Hexagonally ordered mesoporous ternary Li2O–TiO2–P2O5 oxides with high lithium content

2005 ◽  
pp. 5187 ◽  
Author(s):  
Donglin Li ◽  
Haoshen Zhou ◽  
Itaru Honma ◽  
Masaki Ichihara
Keyword(s):  
Lithium Content ◽  
Ordered Mesoporous ◽  
Hexagonally Ordered

A Rational Repeating Template Method for Synthesis of 2 D Hexagonally Ordered Mesoporous Precious Metals

2010 ◽  
Vol 6 (3) ◽  
pp. 881-887 ◽  
Author(s):  
Azusa Takai ◽  
Yoji Doi ◽  
Yusuke Yamauchi ◽  
Kazuyuki Kuroda
Keyword(s):  
Precious Metals ◽  
Template Method ◽  
Ordered Mesoporous ◽  
Hexagonally Ordered

scholarly journals Laccase Immobilisation on Mesostructured Silicas

2012 ◽  
Vol 33 (4) ◽  
pp. 611-620 ◽  
Author(s):  
Jolanta Bryjak ◽  
Katarzyna Szymańska ◽  
Andrzej B. Jarzębski
Keyword(s):  
Thermal Inactivation ◽  
Mesoporous Silicas ◽  
Native Enzyme ◽  
Covalent Attachment ◽  
Initial Activity ◽  
Ordered Mesoporous ◽  
Extracellular Laccase ◽  
Activity Loss ◽  
Activity Decay ◽  
Hexagonally Ordered

Extracellular laccase produced by the wood-rotting fungus Cerrena unicolor was immobilised covalently on the mesostructured siliceous foam (MCF) and three hexagonally ordered mesoporous silicas (SBA-15) with different pore sizes. The enzyme was attached covalently via glutaraldehyde (GLA) or by simple adsorption and additionally crosslinked with GLA. The experiments indicated that laccase bound by covalent attachment remains very active and stable. The best biocatalysts were MCF and SBA-15 with Si-F moieties on their surface. Thermal inactivation of immobilised and native laccase at 80°C showed a biphasic-type activity decay, that could be modelled with 3- parameter isoenzyme model. It appeared that immobilisation did not significantly change the mechanism of activity loss but stabilised a fraction of a stable isoform. Examination of time needed for 90% initial activity loss revealed that immobilisation prolonged that time from 8 min (native enzyme) up to 155 min (SBA-15SF).

scholarly journals Mesoporous Silica as a Drug Delivery System for Naproxen: Influence of Surface Functionalization

Molecules ◽  
2020 ◽  
Vol 25 (20) ◽  
pp. 4722
Author(s):  
Lukáš Žid ◽  
Vladimír Zeleňák ◽  
Miroslav Almáši ◽  
Adriana Zeleňáková ◽  
Jaroslava Szücsová ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Surface Functionalization ◽  
High Performance ◽  
Nitrogen Adsorption ◽  
Ethanol Solution ◽  
Physiological Solution ◽  
Ordered Mesoporous ◽  
Ft Ir ◽  
Hexagonally Ordered ◽  
Adsorption Desorption

In this work we describe the relationship between surface modification of hexagonally ordered mesoporous silica SBA-15 and loading/release characteristics of nonsteroidal anti-inflammatory drug (NSAID) naproxen. Mesoporous silica (MPS) was modified with 3-aminopropyl, phenyl and cyclohexyl groups by grafting method. Naproxen was adsorbed into pores of the prepared MPS from ethanol solution using a solvent evaporation method. The release of the drug was performed in buffer medium at pH 2 and physiological solution at pH 7.4. Parent MPSs as well as naproxen loaded MPSs were characterized using physicochemical techniques such as nitrogen adsorption/desorption, thermogravimetric analysis (TG), Zeta potential analysis, Fourier transform infrared spectroscopy (FT-IR), and elemental analysis. The amount of naproxen released from the MPSs into the medium was determined by high-performance liquid chromatography (HPLC). It was shown that the adsorption and desorption characteristics of naproxen are dependent on the pH of the solution and the surface functionalization of the host.

Synthesis of Fructone and Acylal Using Hexagonally Ordered Mesoporous Aluminosilicate Catalyst

2008 ◽  
Vol 73 (8-9) ◽  
pp. 1112-1124 ◽  
Author(s):  
Ajayan Vinu ◽  
Josena Justus ◽  
Veerappan Vaithilingam Balasubramanian ◽  
Shivappa Basappa Halligudi ◽  
Katsuhiko Ariga ◽  
...  
Keyword(s):  
Carbonyl Compounds ◽  
Phase Reaction ◽  
Reaction Conditions ◽  
Structure Directing Agent ◽  
Pluronic P123 ◽  
Ordered Mesoporous ◽  
Temperature Programmed ◽  
Hexagonally Ordered ◽  
Adsorption Desorption ◽  
Ionic Copolymer

Hexagonally ordered mesoporous AlSBA-15 with different nSi/nAl ratios have been hydrothermally synthesized using the non-ionic copolymer Pluronic P123 surfactant as the structure directing agent and characterized by XRD, N2 adsorption-desorption, and ammonia-temperature programmed desorption (pyridine-TPD). Acetal and acylal formation reactions of organic carbonyl compounds were efficiently catalyzed by AlSBA-15 under liquid-phase reaction conditions and the results were compared with the MFI, BEA and AlMCM-41(23). Of the catalysts studied, AlSBA-15(45) showed the highest activity in both the acetalization and acylal reactions of the carbonyl compounds under the optimized reaction conditions, and could be recycled several times without loss in activity. AlSBA-15(45) catalyst is highly stable, efficient, chemoselective, and environmental friendly, which could open the possibility for environment benign approach for the synthesis of acetals, acylals and its derivatives under mild reaction conditions.

Novel synthesis of tetrahydro-β-carbolines and tetrahydroisoquinolines via three-component reaction using hexagonally ordered mesoporous AlSBA-15 catalysts

2010 ◽  
Vol 51 (4) ◽  
pp. 702-706 ◽  
Author(s):  
Ajayan Vinu ◽  
Pranjal Kalita ◽  
Leila Samie ◽  
Murugulla Adharvana Chari ◽  
Ravindra Pal ◽  
...  
Keyword(s):  
Novel Synthesis ◽  
Ordered Mesoporous ◽  
Three Component Reaction ◽  
Hexagonally Ordered

scholarly journals Defocus image contrast in hexagonally-ordered mesoporous material

2011 ◽  
Vol 13 (3) ◽  
pp. 1189-1200
Author(s):  
S. Nakahara ◽  
D. A. Tanner ◽  
S. Hudson ◽  
E. Magner ◽  
W. Redington ◽  
...  
Keyword(s):  
Mesoporous Material ◽  
Image Contrast ◽  
Ordered Mesoporous ◽  
Ordered Mesoporous Material ◽  
Hexagonally Ordered
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