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Beyond physical segregation: the overlooked role of hydrolysis in salt hydrate phase-change materials.
Number: 0008
Author(s) : TONIOLO D., EIHOLZER J., MARTINEZ-GARCIA J., RAVOTTI R.
Summary
Salt hydrates are widely studied as phase-change materials (PCMs) for medium-temperature thermal energy storage and cooling systems; however, their performance is limited by segregation phenomena that reduce cycling stability. Segregation has traditionally been attributed to incongruent melting, density-driven phase separation, and redistribution of crystallisation water during melting–solidification cycles. Here we revisit a known chemical process whose role in PCM degradation has largely been overlooked: hydrolysis-related reactions involving crystallisation water. Using X-ray diffraction (XRD) and differential scanning calorimetry (DSC), we evaluated the stability of selected first-row transition-metals salts for thermal energy storage applications.
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Details
- Original title: Beyond physical segregation: the overlooked role of hydrolysis in salt hydrate phase-change materials.
- Record ID : 30035355
- Languages: English
- Subject: Technology
- Source: 15th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings: Xi'an China, September 16-18, 2026.
- Publication date: 2026/09
- DOI: http://dx.doi.org/10.18462/iir.pcm.2026.0008
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Indexing
- Themes: Two-phase secondary refrigerants (PCMs, ice slurries…)
- Keywords: PCM; Salt (generic); Hydrate; Thermal energy storage; Aluminium; Copper; Cobalt; Chromium; Calcium; Magnesium
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