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Department of Physics

Physics Department
116 Cardwell Hall
1228 N. 17th St.
Manhattan, KS 66506-2601

785-532-6786
785-532-6806 Fax
office@phys.ksu.edu

NSF REU at K-State: Interactions of Matter, Light and Learning 

The K-State REU program offers summer fellowships to do world-class research in our friendly physics department in the scenic Flinthills. We are funded by the National Science Foundation.

Condensed Matter (CM) or Soft Matter Physics  
Jeremy SchmitDr. Jeremy Schmit: Understanding Protein Self-assembly through simplified models
Email: schmit@phys.ksu.edu 

Amyloid fibrils are linear protein aggregates associated with many diseases including Alzheimer's, prion (e.g. Mad Cow), and type 2 diabetes. Structural studies have shown that amyloids are highly ordered assemblies resembling 1D crystals. However, this finding is biased by the lack of structural methods that can characterize disordered biomolecule structures. The goal of this project is to understand the factors that will introduce defects into fibrils and to predict the level of disorder that results. This will involve the derivation of simple analytic theories and conducting numerical simulations of toy models. 

 

Chris Sorensen
 
Dr. Chris Sorensen: Suspensions as Solutions: Solubility of Nanoparticles
Email: sor@phys.ksu.edu

We have developed chemical methods to make nanoparticles with very uniform size. We have discovered that because of this size uniformity suspensions of these nanoparticles can act like solutions with thermally reversible, temperature dependent solubility. We have published one study [1], which involved a REU student, for 5 nm gold nanoparticles to determine their solubility as a function of their ligand shell and the solvent. We have extended these studies to the temperature dependence and data obtained by previous REU students has led to another paper recently submitted [2]. We need to continue this work to determine the effects of the ligand shell and particle size on the solubility temperature dependence. With analysis, these data will lead to a measure of the interparticle potential. This is a good project for someone who has interests in both physics and chemistry.

References (Bold type indicates REU student):

1. “Solubility of Gold Nanoparticles as a Function of Ligand Shell and Alkane Solvent”, B. C. Lohman, J. A. Powell, S. Cingarapu, C. B. Aakeroy, A. Chakrabarti, K. J. Klabunde, B. M. Law, and C. M. Sorensen, Phys. Chem. Chem. Phys., 14, 6502- 6506 (2012).

2. “Temperature Dependent Solubility of Gold Nanoparticle Suspension/Solutions”, J. A. Powell, R. M. Schweiters, K. W. Bayliff, E. N. Herman, N. J. Hotvedt, J. R. Changstrom, A. Chakrabarti and C. M. Sorensen*, submitted to the Journal of Physical Chemistry B.

National Science Foundation

This program is funded by the National Science Foundation through grant number PHY-1157044. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.