甘油镓相变材料乳液(PCMEs)具有优越的潜热容量和导热系数†

IF 4.7 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Chae Young Park, Suji Kim, Chimin Song, Jieun Kim and Joohyung Lee
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引用次数: 0

摘要

在这项研究中,我们展示了一种具有高导热性和潜热容的相变材料乳液(PCME),它是通过在甘油中乳化Ga作为可流动的、电绝缘的液体基质而生产的。采用聚乙烯吡咯烷酮(PVP)作为乳化剂,利用PVP对Ga的强结合亲和力和增加的基质粘度,实现了高Ga负载(50-80 vol%)和稳定的分散。甘油中Ga乳液保持了接近本体Ga的固-液相变温度,在30°C左右熔化,在- 30°C和- 40°C之间结晶,而不像以前的纳米分散体表现出明显的相变温度降低。与传统的有机PCMs乳剂相比,这些PCMEs的热性能显著增强,在80 vol% Ga负载下,其导热系数高达4.85 W m−1 K−1,潜热容高达241.52-262.91 J cm−3。尽管高镓负载,乳液保持电绝缘。此外,这些乳剂表现出粘弹性,这使它们具有高沉降稳定性和结构完整性,同时使它们能够在剪切下进行流体处理。这些Ga-in-glycerol乳剂具有高导热性、大量的潜热容量、电绝缘性和优异的流变加工性,这一独特的组合证明了它们在先进的热管理和能量存储应用方面的潜力,包括电子冷却和可再生能源系统。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Gallium-in-glycerol phase change material emulsions (PCMEs) with superior latent heat capacity and thermal conductivity†

Gallium-in-glycerol phase change material emulsions (PCMEs) with superior latent heat capacity and thermal conductivity†

In this study, we demonstrate a phase change material emulsion (PCME) with high thermal conductivity and latent heat capacity, produced by emulsifying Ga in glycerol as a flowable, electrically insulating liquid matrix. Polyvinylpyrrolidone (PVP) was employed as an emulsifier to achieve high Ga loadings (50–80 vol%) with stable dispersion, leveraging the strong binding affinity of PVP to Ga and the increased matrix viscosity. The Ga-in-glycerol emulsions retained solid–liquid phase transition temperatures near those of bulk Ga, melting at approximately 30 °C and crystallizing between −30 °C and −40 °C, unlike previous nano-sized dispersions that exhibited substantial depression of the phase transition temperatures. These PCMEs displayed significantly enhanced thermal properties compared to conventional emulsions with organic PCMs, with thermal conductivities reaching up to 4.85 W m−1 K−1 and latent heat capacities up to 241.52–262.91 J cm−3 at 80 vol% Ga loading. Despite the high Ga loading, the emulsions maintained electrical insulation. Additionally, these emulsions exhibited viscoelasticity, which confers them with high sedimentation stability and structure integrity while enabling their fluidic processing under shear. The unique combination of high thermal conductivity, substantial latent heat capacity, electrical insulation, and excellent rheological processability of these Ga-in-glycerol emulsions demonstrates their potential for advanced thermal management and energy storage applications, including electronics cooling and renewable energy systems.

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来源期刊
Materials Advances
Materials Advances MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
7.60
自引率
2.00%
发文量
665
审稿时长
5 weeks
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