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Seminars

Fall 2014 Seminars

Date

Title

Author

September 1, 2014

Labour Day

September 8, 2014

September 15, 2014

September 22, 2014

September 26, 2014

**Special time 3:00 - 4:00**Ab initio electron dynamics at metal–semiconductor nano-interfaces

Dmitri Kilin

September 29, 2014

October 6, 2014

October 13, 2014

Nathaniel Grosz

October 20, 2014

<Special Location!> Ruga Mechanics of Folding Atomic-Layer Nanostructures

Kyung-Suk Kim

October 27, 2014

Promoting and assessing student metacognition in physics

Alistair McInerny

November 3, 2014

How do Student Evaluations of Instruction Relate to Students’ Conceptual Learning Gains?

Warren Christensen

November 7, 2014

<Special Day!!>Encapsulation of solutes in lipid vesicles: Origins of life considerations

Tereza Souza

November 10, 2014

Transdermal Therapeutic Systems: Structure, Function and Exelon(r) as a convincing example.

Alfred Fahr

November 17, 2014

Effects of substrate on structural and electronic properties of laser-crystallized silicon films

Matt Semmler

November 24, 2014

Nitrogen Hydrides Towards Massive Star Forming Regions

Cody Gette

December 1, 2014

Microgels as Chemical Sensors and Drug Delivery Vehicles

Alan Denton

December 8, 2014

2D block copolymer films embedded in a 3D world

Andrew B. Croll

December 15, 2014

<Exam Week!> Elasticity-based mechanism for collective motion in natural and artificial swarms

Critian Huepe Minoletti

 

 

Elasticity-based mechanism for collective motion in natural and artificial swarms.

Cristián Huepe

Unaffiliated Research Scientist in Chicago supported by the National Science Foundation
and Visiting Scholar Applied Math Department
Northwestern University.

 

Monday, December 15, 2014, 3:00-4:00pm, Refreshments at 2:30.

221 South Engineering

Collective motion is one of the simplest forms of self-organization in systems of active components such as cell colonies, bird flocks, fish schools, or groups of autonomous robots.  Its emergence in fluid-like swarms with aligning interactions has been the focus of much research activity. In this talk, I will introduce a different model for collective motion, consisting of self-propelled particles connected by linear springs without explicit aligning dynamics. In this system, a simple elasticity-based mechanism drives the particles to self-organize by cascading self-propulsion energy towards lower-energy modes. Given its ubiquity, this mechanism could play a relevant role in various natural and artificial swarms.

Spring 2015 Seminars

Date

Title

Author

January 12, 2015

TBA

Kent Ridl

January 19, 2015

Martin Luther King, Jr. Day

January 26, 2015

TBA

Eric Brewe

February 2, 2015

TBA

Aaron Feickert

February 9, 2015


February16, 2015

<Presidents' Day> Engineering Persister-Specific Antibiotics with Synergistic Antimicrobial Functions

Gerard Wong

February 23, 2015

Bruce Rafert

March 2, 2015

APS March Meeting

 

March 9, 2015

March 16, 2015

Spring Break!!

March 23, 2015

TBA

Alec Habig

March 30, 2015

April 1, 2015

<Special Day and Location!!>Structure, Dynamics and Properties of Block Polymer Dispersions

Frank S. Bates

April 6, 2015

Spring Recess

April 13, 2015

April 20, 2015

TBA

Alfredo Alexander-Katz

April 24, 2015

<Special Day!!>TBA

Christos Likos

April 27, 2015

May 4, 2015

TBA

Jessica Striker

May 5, 2015

<Special Day and Location!!>A Robust Nonlinear Block Copolymer Nanoreactor-Based Strategy to Monodisperse Hairy Nanocrystals with Precisely Controlled Dimensions, Compositions and Architectures

Zhiqun Lin

May 11, 2015

Exam Week!

 

 

Structure, Dynamics and Properties of Block Polymer Dispersions

Dr. Frank S. Bates

Regents Professor and Head, Department of Chemical Engineering and Materials Science, University of Minnesota

 

<Special Time!!>Wednesday, April 1, 2015, 3:00-4:00pm (refreshments served 2:30).

<Special Location!!>271 Batcheller Technology Center

Block copolymers belong to a broad class of amphiphilic compounds that includes soaps, lipids and nonionic surfactants. These macromolecules assemble into micelles with molecular dimensions on the order of 5 to 50 nm in size when mixed with excess solvent that preferentially solvates one block type. This presentation will explore two different aspects of block copolymer micelle formation. The fundamental thermodynamic and kinetic factors that control micelle shape and dynamics will be discussed based on small-angle x-ray and neutron scattering (SAXS and SANS) experiments and cryogenic transmission and scanning electron microscopy results. Although the structural features displayed by amphiphilic block copolymers resemble those associated with the self-assembly of lipids and simple surfactants (e.g., spherical and cylindrical micelles and vesicles) a macromolecular architecture leads to remarkably different dynamic properties, linked to a vanishingly small critical micelle concentration. As a consequence, molecular exchange is rapidly extinguished with increasing molecular weight resulting in non-ergotic behavior. These concepts have been exploited in developing a recently commercialized technology that provides immense improvements in the fracture toughness of thermosetting epoxy plastics, which also will be described.

A Robust Nonlinear Block Copolymer Nanoreactor-Based Strategy to Monodisperse Hairy Nanocrystals with Precisely Controlled Dimensions, Compositions and Architecture.

Dr. Zhiqun Lin

Professor, School of Materials Science and Engineering, Georgia Institute of Technology

 

<Special Time!!> Tuesday, May 5, 2015, 3:00-4:00pm (Refreshments will be served at 2:30).

<Special Location!!>271 Bachellor Technology Center

Nanocrystals exhibit a wide range of unique properties (e.g., electrical, optical, and optoelectronic) that depend sensitively on their size and shape, and are of both fundamental and practical interest. Breakthrough strategies that will facilitate the design and synthesis of a large diversity of nanocrystals with different properties and controllable size and shape in a simple and convenient manner are of key importance in revolutionarily advancing the use of nanocrystals for a myriad of applications in lightweight structural materials, optics, electronics, photonics, optoelctronics, magnetic technologies, sensory materials and devices, catalysis, drug delivery, biotechnology, and among other emerging fields. In this talk, I will elaborate a general and robust strategy for crafting a large variety of functional nanocrystals with precisely controlled dimensions (i.e., plain, core/shell, and hollow nanoparticles) by capitalizing on a new class of unimolecular star-like block copolymers as nanoreactors. This strategy is effective and able to produce organic solvent-soluble and water-soluble monodisperse nanoparticles, including metallic, ferroelectric, magnetic, luminescent, semiconductor, and their core/shell nanoparticles, which represent a few examples of the kind of nanoparticles that can be produced using this technique. The applications of these functional nanocrystals in energy-related applications (i.e., solar cells and photocatalysis) will also be discussed.


Student Focused. Land Grant. Research University.

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Published by Department of Physics

Last Updated: Thursday, December 11, 2014 3:26:32 PM