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<p>This study focuses on developing bio-based thermal energy storage microcapsules (MCs) by spray drying. New MCs were successfully prepared using ethyl laurate as the core material (phase change material; PCM), and gelatin as the outer shell. Various physical cross-linkers for the outer shell and spray drying temperatures were tested to improve the stability of MCs and retention of the PCM. It was found that physical cross-linking by tannic acid under acidic to neutral pH conditions was the most effective in strengthening the outer shell and that a spray drying temperature of 120&#xa0;°C was optimal for obtaining well-dried MCs with minimal PCM loss. Higher core/shell ratios resulted in higher encapsulation efficiency, indicating that more PCM could be effectively encapsulated. These MCs showed the improved PCM content and thermal stability, reaching 70.1% PCM content at a core/shell ratio of 5. Heat storage tests for MCs showed significant suppression of temperature change between − 5 and 3&#xa0;°C.</p>

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Preparation of bio-based thermal energy storage microcapsules by spray drying and its property evaluation

  • 期刊论文

  • 发表日期：

    2025年3月21日

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  • Michiya Takatani,
  • Naoki Takaoka,
  • Kyuya Nakagawa,
  • Takashi Kobayashi

摘要

This study focuses on developing bio-based thermal energy storage microcapsules (MCs) by spray drying. New MCs were successfully prepared using ethyl laurate as the core material (phase change material; PCM), and gelatin as the outer shell. Various physical cross-linkers for the outer shell and spray drying temperatures were tested to improve the stability of MCs and retention of the PCM. It was found that physical cross-linking by tannic acid under acidic to neutral pH conditions was the most effective in strengthening the outer shell and that a spray drying temperature of 120 °C was optimal for obtaining well-dried MCs with minimal PCM loss. Higher core/shell ratios resulted in higher encapsulation efficiency, indicating that more PCM could be effectively encapsulated. These MCs showed the improved PCM content and thermal stability, reaching 70.1% PCM content at a core/shell ratio of 5. Heat storage tests for MCs showed significant suppression of temperature change between − 5 and 3 °C.