Research Papers: Micro/Nanoscale Heat Transfer

Enhanced Specific Heat of Sodium Acetate Trihydrate by In-Situ Nanostructure Synthesis

[+] Author and Article Information
Amirhossein Mostafavi, Sumeet Changla, Aditya Pinto

Mechanical and Aerospace Engineering,
University of Texas at Arlington,
Arlington, TX 76019

Shunkei Suzuki, Shigetoshi Ipposhi

Advanced Technology R&D Center,
Mitsubishi Electric Corporation,
Amagasaki City 661-8661, Hyogo, Japan

Donghyun Shin

School of Engineering and Technology,
Central Michigan University,
Mt Pleasant, MI 48859
e-mail: shin1d@cmich.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received September 26, 2017; final manuscript received August 8, 2018; published online October 24, 2018. Assoc. Editor: Thomas Beechem.

J. Heat Transfer 141(1), 012403 (Oct 24, 2018) (5 pages) Paper No: HT-17-1572; doi: 10.1115/1.4041241 History: Received September 26, 2017; Revised August 08, 2018

Recent studies have shown that doping nanoparticles (NPs) into a molten salt eutectic can induce salt molecules to form a stelliform nanostructure that can enhance the effective heat capacity of the mixture. This phenomenon can result from a unique characteristic of a eutectic molten salt system, which can self-form a nanostructure on a nanoscale solid surface. Hence, such an enhancement was only observed in a molten salt eutectic. Similarly, a stelliform nanostructure can be artificially synthesized and dispersed in other liquids. Mixing polar-ended molecules with a NP in a medium can induce the polar-ended molecules ionically bonded to a NP to form a stelliform nanostructure. Hence, this may enhance the effective heat capacity of the mixture. In this study, we disperse various NPs and polar-ended materials into a sodium acetate trihydrate (SAT) at different ratios to explore the effect of NP type and concentration as well as polar-ended materials and their concentrations on the resultant heat capacity of SAT. The result shows that the specific heat capacity was the highest with silica NP at 1% concentration of weight and polar-ended material at 4% concentration.

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Grahic Jump Location
Fig. 1

(a) A pure molten salt before dispersing NPs, (b) a stelliform nanostructure formed in a molten salt surrounding a NP, and (c) a schematic of the proposed in situ formation of stelliform structure by mixing a NP and polyethylene-block-polys (PBPs). Reprinted under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/) [34].

Grahic Jump Location
Fig. 2

A photon correlation spectroscopy shows that the sizes of four different NPs ((a) SiO2, (b) Al2O3, (c) MgO, and (d) TiO2) are fixed at 10 nm

Grahic Jump Location
Fig. 3

Heat capacity measurements of SAT and PEG with SiO2 NPs, Al2O3 NPs, MgO NPs, and TiO2 NPs

Grahic Jump Location
Fig. 4

Heat capacity measurements of SAT and SiO2 NPs with three different PEGs: short-chained (Mn 920), medium-chained (Mn 1440), and long-chained (Mn 2250)

Grahic Jump Location
Fig. 5

Heat capacity measurements of SAT and PEG with SiO2 NPs at different concentrations from 0.5%, 1.0%, 2.0%, 3.0%, and 4.0% by weight

Grahic Jump Location
Fig. 6

Heat capacity measurements of SAT and SiO2 NPs with PEG at different concentrations from 1%, 2%, 3%, 4%, 5%, and 6% by weight



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