Effect of Surfactants on the Structure and Morphology of Magnesium Borate Hydroxide Nanowhiskers Synthesized by Hydrothermal Route

Abstract

Magnesium borate hydroxide (MBH) nanowhiskers were synthesized using a one step hydrothermal process with different surfactants. The effect surfactants have on the structure and morphology of the MBH nanowhiskers has been investigated. The X-ray diffraction profile confirms that the as-synthesized material is of single phase, monoclinic MgBO2(OH). The variations in the size and shape of the different MBH nanowhiskers have been discussed based on the surface morphology analysis. The annealing of MBH nanowhiskers at 500 °C for 4 h has significant effect on the crystal structure and surface morphology. The UV–vis absorption spectra of the MBH nanowhiskers synthesized with and without surfactants show enhanced absorption in the low-wavelength region, and their optical band gaps were estimated from the optical band edge plots. The photoluminescence spectra of the MBH nanowhiskers produced with and without surfactants show broad emission band with the peak maximum at around 400 nm, which confirms the dominant contribution from the surface defect states.

The Synthesis and Physical Properties of Magnesium Borate Mineral of Admontite Synthesized from Sodium Borates

“…Also, the electrical conductivity of the magnesium borate compounds was determined in the range of 10 −7 -10 −8 (Ω m) −1 with the content of pure admontite minerals yields in the range of 85-94%. Resistivity measurement of bulk magnesium borate has not been studied and conductivity of magnesium borate nanowires is calculated to be about 10 −4 (Ω m) −1 in literature [16]; the wide difference in the conductivity of the magnesium borate obtained by Li et al and the present study comes from the content of structural water inside the magnesium borates, where in this study MgO(B The energy band gaps of admontite and calcined admontite were determined to be about 4.77 eV and 4.13 eV, respectively, where in literature Kumari et al [3] calculated the energy band gap of magnesium borate to be 4.72 eV, which is in mutual agreement with the obtained energy gap values.…”

“…Magnesium borates are considerable borate minerals by virtue of their high heat resistance, light weight, high elasticity coefficient, birefringent crystal structure, anticorrosion, and antiwear properties [1][2][3][4]. Owing to these properties, magnesium borates have extensive usage area and application potentials.…”

Novel Hydrothermal Synthesis of Pure and Doped Ammonium and Potassium Titanyl Phosphates using a Green Heterogeneous Reaction

“…Similarly, the use of surfactants or other capping agents in the synthetic process could allow for the production of finer platelets with higher surface area. 11 Other materials of technological significance could be synthesised using greener reagents and under the milder conditions as we have demonstrated here with appropriate adaption of existing synthetic methodologies. Figure 1 Scanning electron microscopy was conducted using a, FEI Quanta 200 SEM equipped with an EDAX Sapphire microanalyser.…”

Synthesis of Diatomite-Based Mesoporous Wool-Ball-Like Microspheres and Their Application for Toluene Total Oxidation Reaction

“…The morphology and porosity of the final material can be controlled by varying the type and concentration of surfactant and by controlling the organization of the final assembly. Among the various surfactants, cetyltrimethylammonium bromide (CTAB) has been most widely employed [13,[16][17][18].…”