[1] Shen Xuyan, Feng Pan, Zhang Qi, et al. Synthesis and thermal characterization of the C-S-H/paraffin composite phase change material utilizing a discontinuous two-step nucleation method [J]. Journal of Southeast University (English Edition), 2024, 40 (4): 327-335. [doi:10.3969/j.issn.1003-7985.2024.04.001]

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Synthesis and thermal characterization of the C-S-H/paraffin composite phase change material utilizing a discontinuous two-step nucleation method()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

40

Issue:

2024 4

Page:

327-335

Research Field:

Materials Sciences and Engineering

Publishing date:

2024-12-03

Info

Title:

Synthesis and thermal characterization of the C-S-H/paraffin composite phase change material utilizing a discontinuous two-step nucleation method

Author(s):

Shen Xuyan¹;  Feng Pan¹;  2;  Zhang Qi¹

¹School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
²State Key Laboratory of High Performance Civil Engineering Materials, Nanjing 210008, China

Keywords:

two-step nucleation;  C-S-H;  paraffin;  phase change materials;  composite;  building thermal management

PACS:

TU506

DOI:

10.3969/j.issn.1003-7985.2024.04.001

Abstract:

The novel calcium-silicate-hydrate(C-S-H)/paraffin composite phase change materials were synthesized using a discontinuous two-step nucleation method. Initially, the C-S-H precursor is separated and dried, followed by immersion in an aqueous environment to transform it into C-S-H. This two-step nucleation approach results in C-S-H with a specific surface area of 497.2 m²/g, achieved by preventing C-S-H foil overlapping and refining its pore structure. When impregnated with paraffin, the novel C-S-H/paraffin composite exhibits superior thermal properties, such as a higher potential heat value of 148.3 J/g and an encapsulation efficiency of 81.6%, outperforming conventional C-S-H. Moreover, the composite material demonstrates excellent cyclic performance, indicating its potential for building thermal storage compared to other paraffin-based composites. Compared with the conventional method, this simple technology, which only adds conversion and centrifugation steps, does not negatively impact preparation costs, the environment, and resource consumption. This study provides valuable theoretical insights for designing thermal storage concrete materials and advancing building heat management.

References:

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Memo

Memo:

Biographies: Shen Xuyan(1997—), male, Ph.D. candidate; Feng Pan(corresponding author), female, doctor, professor, pan.feng@seu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No. 52122802, 52078126), Jiangsu Provincial Department of Science and Technology Innovation Support Program(No. BK20222004, BZ2022036).
Citation: Shen Xuyan, Feng Pan, Zhang Qi.Synthesis and thermal characterization of the C-S-H/paraffin composite phase change material utilizing a discontinuous two-step nucleation method[J].Journal of Southeast University(English Edition), 2024, 40(4):327-335.DOI:10.3969/j.issn.1003-7985.2024.04.001.

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