Alternative Energy

Exploiting Equilibrium Properties for Assembly of Core/Shell-Like Compound Semiconductor Nanocrystals

Nov 9, 2010

Sumeet C. Pandey

Typical synthesis of core/shell nanostructures involves a rigorous two-step protocol. It is common to synthesize the semiconducting core first, followed by the overgrowth of a thin shell of a different band-gap material. The few attempted single-step and one-pot synthesis approaches have been...

Evidence for High-Efficiency Exciton Dissociation at Poly(3-hexylthiophene)/Single-Walled Carbon Nanotube Interfaces in Planar Nano-Heterojunction Photovoltaics

Nov 9, 2010

Geraldine LC Paulus

There is significant interest in combining carbon nanotubes with semiconducting polymers for photovoltaic applications due to potential advantages from smaller exciton transport lengths and enhanced charge separation. However, to date, bulk heterojunction (BHJ) devices have demonstrated relatively...

Understanding and Controlling Organic-Inorganic Interfaces in Mesostructured Titania/Conjugated Polymer Materials for Photovoltaic Applications

Nov 9, 2010

Justin P. Jahnke

The use of surfactant-directed mesostructured inorganic materials allows for the preparation of oxide frameworks as continuous transparent films with high inorganic-organic interfacial contact and the inclusion of diverse functional guest species. For example, mesostructured (10 nm) titania films...

Using Supercritical Fluids for CdS and CdTeS Nanoparticle Decorated TiO2 Nanostructures

Nov 9, 2010

Paul A. Charpentier

Abstract: TiO2 nanowires were sensitized with CdS and CdTeS quantum dots which were grown using an in situ colloidal method using both conventional organic solvents and supercritical carbon dioxide (scCO2). No pretreatment of the TiO2 nanowires was required prior to nanoparticle generation. The...

Hot Electron Transfer From Semiconductor Nanocrystals

Nov 9, 2010

William A. Tisdale

Cu(In,Ga)Se2 (CIGS) and CuIn(SeS)2 (CISS) Nanocrystals and Their Use as Printable Photovoltaic Media and Medical Imaging Contrast Agents

Nov 9, 2010

Dariya K. Reid

We have developed the colloidal synthesis of I-III-VI2 semiconductor nanocrystals of Cu(In,Ga)Se2 (CIGS) and CuIn(SeS)2 (CISS). These nanocrystals can be spray-deposited into photovoltaic devices (PVs) with power conversion efficiencies of up to 3% without the use of high temperature annealing...

Modeling & Optimization of Dye Sensitized Solar Cells with Core/Shell Nanowire Array-Based Photoanodes

Nov 9, 2010

Justin J. Hill

The benefits of utilizing nanowire-based photoanodes for dye sensitized solar cells is quickly becoming apparent. Nanowire structures allow for the presence of an interfacial electric field that is otherwise absent in nanoparticle-based dye sensitized solar cells (DSSCs). This electric field...

Solution-Grown CuInSe2 Nanowires for Low-Cost Photovoltaics

Nov 9, 2010

Chet Steinhagen

A semiconductor media that could be printed under ambient conditions by a roll-to-roll process on plastic substrates to fabricate photovoltaic devices (PVs) would greatly reduce the cost of solar cell manufacturing. One approach is to create “paints” or “inks” of nanocrystals that can be deposited...

Transitioning to Low Carbon Power Generation by Integrating Renewables with Fossil Energy

Nov 7, 2010

Michael Matuszewski

It is expected that environmental regulations will be enacted to restrict the amount of carbon emissions from today's power plants. As such, it is likely that carbon capture and sequestration (CCS) technologies will be added to both new and existing coal-fired power plants to achieve compliance...

Biological Synthesis of Fuels and Chemicals

SBE Webinar

Jul 22, 2010

James Liao

Global energy and climate problems have stimulated increased efforts in synthesizing fuels and chemicals from renewable resources.

Gasification: Opportunities and Challenges

AIChE Webinar

Apr 21, 2010

Shuncheng Ji

This webinar gives an overview of global and domestic (U.S.) applications and current markets for gasification technologies.

Autothermal Reforming of Ethanol in a Fluidized Bed Membrane Reactor for Ultra-Pure Hydrogen Production

Mar 23, 2010

Fausto Gallucci

In recent years, many efforts have been made to develop processes and reactor technologies for the production of cheap, ultra-pure hydrogen that can be used in efficient PEM fuel cells. Nowadays, hydrogen is mainly produced by steam reforming of natural gas in multi-tubular reactors. The main...

Hydrogen Production by Reforming of Logistic Diesel Fuel in Supercritical Water

Mar 23, 2010

Carsten Cremers

Compared with other fuels, diesel fuels still have significant advantages in terms of logistic properties such as energy density, availability and ease of handling. However, diesel fuels also have their draw backs. For an example, the only established technology to convert the chemical energy of...

Burgeoning Prospects for Waste-to-Energy in the United States

AIChE Webinar

Mar 10, 2010

Marco Castaldi, Ted Michaels

In this session, we take an in-depth look at federal legislation and regulations currently under consideration, and examine what potential impacts they will have on waste-to-energy.

An Integrated Waste Management System for a Sustainable Society

AIChE Webinar

Feb 24, 2010

Brian Bahor, QEP, Marco Castaldi

What are the hallmarks of an effective integrated was.te management system? How do we best create one for a sustainable society?

Waste Management: From Major Environmental Problem to Source of Materials and Energy

AIChE Webinar

Jan 27, 2010

Dr. Nickolas J. Themelis, Marco Castaldi

This webinar discusses the principal means for dealing with what has become a major environmental issue.

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