InterNano Nanomanufacturing Repository
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Hierarchical Superhydrophobic Surfaces Fabricated by Dual-Scale Electron-Beam-Lithography with Well-Ordered Secondary Nanostructures
No full textUsing metal nanostructures to form hydrocarbons from carbon dioxide, water and sunlight
No full textBased on experimental results, we propose a mechanism that allows the use of metal nanostructures to synthesize hydrocarbons and carbohydrates from carbon dioxide, water and sunlight. When sunlight impinges on cobalt nanostructures in a glass chamber, its intensity is greatly enhanced around the tips of the nanostructures through surface plasmon excitations focusing effect, and it then photodissociates the water and carbon dioxide molecules through enhanced photon absorptions of ions around the tips of the nanostructures. The photodissociated molecules in excited states remain on the cobalt nanostructure surfaces and various hydrocarbons and carbohydrates then will be formed around the surfaces at temperatures much lower than 100C
Nanomanufacturing Summit 2011 Provides Focus on Commercialization, Manufacturing Innovations, and Emerging Research
No full textThe Nanomanufacturing Summit 2011, held this past week in Boston, provided some high level discussions with focus on, amongst other topics, nanotechnology commercialization, translational research emerging from academic research centers, and manufacturing innovations. In the first event wherein the NNN has teamed with the NanoBusiness Commercialization Association, key topics also included nanoEHS, Patents and Intellectual Property, Regulation, Nanomedicine, Green Manufacturing, and Commercialization strategies and successes. With a broad emphasis on the success of investments made by the Federal Government in the first 10 years of the National Nanotechnology Initiative (NNI), keynote speakers Sally Tinkle, Acting Director of the National Nanotechnology Coordination Office (NNCO), and Mihail Roco, Senior Advisor for Nanotechnology at the National Science Foundation (NSF), provided information regarding the formation of strategic plans within the NNI, including the recently published EHS strategy, which was developed through a series of workshops and public comment. Reiterating the increased emphasis on effective technology transfer from fundamental research to product commercialization, and nanomanufacturing, the growing trends impacting future economic development and job creations were also cited, with estimates that nanotechnology commercialization will create 6 million jobs by 2015, with 2 million of these located inside the U.S.
Also included: UMass Amherst Nanotechnology Center Receives 20 Million to Fund U.S. University Research on Nanoelectronics for 2020 and Beyond, and Stabilized Nanostructure Composites for Nonvolatile Memory Device Application
Reusable biocatalytic crosslinked microparticles self-assembled from enzyme-nanoparticle complexes
No full textEmulsions stabilized by enzyme-nanoparticle (NP) complexes were used to fabricate robust biocatalytic scaffolds after core solidification via crosslinking. These biocatalysts feature ease of formation, high retention of enzymatic activity and reusability
Block copolymer self-assembly in chemically patterned squares
No full textThe self-assembly of block copolymers thin films laterally confined within square geometries that are incompatible with the bulk packing symmetry of the block copolymer microdomains is investigated. The lateral confinement is provided by chemical patterns made by oxidation nanolithography of octadecyltrichlorosilane-coated silicon surfaces. We find that the size and shape of the confinement affect the order of the block copolymer microdomains and their packing symmetries. Specifically, if the size of the square pattern is smaller than the characteristic grain size the hexagonally packed microdomains form a single-crystal oriented along the edges of the pattern and with "edge-boundaries" located preferentially at the perimeter of the pattern. If the size of the pattern is comparable with the natural bulk period of the copolymer, the packing symmetry changes from hexagonal to square. In this case the ordering induced by the pattern edges becomes dominant allowing the square lattice to be more stable than the hexagonal one
Direct patterning of quantum dot nanostructures via electron beam lithography
No full textPatterned quantum dot (QD) nanostructures were prepared by direct electron beam lithography on QD films. Time resolved photoluminescence measurements show that the optical properties of these QDs were retained after cross-linking
Hole Nucleation and Growth in Free-Standing Polystyrene Ultrathin Films
No full textNucleation and growth of holes in free-standing ultrathin (s 100 nm) polymer films are examined via optical microscopy in order to gain a better understanding of these phenomena. Hole nucleation is quantified with a free energy barrier based on a simple capillary model. Additionally, holes are found to grow exponentially in accordance with previous studies in the literature. Ultrathin films of polystyrene (between 50 and 100 nm) cast via flow coating are suspended atop lithographically patterned arrays of pillars. The films are then annealed above the glass transition temperature to study the nucleation and growth of holes via optical microscopy. Image analysis is performed to measure the density of nucleated holes as well as hole radius as a function of time. Holes are found to grow exponentially with time in a nonlinear viscoelastic, shear thinning regime under high shear strain. The energy barrier model is applied to the nucleation of holes in free-standing thin films and is found to describe the phenomenon well. This analysis of hole nucleation and growth extends the understanding of ongoing research into suspended fiber formation from the melting of free-standing polymer thin films
