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Electrodeposition of Nanoengineered materials - 208th Electrochemical Society Meeting

作者： Vasilic, R. Dimitrov, N. Materials Science and Engineering Program SUNY- Binghamton Binghamton NY 13902 United States Department of Chemistry SUNY- Binghamton Binghamton NY 13902 United States

ISBN: (纸本)9781566774925

The development of a new method for epitaxial growth of metals in solution by galvanic displacement of layers pre-deposited by underpotential deposition (UPD) is discussed and experimentally illustrated. Cyclic Voltammetry and Scanning Tunneling Microscopy are employed to carry out and monitor a "quasi-perfect", two-dimensional growth of up to 35 monolayers (MLs) of Ag on Au(111) by repetitive galvanic displacement of underpotentially deposited Tl and Pb monolayers. A comparative study emphasizes the displacement stoichiometry as an efficient tool for thickness control during the deposition process and as a key parameter that affects the deposit morphology, The excellent quality of layers deposited by monolayer-restricted galvanic displacement is manifested by a steady UPD voltammetry and ascertained by a flat and uniform surface morphology maintained during the entire growth process. An X-ray Photoelectron Spectroscopy analysis finds no traces of Pb in the Ag deposit. copyright The Electrochemical Society.

关键词： Silver

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Fabrication and Defect Designs on DNA Linked 2D Colloidal Photonic Crystals Using a Nd:YAG Pulsed Laser

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MRS Online Proceedings Library 2006年第1期901卷 1-6页

作者： Ramazan Asmatulu Sejong Kim Robin Bright Phillip Yu Fotios Papadimitrakopoulos Harris Marcus Department of Materials Science and Engineering Institute of Materials Science University of Connecticut Storrs USA Department of Chemistry Nanomaterials Optoelectronics Laboratory Polymer Program Institute of Materials Science University of Connecticut Storrs USA

Controlled defects were created on DNA linked 2-D colloidal photonic crystals using a Nd:YAG pulsed laser. The 2-D photonic crystals were self-assembled using 1.8 μm polystyrene (PS) microspheres on functionalized glass substrates. To synthesize the hexagonal close packed crystalline samples, both substrate and particles attached single-strand DNA, sequence A on the substrate and sequence B on the particles. The DNA was hybridized using the DNA linker with complementary single-strand A’B’ that anchored the particles to the substrate during self-assembly. The 532 nm second harmonic wavelength beam of the pulsed Nd:YAG laser (1064 nm) with a pulse width of 10 ns was used for the removal of individual colloidal particles from the self assembled photonic crystals. In the present tests, the diameter of the laser beam was optically reduced from 7 mm to about 1.8 μm. Controlled line defects and geometrical shapes (e.g., hexagonal and triangle) were created in the 2D arrays in an aqueous medium.

关键词： colloid crystal laser

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Low-temperature sintered LZSA cellular glass ceramics

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6th Pacific Rim Conference on Ceramic and Glass Technology, PacRim6

作者： Sousa, E. Rambo, C.R. Hotza, D. De Oliveira, A.P. Novaes Fey, T. Graduate Program on Materials Science and Engineering - PGMAT Department of Chemical Engineering - EQA Federal University of Santa Catarina P.O. Box 476 88040-900 Florianópolis SC Brazil Department of Materials Science Glass and Ceramics University of Erlangen-Nuremberg Martensstrasse 5 D-91058 Erlangen Germany

ISBN: (纸本)0470080507

Commercial polyurethane foams with a monomodal pore size distribution were used to produce LZSA glass ceramic foams by the polymeric sponge method. A suspension containing LZSA glass ceramic, bentonite and sodium silicate, was prepared in water and isopropanol media to impregnate the polymeric foams by dip coating. The suspension was characterized by Theological measurements. The effect of the solvent on the microstructure and physical properties on the LZSA foams was also evaluated. The cellular microstructure of the glass-ceramic foams was characterized by scanning electron microscopy (SEM) and micro-computer X-ray tomography (μ-CT). The LZSA foam prepared with isopropanol suspension exhibited higher mechanical strength under compression than those prepared with water.

关键词： Glass ceramics

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Investigation of damage evolution and residual stress in the Ti6Al4V-Al3Ti metal intermetallic laminate (MIL) composites

Investigation of damage evolution and residual stress in the...

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2006 International Conference on Powder Metallurgy and Particulate materials, PowderMet 2006

作者： Li, Tiezheng Olevsky, Eugene A. Vecchio, Kenneth S. Meyers, Marc A. Department of Mechanical and Aerospace Engineering Materials Science and Engineering Program University of California San Diego San Diego CA 92093-0411 United States Department of Mechanical Engineering San Diego State University San Diego CA 92182-1323 United States

ISBN: (纸本)9780976205760

The damage evolution and the residual stresses in metal (Ti6Al4V) intermetallic (Al3Ti) laminate (MIL) composites were investigated. The MIL composites (volume fractions of Ti6Al4V: 14%, 20% and 35%) were tested under perpendicular, different strains (1%, 2%, 3%), different strain rates (0.0001/s and 800-2000/s). The specimens under each testing condition were then observed under SEM. Differences in crack propagation and damage evolution in MIL composites under dynamic (800-2000/s) and quasi-static (10-4/s) compression were observed. The crack density was measured using optical microscopy for each testing conditions. The effect of cracking on the stress-strain relation was evaluated and compared with the experimental data. The residual stress during the processing was simulated by analytical modeling and by using finite element software and the results were compared with experimental results.

关键词： Residual stresses

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Processing and characterization of epoxy/SWCNT/woven fabric composites

Processing and characterization of epoxy/SWCNT/woven fabric ...

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47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and materials Conference

作者： Thakre, Piyush R. Lagoudas, Dimitris C. Zhu, Jiang Barrera, Enrique V. Gates, Thomas S. Materials Science and Engineering Program Department of Aerospace Engineering Texas A and M University College Station TX 77840 United States NanoRidge Materials Inc. Houston TX 77023 United States Department of Mechanical Engineering and Materials Science Rice University Houston TX 77005 United States NASA Langley Research Center Mechanics of Structures and Materials Branch Hampton VA 23681 United States Aerospace Engineering 3141/TAMU United States AIAA United States NanoRidge Materials Inc. 2315 Schlumberger St. Houston TX 77023 United States Mechanical Engineering and Materials Science 1892/RICE United States Mechanics of Structures and Materials Branch MS188E United States

ISBN: (纸本)1563478080

The objective of the proposed paper is to present a processing technique, test methods, experimental results, and manufacturing concerns related to mechanical performance of composite laminates with selective reinforcement using single walled carbon nanotubes (SWCNTs). Vacuum assisted resin transfer molding (VARTM) was used to fabricate woven carbon fabric-epoxy matrix composite laminates with localized placement of SWCNTs. The interlaminar shear strength of 8 harness satin weave carbon-epoxy composite was studied using short beam shear test and microscopy. The composites were manufactured with the nanotubes placed in the laminate mid-plane. Both pristine (non-functionalized) and functionalized SWCNTs were used in the mid-plane and compared to laminates without any nanotubes. The interlaminar shear strength was found to be improved by using functionalized nanotubes with little or almost no improvement for the case of the pristine nanotubes. Microscopic investigation of crack initiation and propagation is presented using results from optical and scanning electron microscopy. Copyright © 2006 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Epoxy resins

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Characterizations of trimetallic heteronuclear Bi1-xLa x[Fe(CN)6]·n(H2O) complexes and their thermal decomposition products

Characterizations of trimetallic heteronuclear Bi1-xLa x[Fe(...

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作者： Aono, Hiromichi Kondo, Nobuyuki Katagishi, Haruo Kurihara, Masato Sakamoto, Masatomi Sadaoka, Yoshihiko Department of Materials Science and Engineering Faculty of Engineering Ehime University Matsuyama 790-8577 Japan Graduate Program of Human Sensing and Functional Sensor Engineering Graduate School of Science and Engineering Yamagata University Yamagata 990-8560 Japan Department of Material and Biological Chemistry Faculty of Science Yamagata University Yamagata 990-8560 Japan

Heteronuclear Bi1-x La x [Fe(CN)6] &middotnH2O complexes were synthesized, and their crystal structures and thermal decomposition process were investigated by X-ray diffraction (XRD), thermogravimetry analysis (TG... 详细信息

Heteronuclear Bi1-x La x [Fe(CN)6] ·nH2O complexes were synthesized, and their crystal structures and thermal decomposition process were investigated by X-ray diffraction (XRD), thermogravimetry analysis (TGA), Auger electron spectroscopy (AES) with scanning electron microscope (SEM), and transmission electron microscopy (TEM). The crystal system of the complexes was orthorhombic having n = 4 for x = 0-0.7 and was hexagonal having n = 5 for x = 1.0. Their mixture was confirmed for x = 0.8 and 0.9. The lattice parameters for the orthorhombic increased with increasing the x value for the complexes. The single phase of trimetallic perovskite-type Bi1-x La x FeO3 was obtained by its thermal decomposition at low temperature. The crystal system was hexagonal for BiFeO3 (x = 0) and orthorhombic for x = 0.1-1.0. In the case of the decomposed perovskite sample, the lattice parameters decreased with increasing x values for Bi1-x La x FeO3. The particle size was ca. 30 nm for Bi0.2La0.8FeO3 obtained by thermal decomposition at 500 °C and it grew with an increase in decomposition temperature. For the Bi0.5La0.5FeO 3, AES showed that the elemental distributions of Bi, La, and Fe on the surface were very homogeneous for the sample decomposed at 700 °C.

关键词： Bismuth compounds

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Properties of the surface-modified layer of plasma-oxidized poly(dimethylsiloxane)

Properties of the surface-modified layer of plasma-oxidized ...

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2006 MRS Spring Meeting

作者： Mills, Kristen L. Zhu, Xiaoyue Lee, Donghee Takayama, Shuichi Thouless, M.D. Department of Mechanical Engineering University of Michigan Ann Arbor MI 48109 United States Department of Biomedical Engineering University of Michigan Ann Arbor MI 48109 United States Macromolecular Science and Engineering Program University of Michigan Ann Arbor MI 48109 United States Department of Materials Science and Engineering University of Michigan Ann Arbor MI 48109 United States

ISBN: (纸本)1558998810

Exposure of poly(dimethylsiloxane) (PDMS) to oxygen plasma creates a thin, stiff surface-modified layer that reaches a submicron depth. Due to a significant modulus mismatch between the stiff surface-modified layer and the compliant bulk PDMS the surface-modified layer forms intricate patterns of surface buckles when under compressive stress and nano-cracks when under tensile stress. It is desirable to be able to design patterns of nano-cracks, or at least to have an understanding of them. Among the properties necessary to do this are the thickness and elastic modulus of the surface-modified layer. Due to the very small length scale of the surface-modified layer, it is a significant challenge to measure these properties. In this proceedings paper, a two-step method is described for determining the thickness and elastic modulus of the surface-modified layer using the atomic force microscope (AFM). First, nanoindentation is performed from which the bending stiffness of the surface-modified layer is calculated. Second, the surface-modified layer thickness is determined by using phase imaging on the cross-section of oxidized PDMS to map the region of the relatively stiffer surface-modified layer. © 2006 materials Research Society.

关键词： Silicones

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Vertically aligned carbon nanotube field emission devices fabricated by furnace thermal chemical vapor deposition at atmospheric pressure

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Journal of Vacuum science and Technology B: Microelectronics and Nanometer Structures 2006年第3期24卷 1190-1196页

作者： Wei, S. Kang, W.P. Davidson, J.L. Choi, B.K. Huang, J.H. Interdisciplinary Program in Materials Science Vanderbilt University Nashville TN 37235 Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 Department of Materials Science and Engineering National Tsing Hua University Hsinchu 300 Taiwan

Multiwalled carbon nanotubes (CNTs) grown by thermal chemical vapor deposition (CVD) in a tube furnace at atmospheric pressure are reported. The CNTs were synthesized at 750 °C using C2 H2 as the carbon source and a mixture of Ar H2 (80 vol %:20 vol %) as a carrier gas, with N H3 serving as a processing reagent. The catalytic properties of nickel (Ni) particles are strongly affected by the CVD process parameters and this effect is reflected in the morphologies and field emission behaviors of the as-grown CNTs. The flow rate ratio of N H3 to C2 H2 is found to be critical to the formation of vertically aligned CNTs, which demonstrated better field emission characteristics than the randomly oriented nanotubes. The successful synthesis of vertically aligned CNTs at atmospheric pressure in a tube furnace is beneficial for large area mass production such as flat panel field emission displays at lower cost. © 2006 American Vacuum Society.

关键词： Field emission displays

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World's first pure Fabry-Perot diaphragm fiber optic sensor (DFOS)

World's first pure Fabry-Perot diaphragm fiber optic sensor ...

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Optical Fiber Sensors, OFS 2006

作者： Chin, Ken K. Feng, G. Georgiou, George E. Guo, Kanzhu Sun, Yan Niver, Edip Roman, Harry Department of Physics NJIT United States Department of Physics Rutgers University-Newark Campus United States Materials Science and Engineering Program NJIT United States ECE Department NJIT United States PSE and G Corporation Newark NJ United States

A critical test is proposed to determine if a diaphragm fiber optic sensor (DFOS) is interference or intensity based. Using the criterion, the first purely Fabry-Perot DFOS has been designed, fabricated with MEMS tech... 详细信息

ISBN: (纸本)1557528179

关键词： Diaphragms

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Self-healing composites

Self-healing composites

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SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006

作者： Plaisted, Thomas Nemat-Nasser, Sia Center of Excellence for Advanced Materials Materials Science Program University of California San Diego 9500 Gilman Drive San Diego CA 92093-0416 Center of Excellence for Advanced Materials Department of Mechanical and Aerospace Engineering University of California San Diego 9500 Gilman Drive San Diego CA 92093-0416

ISBN: (纸本)091205395X

A material that can heal its damage is of great utility where access for manual repair is limited or impossible, as in a biological implant or a material that is launched into orbit in the solar system. Structures made of such a material may have significantly prolonged service life in addition to improved safety if damage, such as cracking, can be repaired in-situ. We focus on a novel self-healing polymer, which is strong, tough, and forms a high degree of thermally reversible, covalent cross-links. Mechanical failure of this polymer occurs preferentially along these cross-links, and due to the reversible nature of this bond it may be repaired by application of moderate pressure and heat. We have produced this polymer and have shown its healing ability experimentally, using compression-induced stable cracking of relatively long and slender samples of rectangular cross section containing a central hole, with cracks made to grow in the compression direction axially along the length of the specimens. These cracks are then healed and the test is repeated. In this manner the fracture strength and healing efficiency of the sample is experimentally measured.

关键词： Composite materials

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