Iannacchione, Germano S.
This project experimentally determined how the nematic-isotropic phase transitions of colloidal composites consisting of 5CB and C60 change as C60 mass concentration increases. Using MDSC comparisons of the concentration's reversible and nonreversible heat capacitance signals were analyzed which yielded values for phase transition temperature, enthalpy, and coexistence region of both phases. The analysis showed fluctuating results. Polarized light microscope images showed isolated domains of C60 and 5CB. A mechanically quenched macroscopic model of the composites was constructed and tested. Steric modeling confirmed that the local domains were due to the unique geometries of 5CB and C60 and that steric packing may account for the unexpected thermal results.
Worcester Polytechnic Institute
Major Qualifying Project
All authors have granted to WPI a nonexclusive royalty-free license to distribute copies of the work, subject to other agreements. Copyright is held by the author or authors, with all rights reserved, unless otherwise noted.