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The 2017 Seventeenth Annual UMM Undergraduate Research Symposium (URS) celebrates student scholarly achievement and creative activities. Students from all disciplines participate in the URS. Types of presentations include posters, oral presentations, and short or abbreviated theatrical, dance, or musical performances. 

Presentations are accompanied by discussions and multimedia.

 


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Saturday, April 22 • 10:00am - 12:00pm
Development of a Three-Dimensional Image of a Colloidal Fluid

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Colloidal fluids—fluids that are a mixture of particles whose sizes and densities differ and remain mixed for a long period of time—are a fundamental part of our day to day lives, such as, lotions, toothpaste, and paints. Our previous research modeled a colloidal fluid with mixtures of two sizes of hard spheres. This research resulted in radial distribution functions that revealed the existence of two phases, one with only short-range structure and one with long-range structure. The objective of our current research is to construct a three-dimensional image showing what the fluids look like in different phases using the radial distribution of the particles. We first calculated the probability of finding a particle at each point in a sample 100x100x100 volume. The first three particles were manually placed using the graphs computed on Fortran of those particle probabilities. Using the MAXLOC function the locations of the 41 big and 1180 small surrounding particles were identified as coordinates in the sample volume then graphed in Mathematica. The resulting three-dimensional image, with both big and small species, shows separation between species and particles. Although further work is needed to explore various particle-filling orders in different phases, we have shown that these images do allow a three-dimensional visualization of how the particles align for short- and long-range structure. Increasing our knowledge of colloidal fluids and their structures could help in applications in which separation of materials is either desirable or undesirable in condensed-matter physics and material science.

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Saturday April 22, 2017 10:00am - 12:00pm
Student Center, Oyate Hall 600 E 4th St., Morris MN 56267