Synthesis and properties of microporous sol–gel silica membranes

Lenza, Rubia F. S.; Vasconcelos, Wander L.

doi:10.1016/s0022-3093(00)00163-0

Cited by 40 publications

(21 citation statements)

References 7 publications

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“…Therefore, as the increase of R w value, the microspheres inner structure consisted of very dense silica matrix surrounding some globules. These results, indicative of more complete hydrolysis and greater density with increasing R w , are in agreement with other workers (28,29). Similar results have been reported by Yu and co-workers (30).…”

Section: Resultssupporting

confidence: 93%

Preparation of Silica Particles Encapsulating Retinol Using O/W/O Multiple Emulsions

Lee

Moon

et al. 2001

Journal of Colloid and Interface Science

113

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Section: Resultssupporting

confidence: 93%

Preparation of Silica Particles Encapsulating Retinol Using O/W/O Multiple Emulsions

Lee

Moon

et al. 2001

Journal of Colloid and Interface Science

113

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“…The isotherms exhibit Type I behavior and a higher hydrolysis ratio results in a bigger pore volume, which was also observed by Elferink et al [29] and by Lenza and Vasconcelos [30].…”

Section: Encapsulation Of Decanoic Acid In Sol-gel-made Particlessupporting

confidence: 76%

Encapsulation and retention of decanoic acid in sol–gel-made silicas

Veith

Perren

Pratsinis

2005

Journal of Colloid and Interface Science

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“…Unlike conventional glass, which is a viscous fluid that results from the fusion of SiO 2 at high temperature, sol-gel-derived silica is obtained at mild conditions [3] compatible with the stability of most bioactive compounds. The sol-gel process is capable of generating materials with controlled surface properties and pore structures between 1 -500 nm [4][5][6][7]. The matrix of the silica thus formed can be exploited for immobilization of biomolecules or cations, inorganic membranes and support for catalysts [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Sol-Gel-Derived Porous Silica: Economic Synthesis and Characterization

Essien¹,

Olaniyi²,

Adams³

et al. 2012

JMMCE

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Porous silica was synthesized via the sol-gel process using clay obtained locally from Ijero-Ekiti in Ekiti State, Nigeria and compared with silica synthesized under similar conditions from sodium metasilicate (Na 2 SiO 3 ) obtained comercially. The clay was initially refluxed with sodium hydroxide (NaOH) for 2 hours to extract SiO 2 to form Na 2 SiO 3 , which was subsequently hydrolyzed to form a gel. The gel obtained was washed with deionized water to get rid of impurities, dried and calcined at 800˚C for 3 hours. The obtained silica powders were characterized using atomic absorption spectrophotometer, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results showed that the vibrational modes and diffraction patterns of the silica derived from commercial Na 2 SiO 3 and that prepared from clay were similar containing pure amorphous SiO 2 . The morphology of the commercially obtained silica showed better arrangement of particles and exhibited slightly lesser porosity (62.4%) compared to that derived from clay which had a porosity of 65.5%. The result indicates that clay has a potential for use as an environmentally safe and economic starting material for preparing porous silica instead of high quality precursors.

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Synthesis and properties of microporous sol–gel silica membranes

Cited by 40 publications

References 7 publications

Preparation of Silica Particles Encapsulating Retinol Using O/W/O Multiple Emulsions

Preparation of Silica Particles Encapsulating Retinol Using O/W/O Multiple Emulsions

Encapsulation and retention of decanoic acid in sol–gel-made silicas

Sol-Gel-Derived Porous Silica: Economic Synthesis and Characterization

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