Search results for "Supercooled confined water"
showing 2 items of 2 documents
Hysteresis in the temperature dependence of the IR bending vibration of deeply cooled confined water.
2019
Using Fourier Transform Infrared (FTIR) spectroscopy, we investigate the temperature dependence of the bending vibrations of water confined in the pores of a silica hydrogel in the temperature interval of 270-180 K. We also investigate the presence of thermal hysteresis by cooling and reheating temperature scans. The results clearly show the presence, at about 230 K, of a crossover in the temperature dependence of the IR spectra; moreover, the presence of hysteresis is clearly demonstrated. By comparing FTIR data with neutron diffraction data and previous calorimetric data on the same samples, we conclude that the crossover and the hysteretical behavior do not involve a water glass transiti…
Kinetic energy and radial momentum distribution of hydrogen and oxygen atoms of water confined in silica hydrogel in the temperature interval 170–325…
2019
Water is an ubiquitous liquid and it is necessary for life;. Studies on water are therefore of obvious scientific and .... technological relevance. In view of its peculiar physicalproperties (the so-called water anomalies, particularly relevant at low temperatures [1]), studies on water structureand dynamics in ample temperature intervals, covering also the supercooling region, have attracted much interest in recent years. In particular, studies focused on the supercooled phase are important in order to test theories and hypotheses[2,3], including the liquid-liquid phase transition hypothesis [4-6] and the related fragile-to-strong crossover observed inwater confined in silica matrices and …