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首页> 外文期刊>Crystal growth & design >Growth Pattern Dependence of Tetrahydrofuran Hydrates in Glass Beads of Two Sizes on Growth Rate and Glass Bead Mixing Ratio
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Growth Pattern Dependence of Tetrahydrofuran Hydrates in Glass Beads of Two Sizes on Growth Rate and Glass Bead Mixing Ratio

机译：两种尺寸的玻璃微珠中四氢呋喃水合物的生长方式对生长速率和玻璃微珠混合比的依赖性

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摘要

We observed the pattern formation of tetrahydrofuran (THF) clathrate hydrates in a mixture comprising a THF?17H_2O solution and glass beads of two sizes (2 and 50 μm diameter) as functions of growth rate and glass bead mixing ratios (by weight). The overall hydrate growth rate, V, was controlled using a directional growth apparatus. The results showed that the growth interface of the initial hydrate layer destabilized with growth. The wavelength, λ, of the destabilized initial hydrate layer demonstrated a power law decrease as the growth rate V increased. We successfully formed various hydrate patterns and classified them into a pattern diagram according to the glass bead mixing ratio and the growth rate V. In addition, we are the first to successfully obtain a needle pattern. Image analysis showed that the segregated growth area of the hydrates and the average hydrate area increased, whereas the number density of hydrate grains decreased with decreasing V. These results are qualitatively consistent with the frost heave model. Finally, we proposed needle, nodular, and massive pattern hydrate formation models by summarizing the discussions from the frost heave model and the morphological instability model of crystal growth.
机译：我们观察到四氢呋喃（THF）笼形水合物在包括THF？17H_2O溶液和两种尺寸（直径2和50μm直径）的玻璃珠的混合物中的图形形成与生长速率和玻璃珠混合比（按重量计）的关系。使用定向生长设备控制总水合物生长速率V。结果表明，初始水合物层的生长界面随着生长而不稳定。不稳定的初始水合物层的波长λ显示出随着生长速率V增加，幂律减小。我们成功地形成了各种水合物图案，并根据玻璃珠的混合比例和生长速度V将它们分类为图案图。此外，我们是第一个成功获得针状图案的人。图像分析表明，水合物的分离生长面积和平均水合物面积增加，而水合物晶粒的数量密度随V的减小而降低。这些结果与冻胀模型定性一致。最后，通过总结冻胀模型和晶体生长的形态不稳定性模型的讨论，我们提出了针状，结节状和块状水合物形成模型。

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