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<p>The reversible intrusion and extrusion of non-wetting liquids into a porous matrix create the basis for a diverse group of energy applications such as molecular springs, shock absorbers, and nano-bumpers. These processes are mainly accompanied by heat exchange that has to be improved for efficient thermal and mechanical energy storage. In this paper, heterogeneous lyophobic systems (HLSs) have been created by mixing the&#xa0;highly porous zeolite imidazole framework (ZIF-8) with a phase change material (PCM) of sodium acetate trihydrate to enhance the&#xa0;energetic features of the system. The non-wetting behavior of the&#xa0;used PCM was confirmed by contact angle measurements. A scanning transitiometer was used for simultaneous measurements of the mechanical and thermal effects of three sodium acetate solutions (mass fraction of 0.203, 0.304 and 0.362) during the intrusion and extrusion process at 298.15&#xa0;K and the sodium acetate trihydrate melt at 353.15&#xa0;K. The results show that the higher the mass fraction of the sodium acetate solutions, the greater the intrusion pressure and heat effect. For the recorded heat values, this increase is more prominent when the salt solution approaches its saturation point and becomes ~ 2.6 times higher than previously obtained&#xa0;results with distilled water. The results indicated here provide a promising way to improve thermal energy storage for possible future engineering applications.</p>

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Stored and restored energetics of sodium acetate solutions and ZIF-8 system driven by pressure

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月29日

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  • Emre Arkan,
  • Lukasz Scheller,
  • Alexander Rowland Lowe,
  • Mirosław Chorążewski

摘要

The reversible intrusion and extrusion of non-wetting liquids into a porous matrix create the basis for a diverse group of energy applications such as molecular springs, shock absorbers, and nano-bumpers. These processes are mainly accompanied by heat exchange that has to be improved for efficient thermal and mechanical energy storage. In this paper, heterogeneous lyophobic systems (HLSs) have been created by mixing the highly porous zeolite imidazole framework (ZIF-8) with a phase change material (PCM) of sodium acetate trihydrate to enhance the energetic features of the system. The non-wetting behavior of the used PCM was confirmed by contact angle measurements. A scanning transitiometer was used for simultaneous measurements of the mechanical and thermal effects of three sodium acetate solutions (mass fraction of 0.203, 0.304 and 0.362) during the intrusion and extrusion process at 298.15 K and the sodium acetate trihydrate melt at 353.15 K. The results show that the higher the mass fraction of the sodium acetate solutions, the greater the intrusion pressure and heat effect. For the recorded heat values, this increase is more prominent when the salt solution approaches its saturation point and becomes ~ 2.6 times higher than previously obtained results with distilled water. The results indicated here provide a promising way to improve thermal energy storage for possible future engineering applications.