Synthesis and Catalytic Properties of Hybrid Mesoporous Materials Assembled from Polyhedral and Bridged Silsesquioxane Monomers

2012 ◽  
Vol 18 (28) ◽  
pp. 8659-8672 ◽  
Author(s):  
Urbano Díaz ◽  
Teresa García ◽  
Alexandra Velty ◽  
Avelino Corma
Keyword(s):  
Mesoporous Materials ◽  
Catalytic Properties ◽  
Bridged Silsesquioxane ◽  
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.

Magnetically separable titanium-silicate mesoporous materials with core–shell morphology: synthesis, characterization and catalytic properties

2009 ◽  
Vol 19 (39) ◽  
pp. 7332 ◽  
Author(s):  
Marina V. Barmatova ◽  
Irina D. Ivanchikova ◽  
Oxana A. Kholdeeva ◽  
Alexander N. Shmakov ◽  
Vladimir I. Zaikovskii ◽  
...  
Keyword(s):  
Mesoporous Materials ◽  
Catalytic Properties ◽  
Shell Morphology ◽  
Core Shell ◽  
Titanium Silicate ◽  
Magnetically Separable

Synthesis of hybrid (Ni-Mo)carbides/carbon-coated mesoporous materials and their catalytic properties for hydrocracking of intermediate paraffins (n-C8)

2009 ◽  
Vol 148 (1-2) ◽  
pp. 55-62 ◽  
Author(s):  
A.I. Reyes de la Torre ◽  
J.M. Domínguez ◽  
J.A. Melo-Banda ◽  
C.E. Ramos G. ◽  
G. Sandoval ◽  
...  
Keyword(s):  
Mesoporous Materials ◽  
Catalytic Properties ◽  
Carbon Coated

Stability and catalytic properties of chloroperoxidase immobilized on SBA-16 mesoporous materials

2005 ◽  
Vol 83 (1-3) ◽  
pp. 193-200 ◽  
Author(s):  
Jorge Aburto ◽  
Marcela Ayala ◽  
Ismael Bustos-Jaimes ◽  
Carmina Montiel ◽  
Eduardo Terrés ◽  
...  
Keyword(s):  
Mesoporous Materials ◽  
Catalytic Properties

Modification of the adsorption and catalytic properties of micro- and mesoporous materials by reactions with organometallic complexes

2010 ◽  
Vol 53 (9) ◽  
pp. 1862-1869 ◽  
Author(s):  
Frédéric Lefebvre ◽  
Piotr Putaj ◽  
Jean-Marie Basset ◽  
XuXu Wang ◽  
XianZhi Fu
Keyword(s):  
Mesoporous Materials ◽  
Catalytic Properties ◽  
Organometallic Complexes
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