Crystal Growth of Clathrate Hydrates Formed at the Interface of Liquid Water and Gaseous Methane, Ethane, or Propane: Variations in Crystal Morphology

2009 ◽  
Vol 9 (5) ◽  
pp. 2529-2536 ◽  
Author(s):  
Ryo Tanaka ◽  
Riki Sakemoto ◽  
Ryo Ohmura
Keyword(s):  
Crystal Growth ◽  
Liquid Water ◽  
Crystal Morphology ◽  
Clathrate Hydrates

scholarly journals Crystal growth of clathrate hydrates formed with methane + carbon dioxide mixed gas at the gas/liquid interface and in liquid water

2015 ◽  
Vol 39 (11) ◽  
pp. 8254-8262 ◽  
Author(s):  
Hiroki Ueno ◽  
Hotaka Akiba ◽  
Satoru Akatsu ◽  
Ryo Ohmura
Keyword(s):  
Carbon Dioxide ◽  
Crystal Growth ◽  
Liquid Water ◽  
Liquid Interface ◽  
Clathrate Hydrates ◽  
Mixed Gas ◽  
Hydrate Crystal ◽  
Methane Carbon

Observations of CH4 + CO2 hydrate crystal growth formed at the gas/liquid interface and in liquid water were made.

scholarly journals Synthesis of magnesium carbonate hydrate from natural talc

2020 ◽  
Vol 18 (1) ◽  
pp. 951-961
Author(s):  
Qiuju Chen ◽  
Tao Hui ◽  
Hongjuan Sun ◽  
Tongjiang Peng ◽  
Wenjin Ding
Keyword(s):  
Crystal Structure ◽  
Particle Size ◽  
Crystal Growth ◽  
Crystal Morphology ◽  
Magnesium Carbonate ◽  
Organic Additives ◽  
X Ray Diffraction ◽  
Morphological Transformation ◽  
X Ray ◽  
Carbonation Process

AbstractVarious morphologies of magnesium carbonate hydrate had been synthesized without using any organic additives by carefully adjusting the reaction temperature and time during the talc carbonation process. At lower temperatures, magnesium carbonate hydrate was prone to display needle-like morphology. With the further increase of the carbonation temperature, the sheet-like crystallites became the preferred morphology, and at higher aging temperatures, these crystallites tended to assemble into layer-like structures with diverse morphologies, such as rose-like particles and nest-like structure. The reaction time had no effect on the crystal morphology, but it affected the particle size and situation of the crystal growth. X-Ray diffraction results showed that these various morphologies were closely related to their crystal structure and compositions. The needle-like magnesium carbonate hydrate had a formula of MgCO3·3H2O, whereas with the morphological transformation from needle-like to sheet-like, rose-like, and nest-like structure, their corresponding compositions also changed from MgCO3·3H2O to 4MgCO3·Mg(OH)2·8H2O, 4MgCO3·Mg(OH)2·5H2O, and 4MgCO3·Mg(OH)2·4H2O.

scholarly journals Ice Growth Acceleration by Antifreeze Proteins Leads to Higher Thermal Hysteresis Activity

2020 ◽  
Author(s):  
Jinzi Deng ◽  
Elana Apfelbaum ◽  
Ran Drori
Keyword(s):  
Crystal Growth ◽  
Growth Inhibition ◽  
Growth Velocity ◽  
Crystal Morphology ◽  
Thermal Hysteresis ◽  
Antifreeze Proteins ◽  
Ice Crystal ◽  
Ice Growth ◽  
Thermal Hysteresis Activity ◽  
Adsorption Rates

<p>Since some antifreeze proteins and glycoproteins (AF(G)Ps) cannot directly bind to all crystal planes, they change ice crystal morphology by minimizing the area of the crystal planes to which they cannot bind until crystal growth is halted. Previous studies found that growth along the <i>c</i>-axis (perpendicular to the basal plane, the crystal plane to which these AF(G)Ps cannot bind) is accelerated by some AF(G)Ps, while growth of other planes is inhibited. The effects of this growth acceleration on crystal morphology and on the thermal hysteresis activity are unknown to date. Understanding these effects will elucidate the mechanism of ice growth inhibition by AF(G)Ps. Using cold stages and an Infrared laser, ice growth velocities and crystal morphologies in AF(G)P solutions were measured. Three types of effects on growth velocity were found: concentration-dependent acceleration, concentration-independent acceleration, and concentration-dependent deceleration. Quantitative crystal morphology measurements in AF(G)P solutions demonstrated that adsorption rate of the proteins to ice plays a major role in determining the morphology of the bipyramidal crystal. These results demonstrate that faster adsorption rates generate bipyramidal crystals with diminished basal surfaces at higher temperatures compared to slower adsorption rates. The acceleration of growth along the <i>c</i>-axis generates crystals with smaller basal surfaces at higher temperatures leading to increased growth inhibition of the entire crystal.<a></a></p>

Diversity in Crystal Growth Dynamics and Crystal Morphology of Structure-H Hydrate

2019 ◽  
Vol 19 (11) ◽  
pp. 6398-6404
Author(s):  
Riku Matsuura ◽  
Shunsuke Horii ◽  
Saman Alavi ◽  
Ryo Ohmura
Keyword(s):  
Crystal Growth ◽  
Crystal Morphology ◽  
Growth Dynamics

Dynamics of Methane−Propane Clathrate Hydrate Crystal Growth from Liquid Water with or without the Presence ofn-Heptane

2006 ◽  
Vol 6 (6) ◽  
pp. 1428-1439 ◽  
Author(s):  
Ju Dong Lee ◽  
Myungho Song ◽  
Robin Susilo ◽  
Peter Englezos
Keyword(s):  
Crystal Growth ◽  
Liquid Water ◽  
Clathrate Hydrate ◽  
Hydrate Crystal
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