1. Introduction. A number of porous materials based on silica and alumina are available industrially and largely applied by the chemical industry as heterogeneous catalysts, supports or components of heterogeneous catalysts (Busca, 2014a), as well as adsorbents for fluid mixtures purifications or separations (Yang, 2003), as well as ion …
These wastes can be used to prepare homogenous silica nanoparticles. Here we review properties, preparation and applications of silica nanoparticles. Preparation includes chemical and biomass methods.
[2] Li X. and Du FL. 2014 Effect of Surfactants on Spherical Silica Preparation Journal of Qingdao University of Science and Technology(Natural Science Edition) 35 141-145. Google Scholar [3] Chu GN, Lu XB and Feng JW 2019 The Application of a Hemispherical Silica Powder in Cosmetics China Cleaning Industry 10 93-97. …
In this study, nanosilica particles were prepared from self-made silica gel under the protection of citric acid in situ complexation and ethyl acetate as the latent acid reagent. The effects of ethyl acetate, citric acid, reaction temperature, and reaction time on the particle size of nanosilica were studied. The optimum process parameters were …
Silica aerogel is the archetypal thermal superinsulator and commonly applied to improve the thermal performance of on- and off-shore industrial infrastructure and buildings. Hitherto, the main products on the market are silica aerogel based blankets fabricated by casting a silica sol into a porous or fiber matrix, followed by gelation, …
Silica nanoparticles were prepared from tetraethylortho-silicate (TEOS) dissolved in ethanol by using a semi-batch process in order to control the particle …
The applications of silica-aluminas in industrial catalytic processes are briefly reviewed. The literature data on the surface chemistry and structural chemistry of silica-aluminas are summarized. ... The cheapest precursors for the industrial preparation are sodium silicate (water glass) and sodium aluminate. However, the sodium content in …
This study aims to recycle industrial silica-alumina gel waste for the low-temperature massive preparation of high-quality mullite whiskers. In this work, Na 2 SO 4 and AlF 3 ·3H 2 O were used as the molten salt and crystallization catalyst, respectively, and industrial silica-alumina gel waste and Al 2 (SO 4 ) 3 ·18H 2 O were used as the ...
The sol-gel process, a frequently used technique for the preparation of SNPs, involves the development of networks through an arrangement of colloidal …
The synthesis of silica using this method, lead to silica precipitation under certain conditions like restriction of gel growth that involved coagulation and precipitation step during its ...
PEG-grafted silica particles were characterized by FT-IR spectroscopy to confirm the introduction of PEG onto silica surface. Fig. 4 shows the FT-IR spectra of (a) PEG-grafted silica particles from TEOS and PEGME–IPTES and (b) bared silica particles from TEOS. The peak for a urethane carbonyl group of a PEG-grafted silica particle …
An economical and environmentally benign method is proposed for the preparation of silica nanoparticles by hydrolysis of silicon tetrachloride vapor with water vapor at a low temperature (similar ...
Silica aerogel composites with embedded fibres: a review on their preparation, properties and applications. Journal of Materials Chemistry A 2019, 7 (40), 22768-22802.
Here we present a direct ink writing protocol to create miniaturized silica aerogel objects from a slurry of silica aerogel powder in a dilute silica nanoparticle suspension (sol).
The formation process of stable colloidal silica solution was discussed in this article. The affecting parameter including pH, zeta potential, and colloidal concentration …
Silica (SiO2), a component of the earth's crust, has been in use for many nanotechnological applications. This review presents one of the newest methods for …
On the other hand, silica purities of 99.6% and 99.5% were obtained using sulfuric acid and the ionic liquid, 1-butyl-3-methylimidazolium hydrogen sulfate, respectively. This indicates that both chemicals are useful for removing metallic impurities and result in an improved purity of silica.
Preparation of silica aerogels with low cost materials and drying condition has attracted great attention in the past years [21], [22], [23]. Industrial by-products rich in silica such as fly ash, rice husk ash and used bagasse ashes are proven to have great potential as raw material for preparing silica aerogels [24], [25], [26]. However ...
Silica is a main component of cordierite ceramic, in the present work, industrial solid waste was used as main silica source to prepare porous planar cordierite membranes by a solid-phase sintering process with starch as pore-forming agent.
The sol–gel chemistry of silica has long been used for manipulating the size, shape, and microstructure of mesoporous silica particles. This manipulation is performed in mild conditions through controlling the hydrolysis and condensation of silicon alkoxide. Compared to amorphous silica particles, the preparation of mesoporous …
In this study, we introduce the preparation of silica nanoparticles using a combination method that involves a simple, …
Developing more sustainable and economical viable strategies to access high value-added products from alternative and less costly sources is currently a challenge in the chemical industry. Silica is among the most used chemicals and is widely used in many industrial applications such as toothpastes as a cleansing agent, rubber industry …
The silica aerogels were prepared via a sol-gel technique and ambient pressure drying by using industrial solid wastes, dislodged sludges, as raw materials. A strategy was put forward to reduce the corrosion of equipment during the drying procedure. The pore structure, hydrophobicity, and thermal insulation property of the obtained …
Abstract Monodisperse silica particles were fabricated by seed synthesis and growth using two-phase synthesis methods and additional growth methods based on the Stöber process. The particle …
It discusses properties and methods of characterization, synthesis, and preparation of silica in terms of industrial applications. Following an analysis of the …
The silica/PDBIIG nanocomposite was prepared without adding silane coupling agents. The ring-opening reaction, which occurred between the hydroxyl groups on the silica surfaces and the epoxy groups of the PDBIIG chains during mixing and vulcanization, was confirmed via bound rubber tests and Fourier transform infrared spectroscopy.
The silica prepared from WSS may be used in future applications of nanotechnology. In the meantime, SiC recycled from WSS can be used as abrasive again. The process is inexpensive and suitable for large-scale production. If this route comes true in industry, it will generate positive influence on resource conservation and …
Different temperatures, gas exposures, and modes of drying can make a large difference in particle formation, as evidenced by the preparation of uniform cobalt on silica particles by using fluid bed drying at 100°C in a nitrogen rather than air flow . These approaches, which have been led by de Jong, de Jongh, and their co-workers are also ...
Colloidal silica is used in many applications including catalysis, pharmaceuticals, and coatings. Although naturally formed silica materials are widely available, they are often in forms that are difficult to process or are even harmful to health. Therefore, uniform colloidal silicas are generally manufactured using synthetic chemical …
erties. (part 1). Most industrial silica is made from natural sources. Quartz and quartzite are the most stable and pure polymorphs of silica found in almost all mineralogical rocks. ... Methods for the Preparation of Silica and Its Nanoparticles from Dierent Natural Sources 5873 1 3 Conradt et al. also used the reflux boiling in 2.4 mol/l HCl ...
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