Date of Award
Master of Science in Chemical Engineering - (M.S.)
Saul I. Kreps
George C. Keeffe
The purpose of this investigation was to design and construct a furnace for growing large single crystals of organic compounds by slow crystallization from the melt by the Bridgman technique. The crystals obtained by this furnace will be used in a later investigation of the intrinsic electrical and optical properties of organic semiconductors.
The methods describe have been used width success to produce large single crystals of anthracene and ethyl-p aminobenzoate with diameters of 1/2 inch.
The most promising methods of purification of anthracene, which were chemical synthesis, washing, recrystallization from solvents, sublimation, dimerization, co-distallatian and zone refining have been investigated. The relative merit of each method were explored and discussed with particular attention to co-distillation which is considered to be the most applicable. Anthracene of higher purity than commercial zone refined anthracene was prepared and is believed to be adequate for crystal growth and subsequent electrical measurements.
A very simple fluorescence technique for qualtitative analysis of traces of naphthacene in anthracene was developed which employs a colloidal suspension of the sample. Sensitivity approaching 0.1 ppm naphthacene in anthracene is readily obtainable. The method is convenient to use, involving samples and uncomplicated manipulative techniques. For rapid semiquantitative analysis, it provides a visible fluoreucence color correlation with level of impurity.
Druin, Melvin Leonard, "The purification, analysis and growth of single crystals of organic semiconductors" (1964). Theses. 2104.