Phase transitions of ethylene on graphite

H. K. Kim, Y. P. Feng, Qiming Zhang, Moses Hung-Wai Chan

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The results of an extensive thermodynamic study of the phase transitions of monolayer and multilayer ethylene on graphite are presented. In the submonolayer and near-monolayer completion regions, the melting transition is found to be continuous. Heat-capacity anomalies indicative of orientational and structural transitions of monolayer solid phases are found. Our result indicates the existence of a third monolayer solid phase in addition to the low- and high-density phases defined according to the orientation of the carbon-carbon axis of the molecule with respect to the substrate surface. In the multilayer region, our result is consistent with the interpretation that the wetting transition is pinned at Tt, the bulk triple-point temperature, and it is approached via a sequence of layering transitions. Liquidlike ethylene film is found to be layered by the graphite substrate well above Tt. The layer critical point Tc(m), the high-temperature limit where a film of m-1 layers coexists with that of m layers, is found to decrease towards Tt with increasing m. The monolayer-bilayer layer-critical-point transition is found to be two-dimensional Ising-like. The isotopic effects in two-dimensional orientational, melting, and liquid-vapor transitions were also studied in this experiment.

Original languageEnglish (US)
Pages (from-to)3511-3523
Number of pages13
JournalPhysical Review B
Volume37
Issue number7
DOIs
StatePublished - Jan 1 1988

Fingerprint

Graphite
Monolayers
Ethylene
ethylene
graphite
Phase transitions
Multilayers
Melting
Carbon
solid phases
critical point
Substrates
melting
Specific heat
Wetting
carbon
Vapors
Thermodynamics
wetting
Temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Kim, H. K. ; Feng, Y. P. ; Zhang, Qiming ; Chan, Moses Hung-Wai. / Phase transitions of ethylene on graphite. In: Physical Review B. 1988 ; Vol. 37, No. 7. pp. 3511-3523.
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Kim, HK, Feng, YP, Zhang, Q & Chan, MH-W 1988, 'Phase transitions of ethylene on graphite', Physical Review B, vol. 37, no. 7, pp. 3511-3523. https://doi.org/10.1103/PhysRevB.37.3511

Phase transitions of ethylene on graphite. / Kim, H. K.; Feng, Y. P.; Zhang, Qiming; Chan, Moses Hung-Wai.

In: Physical Review B, Vol. 37, No. 7, 01.01.1988, p. 3511-3523.

Research output: Contribution to journalArticle

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N2 - The results of an extensive thermodynamic study of the phase transitions of monolayer and multilayer ethylene on graphite are presented. In the submonolayer and near-monolayer completion regions, the melting transition is found to be continuous. Heat-capacity anomalies indicative of orientational and structural transitions of monolayer solid phases are found. Our result indicates the existence of a third monolayer solid phase in addition to the low- and high-density phases defined according to the orientation of the carbon-carbon axis of the molecule with respect to the substrate surface. In the multilayer region, our result is consistent with the interpretation that the wetting transition is pinned at Tt, the bulk triple-point temperature, and it is approached via a sequence of layering transitions. Liquidlike ethylene film is found to be layered by the graphite substrate well above Tt. The layer critical point Tc(m), the high-temperature limit where a film of m-1 layers coexists with that of m layers, is found to decrease towards Tt with increasing m. The monolayer-bilayer layer-critical-point transition is found to be two-dimensional Ising-like. The isotopic effects in two-dimensional orientational, melting, and liquid-vapor transitions were also studied in this experiment.

AB - The results of an extensive thermodynamic study of the phase transitions of monolayer and multilayer ethylene on graphite are presented. In the submonolayer and near-monolayer completion regions, the melting transition is found to be continuous. Heat-capacity anomalies indicative of orientational and structural transitions of monolayer solid phases are found. Our result indicates the existence of a third monolayer solid phase in addition to the low- and high-density phases defined according to the orientation of the carbon-carbon axis of the molecule with respect to the substrate surface. In the multilayer region, our result is consistent with the interpretation that the wetting transition is pinned at Tt, the bulk triple-point temperature, and it is approached via a sequence of layering transitions. Liquidlike ethylene film is found to be layered by the graphite substrate well above Tt. The layer critical point Tc(m), the high-temperature limit where a film of m-1 layers coexists with that of m layers, is found to decrease towards Tt with increasing m. The monolayer-bilayer layer-critical-point transition is found to be two-dimensional Ising-like. The isotopic effects in two-dimensional orientational, melting, and liquid-vapor transitions were also studied in this experiment.

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