On the problem of the existence of a supercooled liquid phase of cryovacuum ethanol condensates

Abstract

Our previous IR-spectrometry and thermodesorption studies of thin films of cryovacuum ethanol condensates and comparison of these data with the results obtained in works of some groups have allowed us to make several conclusions relative to temperature ranges of existence of low-temperature states of ethanol. Newly acquired experimental data indicate that the cryovacuum condensates of ethanol formed at temperatures considerably below the glass transition temperatureT g ≈ 98 K pass through the state that can be characterized as a supercooled liquid phase in the course of subsequent thermally stimulated transformations. The temperature range of the solid-liquid transformation (97–100 K) agrees well with the data of researchers who studied the ethanol samples obtained by the vitrification from the liquid phase. The study was conducted at low temperature in a universal IR research – spetrofotometre. Treated samples when the temperature changes from 16K to 120K. When cryocondensation gas pressure on mercury was P = 5 × 10-5 mm.Hg. Spktra infrared range was from 400 cm-1 to 4200 cm-1.