Force-driven reversible liquid–gas phase transition mediated by elastic nanosponges
Force-driven reversible liquid–gas phase transition mediated by elastic nanosponges
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DOI：
10.1038/s41467-019-10511-7
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发表时间：
2019-06
影响因子：
16.6
通讯作者：
K. Nomura;H. Nishihara;Masanori Yamamoto;Atsushi Gabe;Masashi Ito;M. Uchimura;Y. Nishina;Hideki Tanaka;M. Miyahara;T. Kyotani
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文献类型：
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作者：
K. Nomura;H. Nishihara;Masanori Yamamoto;Atsushi Gabe;Masashi Ito;M. Uchimura;Y. Nishina;Hideki Tanaka;M. Miyahara;T. Kyotani
纳米多孔材料中的纳米受限空间使异常的物理化学现象成为可能。虽然包括金属-有机骨架在内的大多数纳米多孔材料都是机械硬的，但基于石墨烯的纳米多孔材料具有显著的弹性，并具有纳米棒的行为，使客体分子的力驱动液-气相变成为可能。在这项工作中，我们展示了由纳米颗粒介导的力驱动的液-气相变，这可能适用于高效的热管理。纳米粒子的压缩和自由膨胀分别提供了蒸发时的冷却和凝结时的加热，这与形状记忆金属中力驱动的固-固相变相反。该机制可应用于水和醇等绿色制冷剂，可用潜热至少高达192 kJ kg−1。使用这种纳米颗粒的制冷系统可以通过降低纳米颗粒的杨氏模数来获得高的性能系数。
Nano-confined spaces in nanoporous materials enable anomalous physicochemical phenomena. While most nanoporous materials including metal-organic frameworks are mechanically hard, graphene-based nanoporous materials possess significant elasticity and behave as nanosponges that enable the force-driven liquid–gas phase transition of guest molecules. In this work, we demonstrate force-driven liquid–gas phase transition mediated by nanosponges, which may be suitable in high-efficiency heat management. Compression and free-expansion of the nanosponge afford cooling upon evaporation and heating upon condensation, respectively, which are opposite to the force-driven solid–solid phase transition in shape-memory metals. The present mechanism can be applied to green refrigerants such as H2O and alcohols, and the available latent heat is at least as high as 192 kJ kg−1. Cooling systems using such nanosponges can potentially achieve high coefficients of performance by decreasing the Young’s modulus of the nanosponge.