The Aggregation and Liquid Crystal Properties of Bordeaux Dye
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2007
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Swarthmore College. Dept. of Physics & Astronomy
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Thesis (B.A.)
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Abstract
This paper explores the liquid crystal and aggregation properties of Bordeaux Dye along with a
more general theory of aggregation. Common properties of chromonic liquid crystal systems have
been expounded upon and re-evaluated. X-ray data were used to find the aggregate's cross-sectional
area, which was compared to that of a single molecule to show that the structure of the aggregates
is more complicated than a single-molecule stack. Theoretical aggregate size calculations show
that it is important to account for the rotational partition function term, and these aggregate size
distributions, along with a simple function found by exploring exciton theory, allow us to analyze the
absorption coefficient verses concentration data to find the stacking free energy. A phase diagram
for this molecule has also been produced and is compared to those of other chromonic systems.