Mesoporous Silica Formation by Block Copolymers and Cetyltrimethylammonium Bromide as Structure Control Agent
Block copolymers and cetyltrimethylammonium bromide were used as templates in nano silica structure formation like MCM-41)Mobil Composition of Matter), SBA16 )Santa Barbara Amorphous) and a new compound namely SPB )silicone mesoporous particles, prepared by sol-gel method using PPG-PEG-PPG block co...
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doaj-49fa684b29a44e8aa8c01821c6e430a52020-11-25T00:11:41ZfasIran Polymer and Petrochemical Instituteعلوم و تکنولوژی پلیمر1016-32552008-08832013-01-0124644545310.22063/jipst.2013.609609Mesoporous Silica Formation by Block Copolymers and Cetyltrimethylammonium Bromide as Structure Control AgentMohamad Ali SemsarzadehMaedeh AzadehBlock copolymers and cetyltrimethylammonium bromide were used as templates in nano silica structure formation like MCM-41)Mobil Composition of Matter), SBA16 )Santa Barbara Amorphous) and a new compound namely SPB )silicone mesoporous particles, prepared by sol-gel method using PPG-PEG-PPG block copolymer) to compare the porosity and regularity of the products together. In this work tetraethylorthosilicate )TEOS), as silica source and alcohol as surface modifying agent were used because of having the main advantage, compared to an ionic template such as etyltrimethylammonium bromide, in producing larger pores and thicker walls for holding larger catalytic molecules in their pores or increasing their resistance towards fragmentation. In order to study the copolymer as a template, SPB structure was prepared and compared with SBA16 which was found to have broader pore-size distribution and smaller specifc surface area. Using alcohol in particle production resulted in higher formation rate of micelles with improved morphology. Nitrogen adsorption-desorption, X-ray diffraction and electron scanning microscopy confrmed the mesoporous structure and regularity of these synthesized materials. Finally a mechanism is proposed for the formation of these structures.http://jips.ippi.ac.ir/article_609_5bef171fca3ba44590ddf752927a6167.pdfnano silica structureblock copolymertemplatecatalyst supportmesoporous |
collection |
DOAJ |
language |
fas |
format |
Article |
sources |
DOAJ |
author |
Mohamad Ali Semsarzadeh Maedeh Azadeh |
spellingShingle |
Mohamad Ali Semsarzadeh Maedeh Azadeh Mesoporous Silica Formation by Block Copolymers and Cetyltrimethylammonium Bromide as Structure Control Agent علوم و تکنولوژی پلیمر nano silica structure block copolymer template catalyst support mesoporous |
author_facet |
Mohamad Ali Semsarzadeh Maedeh Azadeh |
author_sort |
Mohamad Ali Semsarzadeh |
title |
Mesoporous Silica Formation by Block Copolymers and Cetyltrimethylammonium Bromide as Structure Control Agent |
title_short |
Mesoporous Silica Formation by Block Copolymers and Cetyltrimethylammonium Bromide as Structure Control Agent |
title_full |
Mesoporous Silica Formation by Block Copolymers and Cetyltrimethylammonium Bromide as Structure Control Agent |
title_fullStr |
Mesoporous Silica Formation by Block Copolymers and Cetyltrimethylammonium Bromide as Structure Control Agent |
title_full_unstemmed |
Mesoporous Silica Formation by Block Copolymers and Cetyltrimethylammonium Bromide as Structure Control Agent |
title_sort |
mesoporous silica formation by block copolymers and cetyltrimethylammonium bromide as structure control agent |
publisher |
Iran Polymer and Petrochemical Institute |
series |
علوم و تکنولوژی پلیمر |
issn |
1016-3255 2008-0883 |
publishDate |
2013-01-01 |
description |
Block copolymers and cetyltrimethylammonium bromide were used as templates in nano silica structure formation like MCM-41)Mobil Composition of Matter), SBA16 )Santa Barbara Amorphous) and a new compound namely SPB )silicone mesoporous particles, prepared by sol-gel method using PPG-PEG-PPG block copolymer) to compare the porosity and regularity of the products together. In this work tetraethylorthosilicate )TEOS), as silica source and alcohol as surface modifying agent were used because of having the main advantage, compared to an ionic template such as etyltrimethylammonium bromide, in producing larger pores and thicker walls for holding larger catalytic molecules in their pores or increasing their resistance towards fragmentation. In order to study the copolymer as a template, SPB structure was prepared and compared with SBA16 which was found to have broader pore-size distribution and smaller specifc surface area. Using alcohol in particle production resulted in higher formation rate of micelles with improved morphology. Nitrogen adsorption-desorption, X-ray diffraction and electron scanning microscopy confrmed the mesoporous structure and regularity of these synthesized materials. Finally a mechanism is proposed for the formation of these structures. |
topic |
nano silica structure block copolymer template catalyst support mesoporous |
url |
http://jips.ippi.ac.ir/article_609_5bef171fca3ba44590ddf752927a6167.pdf |
work_keys_str_mv |
AT mohamadalisemsarzadeh mesoporoussilicaformationbyblockcopolymersandcetyltrimethylammoniumbromideasstructurecontrolagent AT maedehazadeh mesoporoussilicaformationbyblockcopolymersandcetyltrimethylammoniumbromideasstructurecontrolagent |
_version_ |
1716210695056392192 |