The formation process of stable colloidal silica solution was discussed in this article. The affecting parameter including pH, zeta potential, and colloidal concentration was investigated to elucidate the stability of colloid. Sodium silicate was used as the silica source. The colloidal silica prepared via sol-gel method at the base condition.

Synthesis of SiNPs from solid wastes is a remarkably good alternative for costly commercial silica precursors. Several agro-wastes such as rice husk, wheat husk, sugarcane bagasse and leaves, bamboo leaves, walnut shell, and orange peel, industrial wastes like fly ash, plastic wastes, and wastes from photonic industries have been …

The ability of a rapid supercritical extraction (RSCE) process implemented in an industrial hot press to produce silica aerogel monoliths (AMs) with properties suitable for use in fenestration products was investigated. The effects of hot-press processing parameters such as press force and heat-up and cool-down rates on the size (area) and quality …

Owing to their ultra-low thermal conductivity, silica aerogels are promising thermal insulators; however, their extensive application is limited by their high production cost. Thus, scientists have started to explore low-cost and easy preparation processes of silica aerogels. In this work, a low-cost method was proposed to prepare silica aerogels …

Sol preparation is the first stage of aerogel synthesis. In this stage, solution of various reactants undergoes hydrolysis and condensation reactions [].The reaction of a metal alkoxide (M–OR) with water forms a metal hydroxide (M–OH) as following: M–OR + H 2 O = M–OH + H–OR. In contrast, a condensation reaction occurs when two metal …

Article. Silica aerogels; a review of synthesis, applications and fabrication of hybrid composites. Published: 14 May 2021. Volume 28, pages 1387–1400, ( 2021 ) Cite …

The conventional academic method of silica aerogel preparation is sol-gel process using organic silicon compounds hydrolyser in the presence of an acid catalyst while industrial preparations start from "water glass" (Li et al. 2018). Additives may be added to modify gel porosity during aging.

The aim of this study is to reduce the manufacturing cost of a hydrophobic and heat-insulating silica aerogel and promote its industrial application in the field of …

Application of silica nanoparticles as fillers in the preparation of nanocomposite of polymers has drawn much attention, due to the increased demand for new materials with improved thermal, mechanical, physical, and chemical properties. Recent developments in the synthesis of monodispersed, narrow-size distribution of …

A novel and sustainable process to recycle an environmentally injurious material rich in silica—waste bagasse bottom ash from the sugar industry—into mesoporous pure silica of high purity is reported. Bagasse bottom ash (BBA) is a major byproduct of the sugar industry, with very inadequate recycling possibilities due to …

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 …

Abstract. Silica nanoparticles were prepared from tetraethylortho-silicate (TEOS) dissolved in ethanol by using a semi-batch process in order to control the …

@article{Li2016PreparationAP, title={Preparation and photocatalytic performance of magnetic Fe3O4@TiO2 core–shell microspheres supported by silica aerogels from industrial fly ash}, author={Zhen-duo Li and Huilong Wang and Xiao-Na Wei and Xiaoyu Liu and Yun Feng Yang and Wen-Feng Jiang}, journal={Journal of Alloys and …

Resin-based composites have attracted widespread attention in dental restoration because of their distinguished esthetics, biocompatibility, and convenient clinical manipulation. The particle size and the dispersity of inorganic filler are crucial. In this study, size-controlled monodisperse silica nanoparticles (MSNPs) from 20 to 330 nm were efficiently prepared …

Silica nanoparticles have received an intensive attention of scientific community due to its broad applications in industry. The optical properties of silica nanoparticles can be attained with respect to surface defect related to large surface/volume ratio according to the applications. ... Further, Wang and coworkers have reported …

Abstract. The production of amorphous mesoporous silica nanoparticles can be achieved using sodium silicate (Na 2 SiO 3) solutions prepared from South African coal fly ash waste.The first part of this study compared two processes for the preparation of Na 2 SiO 3 solutions. The first process, hereafter called sequential acid-alkaline leaching …

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. ... [25–28]. Particularly, the thermal approach to the preparation of bio-silica from biomass is relatively easy and cost-effective, and it also requires lesser ...

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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 ...

1. Introduction. Silica is one of the most studied material for the preparation of both mesoporous and microporous inorganic membranes. Silica membranes can be potentially applied in several industrial processes for efficient separations or for chemical synthesis in innovative membrane reactors (e.g., hydrogen production).

The central aim of this work is optimizing industrial-scale silica nanoparticle synthesis starting from sand and a case study of application as a plant stimulant in maize. 2. Results and Discussion. ... Unlike micro-emulsion-based methods often used to prep. luminescent silica particles, the Stoeber method is a one-pot synthesis that is carried ...

This study presents a robust and scalable method for synthesizing continuously the silica microspheres via the Stöber method. Owing to the superb mixing accessible with gas-liquid segmented flow in coiled microtube, satisfactory morphology and mono-dispersity of silica spheres was obtained. The continuous method was firstly …

Guo et al. successfully synthesized porous cordierite ceramics at 1350 °C for 5 h using silica and carbon in the rice husk as raw material and pore-forming agent, respectively [8]. Zeng et al. claimed that the industrial sludge released by aluminum factories is a promising kind of raw materials for cordierite ceramics [9].

The resultant silica aerogel has high hydrophobicity and a mesoporous structure with a pore volume exceeding 4.0 cm3·g−1 and a specific surface area exceeding 950 m2·g−1. 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.

Thiourea-containing silica gel hydrid materials (HO-SG-GPTS-TS and HE-SG-GPTS- TS) were prepared by homogeneous and heterogeneous methods for Hg(II) adsorption. Structures of HO-SG-GPTS-TS and HE-SG-GPTS-TS were confirmed by FTIR, 13C NMR, 29Si NMR, SEM, TGA, and porous structure analysis. Homogeneous preparation is …

Abstract. In this paper, spherical silica was prepared with tetraethyl orthosilicate (TEOS) as the silicon source and cetylpyridine bromide (CPB) as the template, the time and temperature of microwave digestion and the influence of urea content in the solution on the shape and particle size of silica were discussed, and the silica was ...

His research interests are resource utilization, and metallurgical physical chemistry. SU Bowen,SHI Gongchu,LIAO Yalong, et al. Research Progress on Functional Materials Preparation of Silica from Industrial Solid Wastes [J]. Materials Reports, 2021, 35 (3): 3026-3032. SUN Hongjuan, ZENG Li, PENG Tongjiang.

Many reports have reviewed the preparation of silica nanoparticles from pure organic chemicals (Wu et al. 2013a, b; Bleta et al. 2018; ... Sugarcane bagasse ash, a major by-product of the sugarcane industry, contains 40–50% of silica; acid pretreatment allows to increase amount of silica up to 80% (Ganesan et al. 2007; ...

This chapter discusses the preparation and properties of silica. Silica comprises a large class of products with the general formula SiO 2 or SiO 2.xH 2 O. Silica is a naturally occurring material in minerals, such as quartz and flint, and in plants, such as bamboo, rice and barley. Most of the silica used in chemical applications however, has a …