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Research Papers: Micro/Nanoscale Heat Transfer

Improving the Supercooling Degree of TiO2 Suspensions by Coupling With Zirconium Phosphate Nanoplatelets

[+] Author and Article Information
Xiao Yuan

Guangdong Provincial Key Laboratory on
Functional Soft Condensed Matter,
School of Materials and Energy,
Guangdong University of Technology,
Guangzhou 510006, China
e-mail: yx910214@163.com

Songping Mo

Guangdong Provincial Key Laboratory on
Functional Soft Condensed Matter,
School of Materials and Energy,
Guangdong University of Technology,
Guangzhou 510006, China
e-mail: mosp@ustc.edu

Ying Chen

Guangdong Provincial Key Laboratory on
Functional Soft Condensed Matter,
School of Materials and Energy,
Guangdong University of Technology,
Guangzhou 510006, China
e-mail: chenying@gdut.edu.cn

Lisi Jia

Guangdong Provincial Key Laboratory on
Functional Soft Condensed Matter,
School of Materials and Energy,
Guangdong University of Technology,
Guangzhou 510006, China
e-mail: jialisi@gdut.edu.cn

Tao Yin

Guangdong Provincial Key Laboratory on
Functional Soft Condensed Matter,
School of Materials and Energy,
Guangdong University of Technology,
Guangzhou 510006, China
e-mail: yintao@gdut.edu.cn

Zhi Yang

Guangdong Provincial Key Laboratory on
Functional Soft Condensed Matter,
School of Materials and Energy,
Guangdong University of Technology,
Guangzhou 510006, China
e-mail: yangzhi0610@163.com

Zhengdong Cheng

Artie McFerrin Department of
Chemical Engineering,
Texas A&M University,
College Station, TX 77840
e-mail: zcheng@mail.che.tamu.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 26, 2017; final manuscript received October 14, 2017; published online April 6, 2018. Assoc. Editor: Thomas Beechem.

J. Heat Transfer 140(7), 072403 (Apr 06, 2018) (5 pages) Paper No: HT-17-1230; doi: 10.1115/1.4038558 History: Received April 26, 2017; Revised October 14, 2017

Phase-change materials (PCM) with low supercooling degree (SD) are important in cold thermal energy storage (CTES) applications. The SD of nanosuspension PCM usually decreases with increasing nanoparticle concentration. However, the performance variation of nanosuspension PCM at high concentrations has been rarely studied, though it is important because nanoparticles tend to aggregate. In this paper, the SD and dispersion stability of nanosuspensions of TiO2, zirconium phosphate (ZrP), and TiO2 coupled with zirconium phosphate (TiO2-ZrP) were investigated at nanoparticle concentrations up to 5.0 wt %. Results show that the SD of TiO2 suspension did not remarkably varied with mass concentrations above 2.0 wt %. In contrast, the SD of TiO2-ZrP and ZrP were low and continuously decreased with increasing mass concentration of nanoparticles. The dispersion stability of TiO2-ZrP suspension improved compared with that of TiO2 suspension. Hence, TiO2-ZrP suspension provided more nucleation sites than TiO2 suspension to induce heterogeneous in water.

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Figures

Grahic Jump Location
Fig. 3

Particle size distribution of the TiO2 nanoparticles

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Fig. 2

Schematic for obtaining the cooling curves of nanosuspensions

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Fig. 1

(a) SEM image of ZrP, (b) TEM image of TiO2, (c) SEM image of TiO2-ZrP, (d) TEM image of ZrP, and (e) TEM image of TiO2-ZrP

Grahic Jump Location
Fig. 4

Transmission and backscattering curves of (a) 5.0% TiO2 and (b) 5.0% exfoliated TiO2-ZrP

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Fig. 5

Cooling curves of (a) TiO2, (b) TiO2-ZrP, and (c) ZrP suspensions

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Fig. 6

Supercooling degree ratio values

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Fig. 7

Nucleation temperature with mass fraction of nanoparticles

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