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A Sol-Gel introduction by Jean Phalippou - May 2000

T1 - Facile sol-gel synthesis of porous silicas using poly(propylene)imine dendrimers as templates

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Several articles in the Journal of Sol-Gel Science and Technology

Bibliographie :

T1 - Sol-gel synthesis and characterization of microporous silica membranes

ABSTRACT: In the present study, the synthesis of bioactive glass powder is carried out using the sol-gel method and in an acidic environment. TEOS (Tetraethyl orthosilicate) is used as the raw material of supplying Silica and TEP (three ethyl phosphates) is used as the raw material for providing phosphate powder compounds. Synthesis is done without water and using pure alcohol solvent 99.99%. After preparation of powder from the gel and drying it, the heat treatment process was performed at 500, 550 and 600 C for 2 hours on the powder. Thus, the bioactive glass powder was prepared for the SPS stage. In the present study due to technological limitations (impossibility of access to the high pressures of the SPS device used), at the formation stage, the maximum force of 20 tons was selected using the SPS device. Experiments performed on the powder include XRD and DTA. The results of this research show that performing heat treatment at a maximum temperature of 550°C with the aim of increasing the maintenance of the amorphous structure of the product is the most ideal temperature for heat treatment. Also, the use of suitable molds in the SPS process with a tolerance of up to 300 MPa is a requirement of the process.

T1 - Synthesis of silica nanofluid and application to CO2 absorption

Tehrani M. M, Sobhani M. Synthesis of Bioactive Glass Powder using Sol-Gel Method and Shaping using Plasma Spark Sintering. Biosci Biotech Res Asia 2017;14(4).

Tehrani M. M, Sobhani M. Synthesis of Bioactive Glass Powder using Sol-Gel Method and Shaping using Plasma Spark Sintering. Biosci Biotech Res Asia 2017;14(4). Available from:

T1 - Synthesis of SiO2 nanostructures using sol-gel method

The gyration radius appears lower than the silica one and is equal to 7 nm after 24 hrs.

Silica seems to condense around ZrO2 particles up to the gel point (11hrs) and leads to an homogeneous at the nanosize level network of SiO2 and ZrO2.

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  • Prassas and maintained by the worldwide Sol-Gel community.

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  • Hye,my last experiment is about silica aerogel

    Polymeric silica sols were prepared by hydrolysis and condensation of alkoxide.

  • I want know formation enthalpy of silica aerogel.

    Fractal dimensions and radii of gyration of sols and gels with different synthesis chemistry are compared.

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D. can these materials be deployed and then removed/stored easily?

This procedure was adopted after investigating separately the reactivities of both silica and zirconia sols.

Q: What sort of bonding is involved with Silica erogel?

This paper describes a sol−gel approach for the coating of superparamagnetic iron oxide nanoparticles with uniform shells of amorphous silica. The coating process has been successfully applied to particles contained in a commercial ferrofluid (e.g., the EMG 304 of Ferrofluidics) and those synthesized through a wet chemical process. The thickness of silica coating could be conveniently controlled in the range of 2−100 nm by changing the concentration of the sol−gel solution. Fluorescent dyes, for example, 7-(dimethylamino)-4-methylcoumarin-3-isothiocyanate (DACITC) and tetramethylrhodamine-5-isothiocyanate (5-TRITC), have also been incorporated into the silica shells by covalently coupling these organic compounds with the sol−gel precursor. These multifunctional nanoparticles are potentially useful in a number of areas because they can be simultaneously manipulated with an externally applied magnetic field and characterized in situ using conventional fluorescence microscopy.

Hello. I have a question about the sol-gel process and nanoparticles.

This research reveals that precipitation of silica products from acid dissolution of minerals can be studied apart from the mineral dissolution process.

My Question is will this solution work for an X-Aerogel.

Thus, silica product precipitation from mineral acidization follows a two-step process − formation of 5 nm primary particles followed by particle flocculation − which becomes exponentially faster with increasing HCl concentration and with salts accelerating the process in the above order.

please help me. i dont wanna use sol-gel method i.e use TEOS

A viscous flow sintering is a convenient way to densify silica compound.
Monoliths obtained from supercritical drying offer the best example of a viscous flow sintering which provides dense silica glass at low temperature (1200°C) and for a short duration of treatment (10 minutes).
It is worth noticing that the nature and the quantity of impurities and more precisely alkali ions play a very important role on the tendency to crystallize.
The other family of xerogels concerns those that crystallize during heat treatment.

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