期刊
JOURNAL OF SUPERCRITICAL FLUIDS
卷 106, 期 -, 页码 57-61出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.supflu.2015.06.021
关键词
Aerogels; Sol-gel process; Shrinkage; Density; Compressive modulus; Thermal conductivity
资金
- Project AeroBau by the State of Northrhine-Westphalia
Aerogels have attracted remarkable attention as porous low-density superinsulating material. However, they are typically brittle and tend to shrink during preparation or work-up preventing their use as a composite material. In that context, we have developed a sol-gel-process towards resorcinol-formaldehyde aerogels that includes a precise pH-adjustment at an early stage of the polymerization. As a result, less brittle analogues of Pekala aerogels were obtained that resemble Pekala gels in many aspects (skeletal density, porosity, thermal properties). However, significant differences were found in terms of inner surface area and compressive modulus, which are smaller for lower pH-values. Since pH-adjustment leads to minimal gel shrinkage, this sol-gel-process may be useful for the development of aerogel composites. (C) 2015 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据