A novel method for the characterization of polymers by laser desorption/ionization on the layer of graphene nanoparticles coupled with time-of-flight mass spectrometry was demonstrated. Various polymers including polypropylene glycol, polystyrene and polymethyl methacrylate with average molecular weights from 425 to 3500 Da were analyzed.

A gallium phosphide (GaP) photovoltaic junction is grown by molecular beam epitaxy (MBE) on a GaP substrate. An anti-reflection coating of polymethyl methacrylate (PMMA) is applied and the cell is measured under concentrations of 1 and 10.7 in an outdoor setting. Efficiencies up to 2.6% and open circuit voltages up to 1.57 V are reported. & 2011 Elsevier B.V. All rights reserved.

Microspheres of polymethyl-methacrylate (PMMA) are exciting new soft-tissue fillers that are becoming increasing popular for facial rejuvenation. Some reports of side effects of this procedure are basically in respect to dermal reaction, with late-onset granulomatous lesion with giant cells and vacuoles. We report blindness and total ophthalmoplegia after PMMA injection into glabellar area in a...

1. Applied Physics Program, Northwestern University, Evanston, IL, USA 2. Material Science Division, Argonne National Laboratory, Argonne, IL, USA 3. TechnionIsrael Institute of Technology, Haifa, Israel 4. Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL, USA 5. Energy Science Division, Argonne National Laboratory, Argonne, IL, USA 6. Physics Department, University of C...

In our experiments, we use different photoresists for proton beam writing and mold fabrication. We have fabricated Ni mold with structures down to 500 nm. We first use a fine focused proton beam to expose different photoresists, Polymethyl Methacrylate (PMMA), AR-P 3250 and ma-N 2410. After development and nickel sulfamate electroplating, the structures were faithfully transferred from the phot...

A new methodology describing the effects of aperiodic and multiplexed gratings in volume holographic imaging systems (VHIS) is presented. The aperiodic gratings are treated as an ensemble of localized planar gratings using coupled wave methods in conjunction with sequential and non-sequential ray-tracing techniques to accurately predict volumetric diffraction effects in VHIS. Our approach can b...