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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Phase Transitions of Naphthalene and Its Derivatives Confined in Mesoporous Silicas
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Phase Transitions of Naphthalene and Its Derivatives Confined in Mesoporous Silicas

机译：介孔二氧化硅中萘及其衍生物的相变

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摘要

The phase transitions of naphthalene and its derivatives including 2-methylnaphthalene, 2-methyoxynaphthalene, and 2-chloronaphthalene confined in mesoporous silicas of spherical and cylindrical pore geometry were investigated by differential scanning calorimetry (DSC), and a depression of the phase transition temperature was observed. It was found that depression and freeze—melt hysteresis are generally greater in spherical pores. Using powder X-ray diffraction, it was observed that the crystal structure of confined naphthalene is the same as the bulk. Using DSC and Raman spectroscopy, it was shown on both is the same as the bulk. Using DSC and Raman spectroscopy, it was shown on both a thermodynamic and molecular level that there is a nonfreezing layer on the pore walls for each confined compound and its thickness depends on the pore diameter.
机译：用差示扫描量热法（DSC）研究了球形和圆柱形孔几何形状的介孔二氧化硅中萘及其衍生物（包括2-甲基萘，2-甲氧基萘和2-氯萘）的相变，发现相变温度降低了观测到的。发现球形孔中的凹陷和冻结-熔体滞后通常更大。使用粉末X射线衍射，观察到受限萘的晶体结构与体相相同。使用DSC和拉曼光谱法，两者的体积显示相同。使用DSC和拉曼光谱法，在热力学和分子水平上均显示，每种受限化合物的孔壁上均存在一个非冻结层，其厚度取决于孔径。

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