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Development of mesoporous structures of composite silica particles with various organic functional groups in the presence and absence of ammonia catalyst

Title
Development of mesoporous structures of composite silica particles with various organic functional groups in the presence and absence of ammonia catalyst
Author
구상만
Keywords
Mesoporous structures; Composite silica particles; Multi-layered network; Organosilanes; Selective dissolution; Hierarchical nanostructures
Issue Date
2017-06
Publisher
SPRINGER
Citation
JOURNAL OF NANOPARTICLE RESEARCH, v. 19, no. 6, Article no. 226
Abstract
Development of mesoporous structures of composite silica particles with various organic functional groups was investigated by using a two-step process, consisting of one-pot sol-gel process in the presence and absence of ammonium hydroxide and a selective dissolution process with an ethanol-water mixture. Five different organosilanes, including methyltrimethoxysilane (MTMS), 3-mercaptopropyltrimethoxysilane (MPTMS), phenyltrimethoxysilane (PTMS), vinyltrimethoxysilane (VTMS), and 3-aminopropyltrimethoxysilane (APTMS) were employed. The mesoporous (organically modified silica) ORMOSIL particles were obtained even in the absence of ammonium hydroxide when the reaction mixture contained APTMS. The morphology of the particles, however, were different from those prepared with ammonia catalyst and the same organosilane mixtures, probably because the overall hydrolysis/condensation rates became slower. Co-existence of APTMS and VTMS was essential to preparemesoporous particles from ternary organosilane mixtures. The work presented here demonstrates that organosilica particles with desired functionality and desired mesoporous structures can be obtained by selecting proper types of organosilane monomers and performing a facile and mild process either with or without ammonium hydroxide.
URI
https://link.springer.com/article/10.1007%2Fs11051-017-3928-1http://repository.hanyang.ac.kr/handle/20.500.11754/114396
ISSN
1388-0764; 1572-896X
DOI
10.1007/s11051-017-3928-1
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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