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Topic Area: Nanomaterials

Displaying records 91 to 100 of 158 records.
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91. Challenges in Continuum Modeling of Intergranular Fracture
Topic: Nanomaterials
Published: 2/11/2010
Authors: Valerie R. Coffman, James P. Sethna
Abstract: Intergranular fracture in polycrystals is often simulated by finite elements coupled to a cohesive-zone model for the interfaces, requiring cohesive laws for grain boundaries as a function of their geometry. We discuss three challenges in understandi ...

92. Applications of Thermogravimetric Analysis in Quality Control of Single-Walled Carbon Nanotubes
Topic: Nanomaterials
Published: 2/1/2010
Authors: Elisabeth Mansfield, Aparna Kar, Stephanie A Hooker
Abstract: Carbon nanotube exhibit a range of chemistries, including mixtures of different nanotube diameters, lengths and chiralities, coupled with various concentrations of metallic and non-nanotube carbon impurities. The performance of a given material for ...

93. Laser Patterning of Diamond. Part II. Surface Nondiamond Carbon Formation and its Removal
Topic: Nanomaterials
Published: 12/30/2009
Authors: Daniel A Fischer, John Smedley, Trvini Rao, Cherno Jaye, Jen Bohon
Abstract: As diamond becomes more prevalent for electronic and research applications, methods of patterning diamond will be required. One such method, laser ablation, has been investigated in a related work.1 We report on the formation of surface non-diamond c ...

94. Size Measurement of Nanoparticles using Atomic Force Microscopy
Topic: Nanomaterials
Published: 10/1/2009
Authors: Jaroslaw Grobelny, Frank W DelRio, Pradeep Narayanan Namboodiri, Doo-In Kim, Vincent A Hackley, Robert Francis Cook
Abstract: In this assay protocol, procedures for dispersing gold nanoparticles on various surfaces such that they are suitable for imaging and height measurement via intermittent contact mode AFM are first described. The procedures for AFM calibration and ope ...

95. Optical Properties of Rod-like Metallic Nanostructures: Insight from Theory and Experiment
Topic: Nanomaterials
Published: 9/3/2009
Authors: Jinsong Duan, Kyoungweon Park, Robert I. MacCuspie, Richard A Vaia, Ruth Pachter
Abstract: In this work, we combined synthesis of metal Au and Au-Ag core-shell NRs, of high-purity and for a broad range of NR aspect ratios, with theoretical prediction, in order to gain an understanding of the optical response. Self-assembled NRs were also ...

96. Origin of Universal Optical Conductivity and Optical Stacking Sequence Identification in Multilayer Graphene
Topic: Nanomaterials
Published: 8/6/2009
Authors: Hongki Min, Allan H. MacDonald
Abstract: We predict that the optical conductivity of normal graphene multilayers is close to {sigma}^duni^=({pi}/2) e^u2^/h per layer over a broad range of frequencies. The origin of this behavior is an emergent chiral symmetry which is present in normal N-l ...

97. Depressed Phase Transition in Solution-Grown VO2 Nanostructures
Topic: Nanomaterials
Published: 7/1/2009
Authors: Daniel A Fischer, Luisa Whittaker, Cherno Jaye, Zugen Fu, Sarbajit Banerjee
Abstract: The first-order metal insulator phase transition in VO2 is characterized by an ultrafast several orders of magnitude change in electrical conductivity and optical transmittance, which makes this material an attractive candidate for the fabrication of ...

98. Asphaltene Adsorption onto Self-Assembled Monolayers of Mixed Aromatic and Aliphatic Trichlorosilanes
Topic: Nanomaterials
Published: 6/2/2009
Authors: Daniel A Fischer, Saloman Turgman-Cohen, Mathew Smith, P K Kilpatrick, Jan Genzer
Abstract: The adsorption of asphaltenes onto flat solid surfaces modified with mixed self-assembled monolayers (SAMs) of aliphatic and aromatic trichlorosilanes with varying wettabilities, aromaticities, and thicknesses is tested. The mixed SAMs are characte ...

99. Modification of PET surfaces with self-assembled monolayers of organosilane precursors
Topic: Nanomaterials
Published: 5/13/2009
Authors: Daniel A Fischer, Ali Ozcam, Kirill Effimenko, Cherno Jaye, Richard Spontak, Jan Genzer
Abstract: We report on a facile, robust and rapid method by which poly(ethylene terephthalate) (PET) surfaces can be chemically modified while avoiding chemical degradation. Specifically, we demonstrate that brief exposure of PET surfaces to ultraviolet/ozone ...

100. Near Edge X-Ray Absorption Fine Structure Spectroscopy Studies of Single-Crystalline V2O5 Nanowire Arrays
Topic: Nanomaterials
Published: 5/7/2009
Authors: Daniel A Fischer, J Velasquez, Cherno Jaye, S Banerjee
Abstract: Near edge X-ray absorption fine structure (NEXAFS) spectroscopy is used to precisely probe the alignment, uniformity in crystal growth direction, and electronic structure of single-crystalline V2O5 nanowire arrays prepared by a cobalt-catalyzed vapor ...

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