Amorphous films of contorted hexabenzocoronene form two visually different types of crystals when annealed at 240 degrees Celsius. This sample was part of an experiment analyzing how crystals grow within a film.
To track growth rates, crystallization was halted every minute, resulting in the concentric ring pattern in the large crystal. As the large crystal grew, it trapped a few of the smaller ones in its path, resulting in the varying diameters of small crystals within the large one.
– Jessica Lynn Saylors, Anna Hiszpanski and Yueh-Lin Loo
Jessica Lynn Saylors '13, Anna Hiszpanski (graduate student), Yueh-Lin Loo (faculty), Department of Chemical and Biological Engineering