Materials Literature
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Time-resolved luminescence spectra of ZnO epitaxial thin films were measured by the optical Kerr gate method in femtosecond time regime under resonant excitation of the excitonic state. We observed the relaxation of hot carriers until the buildup of luminescence due to an electron–hole plasma (EHP) state and recovery…
A thermodynamic description of the Bi–In–Sb ternary system of lead-free solder alloys using the CALPHAD (Calculation of Phase Diagram) method is presented. Phase equilibria information such as vertical sections, liquidus projection and thermochemical quantities were calculated and compared with the experimental data.…
An automatic method has been developed with digital image analysis. The method uses background from the fuzz and pills on the textile with an automatically generated Fourier mask. An evaluation feature is calculated from values enclosed in the power spectrum by the Fourier mask. The image analysis evaluation results a…
(CoFeB)-(Si01.9) and CoFeB films were fabricated by synchronous triple RF magnetron sputtering with rotating a cylindrical electrode. Three types films for RF application in the range over 1 GHz were obtained, and these permeability characteristics and micro-structures were investigated.The as-deposited films exhibite…
The biocompatibility and degradation characteristics of cross-linked high amylose starch (Contramid were investigated in rats over 4 months. Contramid pellets (3-mm diameter and thickness) obtained by direct compression, were implanted subcutaneously and intramuscularly. On sequential time points, macroscopic observat…
The nonlinear shear rheology of a hyperbranched polyisobutylene (PIB) with narrow molecular weight distribution (Mw/Mn=1.3) was compared to that of a polydisperse (Mw/Mn=2.5) linear PIB. After adjusting the respective measurement temperatures to yield equal shear viscosities, the rheology was found to be quite similar…
Polyamide (nylon 6) fabrics have been treated with tetrafluoromethane low temperature plasma and then dyed with commercially available acid and disperse dyes. The morphology of the treated surfaces has been examined by scanning electron microscopy and chemical surface changes characterised by X‐ray photoelectron spect…
This paper discusses the theory, modeling, design, fabrication and preliminary test results of the MEMS loop heat pipe being developed at the Center for Microelectronic Sensors and MEMS at the University of Cincinnati. The emphasis is placed upon the silicon micro wick and its production through a novel technique know…
Abstract Crystal structures of 1,2-bis(2,4-dimethyl-3-thienyl)perfluorocyclopentene 1a, 1,2-bis(2,4,5-trimethyl-3-thieny)per-fluorocyclopentene 2a and their mixture were determined by X-ray crystal structure analysis and their photochromic reactivities were compared. In the crystal of 1a, 17 mol% of molecules adopted…
The synthesis and magnetic properties of two new hexanuclear iron complexes [Fe6O2(OH)2(O2CR)10L2] (R = But (3), Me (4); LH = 2-(2-hydroxyethyl)pyridine (hepH) (3), 6-methyl-2-(hydroxymethyl)pyridine (Me-hmpH) (4)) are reported. Both compounds are prepared by treatment of [Fe3O(O2CR)6(H2O)3]+ with three equivalents of…
A simplified theoretical model has been proposed to predict optical parameters such as thickness, thickness irregularity, refractive index, and extinction coefficient from transmission spectra. The proposed formula has been solved for thickness and thickness irregularity in the transparent region, and then the refract…
Abstract. Shape memory alloys (SMAs) constitute a unique class of materials that undergo a reversible phase transformation allowing the material to display dramatic stress-induced and temperature-induced deformations which are recoverable. Nickel Titanium (NiTi) SMA has be synthesized with refined grain size by a mech…
AlCu solid-solution alloys were dealloyed by immersion in alkaline solution to produce a high surface density of copper nanoparticles, simulating the region around a cathodic intermetallic phase in an industrial AlCuMg alloy. The cathodic behavior of the copper-enriched surface in neutral chloride or sulfate solutions…
Certain isotropic and anisotropic media with negative permittivity and/or permeability parameters have been recently labeled as BW-media due to their capability of supporting backward waves. Various suggestions for constructing composite materials realizing such media (also called metamaterials) have also been recentl…
This paper describes model-based, active control of an aftertreatment system for a spark ignition engine equipped with a three-way catalyst (TWC) and pre- and post-TWC oxygen sensors. A controller is designed to manage the oxygen storage level in the TWC in order to maximize the simultaneous conversion efficiencies of…
Gd(III) complexes are under intense scrutiny as contrast agents for magnetic resonance imaging (MRI). They act by enhancing tissutal proton relaxation rates. Much has already been done in order to get an in-depth understanding of the relationships between structure, dynamics, and contrastographic ability of these para…
Abstract Poly(hexano-6-lactone) (PCL*) fibers were enzymatically degraded by a hydrolase in vitro. The extent of degradation of PCL fibers was examined by weight loss, mechanical properties loss such as tensile strength and ultimate elongation decreases, and visual observations by scanning electron microscopy. The in…
iii ACKNOWLEDGMENTS vi TABLE OF CONTENTS ix LIST OF FIGURES xiii LIST OF TABLES xix CHAPTER 1: INTRODUCTION 1 CHAPTER 2: BACKGROUND 8 Structure of Carbon Nanotubes 11 Methods of Nanotube Fabrication 17 Mechanical Properties of Carbon Nanotubes 22 Modulus 22 Strength 24 Carbon Nanotube-Reinforced Polymers 28 Issues rel…
A fiber-optic thermometer is developed based on the temperature dependence of the afterglow phosphorescence intensity which is dominated by the thermal excitation of trapped carriers using long duration phosphor, The intensity of afterglow phosphorescence from the long phosphorescent sensor head increases greatly and…
The miscibility and phase behavior of poly(ethylene oxide) (PEO) blends with poly(3-hydroxybutyrate) (P(3HB)), poly(3-hydroxypropionate) (P(3HP)), and poly(3-hydroxybutyrate- co -3-hydroxypropionate)s (P(3HB- co -3HP)s) have been investigated by differential scanning calorimetry (DSC) and high-resolution solid-state 1…