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Paper Information

Journal:   IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN)   FEBRUARY-MARCH 2012 , Volume 24 , Number 6 (ISSUE NUMBER 116); Page(s) 446 To 453.
 
Paper: 

MESOPOROUS SILICA FORMATION BY BLOCK COPOLYMERS AND CETYLTRIMETHYLAMMONIUM BROMIDE AS STRUCTURE CONTROL AGENT

 
 
Author(s):  SEMSARZADEH MOHAMAD ALI*, AZADEH MAEDEH
 
* POLYMER ENGINEERING GROUP, FACULTY OF CHEMICAL ENGINEERING, TARBIAT MODARES UNIVERSITY, TEHRAN, IRAN
 
Abstract: 

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 PPO-PEGPPO 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 cetyltrimethylammonium 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 specific 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 confirmed the mesoporous structure and regularity of these synthesized materials. Finally a mechanism is proposed for the formation of these structures

 
Keyword(s): NANO SILICA STRUCTURE, BLOCK COPOLYMER, TEMPLATE, CATALYST SUPPORT, MESOPOROUS
 
References: 
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