S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Theses (Master's Degree_화학생물공학부)
Direct synthesis of ordered mesoporous carbons from the carbonization of as-synthesized silicatriblock copolymer nanoaomposites
- Issue Date
- 서울대학교 대학원
- Thesis (master`s)--서울대학교 대학원 :응용화학부,2003.
- In this research, ordered mesoporous carbon materials were synthesized
through a simple direct synthetic method using as-synthesized silica/triblock
copolymer nanocomposites. In a narrow concentration range of triblock
copolymer P123, the template of mesostructured silicates, 2-D hexagonally
ordered mesoporous silica is synthesized. After sulfuric acid treatment on assynthesized
SBA-15/triblockcopolymer nanocomposites in order to polymerize
P123 molecules and carbonization under N2 atmosphere, P123 is converted to
carbon materials in the mesostructured silica. Finally, the ordered mesoporous
carbon, denoted as DC-S15 (direct mesoporous carbon from as-synthesized
SBA-15), is obtained through dissolving of silica materials.
This method is very simple because it excludes some of the steps that had
to be done generally in template synthesis of mesoporous carbon, that is,
extraction or calcinations, and filling of carbon precursors. And all obtained
carbons are originated from only triblock copolymer P123, the template of
silica SBA-15, which has not been known as carbon precursor. Moreover, the
pore structure of this mesoporous carbon is nano-pipe type reminiscent of
CMK-5 obtained from the controlled polymerization of furfuryl alcohol inside
the pores of SBA-15 or obtained through catalytic chemical vapor deposition (CCVD) using SBA-15 as template.
This current synthetic procedure can be extended in order to synthesize
other mesoporous carbons using various triblock copolymer-based
mesostructured systems. Using P103, which has shorter PPO group than P123,
instead of P123 in the synthesis of as-synthesized SBA-15, CMK-3 carbon is
obtained. And the mesocellular carbon foams are prepared using as-synthesized
MCF/P123 nanocomposites. Moreover, it is possible to synthesize DC-S15
carbon materials from the direct carbonization of mesostructured silica/triblock
copolymer nanocomposites by performing the acid catalyzed sol-gel
polymerization using sulfuric acid instead of hydrochloric acid.
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