ao7b01994_si_001.pdf (760.4 kB)
One-Step Synthesis of Calcium Sulfate Hemihydrate Nanofibers from Calcite at Room Temperature
journal contribution
posted on 2018-03-08, 19:14 authored by Satoru Fukugaichi, Naoto MatsueIn recent years,
researchers have made significant progress in
the development of inorganic nanofibers (including nanowires). Typically,
inorganic nanofibers are synthesized via crystal growth in solution;
however, a limited number of studies have focused on their preparation
directly from solid raw materials (with no examples of synthesis conducted
at room temperature and atmospheric pressure). In this work, we successfully
synthesized nanofibers of calcium sulfate hemihydrate (bassanite,
CaSO4·0.5H2O) at 20 °C and 1 atm by
mixing calcite and dilute sulfuric acid in methanol. The bassanite
nanofibers are concluded to be synthesized by the formation of calcium
sulfate on the calcite surface and its simultaneous reaction with
the generated H2O. Because bassanite exhibits useful physical
properties that include high mechanical strength, high thermal stability,
and excellent chemical stability, its nanofibers can be widely applied
to rubber, plastics, antifriction materials, and paper as a strengthening
agent, for heat-resistance, or as a flame retardant, or for creep
resistance.