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Spring 2018 Seminars

Jan 8, 20181D Capillary Bending of a Thin, Floating Polymer FilmTimothy Twohig
Jan 15, 2018

 <Martin Luther King, Jr. Day>

January 22, 2018
January 29, 2018Coarse-Grained Modeling of Microgels (Mostly)Alan Denton
February 5, 2018Carrier Multiplication in Chiral Single-Walled Carbon Nanotubes and Silicon Nanowires: DFT-Based StudyDeyan Mihaylov
February 12, 2018Theory and simulation of dispersions with competing interactions applied to protein solutionsGerhard Nägele
February 13, 2018Methods for calculating effective interactions and pressure in charge-stabilized dispersions with application to filtrationMariano Brito
February 19, 2018<President's Day>
February 26, 2018Time-Dependent Excited State Molecular Dynamics: from photo-fragmentation to photo-polymerizationYulun Han
March 5, 2018<APS March Meeting>
March 12, 2018<Spring Break>
March 19, 2018
March  26, 2018Speaking an Employer's LanguageOlivia Scott
April 2, 2018<Holiday>
April 9, 2018Guiding Self-Assembly of Functionalized Nanoparticles by Computational Modeling of Effective InteractionsVijay Shah
April 16, 2018

Helical Interactions of DNA<CANCELLED DUE TO SNOW>

Curvature Elasticity of the Electric Double Layer

Aaron Wynveen<Cancelled>

Sylvio May

April 23, 2018<TBA>Cody Gette
April 30, 2018Charge Properties of TiO2 NanotubesKlemen Bohinc
May 7, 2018<Final Exam Week>Wyatt Davis


Curvature Elasticity of the Electric Double Layer
Sylvio May

Associate Professor and Chair,
Department of Physics and Astronomy,
North Dakota State University



Monday April 16, 3:00-4:00pm,
221 South Engineering

Mean-field electrostatics is used to calculate the bending moduli of an electric double layer for fixed surface charge density of a macroion in a symmetric 1:1 electrolyte. The resulting expressions for bending stiffness, Gaussian modulus, and spontaneous curvature refer to a general underlying equation of state of the electrolyte, subject to a local density approximation and the absence of dipole and higher-order fields. We present results for selected applications: the lattice-gas Poisson-Fermi model with and without asymmetric ion sizes, and the Poisson-Carnahan-Starling model.

<CANCELLED DUE TO SNOW>Helical Interactions of DNA
Aaron Wynveen

Post Doctoral Fellow,
Department of Physics and Astronomy,
University of Minnesota.


Refreshments at 2:30

Monday April 16, 3:00-4:00pm,
221 South Engineering

The interactions between DNA molecules are involved in a number of important physiological processes, such as packing of genetic material within cells and viral phage heads, the formation of mesoscopic DNA structures in vivo and in vitro, and the recognition of homologous genes required for DNA repair and homologous recombination.  Yet many of these processes, to this day, remain poorly understood, and theories that treat DNA as simple, unstructured polyelectrolytes are unable to fully explain many physical phenomena.  We have recently developed a theory that considers how the helical structure of DNA may govern its interactions.  In this talk,
I will review this theory, first describing classical experiments probing the double-helical structure of DNA -- and what was overlooked in these experiments -- and then explore the many physical manifestations of this theory, paying particular attention to recent theoretical and experimental work investigating molecular recognition of homologous (same sequence) DNA.

Charge Properties of TiO2 Nanotubes
Klemen Bohinc

Assistant Professor,
Faculty of Health Sciences and Faculty of Electrical Engineering,
University of Ljubljana.


Refreshments at 2:30

Monday April 30, 3:00-4:00pm,
221 South Engineering

Charging of material surfaces in aqueous electrolyte solutions is important to better understand interactions between biomaterials and surrounding tissue. In our work we studied the surface charge properties of titania nanotubes in NaNO3 solution using polyelectrolyte colloid titration measuring technique. High-resolution transmission electron microscopy imaging was used to determine the morphology of nanotubes. A theoretical model based on the classical density functional theory coupled with the charge regulation method in terms of mass action law was developed in order to understand the experiments.

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Last Updated: Monday, April 16, 2018 10:37:41 AM
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