Optical properties of methanol at high pressures

Yenice, Kamil M.; Lee, Scott A.; Downs, David

doi:10.1080/00268979000100741

Cited by 5 publications

(1 citation statement)

References 28 publications

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“…Optical microscopy proved to be a clarifying tool to examine methanol at high pressure: Samples compressed up to about 5.0 GPa look perfectly clear and, as is revealed using two polarizers, show no depolarization, consistent with the observations of Yenice et al 34 For pressures in the range between about 5.0 and 10.5 GPa, many of the samples obtain a facetlike morphology as is shown in Fig. 1͑a͒.…”

Section: A Phase Identificationsupporting

confidence: 73%

Competition between vitrification and crystallization of methanol at high pressure

Brugmans

Vos

1995

The Journal of Chemical Physics

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Competition between vitrification and crystallization of methanol at high pressure Brugmans, M.J.P.; Vos, W.L. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. We have studied methanol at high pressure up to 33 GPa at room temperature with x-ray diffraction, optical ͑polarization͒ microscopy, Raman spectroscopy, and detection of hydrostaticity. A competition between crystallization and vitrification is observed when methanol is superpressed beyond the freezing pressure of 3.5 GPa: between 5.0 and 10.5 GPa crystals can nucleate, but if this region is surpassed quickly enough ͑within a few seconds͒, methanol remains amorphous. For the first time the nucleation rate and the crystal growth velocity have been studied as a function of pressure. These kinetic properties can be described by classical nucleation theory in agreement with, respectively, Turnbull-Fisher and Wilson-Frenkel type behavior using one and the same activated hard-sphere diffusion coefficient. The experimental nucleation rate and the crystal growth velocity are both effectively reduced to zero above 10.5 GPa, because the diffusion is suppressed. At these pressures methanol is compressed into a glass.

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Section: A Phase Identificationsupporting

confidence: 73%

Competition between vitrification and crystallization of methanol at high pressure

Brugmans

Vos

1995

The Journal of Chemical Physics

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Hydrogen bonding and the liquid‐to‐glass transition in propan‐1‐ and ‐2‐ol at high pressures

Yenice

Reed

Lee

et al. 1991

J Raman Spectroscopy

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The pressure dependence of the vibrational modes of propan-1-and 2-01 was measured by Raman spectrwopy up to 8 GPa at 300 K. Changes in the observed vibrational spectra indicate that the samples undergo a liquid-teglass transition at about 4.5 GPa for propan-%ol and about 5.5 GPa for propan-1-01. The frequency of the 0-H stretching mode (a probe of the degree of hydrogen bonding) was found to decrease at a rate of cu -28 cm-' GPa-' for both propan-1-and -2-01.

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Dynamic light scattering measurements of high-pressure viscosity utilizing a diamond anvil cell

Herbst

King

Gao

et al. 1992

Journal of Applied Physics

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Dynamic light scattering (DLS) is a widely used and powerful technique for studying the dynamics of fluids. We demonstrate here the first use of DLS in the diamond anvil cell. Using 91 nm polystyrene spheres suspended in methanol in the chamber of a diamond anvil cell, we show that the viscosity of the fluid can be accurately measured using this technique. Measurements up to 2.90 GPa are reported. Previous reports of DLS measurements have used large-volume pressure cells that limited the data to moderate pressures, but with the diamond anvil cell no such limitations exist. However, a significant difficulty in DLS measurements with the diamond cell comes from the small size of the pressure chamber. Not only does this lead to a weak scattered intensity, but scattering from the sample is combined with partly coherent scattering from the diamond/air and diamond/sample interfaces, thus complicating data interpretation. We show how this heterodyne component can bias the measured diffusion coefficients and then demonstrate a straightforward procedure by which this heterodyne component can be minimized. The resulting diffusion coefficients (ranging from 10−8 to 10−10 cm2 s−1), recalculated as viscosity, are found to have an average precision of 2.5% and are in excellent agreement with literature values.

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Optical properties of methanol at high pressures

Cited by 5 publications

References 28 publications

Competition between vitrification and crystallization of methanol at high pressure

Competition between vitrification and crystallization of methanol at high pressure

Hydrogen bonding and the liquid‐to‐glass transition in propan‐1‐ and ‐2‐ol at high pressures

Dynamic light scattering measurements of high-pressure viscosity utilizing a diamond anvil cell

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