Comparative Studies of Grafting and Direct Syntheses of Inorganic−Organic Hybrid Mesoporous Materials

1999 ◽  
Vol 11 (11) ◽  
pp. 3285-3295 ◽  
Author(s):  
Myong H. Lim ◽  
Andreas Stein
Keyword(s):  
Mesoporous Materials ◽  
Comparative Studies ◽  
Organic Hybrid ◽  
Hybrid Mesoporous Materials

Synthesis of Smart Mesoporous Materials

2003 ◽  
Vol 775 ◽  
Author(s):  
G.V.Rama Rao ◽  
Qiang Fu ◽  
Linnea K. Ista ◽  
Huifang Xu ◽  
S. Balamurugan ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Mesoporous Materials ◽  
Fluorescent Dyes ◽  
Thermo Gravimetric Analysis ◽  
Molecular Transport ◽  
Solute Diffusion ◽  
Gravimetric Analysis ◽  
Stimuli Responsive ◽  
Porous Network ◽  
Hybrid Mesoporous Materials

AbstractThis study details development of hybrid mesoporous materials in which molecular transport through mesopores can be precisely controlled and reversibly modulated. Mesoporous silica materials formed by surfactant templating were modified by surface initiated atom transfer radical polymerization of poly(N-isopropyl acrylamide) (PNIPAAm) a stimuli responsive polymer (SRP) within the porous network. Thermo gravimetric analysis and FTIR spectroscopy were used to confirm the presence of PNIPAAm on the silica surface. Nitrogen porosimetry, transmission electron microscopy and X-ray diffraction analyses confirmed that polymerization occurred uniformly within the porous network. Uptake and release of fluorescent dyes from the particles was monitored by spectrofluorimetry and scanning laser confocal microscopy. Results suggest that the presence of PNIPAAm, a SRP, in the porous network can be used to modulate the transport of aqueous solutes. At low temperature, (e.g., room temperature) the PNIPAAm is hydrated and extended and inhibits transport of analytes; at higher temperatures (e.g., 50°C) it is hydrophobic and is collapsed within the pore network, thus allowing solute diffusion into or out of the mesoporous silica. The transition form hydrophilic to hydrophobic state on polymer grafted mesoporous membranes was determined by contact angle measurements. This work has implications for the development of materials for the selective control of transport of molecular solutes in a variety of applications.

ChemInform Abstract: Dendrimer-Silica Hybrid Mesoporous Materials

ChemInform ◽  
2012 ◽  
Vol 43 (22) ◽  
pp. no-no
Author(s):  
Abdelkrim El Kadib ◽  
Nadia Katir ◽  
Mosto Bousmina ◽  
Jean Pierre Majoral
Keyword(s):  
Mesoporous Materials ◽  
Hybrid Mesoporous Materials ◽  
Silica Hybrid

Dendrimer–silica hybrid mesoporous materials

2012 ◽  
Vol 36 (2) ◽  
pp. 241-255 ◽  
Author(s):  
Abdelkrim El Kadib ◽  
Nadia Katir ◽  
Mosto Bousmina ◽  
Jean Pierre Majoral
Keyword(s):  
Mesoporous Materials ◽  
Hybrid Mesoporous Materials ◽  
Silica Hybrid
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