Crystal Growth of Clathrate Hydrate with Methane plus Partially Water Soluble Large-Molecule Guest Compound

Kazuya Ozawa, Ryo Ohmura

Research output: Contribution to journalArticle

Abstract

This paper reports the visual observations of the formation and growth of clathrate hydrate formed with methane plus a partially water soluble guest, tetrahydropyran (THP). THP is known to form a structure II hydrate with methane. The crystal growth dynamics and crystal morphology changed depending on δTsub Teq - Tex, where Teq is the equilibrium temperature and Tex is the experimental temperature. At δTsub ≥ 12 K, the hydrate crystals initially formed at the water-THP interface and then grew to form a hydrate film. After the hydrate film was formed, the hydrate formation stopped. At δTsub < 12 K, the hydrate crystals that formed at the water-THP interface detached from the interface. The detachment of the hydrate crystals led to the maintenance of the interface and continual hydrate formation. These crystal growth dynamics may be ascribed to the reduced water-THP interfacial tension and the resulting enhancement of the wettability of hydrate with water in comparison with those in the system without THP.

Original languageEnglish
JournalCrystal Growth and Design
DOIs
Publication statusPublished - 2019 Jan 1

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clathrates
Methane
Crystallization
Hydrates
Crystal growth
hydrates
crystal growth
methane
Molecules
Water
water
molecules
Crystals
crystals
visual observation
crystal morphology
wettability
detachment
maintenance
Surface tension

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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title = "Crystal Growth of Clathrate Hydrate with Methane plus Partially Water Soluble Large-Molecule Guest Compound",
abstract = "This paper reports the visual observations of the formation and growth of clathrate hydrate formed with methane plus a partially water soluble guest, tetrahydropyran (THP). THP is known to form a structure II hydrate with methane. The crystal growth dynamics and crystal morphology changed depending on δTsub Teq - Tex, where Teq is the equilibrium temperature and Tex is the experimental temperature. At δTsub ≥ 12 K, the hydrate crystals initially formed at the water-THP interface and then grew to form a hydrate film. After the hydrate film was formed, the hydrate formation stopped. At δTsub < 12 K, the hydrate crystals that formed at the water-THP interface detached from the interface. The detachment of the hydrate crystals led to the maintenance of the interface and continual hydrate formation. These crystal growth dynamics may be ascribed to the reduced water-THP interfacial tension and the resulting enhancement of the wettability of hydrate with water in comparison with those in the system without THP.",
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AU - Ohmura, Ryo

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N2 - This paper reports the visual observations of the formation and growth of clathrate hydrate formed with methane plus a partially water soluble guest, tetrahydropyran (THP). THP is known to form a structure II hydrate with methane. The crystal growth dynamics and crystal morphology changed depending on δTsub Teq - Tex, where Teq is the equilibrium temperature and Tex is the experimental temperature. At δTsub ≥ 12 K, the hydrate crystals initially formed at the water-THP interface and then grew to form a hydrate film. After the hydrate film was formed, the hydrate formation stopped. At δTsub < 12 K, the hydrate crystals that formed at the water-THP interface detached from the interface. The detachment of the hydrate crystals led to the maintenance of the interface and continual hydrate formation. These crystal growth dynamics may be ascribed to the reduced water-THP interfacial tension and the resulting enhancement of the wettability of hydrate with water in comparison with those in the system without THP.

AB - This paper reports the visual observations of the formation and growth of clathrate hydrate formed with methane plus a partially water soluble guest, tetrahydropyran (THP). THP is known to form a structure II hydrate with methane. The crystal growth dynamics and crystal morphology changed depending on δTsub Teq - Tex, where Teq is the equilibrium temperature and Tex is the experimental temperature. At δTsub ≥ 12 K, the hydrate crystals initially formed at the water-THP interface and then grew to form a hydrate film. After the hydrate film was formed, the hydrate formation stopped. At δTsub < 12 K, the hydrate crystals that formed at the water-THP interface detached from the interface. The detachment of the hydrate crystals led to the maintenance of the interface and continual hydrate formation. These crystal growth dynamics may be ascribed to the reduced water-THP interfacial tension and the resulting enhancement of the wettability of hydrate with water in comparison with those in the system without THP.

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