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 transition or crystallization but are related to a first-order-like liquid-liquid transition.

De Michele V., Levantino M., Cupane A. (2019). Hysteresis in the temperature dependence of the IR bending vibration of deeply cooled confined water. THE JOURNAL OF CHEMICAL PHYSICS, 150(22), 224509-1-224509-8 [10.1063/1.5096988].

Hysteresis in the temperature dependence of the IR bending vibration of deeply cooled confined water

Cupane A.
;
LEVANTINO, Matteo
2019-01-01

Abstract

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 transition or crystallization but are related to a first-order-like liquid-liquid transition.
2019
Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin)
De Michele V., Levantino M., Cupane A. (2019). Hysteresis in the temperature dependence of the IR bending vibration of deeply cooled confined water. THE JOURNAL OF CHEMICAL PHYSICS, 150(22), 224509-1-224509-8 [10.1063/1.5096988].
File in questo prodotto:
File Dimensione Formato  
De Michele et al., J.Chem.Phys_2019.pdf

Solo gestori archvio

Descrizione: Articolo principale
Tipologia: Versione Editoriale
Dimensione 2.56 MB
Formato Adobe PDF
2.56 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
copyright_e_form_jcp19-ar-sch2o2019-00773r_cupane_efcpxj.pdf

Solo gestori archvio

Tipologia: Contratto con l'editore (ATTENZIONE: NON TRASFERIRE A SITO DOCENTE)
Dimensione 593.08 kB
Formato Adobe PDF
593.08 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/365800
Citazioni
  • ???jsp.display-item.citation.pmc??? 2
  • Scopus 5
  • ???jsp.display-item.citation.isi??? 4
social impact