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纤维素二酸盐气凝具有较低的干燥收缩率,高效的隔热和优越的机械强度

Sizhao Zhang^1,2,3, Kunming Lu¹, Yangbiao Hu¹

¹Polymer Aerogels Research Center, Jiangxi University of Science and Technology, Nanchang 330013, China.

Gels (Basel, Switzerland)

|March 27, 2024

概括

研究人员开发了纤维素二酸盐气凝 (CDAAs),减少了收缩和增强了机械强度. 这些先进的气凝提供了卓越的绝热,为新材料应用铺平了道路.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
化学工程是化学工程的重要组成部分.

背景情况:

纤维素衍生的气凝由于其丰富性和环保性而具有吸引力.
然而,显著的收缩和低机械强度限制了它们的实际应用.
开发强大且尺寸稳定的纤维素气凝至关重要.

研究的目的:

为了制备具有改进性能的纤维素二酸盐气凝 (CDAAs).
为了解决干燥收缩和纤维素气凝机械软弱的局限性.
为更广泛的应用增强绝热和机械强度.

主要方法:

使用三butanol溶剂交换方法来降低表面张力.
通过超临界干燥制备的纤维素二酸盐气凝 (CDAAs).
气凝结构,密度,导热率和机械强度的特征.

主要成果:

在CDAAs中实现了1.4%的低辐射干燥收缩.
获得了0.069gcm-3.3的低散装密度.
证明了出色的绝热性能,导电率为0.021 W m-1 K-1.1.
报告的机械强度优越,压力应力为0.22 MPa在3%应变和0.27 MPa在5%应变.
观察到一个3D网络结构,孔径以50nm为中心.

结论:

开发的CDAA显著减少了干燥收缩和增强了机械性能.
独特的多孔结构和溶剂交换方法有助于实现卓越的绝热.
这项研究为高性能纤维素衍生的气凝提供了一个有希望的战略.

关键词:

气凝是一种空气凝.纤维素纤维素的使用方法干燥收缩收缩干燥机械强度机械强度机械强度热绝缘热绝缘热绝缘热绝缘

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