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Technical Program Technical Program sheets growth, split and roll-up model for the formation of 1-D titanate thin films was proposed. 2008 Nanomaterials: Fabrication, Properties, and 9:30 AM Applications: Processing and Properties Wet Chemical Synthesis of Highly Aligned ZnO Nanowires with Optical Sponsored by: The Minerals, Metals and Materials Society, TMS Electronic, Magnetic, Properties: Jean-Claude Tedenac1; Mezy Aude1; Ravot Didier1; Tichit Didier1; and Photonic Materials Division, TMS: Nanomaterials Committee 1 1 Program Organizers: Wonbong Choi, Florida International University; Seong Jin Gerardin Corinne ; Institut Gerhardt Universite de Montpellier 2 Koh, University of Texas at Arlington; Donna Senft, US Air Force; Ganapathiraman ZnO nanowires have a great commercial stake, due to their physical and Ramanath, Rensselaer Polytechnic Institute; Seung Kang, Qualcomm Inc chemical properties. Many methods have been employed for the growth of ZnO nanomaterials (sputtering, chemical vapour deposition, molecular beam epitaxy, Wednesday AM Room: 273 metal-organic chemical vapour deposition) which greatly improve the crystalline March 12, 2008 Location: Ernest Morial Convention Center quality. However, low cost and simplicity of the synthesis processes are required for commercial applications. The wet chemical synthesis route seems to meet Session Chairs: Pawel Keblinski, Rensselaer Polytechnic Institute; Douglas these requirements, enabling the preparation of high crystal quality and proper Chrisey, Rensselaer Polytechnic Institute growth orientation of ZnO nanowires. Nethertheless, control of the ZnO size, morphology, dimensionality, and self-assembly remains a very important 8:30 AM Invited stake, due to their tight influence on ZnO properties. Efficient control of both Optical Assembly of Nanomaterials: Paul Braun1; 1University of Illinois at nanostructure dimensionality and assembly is obtained by using appropriate Urbana-Champaign synthesis parameters during the seeded growth process. The synthesis of well The assembly of nanomaterials into higher order functional structures aligned nanowires with a perpendicularly growth to the substrate and a high has remained a challenge, even as routes for the synthesis and chemical crystal quality is useful for the study of their physical properties. functionalization of nanomaterials has exploded. As a potential solution, we 9:45 AM believe optically directed assembly may prove to be a powerful route for the Characterization of Electrodeposited Nanocrystalline Al-Mg Powders: assembly of nanomaterials into higher order complex and functional structures. Fereshteh Ebrahimi1; Mahesh Tanniru1; Sankara Sarma Tatiparti1; 1University Through optical holography, we have assembled semiconductor quantum dots of Florida and various ceramic nanoparticles into predefined 2 and 3 dimensional patterns Nanocrystalline aluminum-magnesium alloys were fabricated in the powder within polymeric and multifunctional hosts. Also through optical holography, we form using electrodeposition technique. The electrolyte was oganometallic have formed three-dimensionally patterned polymers and oxides. In both these based and the synthesis was conducted in low oxygen argon atmosphere. XRD systems, the resolution and 3-D control of structure obtained far surpassed that profiles showed that these powders consist of supersaturated fcc-Al(+Mg) obtainable through conventional lithographic routes. In a related project, we have and hcp-Mg(+Al) phases. Compositional analysis using EPMA revealed that utilized laser tweezers to manipulate and assemble ZnS and Au nanoparticles the fcc phase can accommodate up to 20at%Mg, however the hcp phase may inside of a self-assembled photonic crystal, giving us the ability to controllably dissolve as high as 40at% of Al. SEM observations indicated that the hcp-Mg place individual defect states within an ordered photonic lattice. phase develops over the supersaturated fcc-Al phase. TEM studies showed that 9:00 AM both phases consist of nanocrystalline grains. These powders were developed Alkaline-Earth Metal Hexaboride One-Dimensional (1D) Nanostructures: for hydrogen storage applications. Selected powders were hydrogenated at Synthesis and Characterization: Syed Amin1; Shu-you Li2; John Roth3; Terry various temperatures and high pressures. In this presentation the results of Xu1; 1University of North Carolina, Charlotte; 2Northwestern University; characterization before and after hydrogenation will be presented. The financial 3University of Illinois, Chicago support by NSF through grant DMR-0605406 is gratefully appreciated. In this presentation, we report our recent progress on synthesis and 10:00 AM W characterization of alkaline-earth metal hexaboride (MB6, M=Sr, Ba) 1D Influence of Processing Mode on the Nanostructure Development of Flux nanostructures. The MB6 1D nanostructures are appealing candidates for Melted Ag-40at%Cu Alloy: D Aujla1; C. Davy1; P. Kalu1; K. Han2; T. Shen3; E applications such as thermoelectric energy conversion, nanocomposites and D. Alexander3; R. Schwarz3; 1Florida Agricultural and Mechanical University- D nanoelectronics. Catalyst-assisted growth of MB 1D nanostructures was 2 6 Florida State University-College of Engineering; National High Magnetic Field N achieved by pyrolysis of diborane (B 2H ) over alkaline-earth metal oxide (MO) 3 2 6 Laboratory; Los Alamos National Laboratory E or alkaline-earth metal carbonate (MCO3) powders at elevated temperature The need to generate higher magnetic field has led to renewed research (~890-960°C) and low pressure (~165 mTorr). Nickel, gold and palladium are into the development of high strength conductor materials. This paper presents S effective catalytic materials. The as-synthesized MB 1D nanostructures were 6 a comparison of the microstructure, texture and strength in Ag-40at%Cu D characterized by scanning electron microscopy, transmission electron microscopy, alloy fabricated by two methods: drawing and cold rolling. The AgCu alloy A and Raman spectroscopy. Results show that the MB6 nanostructures are single was initially produced by flux melting technique and cast into 25.4 mm rods, crystalline with preferred growth direction along [001]. The MB6 nanostructures and then severely deformed by either method to a true strain of 4.6. Several Y are several tens of nanometer in diameter and up to ten micrometer in length. techniques including scanning electron microscopy, X-ray diffractometry and The growth of these nanostructures involved the vapor-solid growth mechanism. Nanoindentation were utilized in analyzing the material. It was found that both Thermal stability of MB 1D nanostructures has also been studied. A 6 processing method produced nano-composites with alternating Ag and Cu M 9:15 AM laminates on the order of 60 to 200nm in thickness. A correlation was made Synthesis of 1-D Nanostructures of Trititanate Thin Films on a Titanium between the microstructure and strength of the material. The general effect of Metal Flake: Yupeng Guo1; Nam-Hee Lee1; Hyo-Jin Oh1; Cho-Rong Yoon1; processing mode on the mechanical properties of the material is discussed. Kyeongsoon Park1; Sun-Jae Kim1; 1Sejong University 10:15 AM One-dimentsional (1-D) layered trititanate nanotubes, nanoribbons films and Sonochemical Synthesis of Nanostructured Anatase and Study of the self-assembled spherical aggregates were prepared by hydrothermal reacting Ti Kinetics among Phase Transformation and Coarsening as a Function of metal flake with concentrated NaOH solution. A combined TEM, SEM and XRD Heat Treatment Conditions: Leonardo Gonzalez-Reyes1; Isaias Hernández- investigation of the reaction products as the functions of reaction temperature, Pérez2; Francisco Robles Hernandez3; Hector Dorantes Rosales1; Elsa Arce duration, concentration of NaOH solution and post treatment conditions revealed Estrada1; 1Instituto Politecnico Nacional; 2Universidad Autónoma Metropolitana; -3 that the 20-50 nm wide and ca. 1µm long nanoribbons with a 5 mol dm NaOH 3Transportation Technology Center, Inc. aqueous solution at 140°C for 12 h. The 6-8 nm wide and several hundreds The present paper shows that nanostructured anatase can be produced by nanometer long nanotubes are prepared by using 10 mol dm-3 NaOH. Titanate sonochemical synthesis with an average particle size of 6.4nm and a specific surface area of 300m2g-1. The results of microstructure coarsening evolution www.tms.org/annualmeeting.html 223 2008 137th Annual Meeting & Exhibition as well as phase transformation of nanometric anatase to rutile subjected to 11:45 AM different heat treatment conditions are presented. The rates of transformation Magnetic Properties of FePt: A Comparison between Nanodots and from anatase to rutile, critical particle size of transformation anatase to rutile Continuous Thin Film: Gopinath Trichy1; Jagdish Narayan1; 1North Carolina and coarsening are directly related to heat treatment temperature, which in turns State University allows developing a mathematical model to predict particle size evolution. The We report on the synthesis and magnetic properties of L10 ordered FePt developed model can be used to precisely predict particle size for anatase and/or nanodots using pulsed laser deposition (PLD). Size reduction to nanoregime in rutile using exponential like equations similar to those described in the LSW magnetic systems can lead to favorable changes in coercivity, remanence and theory. The exponent of the LSW-like equations went from ~1/8 to ~1/4 as domain reversal mechanisms.
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