Nanomaterials optical properties

Probing optical properties of nanomaterials

Figure 3. Scanning electron microscopy images of polydisperse nanostructured (upper left) and monodisperse latex (upper right) particles. Example of a hyperspectral (H) polarized BRDF for such media (bottom). λ: Wavelength.

To complement these measurements, 5 we developed numerical tools based on stochastic or radiative transfer approaches. We simulated light scattering in various media—from dense suspensions to coatings—as detected by sensors taking into account the experimental protocol. Then, we compared these results with our own experimental data to determine the value of an objective function. This function is minimized by an iterative process, modifying numerical inputs such as the particle size distribution, the geometry, the concentration, and the optical index of scattering.

Our new instrument is dedicated to measuring the hyperspectral polarized angular signature of various materials, from liquid to solid samples. Measurements are carried out on bulk materials in addition to nanomaterials. We consider the hyperspectral polarized BRDF a powerful new way to study the optical properties of nanomaterials. ls in our numerical models to reduce the error in determining a nanoparticle's optical properties. We are currently evaluating new materials to measure and simulate unexpected optical properties at the nanoscale.

Part of this work was supported by the Région Midi-Pyrénées. The authors wish to thank M.-L. de Solan from the Chemical Engineering Laboratory of Toulouse for helpful discussions and contributions.

World Scientific Publishing Company Optical Properties And Spectroscopy Of Nanomaterials
Book (World Scientific Publishing Company)

Tweaking solar cells w/quantum dots

by Citizen_J

Potential 45% increase in efficiency
Researchers from the University at Buffalo, Army Research Laboratory and Air Force Office of Scientific Research have developed a new, nanomaterials-based technology that has the potential to increase the efficiency of photovoltaic cells up to 45 percent. Specifically, the researchers have shown that embedding charged quantum dots into solar cells can improve electrical output by enabling the cells to harvest infrared light, and by increasing the lifetime of photoelectrons

Engineers develop new materials for hydrogen storage  — R & D Magazine
“We are looking for solid materials that can store and release hydrogen easily,” said Olivia Graeve, a professor at the Jacobs School of Engineering at UC San Diego, who has gained international recognition as a nanomaterials manufacturing expert.

AV Akademikerverlag Useful Optical Properties of Nanomaterials: Theory and Development of Practical Bio-Nanotechnology
Book (AV Akademikerverlag)
The Optical Properties of Polymers for Photonic Applications
Book (Wiley)
American Institute of Physics Transport and Optical Properties of Nanomaterials: Proceedings of the International Conference - ICTOPON-2009 (AIP Conference Proceedings / Materials Physics and Applications)
Book (American Institute of Physics)
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