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The sol-gel process, a frequently used technique for the preparation of SNPs, involves the development of networks through an arrangement of colloidal …
Silica aerogel composites with embedded fibres: a review on their preparation, properties and applications. Journal of Materials Chemistry A 2019, 7 (40), 22768-22802.
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 …
The obtained silica aerogel/fiber-glass-mat composite has high thermal insulation, with a thermal conductivity of less than 0.020 W·m −1 ·K −1. The cost-effective process is promising for applications in the industrial preparation of silica aerogel thermal-insulating material.
Preparation of mesoporous silica materials: To study the influence of acid etching degree on the pore formation and structure of as-prepared samples, 5 g of the activated fly ash sample was weighed, and 50 mL of HCl solution with different concentrations (2.5%, 5%, 10%, 15%, 20% and 30%, respectively) was added, then …
The most documented method for the preparation of silica is the sol-gel route. In this process, Si (OH) 4 molecules condense to form a siloxane network. As a …
Silica aerogels have gained much interest due to their unique properties, such as being the lightest solid material, having small pore sizes, high porosity, and ultralow thermal conductivity. Also, the advancements in synthesis methods have enabled the creation of silica aerogel-based composites in combination with different materials, for …
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 …
The present study reveals a cost benefit process in an open system for utilizing desert sand for preparing sodium silicate or precipitated silica. A simple alkali fusion method has been developed to prepare sodium silicate directly from sand and finally pure precipitated silica by acid precipitation. The reaction weight ratio of alkali to sand …
Porous materials have promise as sound insulation, heat barrier, vibration attenuation, and catalysts. Most industrial solid wastes, such as tailings, coal gangue, and fly ash are rich in silicon. Additionally, a high silicon content waste is a potential raw material for the synthesis of silicon-based, multi-porous materials such as zeolites, mesoporous …
[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. …
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 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 ...
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 …
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 ...
In this study, we introduce the preparation of silica nanoparticles using a combination method that involves a simple, …
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 …
1940s it was in industrial production[3].China's silica industry started in the 1960s.The silica industry started late ... and techniques of the three silica preparation methods are now briefly described. III.I. Silica production by precipitation The precipitation process, also known as the "wet process", is based on quartz sand, industrial ...
The silica (Z175MP, with the specific surface of 134.63 m 2 /g and a mean particle size of 440 nm) was supplied by IDONG TECH.; silane coupling agent (Kettlitz-Silanogran Si69/GR) was supplied by Kangshin Industrial Co. Ltd.; aromatic oil (TDAE, dark brown, KUKDONG OIL & CHEMICAL CO. Ltd.) and maleic anhydride (MA) crystals (purity 99%, …
SEM images (Fig. 1) show the VTMS silica particles prepared by the simple one-step reaction in aqueous solution.VTMS silica is composed of many vinyl groups and showed uniform spherical shape with average diameter of about 1 μm.Using a VTMS silica particles as a substrate, it was possible to prepare the highly monodispersed …
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 …
Sol preparation is crucial as the desired properties of silica aerogel rely highly upon it. Different types of solvents, catalysts and precursors can be used to …
It discusses properties and methods of characterization, synthesis, and preparation of silica in terms of industrial applications. Following an analysis of the …
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 ...
Silica nanoparticles were prepared from tetraethylortho-silicate (TEOS) dissolved in ethanol by using a semi-batch process in order to control the particle …
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.
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 …
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.
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 …
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, …