InterNano Nanomanufacturing Repository
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Diamond Nanoparticles as a Support for Pt and PtRu Catalysts for Direct Methanol Fuel Cells
No full textBiofilm Conductivity is a Decisive Variable for High-current-density Geobacter Sulfurreducens Microbial Fuel Cells
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Control of Lipid Oxidation by Nonmigratory Active Packaging Films Prepared by Photoinitiated Graft Polymerization
No full textTransition metal-promoted oxidation impacts the quality, shelf life, and nutrition of many packaged foods. Metal-chelating active packaging therefore offers a means to protect foods against oxidation. Herein, we report the development and characterization of nonmigratory metal-chelating active packaging. To prepare the films, carboxylic acids were grafted onto the surfaces of polypropylene films by photoinitiated graft polymerization of acrylic acid. Attenuated total reflectance/Fourier transform infrared spectroscopy, contact angle, scanning electron microscopy, and iron-chelating assay were used to characterize film properties. Graft polymerization yielded a carboxylic acid density of 68.67 +/- 9.99 nmol per cm(2) film, with ferrous iron-chelating activity of 71.07 +/- 12.95 nmol per cm(2). The functionalized films extended the lag phase of lipid oxidation in a soybean oil-in-water emulsion system from 2 to 9 days. The application of such nonmigratory active packaging films represents a promising approach to reduce additive use while maintaining food quality
Co-deposition of Pt and Ceria Anode Catalyst in Supercritical Carbon Dioxide for Direct Methanol Fuel Cell Applications
No full textPt and mixed Pt-ceria catalysts were deposited onto gas diffusion layers using supercritical fluid deposition (SFD) to fabricate thin layer electrodes for direct methanol fuel cells. Dimethyl (1,5-cyclooctadiene) platinum (II) (CODPtMe2) and tetrakis (2,2,6,6-tetramethyl 3,5-heptanedionato) cerium (IV) (Ce(tmhd)(4)) were used as precursors. Hydrogen-assisted Pt deposition was performed in compressed carbon dioxide at 60 degrees C and 17.2 MPa to yield high purity Pt on carbon-black based gas diffusion layers. During the preparation of the mixed Pt-ceria catalyst, hydrogen reduction of CODPtMe2 to yield Pt catalyzed the deposition of ceria from Ce(tmhd)(4) enabling co-deposition at 150 degrees C. The catalyst layers were characterized using Xray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope-energy dispersive spectral (SEM-EDS) analyses. Their electrochemical performance toward methanol oxidation was examined in half cell mode using a three electrode assembly as well as in fuel cell mode. The thin layer electrodes formed via SFD exhibited higher performance in fuel cell operations compared to those prepared by the conventional brush-paint method. Furthermore, the Pt-ceria catalyst with an optimized composition exhibited greater methanol oxidation activity than pure platinum. (C) 2012 Elsevier Ltd. All rights reserved
Sustainable and Scalable Nanomanufacturing a Key Focus of 2012 Summit in Boston
No full textOn the eve of next week's Nanomanufacturing Summit and 11th Annual NanoBusiness Conference in Boston, I'd like to take pause and reflect upon the synergistic events and interactions that have been taking place over the past several years positioning us for the nanomanufacturing revolution. While nanomanufacturing has often been a misunderstood topic or discipline within the broader topic of nanotechnology, it has gained substantial attention in recent years. Most notable has been the PCAST report on the assessment of the National Nanotechnology Initiative (NNI) in 2010, providing key recommendations for future directions in which it cited the need for increased funding and emphasis on nanomanufacturing, commercialization, and effective technology transfer. Soon thereafter, the NNI Signature Initiative on Sustainable Nanomanufacturing was announced. The goal of this interagency initiative is to establish manufacturing technologies for economical and sustainable integration of nanoscale building blocks into complex, large-scale systems.
Also included: California in the Nano Economy, A Small-Scale Solution With a Large-Scale Impact, and NanoBusiness Announces Top 2012 Nanotech Innovator
Floating Gate Memory via Additive Driven Assembly: Opportunities for Device Fabrication using Solution Processing and Roll-to-Roll Manufacturing
No full textWe have used additive driven self-assembly to create the active device layer for floating gate memory. This approach, which allows for very high loadings of 2 nm gold nanoparticles in a polystyrene-block-poly(vinyl pyridine) block copolymer, offers theoretical storage capacities competitive with current flash memory devices. To achieve high storage densities in devices, device level patterning at micron and smaller length scales is required. We are currently pursuing the device patterning via roll-to-roll (R2R) nanoimprint lithography. These technologies will enable the production of memory and other devices using low cost, sustainable, nanomanufacturing