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Crystallization af normal paraffins from the melt on crystalline and non-crystalline substratesтезисы доклада
- Авторы: Volkova E.A., Fedorinova E.V., Leonyuk N.I.
- Сборник: Abstr. bookof The 5th IUMRS Intern. Conference on Advanced Materials
- Том: 2
- Тезисы
- Год издания: 1999
- Место издания: Beijing, China
- Первая страница: 33
- Аннотация: In the present work, the crystal growth experiments were carried out by cooling paraffin melt in the temperature range of 55-25oC using crystalline (quartz) and non-crystalline (glass) substrates . The grown crystals were studied by electron and optical microscopies, and also by X-ray diffraction method. It was identified both hexagonal and orthorhombic crystals. Hexagonal and orthorhombic forms of normal paraffins crystallize at the cooling rates of 25.5, 10 and 4oC/h in the above temperature range, and dimensions of the plate-like crystals increase in about 1.5-2 times with decreasing cooling rates. Final crystalline solids contain about 85 wt.% orthorhombic paraffin crystals. Hexagonal paraffins were partly presented by dendrites. Structural characteristics and type of the grown paraffin crystals were determined from X-ray diffraction patterns. Size and morphology of these crystals depend on the crystallographic orientation of quartz substrates in the temperature interval of 50-25oC.
- Добавил в систему: Леонюк Николай Иванович