As the most advanced aerogel material, silica aerogel has had transformative industrial impacts. However, the use of silica aerogel is currently limited to the field of thermal insulation materials, so it is urgent to expand its application into other fields. ... Preparation of Silica Aerogel/Resin Composites and Their Application in Dental ...
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Different mesoporous sizes of oxides, silica, alumina, titania, and zirconia were made by changing calcination temperature, and mixed catalysts, the mixtures of the oxides and microporous zeolite, were prepared. Conversions of n-dodecane using the β zeolite-mixed catalysts were much higher than those of the Y zeolite-mixed catalysts. Using the mixed …
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The biomimetic method and microemulsion methods of synthesis provide a superior level of surface chemistry and morphological control than …
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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 (∼150 °C). Analysis by X-ray fluorescence, X-ray diffraction, and scanning electron microscopy, and examination of nanoparticle size distribution, specific surface area, and pore …
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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 (presence of cracks and …
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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 …
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Preparation of hierarchical catalysts with the simultaneous generation of microporous zeolite using a template and large mesoporous silica by gel skeletal reinforcement and their reactivity in the catalytic cracking of n -dodecane. Catalysis Science & Technology 2019, 9 (14), 3614-3618. DOI: 10.1039/C9CY00693A.
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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 ...
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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.
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Monodispersed spherical silica nanoparticles were prepared by the hydrolysis of TEOS in a semi-batch reactor. A schematic design of a semi-batch process is depicted in Fig. 1.The apparatus consists of a reservoir of starting solutions, a micro feed pump to supply the solutions, a water bath, and a reactor with stirrer.
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attributes of silica aerogel to explore its potential applications. In conclusion, this paper provides an overview of the future potential and enhancement techniques for silica aerogel. 2. Preparation of silica aerogel Since its early publications in the 1930s, silica aerogel has played a significant role in both academia and industry.[8] The
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formation of silica particles dispersed in water to give hydrosols. The precursors were used to study the effect of solution pH and concentration on the morphology of silica particles during the drying process. The experimental flowchart of formation colloidal silica had shown in figure 1. …
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Preparation of mesoporous silica ceramics with relatively high strength from industrial wastes by low-toxic aqueous gel-casting Wei Wan a, Yongbao Fenga,b,∗, Jian Yanga,∗, Shuang Xua, Tai Qiua ...
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Silica aerogels have drawn considerable attention due to their low density (almost 95% of the total volume is composed of air), hydrophobicity, optical transparency, low conductivity of heat, and ...
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In this paper, molybdenum oxide catalyzed silica-alumina slag preparation of mullite whiskers was investigated, and the effects of different temperatures and molybdenum oxide additions on the growth of mullite whiskers were discussed. ... Industrial waste silica-alumina gel recycling: low-temperature synthesis of mullite whiskers for mass ...
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Silica aerogels have drawn a lot of interest both in science and technology because of their low bulk density (up to 95% of their volume is air), hydrophobicity, low thermal conductivity, high ...
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Preparation of Silica Powder from Rice Husk Ragini Patil1, Rajendra Dongre2 and Jyotsna Meshram3 ... Rice husk is a by-product of the rice milling industry. It is a unique crop residue with uniform size and high content of ash (14–25%). The silica content of the rice husk ash (RHA) can be as high as 90–98% [1]. ...
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Since the discovery of the ordered mesoporous material by the "Mobil Research and Development Corporation" many surfactants have been studied as structure-directing agents to synthesize novel mesoporous molecular sieves with well-defined pore size (2–10 nm) and high surface area [1], [2].The surfactant aggregates as self-assembled templates to develop new …
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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 determined as follows: Vethyl …
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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 safer, more afordable, and …
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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 environmental protection.
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Silica aerogels are gaining significant importance and have attracted considerable interest due to their extraordinary properties and numerous applications. Silica aerogels are highly porous with high surface area and very low density and thermal conductivity. Usually they are prepared and synthesized via sol-gel technique, which involves making a sol containing a …
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Request PDF | Preparation of Silica Powder from Low-Grade Quartz by Mechanical Activation Acid Leaching and Its Mechanism | Quartz is crucial in semiconductors and electronic packaging. Due to the ...
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Structured mesoporous silica was successfully synthesized using ion exchange resin as proton source to avoid the use of HCl during the synthesis and preventing the ions …
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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 model proposed here also justifies the possible preparation of acid catalyst by simple deposition of aluminum compounds over amorphous silica ...
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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 appeared at 1722 cm −1 and the …
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The non-crystalline nature of silica content in rice husk, which is converted to crystalline silica such as quartz, tridymite, and cristobalite on thermal treatment.
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4 . solutions of Na. 2SiO 3 are known to be alternative silica source s for the production of silica nanoparticles via the sol-gel synthetic process [14–16]. Commercial preparation of Na 2SiO 3 solutions is achieved by reacting SiO 2-containing material, such as quartz sand, with carbonates or sulphates of alkali metals at temperatures exceeding 1300ᵒC, with
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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 …
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A novel superoleophilic sponge, which has been prepared by a simple sol–gel process using microcrystalline cellulose (MCC) and methyl cellulose (MC), and its oil/water separation apparatus application are presented here. The samples were characterized by Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), Fourier Transform Infrared Spectra (FTIR), and so …
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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 as a reinforcing agent, …
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It is found recently that ionic liquids can improve dispersity of ZnO and crosslinking density (v c) and vulcanization rate of rubber [13], [14].It is also reported that dopamine can be used to modify silica for preparing natural rubber (NR) nanocomposites with reduced mission of VOCs [15], [16].The high prices of ionic liquids and dopamine limit their use in the rubber …
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Bulk mesoporous silica ceramics with homogeneous microstructure were prepared in this study using a low-toxic aqueous gel-casting method with industry waste as a raw material.
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such as hydrated alumina and silica minerals, the Chapter covers the impact of other constituents, suc h as titania, ... 4.5.8 Preparation of tricalcium aluminate hexahydrate.
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We propose a new approach to obtain monodisperse submicrometer- sized colloidal silica particles prepared via a modified Stöber synthesis method, leading to high- quality spherical …
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The precursor CuZn(OH) x (CO 3) y was synthesized by the reverse drop method. Firstly, 25.0 mmol of Zn(NO 3) 2 ·4H 2 O and 75.0 mmol of Cu(NO 3) 2 ·3H 2 O were accurately weighed and dissolved in 50 mL of distilled water. Additionally, 10.0 g of Na 2 CO 3 was dissolved in 200 mL of distilled water, while another 7.0 g of Na 2 CO 3 was dissolved in 50 mL of …
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Further, there are some reports available on preparation of silica gels using aluminosilicates, calcium silicates, wollestonite, ... Ambient pressure drying techniques will probably make industrial preparation much cheaper and will thus make aerogels more competitive. The most important area for the application of aerogels is in all kinds of ...
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Silica (SiO 2), a component of the earth's crust, has been in use for many nanotechnological applications. This review presents one of the newest methods for safer, …
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The extensive uses of silica nanoparticles in various industrial and domestic products have led to the development of silica extraction and purification processes from various agricultural residues.
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