Surfactant Solubilization and the Direct Encapsulation of Interfacially Active Phenols in Mesoporous Silicas

Langmuir ◽  
2008 ◽  
Vol 24 (3) ◽  
pp. 1031-1036 ◽  
Author(s):  
Grace Tan ◽  
Christy Ford ◽  
Vijay T. John ◽  
Jibao He ◽  
Gary L. McPherson ◽  
...  
Keyword(s):  
Mesoporous Silicas ◽  
Surfactant Solubilization

scholarly journals Piroxicam Loading onto Mesoporous Silicas by Supercritical CO2 Impregnation

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2500
Author(s):  
Marta Gallo ◽  
Luca Serpella ◽  
Federica Leone ◽  
Luigi Manna ◽  
Mauro Banchero ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Water Solubility ◽  
Solid Dispersions ◽  
Mesoporous Silicas ◽  
Incipient Wetness Impregnation ◽  
Pore Blocking ◽  
Physico Chemical ◽  
Adsorption From Solution ◽  
First Time ◽  
Loading Procedure

Piroxicam (PRX) is a commonly prescribed nonsteroidal anti-inflammatory drug. Its efficacy, however, is partially limited by its low water solubility. In recent years, different studies have tackled this problem and have suggested delivering PRX through solid dispersions. All these strategies, however, involve the use of potentially harmful solvents for the loading procedure. Since piroxicam is soluble in supercritical CO2 (scCO2), the present study aims, for the first time, to adsorb PRX onto mesoporous silica using scCO2, which is known to be a safer and greener technique compared to the organic solvent-based ones. For comparison, PRX is also loaded by adsorption from solution and incipient wetness impregnation using ethanol as solvent. Two different commercial mesoporous silicas are used (SBA-15 and Grace Syloid® XDP), which differ in porosity order and surface silanol population. Physico-chemical analyses show that the most promising results are obtained through scCO2, which yields the amorphization of PRX, whereas some crystallization occurs in the case of adsorption from solution and IWI. The highest loading of PRX by scCO2 is obtained in SBA-15 (15 wt.%), where molecule distribution appears homogeneous, with very limited pore blocking.

scholarly journals Effects of morphology and pore size of mesoporous silicas on the efficiency of an immobilized enzyme

RSC Advances ◽  
2021 ◽  
Vol 11 (17) ◽  
pp. 10010-10017
Author(s):  
Ping-Chung Kuo ◽  
Zhi-Xun Lin ◽  
Tzi-Yi Wu ◽  
Chun-Han Hsu ◽  
Hong-Ping Lin ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Mesoporous Silica ◽  
Pore Size ◽  
Immobilized Enzyme ◽  
Mesoporous Silicas ◽  
High Loading ◽  
Loading Capacity ◽  
Silica Films

Mesoporous silica films were used as supports with high loading capacity and enzyme activity.

Gold nanoparticles grown on hydrophobic and texturally-tunable PDMS-like framework

2021 ◽  
Author(s):  
Marieme Kacem ◽  
Nadia Katir ◽  
Jamal El Haskouri ◽  
Abdellatif Essoumhi ◽  
Abdelkrim El Kadib
Keyword(s):  
Gold Nanoparticles ◽  
Surface Area ◽  
Metal Clusters ◽  
High Surface ◽  
High Surface Area ◽  
Mesoporous Silicas

Mesoporous silicas are among the most suitable high-surface area solids to support small-sized metal clusters and nanoparticles. Unfortunately, the instability of silica in water constitutes a serious impedement for its...

scholarly journals Design of Nano-Sized Pt Metals Synthesized on Ti-Containing Mesoporous Silicas and Efficient Catalytic Application for NO Reduction

2008 ◽  
Vol 49 (3) ◽  
pp. 398-401 ◽  
Author(s):  
Kohsuke Mori ◽  
Sayoko Shironita ◽  
Toshiaki Shimizu ◽  
Takao Sakata ◽  
Hirotaro Mori ◽  
...  
Keyword(s):  
No Reduction ◽  
Mesoporous Silicas ◽  
Catalytic Application

Functionalization of large-pore mesoporous silicas with organosilanes by direct synthesis

2004 ◽  
Vol 72 (1-3) ◽  
pp. 33-42 ◽  
Author(s):  
A.S Maria Chong ◽  
X.S Zhao ◽  
Angeline T Kustedjo ◽  
S.Z Qiao
Keyword(s):  
Direct Synthesis ◽  
Mesoporous Silicas ◽  
Large Pore

Pore topology control of supported on mesoporous silicas copper and cerium oxide catalysts for ethyl acetate oxidation

2013 ◽  
Vol 180 ◽  
pp. 156-161 ◽  
Author(s):  
Tanya Tsoncheva ◽  
Gloria Issa ◽  
José M. López Nieto ◽  
Teresa Blasco ◽  
Patricia Concepcion ◽  
...  
Keyword(s):  
Ethyl Acetate ◽  
Cerium Oxide ◽  
Topology Control ◽  
Oxide Catalysts ◽  
Mesoporous Silicas ◽  
Acetate Oxidation

Tailored Mesoporous Silicas: From Confinement Effects to Catalysis

2009 ◽  
Vol 1217 ◽  
Author(s):  
A. C. Buchanan, III ◽  
Michelle K. Kidder
Keyword(s):  
Chemical Reactivity ◽  
High Surface ◽  
High Surface Area ◽  
Mesoporous Silicas ◽  
Surface Immobilization ◽  
Product Selectivity ◽  
Aryl Ether ◽  
Ether Linkage ◽  
Synthetic Methodologies ◽  
The Impact

AbstractOrdered mesoporous silicas continue to find widespread use as supports for diverse applications such as catalysis, separations, and sensors. They provide a versatile platform for these studies because of their high surface area and the ability to control pore size, topology, and surface properties over wide ranges. Furthermore, there is a diverse array of synthetic methodologies for tailoring the pore surface with organic, organometallic, and inorganic functional groups. In this paper, we will discuss two examples of tailored mesoporous silicas and the resultant impact on chemical reactivity. First, we explore the impact of pore confinement on the thermochemical reactivity of phenethyl phenyl ether (PhCH2CH2OPh, PPE), which is a model of the dominant β-aryl ether linkage present in lignin derived from woody biomass. The influence of PPE surface immobilization, grafting density, silica pore diameter, and presence of a second surface-grafted inert “spacer” molecule on the product selectivity has been examined. We will show that the product selectivity can be substantially altered compared with the inherent gas-phase selectivity. Second, we have recently initiated an investigation of mesoporous silica supported, heterobimetallic oxide materials for photocatalytic conversion of carbon dioxide. Through surface organometallic chemistry, isolated M-O-M’ species can be generated on mesoporous silicas that, upon irradiation, form metal to metal charge transfer bands capable of converting CO2 into CO. Initial results from studies of Ti(IV)-O-Sn(II) on SBA-15 will be presented.

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