Calcium silicate phosphors obtained by the sol-gel method

Khristov, Ts. I.; Popovich, N. V.; Galaktionov, S. S.; Soshchin, N. P.

doi:10.1007/bf00679827

Cited by 7 publications

(4 citation statements)

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“…3) take place at 830 ~ (ES and WS), 870 ~ (FS) and 920~ (RS), which is 30-80~ lower (except RS) in comparison with the results found for stoichiometrically similar systems prepared using alkoxide precursors [10][11][12]. In Table 1 Temperature (oC)…”

Section: Resultsmentioning

confidence: 53%

An organic-inorganic silica precursor suitable for the sol-gel synthesis in aqueous media

Maliavski

Душкин

Tchekounova

et al. 1997

J Sol-Gel Sci Technol

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Abstract. Partially polycondensed y-aminopropylsilanetriol (APSTOL) was prepared by hydrolyzing y-aminopropyltriethoxysilane at a hydrolysis ratio 8.0. APSTOL contains up to 52% SiO2 and can be easily dissolved in water, forming clear solutions remaining stable practically at any pH value. The thermal evolution of APSTOL when heating up to 1000~ was examined using TGA and FTIR techniques; the probable mechanism of the oxidative decomposition of organic groups, with the formation of imino-and carboxyl-containing intermediates, has been discussed. Two magnesium silicates of the enstatite and forsterite compositions and two calcium silicates of the wollastonite and rankinite compositions have been prepared, using corresponding acetates and APSTOL as MUo and SiO2 precursors. The crystallization processes in these systems were studied by TGA and XRD techniques, after heat treatments up to 1000~ In all the systems, except rankinite, the parent silicates were found as the main crystalline phases.

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Section: Resultsmentioning

confidence: 53%

An organic-inorganic silica precursor suitable for the sol-gel synthesis in aqueous media

Maliavski

Душкин

Tchekounova

et al. 1997

J Sol-Gel Sci Technol

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“…Calcium silicate has received significant attention because of their potential applications as host of phosphors and ceramic insulators [1][2][3]. Nanosized calcium silicate material has been studied over the past years because of their significant properties which are different from their bigger sizes.…”

Section: Introductionmentioning

confidence: 99%

“…It is also prepared by the chemical methods such as combustion, sol-gel, co-precipitation, etc. routes followed by heat treatment at various temperatures [3][4][5]. All these methods are limited by some of their inherent disadvantages, for example, requirement of high temperature, long processing time, low yield or hazardous to health and environment.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Synthesis of Nano Calcium Silicate Particles at Room Temperature

Singh¹,

Karmakar²

2011

NJGC

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Nano-sized calcium silicate powders were synthesized at room temperature by the new mechanochemical method using a high energy planetary ball mill. The formation of calcium silicate from its raw materials (calcium carbonate and dehydrated silica gel) was monitored by the XRD analysis with progression of ball milling. It is observed that the synthetic process comes to an end through the following three sequential stages: comminution of raw materials, recombination of comminuted raw materials to final product, and comminution of final product to smaller sizes. The nanostructure of the synthesized powder was realized by the FESEM photomicrograph, TEM image and XRD analyses. These analytical observations have revealed that the nano-sized polycrystalline calcium silicate particles are formed after about 6 h of ball milling and they are spheroidal in shape. The average particle size of the as-generated calcium silicate nanocrystalline powders is found to be around 21 nm which decreases with increasing ball milling but increases with annealing at elevated temperature

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“…Calcium silicate (CaSiO 3 ) has been used in manufacture of ceramic insulators and as host of phosphors, but its investigation in biodiesel synthesis is not widely appreciable). Generally, it is prepared by solid state method, in which limestone (CaCO 3 ) or CaO reacts with quartz (SiO 2 ) at approximately 1150–1200 °C for 10 .…”

Section: Transesterification Procedures Using Silicates Catalystsmentioning

confidence: 99%

Investigation of silicates as a catalyst in biodiesel production: A review

Shimi

Attia

Diwani

et al. 2016

Int. J. Energy Res.

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Summary Hiking of crude oil prices and diesel fuel shortage is incentive for the researchers to develop bioenergy sources. Biodiesel has environmental beneficial attributes, and its production processes are worthy of continued studies. Many biodiesel production processes are available but, most of them are not on a commercial scale. Biodiesel production using solid catalysts involved fewer unit operations compared with homogeneous catalyzed processes. Many heterogeneous catalysts have been extensively investigated in the recent years and well established. Researchers' focus is how to obtain active and more stable silicates catalyst that can be recycled for several times in the process. Silicates catalyst activity and stability are critically discussed in this work to assess their industrial application, as excessive purification steps could be avoided. This review provides a brief overview on semi‐novel heterogeneous catalyst types ‘silicates’ used in the transesterification of vegetable oils for biodiesel production. Process conditions and leaching out of catalyst active sites are also highlighted. Product quality analysis is presented, in addition to concluded remarks regarding silicates as a selected catalyst. A preliminary economic assessment of biodiesel production catalyzed by the suggested catalyst ‘silicates’ compared with potassium hydroxide (KOH) and lime (CaO) is performed. Copyright © 2016 John Wiley & Sons, Ltd.

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Calcium silicate phosphors obtained by the sol-gel method

Cited by 7 publications

References 1 publication

An organic-inorganic silica precursor suitable for the sol-gel synthesis in aqueous media

An organic-inorganic silica precursor suitable for the sol-gel synthesis in aqueous media

Mechanochemical Synthesis of Nano Calcium Silicate Particles at Room Temperature

Investigation of silicates as a catalyst in biodiesel production: A review

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