Effects of solvent on TEOS hydrolysis kinetics and silica particle size under basic conditions

Malay, Özge; Yilgör, Iskender; Menceloǵlu, Yusuf́ Z.

doi:10.1007/s10971-013-3088-4

Cited by 59 publications

(39 citation statements)

References 32 publications

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“…Next, the degree of crosslinking of the sols will be studied in-depth via ATR-FTIR and 29 Si NMR. Multiple research groups [33][34][35][36][37][38][39][40] have performed 29 Si NMR studies on sols with varying compositions and r ratios, with r the H2O/Si molar ratio. Brinker et al [33] conducted 29 Si NMR measurements on silica sols for conventional fiber drawing.…”

Section: Figure 1: Schematic Overview Of the Sol Parameters Influencimentioning

confidence: 99%

“…Brinker et al [33] conducted 29 Si NMR measurements on silica sols for conventional fiber drawing. Malay et al [39] and Sadasivan et al [40] combined 29 Si NMR and DLS for a detailed study of the effect of the solvent on silica synthesis. In this paper the size of colloidal species in the sols will be evaluated via DLS.…”

Section: Figure 1: Schematic Overview Of the Sol Parameters Influencimentioning

confidence: 99%

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The influence of tetraethoxysilane sol preparation on the electrospinning of silica nanofibers

Geltmeyer

Roo

Broeck

et al. 2015

J Sol-Gel Sci Technol

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The critical parameters determining the electrospinning of silica nanofibers starting from tetraethoxysilane sols are reported. By controlling the reaction conditions, the rheological properties of the sol allowed for electrospinning without needing the addition of an organic polymer. This allows the polymer removal step, which is deleterious to the fibers and an economic and ecological inconvenience, to be skipped. The effects on the electrospinning process of the viscosity of the sol, the concentration of ethanol, the degree of crosslinking and the size of the colloidal species were studied in depth with ATR-FTIR, Si-29 NMR, H-1 NMR and DLS. Moreover, to separate the contributions of the different parameters three different set-ups for sol preparation were used. An optimum amount of 9 mol L-1 ethanol for electrospinning was determined. In addition, the optimum degree of crosslinking and size of colloidal particles, approximately 3.5-7 nm, were obtained for stable electrospinning and for producing uniform, beadless nanofibers that were stable in time. The optimum viscosity range is in between 100 and 200 mPa s, which is in line with previous work. Using these optimum conditions, continuous electrospinning was carried out for 3 h, resulting in large flexible silica nanofibrous membranes

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Section: Figure 1: Schematic Overview Of the Sol Parameters Influencimentioning

confidence: 99%

Section: Figure 1: Schematic Overview Of the Sol Parameters Influencimentioning

confidence: 99%

The influence of tetraethoxysilane sol preparation on the electrospinning of silica nanofibers

Geltmeyer

Roo

Broeck

et al. 2015

J Sol-Gel Sci Technol

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“…A similar phenomenon was found in the synthesis of silica particles by the Stöber method. Upon decreasing the molecular weight of the alcohol solvent, the size of the silica particles also decreased …”

Section: Resultsmentioning

confidence: 98%

“…Upon decreasingt he molecular weight of the alcohol solvent, the size of the silica particles also decreased. [49,50] Spherical core-shell PS-Au@Si particles can be obtained by seed-mediated synthesis and by increasing the amount of TEOS (see Figure 3). The preparation procedure is described in the Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

Polystyrene‐Core–Silica‐Shell Hybrid Particles Containing Gold and Magnetic Nanoparticles

Tian

Vana

2016

Chemistry An Asian Journal

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Polystyrene-core-silica-shell hybrid particles were synthesized by combining the self-assembly of nanoparticles and the polymer with a silica coating strategy. The core-shell hybrid particles are composed of gold-nanoparticle-decorated polystyrene (PS-AuNP) colloids as the core and silica particles as the shell. PS-AuNP colloids were generated by the self-assembly of the PS-grafted AuNPs. The silica coating improved the thermal stability and dispersibility of the AuNPs. By removing the "free" PS of the core, hollow particles with a hydrophobic cage having a AuNP corona and an inert silica shell were obtained. Also, Fe3O4 nanoparticles were encapsulated in the core, which resulted in magnetic core-shell hybrid particles by the same strategy. These particles have potential applications in biomolecular separation and high-temperature catalysis and as nanoreactors.

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“…(I). The acid-catalytic hydrolysis of TEOS is a proton electric mechanism; its hydrolysis of all ethoxy groups is selective (Malay et al 2013). Once one ethoxy group hydrolyzed, the ethylene oxide hydrolysis rate of the others was relatively slow.…”

Section: Effect Of Silica On the Structure Of Plcfmmentioning

confidence: 99%

Studies of Polyvinyl Alcohol/Alkali Lignin/Silica Composite Foam Material (PLCFM)

Luo¹,

Lü²,

Ren³

et al. 2015

BioResources

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This study investigates methods for improving the heat resistance of polyvinyl alcohol/alkali lignin foam material (PLFM). Tetraethoxysilane (TEOS) was used as a precursor to prepare PLCFM by a sol-gel method. The PLCFM, prepared with different levels of TEOS, was characterized by Fourier Transform Infrared spectrometry (FTIR), Differential Scanning Calorimetry (DSC), and Thermogravimetric Analysis (TGA). The results indicated that the addition of silica notably improved the heat resistance properties and the initial decomposition temperature of the foam and exhibited good biocompatibility with the polyvinyl alcohol (PVOH) and alkali lignin. The melting temperature of the PLCFM also increased significantly. It reached 268 °C when the silica content was 10%, which was 110 °C higher than that of PLFM. The mechanical properties were also improved to 27.42 MPa.

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Effects of solvent on TEOS hydrolysis kinetics and silica particle size under basic conditions

Cited by 59 publications

References 32 publications

The influence of tetraethoxysilane sol preparation on the electrospinning of silica nanofibers

The influence of tetraethoxysilane sol preparation on the electrospinning of silica nanofibers

Polystyrene‐Core–Silica‐Shell Hybrid Particles Containing Gold and Magnetic Nanoparticles

Studies of Polyvinyl Alcohol/Alkali Lignin/Silica Composite Foam Material (PLCFM)

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