This session was webcast at Pittcon 2012 in Orlando, Florida on Monday, March 12, 2012.

TITLE: Transport in 30-Nanometer Wide Electrochemical Cells

SPEAKER: Henry S White

ABSTRACT OVERVIEW: The role of high-field Coulomb transport in electrochemical cells where the electrodes are separated by nanometer-wide electrolytes will be described. In order to quantitatively compare computational and experimental transport results as a function of electrolyte thickness in the sub-100 nm regime, it is necessary to employ thin-film methods that enable definition of the electrolyte volume with nanometer thickness resolution. We chose atomic layer deposition (ALD) of electrically insulating Al2O3 films as the method to confine and define the cell geometry, as ALD enables deposition with ~2-nm spatial resolution. In this application, 5 to 100-nm thick Al2O3 layers must display negligible electrical leakage currents, relative to the electrolyte of interest, in order to obtain meaningful i-V data corresponding to electrolyte transport. The schematic below shows one cell with a 30-nm-separation gap between the electrodes. Electrochemical data using this cell to study transport of redox molecules in ionic liquids and organic electrolytes will be presented and compared to predictions based on finite element simulations.

Duration : 0:31:15

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Technorati Tags: Award, Charles N Reilley, chemistry, Conference, Electrochemical, Exposition, Orlando Florida, Pittcon 2012

mg.com/vi/-09boe11dEg/0.jpg” align=”left”/>Dr Andrea Sella of the chemistry department at University College London explains why things appear white to us and shows us the whitest material in the world.

Duration : 0:3:7

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Technorati Tags: alom, Andrea, chemistry, colour, dioxide, optics, Sella, shaha, TiO2, titanium, UCL, white

Computer simulations of a stage of diatom morphogenesis. In the video there are real and simulated images of some diatom species. In the simulated images, the dark parts correspond to organic-rich regions which eventually can act as templates for the subsequent deposition of silica. The physico-chemical model adopted in the simulations is based on a phase-separation mechanism. For more info follow the link to the relevant scientific publication
http://pubs.acs.org/cgi-bin/abstract.cgi/langd5/2008/24/i01/abs/la702278f.html

Duration : 0:2:4

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Technorati Tags: chemistry, computer, diatoms, edinburgh, fortran, phase, physics, publication, science, Separation, simulations

http://www.SimpleChemConcepts.com
Welcome to www.SimpleChemConcepts.com.

You have learnt about the 3 States of Matter – Solid, Liquid & Gas. We have also learnt about the physical processes that changes one state to another. e.g. Melting, Evaporation, Boiling, Condensation, Freezing, etc..

Sublimation is a very special process which changes the solid state directly into the gaseous state without going through Melting process (i.e. without going through the liquid state).

In this video, we share with you one of the everyday life examples that such Chemistry Phenomenons are observed.

This is Solid Carbon Dioxide, and in general we call it as Dry Ice. Dry Ice is a classic example that we observe sublimation process to occur. The solid carbon dioxide changes directly into gaseous carbon dioxide, without going through the liquid state.

Dry Ice is commonly used to keep Ice-Cream cold and solid by ice-cream vendors. Do you have any idea why we don’t use normal ice (made of water) to keep ice cream cold?

For more Chemistry Tips, Strategies & Phenomenons, please visit us at www.SimpleChemConcepts.com

Duration : 0:0:43

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Technorati Tags: chemistry, Education, OLevelChemistry, science, sublimation, Theories, Tips

The incorporation of a CH3 radical into the 2×1 {100} diamond surface

Duration : 0:1:32

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Technorati Tags: chemistry, CVD, Diamond