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New method for sol-gel synthesis of orthosilicates Новый метод золь-гельсинтеза ортосиликатов
Orthosilicates of bivalent metals are widely employed by various technologies, including the production of building materials. In the last decades, several sol-gel methods were proposed to obtain high-purity orthosilicates in a laboratory environment. The objective of this research was to prepare powdered crystalline orthosilicates of calcium, magnesium, zinc and cadmium using a new sol-gel technique that comprises a hydrogel combustion stage.APSTOL (3-aminopropylsilanetriol), a water-soluble silicone having low polymerizability and high stability at any ambience, was used as a silica precursor. Metal nitrates were used as metal oxide precursors, water was the solvent. Nitric acid was added to every precursor mixture to prevent precipitation of metal hydroxides. Solid hydrogels, capable of spontaneous combustion, were generated in the aftermath of the dry-out of the prepared solutions. Combustion products were studied using FTIR method (Fourier transform infrared spectroscopy) and TG-DSC methods (Thermogravimetric Analysis and Differential Scanning Calorimetry), and heated thereafter. Final products were also studied using Fourier transform infrared spectroscopy.It was found that all combustion products (except for the Cd-silicate system) were poorly crystallized orthosilicates in stable or meta-stable crystalline forms. Upon subsequent heating, well-crystallized orthosilicates (willemite, larnite and forsterite) were formed.As a result, the proposed synthesis procedure demonstrated its efficiency for the synthesis of powdered crystalline or semicrystalline orthosilicates and oxy-orthosilicates of bivalent metals. The main strengths of this procedure include its high synthesis rate and absolute stability of the precursor solutions.
Для синтеза ортосиликатов кальция, магния, цинка и кадмия применена новая схема золь-гель синтеза, основанная на использовании водных растворов прекурсоров и включающая стадию сжигания гидрогеля. Судя по ИК-спектрам, частично закристаллизованные ортосиликаты образуются уже на стадии сжигания и полностью кристаллизуются в ходе дальнейшей термообработки до 1000 °С. Показана возможность получения этим методом смешанных оксо-ортосиликатов, в частности, трехкальциевого силиката.
New method for sol-gel synthesis of orthosilicates Новый метод золь-гельсинтеза ортосиликатов
Orthosilicates of bivalent metals are widely employed by various technologies, including the production of building materials. In the last decades, several sol-gel methods were proposed to obtain high-purity orthosilicates in a laboratory environment. The objective of this research was to prepare powdered crystalline orthosilicates of calcium, magnesium, zinc and cadmium using a new sol-gel technique that comprises a hydrogel combustion stage.APSTOL (3-aminopropylsilanetriol), a water-soluble silicone having low polymerizability and high stability at any ambience, was used as a silica precursor. Metal nitrates were used as metal oxide precursors, water was the solvent. Nitric acid was added to every precursor mixture to prevent precipitation of metal hydroxides. Solid hydrogels, capable of spontaneous combustion, were generated in the aftermath of the dry-out of the prepared solutions. Combustion products were studied using FTIR method (Fourier transform infrared spectroscopy) and TG-DSC methods (Thermogravimetric Analysis and Differential Scanning Calorimetry), and heated thereafter. Final products were also studied using Fourier transform infrared spectroscopy.It was found that all combustion products (except for the Cd-silicate system) were poorly crystallized orthosilicates in stable or meta-stable crystalline forms. Upon subsequent heating, well-crystallized orthosilicates (willemite, larnite and forsterite) were formed.As a result, the proposed synthesis procedure demonstrated its efficiency for the synthesis of powdered crystalline or semicrystalline orthosilicates and oxy-orthosilicates of bivalent metals. The main strengths of this procedure include its high synthesis rate and absolute stability of the precursor solutions.
Для синтеза ортосиликатов кальция, магния, цинка и кадмия применена новая схема золь-гель синтеза, основанная на использовании водных растворов прекурсоров и включающая стадию сжигания гидрогеля. Судя по ИК-спектрам, частично закристаллизованные ортосиликаты образуются уже на стадии сжигания и полностью кристаллизуются в ходе дальнейшей термообработки до 1000 °С. Показана возможность получения этим методом смешанных оксо-ортосиликатов, в частности, трехкальциевого силиката.
New method for sol-gel synthesis of orthosilicates Новый метод золь-гельсинтеза ортосиликатов
Malyavskiy Nikolay Ivanovich (author) / Zvereva Viktoriya Vladimirovna (author)
2013
Article (Journal)
Electronic Resource
Unknown
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