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Fardad, M. A.

doi:10.1023/a:1004749107134

Cited by 84 publications

(35 citation statements)

References 16 publications

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“…Focus of investigations was on control of pore size and volume fraction for adjusting the refractive index of the SiO 2 films. In the sol-gel colloidal SiO 2 coating process, porosity is related to particle size and distribution of the SiO 2 sol from which the film is obtained [7], as well as to the curing temperature of the coating on glass [5,8,13,15]. Size distribution of oxide nanocrystals was reported to have a crucial affect on enhancing various properties [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of acid, water and alcohol ratios on sol-gel preparation of antireflective amorphous SiO2 coatings

Kesmez

Burunkaya

Kiraz

et al. 2011

Journal of Non-Crystalline Solids

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Section: Introductionmentioning

confidence: 99%

Effect of acid, water and alcohol ratios on sol-gel preparation of antireflective amorphous SiO2 coatings

Kesmez

Burunkaya

Kiraz

et al. 2011

Journal of Non-Crystalline Solids

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“…Nanosilica was successfully synthesized by various methods, including the sol-gel method, vapor-phase reaction, and the thermal decomposition method [2][3][4][5]. The sol-gel method presents many processing merits, due to facility, consistency, and cheapness, and obtained materials which have good purity and homogeneity [6,7]. In the synthesis process of nanosilica by sol-gel method, the particle size, the mean pore size, and the particle size distribution of the product can be controlled by several parameters, such as the molar ratio of water to precursor, type of catalyst, and gelation and drying temperatures.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Silica Nanoparticles by Ultrasound‐Assisted Sol‐Gel Method: Optimized by Taguchi Robust Design

Edrissi¹,

Soleymani²,

Adinehnia³

2011

Chem Eng & Technol

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Silica nanoparticles were prepared by ultrasound-assisted and conventional solgel method. The synthesis procedures were designed and optimized by the Taguchi experimental design method. Molar concentrations of TEOS, H 2 O, NH 4 OH, and reaction temperature were chosen as main factors. The results showed that the molar concentration of ammonia is the main factor which affects the particle size of the silica nanoparticles. The chemical structure, size, and morphology of the product were investigated by X-ray diffraction, Fourier transform infrared spectroscopy, laser light scattering, and scanning electron microscopy. By the optimum conditions of the ultrasound-assisted sol-gel method, silica nanoparticles with an average particle size of 13 nm were prepared.

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“…The properties of hybrids, such as the film thickness, shrinkage, porosity, and optical quality, strongly depend on the reaction conditions and the type of catalyst used in the preparation of the initial solution from which hybrids are produced. 15 In the formation of hybrids, the hydrolysis of silicon alkoxides by water proceeds at low reaction rates. However, acid or base catalysts can increase reaction rates.…”

Section: Introductionmentioning

confidence: 99%

Silicon‐29 and carbon‐13 nuclear magnetic resonance identification of intermediates developed during the formation of a hybrid based on tetraethoxysilane (TEOS) and 4‐[(5‐dichloromethyl)(silyl)pentyloxy]cyanobenzene (DCN)

Trejo‐Durán

Martínez‐Richa

Vera‐Graziano

et al. 2005

J of Applied Polymer Sci

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During the formation of organic-inorganic hybrid materials by the sol-gel process, the observation of multiphase systems at different stages of the reaction is not uncommon. An assessment of the chemical species formed before and after gelation is not an easy task because complex mixtures are generally found in these systems. In this study, the identification of intermediates developed during the formation of a hybrid obtained from tetraethoxysilane (TEOS) and 4-[(5-dichloromethylsilyl)pentyloxy]cyanobenzene monomer has been undertaken. Solution and solid-state 29 Si-and 13 C-NMR spectra, recorded at different degrees of conversion, allow the elucidation of the mechanism of hybrid formation. 4-[(5-dichloromethylsilyl)pentyloxy]cyanobenzene, (DCN), DCN-TEOS cyclosiloxanes and low-molecularweight linear copolysiloxanes are formed in the early stages of the process and before gelation occur. Before the gel is formed, cyclic species undergo an acid-catalyzed ring-opening copolymerization with silica to produce a random copolymer. Other intermediates of the Q ij type (where Q indicates a four-functional silicon, the first subscript indicates the number of siloxane bridges connected to the silicon site, and the second subscript indicates the number of silanol groups) that develop before the gel is formed have also been identified. Spectral peak patterns of the final hybrid, observed in solid-state 29 Si and 13 C-NMR spectra, are also discussed.

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Untitled

Cited by 84 publications

References 16 publications

Effect of acid, water and alcohol ratios on sol-gel preparation of antireflective amorphous SiO2 coatings

Effect of acid, water and alcohol ratios on sol-gel preparation of antireflective amorphous SiO2 coatings

Synthesis of Silica Nanoparticles by Ultrasound‐Assisted Sol‐Gel Method: Optimized by Taguchi Robust Design

Silicon‐29 and carbon‐13 nuclear magnetic resonance identification of intermediates developed during the formation of a hybrid based on tetraethoxysilane (TEOS) and 4‐[(5‐dichloromethyl)(silyl)pentyloxy]cyanobenzene (DCN)

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