TY - JOUR
T1 - Crystal Growth of Clathrate Hydrate with Methane plus Partially Water Soluble Large-Molecule Guest Compound
AU - Ozawa, Kazuya
AU - Ohmura, Ryo
N1 - Funding Information:
This study was supported by a Keirin-racing-based research-promotion fund from the JKA Foundation (Grant No. 28-142) and by JSPS KAKENHI (Grant Number 17H03122). We thank Takao Shibata and Shun Oya, students at Keio University, for their contribution to the experimental works.
PY - 2019/3/6
Y1 - 2019/3/6
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 T sub T eq - T ex , where T eq is the equilibrium temperature and T ex is the experimental temperature. At T sub ≥ 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 T sub < 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 T sub T eq - T ex , where T eq is the equilibrium temperature and T ex is the experimental temperature. At T sub ≥ 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 T sub < 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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U2 - 10.1021/acs.cgd.8b01625
DO - 10.1021/acs.cgd.8b01625
M3 - Article
AN - SCOPUS:85061190708
SN - 1528-7483
VL - 19
SP - 1689
EP - 1694
JO - Crystal Growth and Design
JF - Crystal Growth and Design
IS - 3
ER -