In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Effects of milling of starting hydrated aluminum sulfate on η → α phase transformation and sinterability of alumina, published in 1986-02-01, which mentions a compound: 17927-65-0, mainly applied to aluminum sulfate hydrate milling alumina; sintering alumina precursor milling; dehydration alumina precursor milling, HPLC of Formula: 17927-65-0.
The effects of milling of the precursor, Al2(SO4)3 (14-18)H2O, on η → α phase transformation and sinterability of α-Al2O3 were studied. Milling of the hydrated sulfate lowered the temperatures of dehydration, desulfation, and η → α phase transformation by about 30°, 20°, and 100°, resp. Dehydration of hydrated sulfate produced broken-eggshell-like anhydrous sulfate particles through melting of the hydrate in its water of crystallization On heating, the milled hydrated sulfate converted to anhydrous particles composed of finer sulfate particles. The anhydrous sulfate desulfated into aggregate grains of η-Al2O3 with an irregular pore size distribution. This η-Al2O3, finally formed skeletal grains of α-Al2O3 in which many cracks were produced. The optimum calcination temperature to prepare α-Al2O3 powder for sintering was lowered and the sinterability was improved by the milling treatment. The slope of Avrami-plots for η → α phase transformation indicated a 2-dimensional growth of α-Al2O3. The apparent activation energy for the transformation was 110 kcal/mol, which remained unchanged with milling. The enhancement of η → α phase transformation was due to accelerated nucleation in η-Al2O3 grains, and the sinterability of the α-Al2O3 was improved by an increase in the d. of green compacts, resulting from the occurrence of many cracks in the skeletal grains of α-Al2O3.
In some applications, this compound(17927-65-0)HPLC of Formula: 17927-65-0 is unique.If you want to know more details about this compound, you can contact with the author or consult more relevant literature.
Reference:
Isothiazole – Wikipedia,
Isothiazole – ScienceDirect.com