass ratios. Good thermal reliability and chemical stability of the NEPCMs were obtained by cycling the material through 2500 melting/solidifying cycles. In conclusion, the outstanding thermal stability and reliability of the prepared nanocapsules make these materials appropriate phase change materials for thermal energy storage applications. (C) 2015 Elsevier Ltd. All rights reserved.

Item Type: Article
Funders: Ministry of High Education (MOHE) of Malaysia UM.C/HIR/MOHENG/21-(D000021-16001), University of Malaya UMRG RP021-2012A , Bright Sparks unit (University of Malaya)
Additional Information: ISI Document Delivery No.: CK0IV Times Cited: 0 Cited Reference Count: 42 Cited References: Borreguero AM, 2011, CHEM ENG J, V166, P384, DOI 10.1016/j.cej.2010.10.055 Can L, 2014, SOL ENERG MAT SOL C, V123, P183 Cao L, 2014, ENERG BUILDINGS, V72, P31, DOI 10.1016/j.enbuild.2013.12.028 Esen M, 2000, SOL ENERGY, V69, P15, DOI 10.1016/S0038-092X(00)00015-3 Esen M, 1998, SOL ENERGY, V62, P19, DOI 10.1016/S0038-092X(97)00104-7 Esen M, 1996, ENERG CONVERS MANAGE, V37, P1775, DOI 10.1016/0196-8904(96)00035-0 Fang GY, 2009, CHEM ENG J, V153, P217, DOI 10.1016/j.cej.2009.06.019 He QB, 2012, ENERG CONVERS MANAGE, V64, P199, DOI 10.1016/j.enconman.2012.04.010 Jamekhorshid A, 2014, RENEW SUST ENERG REV, V31, P531, DOI 10.1016/j.rser.2013.12.033 Konuklu Y, 2014, SOL ENERG MAT SOL C, V120, P536, DOI 10.1016/j.solmat.2013.09.035 Latibari ST, 2013, ENERGY, V61, P664, DOI 10.1016/j.energy.2013.09.012 Li BX, 2013, ACS SUSTAIN CHEM ENG, V1, P374, DOI 10.1021/sc300082m Li W, 2012, ENERGY, V38, P249, DOI 10.1016/j.energy.2011.12.005 Ling TC, 2013, CONSTR BUILD MATER, V46, P55, DOI 10.1016/j.conbuildmat.2013.04.031 Mehrali M, 2014, APPL ENERG, V135, P339, DOI 10.1016/j.apenergy.2014.08.100 Mehrali M, 2013, APPL THERM ENG, V61, P633, DOI 10.1016/j.applthermaleng.2013.08.035 Mehrali M, 2014, ENERG CONVERS MANAGE, V88, P206, DOI 10.1016/j.enconman.2014.08.014 Pan L, 2012, SOL ENERG MAT SOL C, V98, P66, DOI 10.1016/j.solmat.2011.09.020 Pielichowska K, 2014, PROG MATER SCI, V65, P67, DOI 10.1016/j.pmatsci.2014.03.005 Qiu XL, 2012, ENERGY, V46, P188, DOI 10.1016/j.energy.2012.08.037 Salaun F, 2011, J MEMBRANE SCI, V370, P23, DOI 10.1016/j.memsci.2010.11.033 Salunkhe PB, 2012, RENEW SUST ENERG REV, V16, P5603, DOI 10.1016/j.rser.2012.05.037 Sanchez-Silva L, 2010, CHEM ENG J, V157, P216, DOI 10.1016/j.cej.2009.12.013 Sari A, 2009, MATER LETT, V63, P1213, DOI 10.1016/j.matlet.2009.02.045 Song QW, 2007, POLYMER, V48, P3317, DOI 10.1016/j.polymer.2007.03.045 Song SK, 2014, APPL THERM ENG, V70, P546, DOI 10.1016/j.applthermaleng.2014.05.067 Su JF, 2012, ENERG CONVERS MANAGE, V55, P101, DOI 10.1016/j.enconman.2011.10.015 Su JF, 2006, J APPL POLYM SCI, V102, P4996, DOI 10.1002/app.25001 Latibari ST, 2015, ENERG FUEL, V29, P1010, DOI 10.1021/ef502840f Tahan Latibari S, 2014, SCI WORLD J, V2014, P5 Tang BT, 2014, SOL ENERG MAT SOL C, V123, P7, DOI 10.1016/j.solmat.2013.12.022 Teixeira MI, 2004, MAT SCI ENG C-BIO S, V24, P653, DOI 10.1016/j.msec.2004.08.008 Tumirah K, 2014, ENERGY, V66, P881, DOI 10.1016/j.energy.2014.01.033 Wang Y, 2014, SOL ENERG MAT SOL C, V120, P481, DOI 10.1016/j.solmat.2013.09.028 Weck PF, 2014, J PHYS CHEM C, V118, P4618, DOI 10.1021/jp411461m Yu SY, 2014, APPL ENERG, V114, P632, DOI 10.1016/j.apenergy.2013.10.029 Zhang HZ, 2011, COLLOID SURFACE A, V389, P104, DOI 10.1016/j.colsurfa.2011.08.043 Zhang HZ, 2010, J COLLOID INTERF SCI, V343, P246, DOI 10.1016/j.jcis.2009.11.036 Zhang L, 2012, ENERGY, V39, P294, DOI 10.1016/j.energy.2012.01.011 Zhang T, 2012, ENERG CONVERS MANAGE, V64, P1, DOI 10.1016/j.enconman.2012.04.011 Zhang Y, 2015, SOL ENERG MAT SOL C, V133, P56, DOI 10.1016/j.solmat.2014.10.035 Zhang YL, 2011, SOL ENERG MAT SOL C, V95, P2726, DOI 10.1016/j.solmat.2011.02.015 Latibari, Sara Tahan Mehrali, Mohammad Mehrali, Mehdi Afifi, Amalina Binti Muhammad Mahlia, Teuku Meurah Indra Akhiani, Amir Reza Metselaar, Hendrik Simon Cornelis Mehrali, Mehdi/G-6395-2011; Engineering, Faculty /I-7935-2015 Mehrali, Mehdi/0000-0002-5084-1823; Engineering, Faculty /0000-0002-4848-7052 Ministry of High Education (MOHE) of Malaysia UM.C/HIR/MOHENG/21-(D000021-16001); University of Malaya UMRG RP021-2012A; Bright Sparks unit (University of Malaya) Financial support for this study was provided by the Ministry of High Education (MOHE) of Malaysia under Grant No. UM.C/HIR/MOHENG/21-(D000021-16001) "Phase Change Materials (PCM) for Energy Storage System" and the University of Malaya under Research Grant No. UMRG RP021-2012A. The author thanks the Bright Sparks unit (University of Malaya) for its additional financial support. 0 PERGAMON-ELSEVIER SCIENCE LTD OXFORD ENERGY
Uncontrolled Keywords: phase change material (pcm), nanoencapsulation, stearic acid, titanium dioxide, sol-gel method, phase-change materials, energy-storage, n-octadecane, acid, fabrication, composite, shell, microencapsulation, microcapsules, conductivity,
Subjects: T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 09 Mar 2016 02:42
Last Modified: 09 Mar 2016 02:42
URI: http://eprints.um.edu.my/id/eprint/15733

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