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" Glassy nuclei in amorphous ice : "
Christina Maria Tonauer.
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BL
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| Record Number
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882154
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| Main Entry
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Tonauer, Christina Maria
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| Title & Author
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Glassy nuclei in amorphous ice : : novel evidence for the two-liquids nature of water /\ Christina Maria Tonauer.
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| Publication Statement
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Wiesbaden :: Springer Spektrum,, 2019.
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| Series Statement
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BestMasters,
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| Page. NO
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1 online resource (xiii, 76 pages) :: illustrations (some color)
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| ISBN
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3658263245
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: 9783658263249
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3658263237
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9783658263232
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| Contents
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Intro; Dank; Contents; List of Figures; List of Tables; 1 Introduction; 1.1 Water, a truly anomalous substance; 1.2 State diagram of water; 1.2.1 Crystalline Phases; 1.2.1.1 Ice I: Hexagonal ice Ih, cubic ice Ic and stacking-disordered ice Isd; 1.2.1.2 Ices II, V, IX; 1.2.2 Amorphous states of ice; 1.2.2.1 Low-density amorphous ice (LDA); 1.2.2.2 High-density amorphous ice (HDA); 1.2.2.3 Very high-density amorphous ice (VHDA); 1.3 Phase transitions; 1.3.1 Classification [122-124]; 1.3.2 Homogeneous nucleation [125, 126] and nuclei growth; 1.3.3 Discontinuous transition between LDA/HDA
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1.4 Glass transition [125, 138, 139]1.4.1 Glass transitions in water; 1.5 Theories aimed at explaining water's anomalies [47, 48]; 1.6 Experimental challenges -- Water's no-man's land; 1.7 Motivation for the present thesis; 2 Methods; 2.1 Dilatometry [166]; 2.1.1 Dilatometric setup [166, 167]; 2.1.2 Sample preparation [167]; 2.2.1 X-ray diffraction setup; 3 Experimental section [167]; 3.1 Preparation of eHDA; 3.1.1 Isothermal compression of hexagonal ice Ih → uHDA; 3.1.2 Preparation of VHDA via isobaric heating of uHDA; 3.1.3 Preparation of eHDA via isothermal decompression of VHDA
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3.2 Crystallisation experiments of eHDA3.2.1 Crystallisation of eHDA (first isobaric heating step); 3.2.2 Second isobaric heating step to Tmax and quench recovery; 3.3 Definition of crystallisation temperature Tx; 3.4 Apparatus correction; 3.5 Temperature correction; 3.6 Characterisation of crystallisation products; 3.7 Results of the volumetric crystallisation study of eHDA; 3.8 Results of XRD study of crystallisation products of eHDA; 3.9 Crystallisation / polymorphic transition studies of bulk LDA / Ih; 3.9.1 Preparation of bulk LDA and Ih samples
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3.9.2 Isobaric heating experiments of bulk LDA/ice Ih and XRD characterisation4 Discussion [167]; 4.1 Crystallisation of eHDA; 4.2 Comparison of phase transition in the bulk and in nanosized nuclei; 5 Summary [166]; References
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| Abstract
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Christina Maria Tonauer finds novel evidence for the first-order nature of the transition between high-density amorphous ice (HDA) and low-density amorphous ice (LDA), supporting water's liquid-liquid transition scenarios. Pressure-dependent crystallisation experiments of differently prepared expanded high-density amorphous ice samples (eHDA) and subsequent powder x-ray diffraction experiments disclose nucleation of LDA domains in bulk HDA, a typical feature of a first-order transition. The comparison of pressure-dependent crystallisation temperatures of eHDA samples with LDA nuclei and bulk LDA allows the estimation of the Laplace pressure and the size of a LDA nucleus. Contents Water's Polyamorphism High-Pressure in situ Volumetry and Powder X-Ray Diffraction Studies of Amorphous Ices Nucleation of Glassy Nuclei in High-Density Amorphous Ice Phase Transitions in Nanosized Amorphous Nuclei Target Groups University lecturers, students, and researchers (experimentalists and theoreticians) working in the field of water science, focusing on anomalies of cold and supercooled water Material scientists and engineers in the field of amorphous systems The Author Christina Maria Tonauer is currently a doctoral candidate at the Institute of Physical Chemistry at the University of Innsbruck, Austria. The focus of her scientific interests is on the physico-chemical characteristics and the reactivity of crystalline and amorphous water ices.
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Amorphous substances.
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Water.
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Amorphous substances.
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Water.
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| Dewey Classification
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546/.22
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| LC Classification
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QD169.W3
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