| Bamboo Leaf Aerogel Opacified with Activated Carbon |
Kien-Woh Kow,a,* Rozita Yusoff,b A. R. Abdul Azizb and E. C. Abdullahc
pages : 175-180
DOI : 10.1080/0371750X.2016.1197047 |
| Abstract |
| Opacification of silica aerogel to reduce its thermal conductivity is normally done by
using carbon. The motivation of this work is to use bamboo leaf as a single source to
synthesize water glass and activated carbon. These precursors were then used to
synthesize carbon-opacified silica aerogel (COSA). Because bamboo leaf is an
agriculture waste, it provides a low-cost source to synthesize COSA. The properties
of COSA were compared with other aerogels, including aerogel opacified with carbon
black and synthesized from alkoxide. The results indicate that COSA have a bulk
density of 0.069±0.0014 g.cm–3, a porosity of 97.9%, a BET specific surface area of
330.5±3.7 m2.g–1, a total pore volume of 1.38±0.07cm3.g–1 and a thermal conductivity
of 0.0311±0.009 W.m–1.K–1. The TGA results show that COSA is thermally stable up to
495oC and is therefore suitable for use in thermal insulation at high temperature.
[Keywords: Silica aerogel, Carbon opacification, Activated carbon, Thermal
conductivity, Sol-gel method] |
| Full text : Subscribe to Download Full Text |
| [Go Back] |
|
