Date of Award


Degree Type


Degree Name

Master of Science




Dr. Yining Huang

Second Advisor

Dr. Zhifeng Ding

Third Advisor

Dr. Brian Pagenkopf


The phase transitions of naphthalene and its 2-substituted methyl, methoxy, and chloro derivatives confined in mesoporous silicas were investigated by differential scanning calorimetry. A depression of phase transition temperature was observed. A comparison of the naphthalene in spherical and cylindrical pore systems was made, and the effect of molecular properties on the phase transition depression of the four compounds was investigated. It was found that depression and freeze-melt hysteresis is generally greater in spherical pores, and that electronic and size effects are contributing factors to transition temperature depression. Using powder X-ray diffraction it was found that while the crystal structure of confined naphthalene is the same as the bulk, there is a lattice expansion of the crystal. Furthermore, using differential scanning calorimetry and Raman spectroscopy it was shown on both a thermodynamic and molecular level that there is a non-freezing layer on the pore walls for each confined compound.



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