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. 2018 Jul 30;11(8):1315.
doi: 10.3390/ma11081315.

Preparation and Experimental Evaluation of Phase-Change Characteristics in Carbon-Based Suspensions

Tun-Ping Teng  1 , Ting-Chiang Hsiao  2 , Chun-Chi Chung  3
Affiliations

Preparation and Experimental Evaluation of Phase-Change Characteristics in Carbon-Based Suspensions

Tun-Ping Teng et al. Materials (Basel). .

Abstract

In this study, micro/nanocarbon-based materials (MNCBMs) were prepared using the high-pressure combustion method (HPCM) with an isoperibol oxygen bomb calorimeter at different oxygen pressures (0.5⁻3.0 MPa). The prepared MNCBMs were added to water to form carbon-based suspensions (CBSs); sodium dodecyl benzene sulfonate (SDBS) and defoamer were added to the CBSs to enhance their stability. The thermal conductivity, viscosity, density, and contact angle of the CBSs were measured using appropriate instruments to determine their fundamental characteristics. The phase-change characteristics of the CBSs were measured and analyzed using a differential scanning calorimeter (DSC) to evaluate the feasibility of employing them as phase-change materials in ice-storage air-conditioning systems. The results revealed that the maximal change ratios of thermal conductivity, viscosity, density, and contact angle of the samples were -3.15%, 6.25%, 0.23%, and -57.03%, respectively, as compared with the water. The CBS of S5 (oxygen pressure of 2.0 MPa) had the lowest melting temperature and subcooling degree (SD) and the highest freezing temperature in the experiments conducted using the DSC; thus, S5 was determined to be the most suitable CBS for use as a phase-change material of cold energy storage in this study.

Keywords: carbon-based suspensions (CBSs); differential scanning calorimeter (DSC); high-pressure combustion method (HPCM); micro/nanocarbon-based materials (MNCBMs); subcooling degree (SD).

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Installation of the high-pressure combustion method (HPCM) manufacturing system.
Figure 2
Figure 2
PR and combustion heat value (Hcv) of the micro/nanocarbon-based materials (MNCBMs) for HPCM at various oxygen pressures.
Figure 3
Figure 3
Field-emission scanning electron microscope (FESEM) image of the MNCBMs: (a) graphite powder (GP), (b) 0.5 MPa, (c) 1.0 MPa, (d) 1.5 MPa, (e) 2.0 MPa, and (f) 2.5 MPa.
Figure 4
Figure 4
X-ray diffraction (XRD) patterns of the MNCBMs: (a) GP, (b) 0.5 MPa, (c) 1.0 MPa, (d) 1.5 MPa, (e) 2.0 MPa, and (f) 2.5 MPa.
Figure 5
Figure 5
Photograph of the test samples.
Figure 6
Figure 6
Charging and discharging curve of differential scanning calorimeter (DSC) for water.
Figure 7
Figure 7
Changes in solidification temperature (Tcp) and melting temperature (Tdp) for the samples.
Figure 8
Figure 8
Changes in Tds and subcooling degree (SD) for the samples.
Figure 9
Figure 9
Changes in heat for solidification (ΔHs) and melting (ΔHm) for the samples.
See this image and copyright information in PMC

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