Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5022112 | Composites Science and Technology | 2017 | 5 Pages |
Abstract
Aerogels with oriented sheets show better thermal insulation properties. However, it is difficult to prepare bulk oriented aerogels. In this paper, we prepared this kind of aerogels by using aligned fibers as the wall of galleries. This simple method makes the N-doped graphene sheets align along the in-plane orientation during impregnating. The as-prepared aerogel composites not only show much lower through-plane thermal conductivity (26.6-29.8 mW mâ1 Kâ1) compared to their in-plane thermal conductivity (44.9-55.1 mW mâ1 Kâ1), but also exhibit high tensile strength (higher than 3 MPa). After being heat treated at 300 °C, the through-plane thermal conductivity (23.3 mW mâ1 Kâ1) is even lower than the thermal conductivity of pure aerogels. These properties significantly contribute to their applications in thermal insulation. Besides, the simple method is also useful in preparing other materials with oriented sheets and high strength.
Related Topics
Physical Sciences and Engineering
Engineering
Engineering (General)
Authors
Chenwu Yue, Jian Feng, Junzong Feng, Yonggang Jiang,