Synthesis and growth of nanotubes Mg3Si2O5(OH,F)4 composition under hydrothermal conditions

Abstract

Nanotubes of magnesium hydrosilicate Mg3Si2O5 (OH, F)4 having the structure of chrysotile and increased thermostability in comparison with hydroxyl-chrysotile were synthesized under hydrothermal conditions at temperatures of 300–450°C and pressure of 30–100 MPa from mixtures of oxides of magnesium and silicon with the use NaF and NaOH as mineralizers. The conditions of the synthesis of the chrysotile nanotubes with varying content of fluorine (0.4–4.0 wt %) in the composition of chrysotile were determinated. The effect of the physical-chemical parameters of the synthesis on the growth of the OH-F-chrysotile tubes was tracked. The core role of concentration of F-containing mineralizer was shown.