Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 11, Pages 4738-4748Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp111432j
Keywords
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Funding
- Natural Science and Engineering Research Council of Canada
- Canada Research Chair program
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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 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.
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