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Synthesis and Characterization of Borate Nanomaterials

Author: QinShaoHua
Tutor: ShaoWenZhu
School: Harbin Institute of Technology
Course: Materials Science
Keywords: Nanomaterials Borate Hydrothermal Synthesis Sol-gel
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 49
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Abstract


Borate, boric acid magnesium and aluminum borate nano-materials with high strength, good chemical stability and low coefficient of thermal expansion in recent years, concern. From synthetic methods for the synthesis of these two materials is mainly solid-phase method, a liquid phase method less. In this paper, hydrothermal and sol-gel method was successfully synthesized magnesium borate and boric acid aluminum nano-materials, synthetic borate nanomaterials morphology and structure were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, the influence of process parameters on the product phase and morphology. MgCl 2 · 6H 2 O and the NaBH 4 as raw materials, hydrothermal method to control the process conditions, synthesized with different morphologies MgBO 2 (OH) nano-materials, such as microspheres / nanobelts / nanowires. Of MgBO 2 (OH) microspheres with a diameter 80 1 00nm nanowires with a diameter of 2-5 microns; MgBO 2 ( OH) nano with a width of 20 1 00nm, length of about a few microns to tens of microns; MgBO 2 (OH) nanowires for 30 1 00nm, length about a few microns. Obtained by high-temperature calcination in the synthetic MgBO 2 (OH) nanomaterials based on Mg 2 B 2 O 5 nanomaterials, morphology can be better maintained. The Mg 2 of B 2 O 5 microspheres of a diameter of about 2 4 micron; Mg 2 < / sub> B 2 O 5 nano band width from tens to hundreds of nanometers in length from a few microns to tens of microns; Mg 2 B 2 O 5 nanowires tens of nanometers in diameter, the length between a few hundred nanometers to several microns. Auxiliary of the active agent citric acid, Al (NO 3 ) 3 · 9H 2 O and H , 3 BO 3 the colloidal precipitates as raw material, first obtained by the sol-gel method, and then the precipitate high-temperature calcination Al 4 B 2 O < the B 4 O 33 of Sub> 9 nano-rods and Al of 18 nano-particles. When H 3 BO 3 and Al the (NO 3 ) 3 · 9H 2 O molar ratio, at 1050 oC temperature calcination, the resulting product as Al 18 B 4 O 33 nanoparticles, and Al 18 B 4 O 33 nano-particles exist in the form of short prism, the edges are in the hundreds of nanometers; When the mole is relatively high, 1050 oC temperature calcination, the resulting product is Al 4 B 2 O 9 nanorods and Al 4 B 2 O 9 nanorods diameter of 200 3 00nm, the length of a few hundred nanometers to a few microns. The study showed that the higher the calcination temperature, the longer the holding time, the Al 4 the B 2 the O 9 nanorods and Al of 18 B 4 O 33 nano-particle morphology more uniform; addition, the active agent of citric acid play the role of the uniform morphology of the product.

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