Microwave-assisted synthesis of spherical monodispersed magnesium fluoride

The Effects of Various Parameters of the Microwave-Assisted Solvothermal Synthesis on the Specific Surface Area and Catalytic Performance of MgF2 Nanoparticles

High-specific-surface-area MgF₂ was prepared by microwave-assisted solvothermal synthesis. The influences of the solvent and the magnesium precursors, and the calcination atmospheres, on the nanoparticle sizes and specific surface areas, estimated by X-Ray Powder Diffraction, N₂ sorption and TEM analyses, were investigated. Nanocrystallized (~7 nm) magnesium partially hydroxylated fluorides (MgF_2−x(OH)_x) with significant specific surface areas between 290 and 330 m²∙g⁻¹ were obtained. After activation under gaseous HF, MgF_2−x(OH)_x catalysts underwent a large decrease of both their surface area and their hydroxide, rates as shown by their ¹⁹F and ¹H solid-state NMR spectra. Expect for MgF₂ prepared from the acetate precursor, an activity of 30–32 mmol/h∙g was obtained which was about 40% higher compared with that of MgF₂ prepared using Trifluoroacetate method (21.6 mmol/h∙g).

Sub-nano MgF2 embedded in carbon nanofibers and electrospun MgF2 nanofibers by one-step electrospinning as highly efficient catalysts for 1,1,1-trifluoroethane dehydrofluorination

MgF₂ embedded in carbon fibers and electrospun MgF₂ fibers prevent sintering and are reactive.

Optimisation of a sol–gel synthesis route for the preparation of MgF2 particles for a large scale coating process

Preparation of transparent and low viscous MgF₂ sols via sol–gel technique which can be applied for antireflective coatings on glass substrates is described.

Nanometer to submicrometer magnesium fluoride particles with controllable morphology

Magnesium fluoride particles with controllable size (from several nanometers to submicrometers) and morphology (spherical and cubic forms) were successfully prepared via liquid-phase synthesis. The particles were synthesized from the reaction of MgCl(2) and NH(4)F in an aqueous solution at 75 degrees C for 1 h under a nitrogen atmosphere. Control of particle size was accomplished mainly by changing the concentration of the reactants, which could be qualitatively explained by conventional nucleation theory. Flexibility of the process in controlling particle morphology, from a spherical to a cubical form, was predominantly achieved by varying the concentration of MgCl(2). Since the same XRD pattern was detected in particles with varying morphologies, the shape transformation was due to changes in particle growth. With the ability to control particle size and morphology, the creation of other inorganic particles is possible and has potential for many field applications.