Dynamics of crystallization of solid ethanol

Ефимов, В. М.; Izotov, A. N.; Rybchenko, O. G.

doi:10.1063/1.5055862

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…This hypothesis is confirmed by Efimov et al, 27 who studied the kinetics of phase transition of solid ethanol from the amorphous to the crystalline phase and found the size effect in the rate and activation energy of this transition. They showed that bulk amorphous samples of solid alcohol that were several millimeters in size crystallized into the monoclinic phase within several hours at approximately 125 K, while “in amorphous nanocluster samples consisting of clusters of the order of tens nanometers in size, a similar transition was observed”, even at 110 K. However, this also contradicts our data, since we did not detect the phase transition upon warming the amorphous film grown on platinum at 80 K by exposing to 300 L of ethanol even at 120 K for 2 h. In this case, the average thickness of the solid ethanol film was approximately 30 ML or 18 nm.…”

Section: Resultssupporting

confidence: 61%

Low Temperature Multilayer Adsorption of Methanol and Ethanol on Platinum

et al. 2022

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Adsorption of methanol and ethanol on the clean Pt(111) surface was studied at temperatures between 80 and 130 K using polarization-modulation infrared reflection absorption spectroscopy (PM–IRRAS). It was shown that adsorption of methanol at 80 K leads to the formation of amorphous solid methanol, and fast crystallization of the amorphous phase occurs upon warming at 100 K. Vapour deposition of methanol at 100 K directly leads to the formation of well-crystallized layers of solid methanol. According to PM–IRRAS, these crystalline layers consist of chains of hydrogen-bonded methanol molecules lying in a plane oriented close to the normal to the platinum surface. Adsorbed methanol is removed completely from platinum after heating to 120 K. Vapour deposition of ethanol at 80 K also leads to the formation of amorphous solid ethanol. However, subsequent warming does not lead to ordering of the adsorption layers, and at 130 K, ethanol is also completely desorbed.

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Section: Resultssupporting

confidence: 61%

Low Temperature Multilayer Adsorption of Methanol and Ethanol on Platinum

et al. 2022

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“…Ethanol is known for the presence of different solid forms depending on the temperature and thermal process used. − For the bulk, rapid cooling to a temperature lower than 100 K results in an amorphous solid, whereas a rotator phase and an orientational glass may be produced by moderate cooling of the liquid. The monoclinic crystalline structure can be readily obtained at a temperature close to melting or by annealing of the amorphous solid.…”

Section: Introductionmentioning

confidence: 99%

Ethanol on Graphite: Ordered Structures and Delicate Balance of Interfacial and Intermolecular Forces

Yang

2021

J. Phys. Chem. C

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Clear knowledge of solid–molecule interfacial structures is essential to the understanding of interfacial phenomena and the interplay of surface effects and intermolecular forces. Molecules that can form hydrogen bonds are of particular interest. Here, we report the structures and phase-transition behavior of (sub)nanometer thick ethanol assemblies deposited on highly orientated pyrolytic graphite. Depending on the film thickness and temperature, three ordered structures of ethanol are observed: first, an interfacial one formed after deposition at ∼100 K that is near-commensurate with the supporting graphene lattice, up to a nominal thickness of 1.5 nm; second, stacking of two-dimensional layered sheets at ≥114 K for the upper part of thicker films of ∼2 nm and above; and third, a monoclinic bulk-like structure appearing at ∼144 K before desorption. Importantly, the whole amorphous-to-crystalline transition undergoes a complex multistep process, with the extension of the interfacial structure reaching much further away from the substrate surface and then being replaced within a low-temperature range. Together with the lattice strain found in the interfacial assembly, these thickness- and temperature-dependent structures and transition behavior signify a delicate balance between all interfacial and intermolecular forces involved and molecular free energy.

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