Journal ArticleDOI
Freezing and melting of water in a single cylindrical pore: The pore-size dependence of freezing and melting behavior
Kunimitsu Morishige,Keiji Kawano +1 more
TLDR
In order to clarify the origin of the hysteresis between freezing and melting of pore water, this paper performed x-ray diffraction measurements of water confined inside the cylindrical pores of seven kinds of ordered mesoporous materials with different pore radii (1.2-2.9 nm).Abstract:
In order to clarify the origin of the hysteresis between freezing and melting of pore water, we performed x-ray diffraction measurements of water confined inside the cylindrical pores of seven kinds of siliceous MCM-41 (a member of ordered mesoporous materials denoted by Mobil Oil researchers) with different pore radii (1.2–2.9 nm) and the interconnected pores of Vycor glass as a function of temperature. The hysteresis effect depends markedly on the size of the cylindrical pores: the hysteresis is negligibly small in smaller pores and becomes remarkable in larger pores. This strongly suggests that the hysteresis is arisen from size-dependent supercooling of water confined to the mesopores. For the water confined to the mesopores with pore radius of 1.2 nm, a continuous transition between a liquid and a solid precedes the first-order freezing transition of the pore water which would occur by the same mechanism as in bulk water.read more
Citations
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Journal ArticleDOI
Phase separation in confined systems
TL;DR: A review of the current state of knowledge of phase separation and phase equilibria in porous materials can be found in this article, where the focus is on fundamental studies of simple fluids and well-characterized materials.
Journal ArticleDOI
Effects of confinement on freezing and melting.
Christiane Alba-Simionesco,Benoit Coasne,Gilberte Dosseh,G. Dudziak,Keith E. Gubbins,Ravi Radhakrishnan,Malgorzata Sliwinska-Bartkowiak +6 more
TL;DR: Both simple and more complex adsorbates that are confined in various environments (slit or cylindrical pores and also disordered porous materials) are considered and how confinement affects the glass transition is addressed.
Journal ArticleDOI
Confinement effects on freezing and melting
TL;DR: A review of experimental work on freezing and melting in confinement is presented in this paper, where a range of systems, from metal oxide gels to porous glasses to novel nanoporous materials, are discussed.
Journal ArticleDOI
Melting and freezing of water in ordered mesoporous silica materials
TL;DR: In this paper, the melting and freezing of water in a series of mesoporous silica materials with a hexagonal arrangement of unidimensional cylindrical pores and narrow pore-size distribution was studied by differential scanning calorimetry (DSC).
Journal ArticleDOI
Hydrogen bonding of water confined in mesoporous silica MCM-41 and SBA-15 studied by 1H solid-state NMR.
Bob Grünberg,Thomas Emmler,Egbert Gedat,Ilja G. Shenderovich,Gerhard H. Findenegg,Hans-Heinrich Limbach,Gerd Buntkowsky +6 more
TL;DR: The adsorption of water in two mesoporous silica materials with cylindrical pores of uniform diameter, MCM-41 and SBA-15, was studied by 1H MAS (MAS=magic angle spinning) and static solid-state NMR spectroscopy and all observed hydrogen atoms are either surface -SiOH groups or hydrogen-bonded water molecules.
References
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Journal ArticleDOI
A new family of mesoporous molecular sieves prepared with liquid crystal templates
Jeffrey S. Beck,James C. Vartuli,Wieslaw J. Roth,M. E. Leonowicz,Charles T. Kresge,Kirk D. Schmitt,Cynthia Ting-Wah Chu,David H. Olson,E. W. Sheppard,S. B. McCullen,J. B. Higgins,J.L. Schlenker +11 more
TL;DR: In this paper, the synthesis, characterization, and proposed mechanism of formation of a new family of silicatelaluminosilicate mesoporous molecular sieves designated as M41S is described.
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Formation of Crystal Nuclei in Liquid Metals
TL;DR: In this paper, the authors calculated the interfacial energies between crystal nuclei and the corresponding liquids from nucleation frequencies of small droplets on the basis of homogeneous nucleation.
Journal ArticleDOI
A new method for the simultaneous determination of the size and shape of pores: the thermoporometry
TL;DR: In this paper, a thermodynamic study of the liquid-solid phase transformations in porous materials provides the relationships between the size of the pores in which solidification takes place and the temperature of the triple point of the divided liquid, on the one hand, and between this temperature and the apparent solidification energy on the other hand.
Journal ArticleDOI
Porous vycor glass: The microstructure as probed by electron microscopy, direct energy transfer, small-angle scattering, and molecular adsorption
TL;DR: In this article, the microstructure of vycor has been analyzed using transmission electron microscopy, smallangle x-ray scattering, molecular adsorption, and the dynamic process of direct energy transfer.