Sol–gel synthesis and structure of silica hybrid materials

Samuneva, B.; Kabaivanova, Lyudmila; Chernev, Georgi; Djambaski, P.; Kashchieva, E.; Эмануилова, Э.; Salvado, Isabel M. Miranda; Fernandes, Maria Helena; Wu, Aiying

doi:10.1007/s10971-008-1799-8

Cited by 22 publications

(9 citation statements)

References 35 publications

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“…In the field of water and wastewater treatment, micro and ultrafiltration through an inorganic membrane are most promising technologies [1,10,11].…”

Section: Introductionmentioning

confidence: 99%

Silica porous membranes synthesis and characterization

Agoudjil

Larbot

2014

Desalination and Water Treatment

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Membranes can be made by various methods and are generally classified as either organic or inorganic. In recent years there has been a growing interest in the use of inorganic membranes for several industrial and laboratory applications. This is because they offer many advantages over commercial organic membranes, the most important of which are: steam sterilizability, resistance to organic solvents, longer lifetime, with standing cleaning by bleaching, and oxidizing agents. For applications in ultrafiltration UF and reverse osmosis RO, the sol-gel process provides the technique for producing thin ceramic porous layers with controllable porosity on a wide range of chemically resistant macroporous substrates. In this work, we have used two sol-gel procedures for obtaining inorganic membranes: polymerization of molecular units (PMU) and destabilization of colloidal solutions (DSC). The first (PMU) concerns polymeric oxide gels made in our case from metal alkoxide Si (OC 2 H 5 ) 4 . Hydrolysis and polymerization reactions are very important for the properties of gel. The second process (DSC) is the destabilization of colloidal solution; we use peptization of hydrous metal oxide with an electrolyte. These colloidal solutions are then destabilized for instance by increasing the compounds concentration in the solution (by evaporation) thus gelation occurs. Thin membrane layer was deposited on a porous support. This is possible by infiltrating a low viscosity sol or by direct coating onto an ultrafiltration layer. Membranes produced using the two procedures were examined by X-ray diffraction, infrared spectroscopy, differential thermal analysis, nitrogen adsorption-desorption, and scanning electron spectroscopy. The control of sol-gel transition and thermal decomposition has allowed us the synthesis of silica membranes destined at separation, concentration, or purification of chemical species.

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“…In the field of water and wastewater treatment, micro and ultrafiltration through an inorganic membrane are most promising technologies [1,10,11].…”

Section: Introductionmentioning

confidence: 99%

Silica porous membranes synthesis and characterization

Agoudjil

Larbot

2014

Desalination and Water Treatment

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“…In recent years, organic-inorganic hybrid materials have been extensively investigated as a promising advanced materials because they combine advantages of inorganic and organic materials [1,2]. Usually, most organic-inorganic hybrid materials are thermally cured [3][4][5], but some of them are cured by UV light yet [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Preparation and stability of silica sol/TPGDA dispersions and its application in the UV-curable hybrid coatings for fire protection

Shang

Hang

Jin

et al. 2013

J Sol-Gel Sci Technol

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A series of silica sols modified by c-methacryloxypropyltrimethoxysilane (MPS) were synthesized by the acid-catalyzed sol-gel method, and then the solvent in these sols were extracted under several vacuum distillation conditions. The stability of the sol after the distillation can be improved by means of increasing the dosage of MPS and incorporating reactive diluent TPGDA into the sol as new dispersion medium. Optimized samples have maintained stable for over 180 days. The sol dispersions and UV-curable organic compounds were mixed to form the hybrid coatings for fire protection. Effects of the distillation treatment and the cosolvent anhydrous ethanol added into the reaction solution on thermal and combustion performances and physical properties of the hybrid coatings were studied by thermogravimetric analysis, microscale combustion calorimeter, limit oxygen index test and UL-94 horizontal test, etc. The results showed that the distillation treatment for the sol was necessary to improve thermal performance and physical properties of the hybrid coatings. In addition, in the flammability experiment, hybrid coatings showed a quick and efficient protection of the substrate.

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“…In our previous works we have compared pure silica matrices with inorganic-organic hybrid matrices obtained by using different inorganic precursors: tetraethylortosilicate (teoS), tetramethylortosilicate (tMoS), ethyltrimethoxysilane (etMS), methyltriethoxysilane (MteS) and an organic compound such as: polyethylene oxide (Peo), polyacrylamide gel (PAAG), ca alginate, gelatin and others (5,10,19). …”

Section: Introductionmentioning

confidence: 99%