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Mechanics on Nano-assembly Material Containing TiO2（SnO2） Preparated by Melt-Phase Separation Process

Author: WangJingFu
Tutor: ZhangWenLi
School: Hebei University of Technology
Course: Materials Science
Keywords: phase-separation crystallization mechanics NMR XAFS
CLC: TB383.1
Type: Master's thesis
Year: 2008
Downloads: 35
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Abstract


Preparation of loaded TiO2（SnO2） nano-assembly material by melt-phase separation process is a new method which can combine the nano-material with the synthesis and assembly of nano-structure. The method’s reaction conditions is good and easy to operate, its process is simple and lost is lower, which will be important significance to industrialization production and application of nano-material. Nano-TiO2（SnO2） is main catalytic material and broad band semiconductor material too, and is widely used in environment purification and new energy, water treatment, etc.It has been done to study the mechanism of phase-separation and crystallization process of Na2O-B2O3-SiO2-TiO2 and Na2O（K2O）-CaO（MgO）-Al2O3-B2O3-SiO2-TiO2 glass system and the coordination change of correlation ion during the phase-separation and crystallization process, which were characterized with SEM, EDS, NMR, XAFS, etc.The results show that the coordination change of Ti-ion is earlier than structure of phase-separation at low treatment-temperature （500℃）, then comes into being pre-nuclear group with [TiO6], and the coordination of Ti-ion is close anatase with the higher heat-treatment temperature （580℃） and the phase-separation and anatase crystallization can be observed in Na2O-B2O3-SiO2-TiO2 system. In Na2O-CaO-Al2O3-B2O3-SiO2-TiO2 system, the coordination of B3+ is [BO4] and only a little [BO3] when the treat-temperature is low, and the [BO3] changes to [BO4] with the temperature increasing and Al3+ is [AlO4] in the rich Na2O-B2O3 phase and rich SiO2 phase, which turns to high coordination with higher temperature. During the phase-separation process, the glass structure of two phase changes evidently. When the treat-temperature is low, the structure of rich alkali-boron phase is formed by [BO4], a little [BO3] and part of [AlO4] and rich SiO2 phase composing of [SiO4], most [AlO4] and a lot of Na+. Along with treat temperature increasing, the structural network core ion of two phases is unconverted, but the remain [BO3] becomes changing to [BO4] and Na+ transfers to rich alkali-boron phase. In K2O-CaO（MgO）-Al2O3-B2O3-SiO2-TiO2 system, the structure of phase-separation is clear and its size is about 0.5um. In the case of low-temperature of phase-separation, rich SiO2 phase includes [SiO4], most [AlO4] and a lot of K+. While in the case of high-temperature of phase separation, CaO（MgO） still focuses in rich alkali-boron phase, but Na+ transfers to rich alkali-boron phase. In Na2O-B2O3-SiO2-SnO2 system, SnO2’s separation is due to proper Na2O and B2O3 and constitute pot above B abnormality line.

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