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Fall 2015 Seminars

August 31, 2015
September 7, 2015<Labour Day>
September 14, 2015

Pattern formation in block copolymer layers after a temperature quench

Alexander Wagner
September 21, 2015Pushing 2D Block Copolymers into the Third DimensionAndrew B. Croll
September 28, 2015 Connecting Physics Education Research across the Disciplines Warren Christensen
October 5, 2015

On How Being Soft and Squishy Affects Phase Behavior:  The Case of Charged-Microgel Suspensions
Alberto Fernandez-Nieves
October 12, 2015The Electrostatic Contribution to the Line Tension between Lipid Membrane Domains Guilherme Volpe Bossa
October 19, 2015

Electrical Double Layer Structure at the Water-Silica Interface: Role of Counterion Size, pH and Hydration Interactions

Matthew Brown
October 26, 2015 
November 2, 2015Investigating the Impact of Metacognitive Interventions on Student ReasoningNathan Grosz
November 9, 2015Infrared Astronomy from the Ground,  Air, and SpaceRobert D. Gehrz
November 16, 2015
November 23, 2015Electrostatic Interactions at Dielectric Interfaces: from Membranes to Colloids
Guilherme Volpe Bossa
November 30, 2015Sylvio May

December 7, 2015

December 14, 2015<Exam Week!>



Electrostatic Interactions at Dielectric Interface: From Membranes to Colloids

Guilherme Volpe Bossa (Comprehensive Exam Talk)

Department of Physics,


Electrostatic Interactions at Dielectric Interfaces: from Membranes to Colloids

Monday, November  23, 2015, 3:00-4:00pm

221 South Engineering

In this talk I will cover some of the projects that have been carried out during my PhD.  The first project refers to a spherical nanoparticle trapped at the dielectric interface between air and water.  In such a scenario, the mismatch of dielectric constants causes an asymmetric charge distribution over the particle surface
and gives rise to long range repulsive forces. Based on the Poisson-Boltzmann theory and solving a mixed boundary-value problem, we developed a model that determines the electrostatic potential everywhere in the system in terms of the distinct charge distributions, salt concentration, and the different dielectric constants in water, air and inside the particle.  In the second project we analyzed ion specific effects in a system constituted by a flat negatively charged solid surface exposed to a symmetric 1:1 electrolytic solution.  Upon the addition of a non-electrostatic cation-cation repulsion to the electrostatic Coulomb potential (an extension of the classical Poisson-Boltzmann theory known as the Poisson-Helmholtz-Boltzmann model), we could relate the formation of a Stern layer to the effective size of hydrated ions.  Besides these two major topics, I will also talk about the line tension between charged membrane domains and lipid correlations.

Spring 2016 Seminars

January 18, 2016<Martin Luther King Jr. Day>
January 25, 2016Force field versus nonadiabatic  molecular dynamics for photocatalytic and gas storage applications: Porous silica and metals-organic frameworks.Wendi Sapp
February 1, 2016
February 8, 2016
February 15, 2016<Presidents Day>

February 22, 2016

February 29, 2016
March 7, 2016
March 14, 2016
March 21, 2016
March 28, 2016<Holiday>
April 4, 2016
April 11, 2016
April 18, 2016

April 25, 2016

May 2, 2016
May 9, 2016<Exam Week!>



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Last Updated: Monday, November 23, 2015 10:10:51 PM