Papers by Keyword: Magnesium Borate

Abstract: In this paper, we report a simple strategy for fabricating mesoporous magnesium borate (2MgO·B₂O₃) microspheres. We employed sodium dodecyl sulfate (SDS) in one system, as a template for the controlled growth of mesoporous 2MgO·B₂O₃ microspheres. The products were characterized by XRD, SEM, TEM, EDS, N₂ sorption and FT-IR. SEM and TEM observations indicate magnesium borate products are composed of a large number of hollow microspheres, with diameters of 1.0~1.5 μm, which are in fact built from fibers with lengths of 100~150 nm. The N₂ sorption results show that the products have meso-structures. The average pore diameter is 27 nm. The BET surface area is about 53.03 m²/g, and the pore volume is 0.37 m³/g. It was found that SDS plays a key role for the formation of mesoporous structure. A possible mechanism was proposed to interpret the formation of the mesoporous structure. The mesopores will endow the hierarchical microspheres with novel application potentials.

Abstract: The organic-inorganic composite of oleic acid embedded layered magnesium borate was synthesized by low temperature hydrothermal method with magnesium chloride (MgCl₂•6H₂O), borax (Na₂B₄O₇•10H2O) as reactants, oleic acid as the embedded agent. The structure and morphologies of the synthesized samples were investigated by X-ray diffraction, N2 adsorption-desorption isotherms, scanning electron microscopy and Fourier transform infrared spectroscopy techniques. The results suggest that the structure of oleic acid embedded magnesium borate is layered-by-layered, and the interlayer spacing was about 6 nm. And the sizes of the lamellar magnesium borate are in the range of 100 nm to 200 nm. The average pore diameter of the prepared product is 22.4 nm. The BET surface area and pore volume are 50.31 m²/g and 0.275 m³/g, respectively. The molecular structure model of oleic acid embedded layered magnesium borate is established.

Abstract: Magnesium borate ball of wires, nanowires and petaliforms were prepared via calcination of magnesium borate hydroxide synthesized by hydrothermal route. Results of SEM characterization indicated that the morphology of magnesium borate hydroxide and magnesium borate could be talored via varying reaction temperature, reaction time and water's volume. And pure magnesium borate could be achieved when magnesium borate hydroxide was calcinated at 700°C.