Kinetics of Ice Nucleation Confined in Nanoporous Alumina
Autor(en): | Suzuki, Yasuhito Steinhart, Martin Butt, Hans-Juergen Floudas, George |
Stichwörter: | ARRAYS; Chemistry; Chemistry, Physical; CUBIC ICE; DYNAMICS; HOMOGENEOUS CRYSTALLIZATION; NEUTRON-DIFFRACTION; STATE; SUPPRESSION; TEMPERATURE; WATER | Erscheinungsdatum: | 2015 | Herausgeber: | AMER CHEMICAL SOC | Journal: | JOURNAL OF PHYSICAL CHEMISTRY B | Volumen: | 119 | Ausgabe: | 35 | Startseite: | 11960 | Seitenende: | 11966 | Zusammenfassung: | The nucleation mechanism of water (heterogeneous/homogeneous) can be regulated by confinement within nanoporous alumina. The kinetics of ice nucleation is studied in confinement by employing dielectric permittivity as a probe. Both heterogeneous and homogeneous nucleation, obtained at low and high undercooling, respectively, are stochastic in nature. The temperature interval of metastability extends over similar to 4 and 0.4 degrees C for heterogeneous and homogeneous nucleation, respectively. Nucleation within a pore is spread to all pores in the template. We have examined a possible coupling of all pores through a heat wave and a sound wave, with the latter being a more realistic scenario. In addition, dielectric spectroscopy indicates that prior to crystallization undercooledwater molecules relax with an activation energy of similar to 50 kJ/mol, and this process acts as precursor to ice nucleation. |
ISSN: | 15206106 | DOI: | 10.1021/acs.jpcb.5b06295 |
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