Ionic liquid template assisted synthesis of porous nano-silica nails

RSC Advances ◽  
2014 ◽  
Vol 4 (75) ◽  
pp. 39978-39983 ◽  
Author(s):  
Yogendra Lal Verma ◽  
Rajendra Kumar Singh ◽  
Il-Kwon Oh ◽  
Suresh Chandra
Keyword(s):  
Ionic Liquid ◽  
Porous Materials ◽  
Sol Gel ◽  
Porous Silica ◽  
Nano Silica ◽  
Gelation Rate ◽  
Template Assisted Synthesis

Our planned strategy to obtain porous materials was to synthesize porous silica at a fast gelation rate which can be attained by using non-hydrolytic sol–gel route with high ionic liquid (IL)-loading.

Synergic effects of a protic ionic liquid on P123 mixed micelles for inducing hierarchical porous materials

RSC Advances ◽  
2015 ◽  
Vol 5 (66) ◽  
pp. 53267-53274 ◽  
Author(s):  
Shuo Zhao ◽  
Xiaoli Sheng ◽  
Yuming Zhou ◽  
Man He ◽  
Xiaoqin Fu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Porous Materials ◽  
Formation Mechanism ◽  
Mixed Micelles ◽  
Porous Silica ◽  
Protic Ionic Liquid ◽  
Hierarchical Porous

Postulated formation mechanism of hierarchical porous silica.

scholarly journals Development of Novel Oral Formulations of Disulfide Antioxidants Based on Porous Silica for Controlled Release of the Drugs

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 963
Author(s):  
Ekaterina S. Dolinina ◽  
Elena V. Parfenyuk
Keyword(s):  
Antioxidant Activity ◽  
Surface Chemistry ◽  
Sol Gel ◽  
Porous Silica ◽  
The Body ◽  
Oral Drug ◽  
Therapeutic Concentration ◽  
Release Process ◽  
Zero Order Kinetics ◽  
Long Time

Powerful antioxidant α-lipoic acid (LA) exhibits limited therapeutic efficiency due to its pharmacokinetic properties. Therefore, the purpose of this work was to evaluate the ability of silica-based composites of LA as well as its amide (lipoamide, LM), as new oral drug formulations, to control their release and maintain their therapeutic concentration and antioxidant activity in the body over a long time. The composites synthesized at different sol–gel synthesis pH and based on silica matrixes with various surface chemistry were investigated. The release behavior of the composites in media mimicking pH of digestive fluids (pH 1.6, 6.8, and 7.4) was revealed. The effects of chemical structure of the antioxidants, synthesis pH, surface chemistry of the silica matrixes in the composites as well as the pH of release medium on kinetic parameters of the drug release and mechanisms of the process were discussed. The comparative analysis of the obtained data allowed the determination of the most promising composites. Using these composites, modeling of the release process of the antioxidants in accordance with transit conditions of the drugs in stomach, proximal, and distal parts of small intestine and colon was carried out. The composites exhibited the release close to the zero order kinetics and maintained the therapeutic concentration of the drugs and antioxidant effect in all parts of the intestine for up to 24 h. The obtained results showed that encapsulation of LA and LM in the silica matrixes is a promising way to improve their bioavailability and antioxidant activity.

Sol–Gel and Hard Template Assisted Synthesis of 3D Nanostructured SnO2 Electrodes

2010 ◽  
Vol 10 (7) ◽  
pp. 4273-4278 ◽  
Author(s):  
U. Lafont ◽  
S. Waichman ◽  
M. Valvo ◽  
E. M. Kelder
Keyword(s):  
Sol Gel ◽  
Hard Template ◽  
Template Assisted Synthesis

Supported hydrophobic ionic liquid on nano-silica for adsorption of lead

2011 ◽  
Vol 166 (1) ◽  
pp. 157-167 ◽  
Author(s):  
Mohamed E. Mahmoud ◽  
Hassan M. Al-Bishri
Keyword(s):  
Ionic Liquid ◽  
Nano Silica ◽  
Hydrophobic Ionic Liquid

Bioencapsulation in Sol-Gel Glasses

1998 ◽  
Vol 519 ◽  
Author(s):  
L. Bergogne ◽  
S. Fennouh ◽  
J. Livage ◽  
C. Roux
Keyword(s):  
Sol Gel ◽  
Porous Silica ◽  
Silica Matrix ◽  
Whole Cells ◽  
The Past ◽  
Wide Range ◽  
Activity Of Enzymes ◽  
Gel Glasses ◽  
Micro Organisms

AbstractBioencapsulation in sol-gel materials has been widely studied during the past decade. Trapped species appear to retain their bioactivity in the porous silica matrix. Small analytes can diffuse through the pores allowing bioreactions to be performed in-situ, inside the sol-gel glass. A wide range of biomolecules and micro-organisms have been encapsulated. The catalytic activity of enzymes is used for the realization of biosensors or bioreactors. Antibody-antigen recognition has been shown to be feasible within sol-gel matrices. Trapped antibodies bind specifically the corresponding haptens and can be used for the detection of traces of chemicals. Even whole cells are now encapsulated without any alteration of their cellular organization. They can be used for the production of chemicals or as antigens for immunoassays.

Sol-Gel Derived Silica Layers for Low-k Dielectrics Applications

2000 ◽  
Vol 612 ◽  
Author(s):  
Sylvie Acosta ◽  
André Ayral ◽  
Christian Guizard ◽  
Charles Lecornec ◽  
Gérard Passemard ◽  
...  
Keyword(s):  
Average Pore Size ◽  
Sol Gel ◽  
Porous Silica ◽  
Thin Layers ◽  
Gaseous Ammonia ◽  
Potential Candidate ◽  
Average Pore ◽  
Synthesis Strategy ◽  
Silica Layers ◽  
Highly Porous

AbstractPorous silica exhibits attractive dielectric properties, which make it a potential candidate for use as insulator into interconnect structures. A new way of preparation of highly porous silica layers by the sol-gel route was investigated and is presented. The synthesis strategy was based on the use of common and low toxicity reagents and on the development of a simple process without gaseous ammonia post-treatment or supercritical drying step. Defect free layers were deposited by spin coating on 200 mm silicon wafers and characterized. Thin layers with a total porosity larger than 70% and an average pore size of 5 nm were produced. The dielectric constant measured under nitrogen flow on these highly porous layers is equal to ∼ 2.5, which can be compared to the value calculated from the measured porosity, ∼ 1.9. This difference is explained by the presence of water adsorbed on the hydrophilic surface of the unmodified silica.

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