Materials Literature
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# Introduction: # Historical Background to Polymer Physics and Description of Polymer Physics Areas # Chain Statistics: # The Chain Character of Polymers Modeled on Probability Considerations, Lattice Theory of Blending Polymers # Thermodynamics: # Classical and Statistical Thermodynamic Models Applied to Polymers # O…
Polarized Raman scattering and infrared reflectivity measurements have been used to investigate the crystal structure of Czochralski-grown NaLaF4 single crystals. The phonon symmetries, the simultaneous presence of polar modes in the infrared and Raman spectra, as well as the observation of piezoelectric resonance, he…
Effects of an uniaxial compressive pre-stress on the dielectric properties of normal and relaxor ferroelectric ceramic composites in BT-PZT and PMN-PZT systems are investigated. The dielectric properties are observed under the compressive pre-stress levels up to 15 and 5 MPa for BT-PZT and PMN-PZT, respectively, using…
The objective of the present chapter1 is to provide the basic concepts and tools required to understand the inception and development of cavitation in liquid flows. The influence of various parameters as the boundary layer and nuclei content is discussed. A special attention is given to thermal effects which may signi…
Abstract Photoconductivity of ZnO single crystals grown by a hydrothermal method for ultraviolet light was measured. The ZnO single crystals have photo response in a range of wavelengths shorter than 380 nm. O‐faces of ZnO single crystals of the c ‐plane showed higher photocurrents and wider spectral response than did…
A process for deposition of silicon oxycarbonitride films from poly(urea)methyl vinyl silazane (PUMVS) by spin coating precursor solutions onto a substrate, followed by polymerization, cross‐linking and pyrolysis has been developed. The cross‐linked polymer films (350 nm thick), deposited on variety substrates (e.g.,…
O estudo e aplicação de poliésteres bioreabsorvíveis para reparar tecidos danificados tem se mostrado uma área de pesquisa muito promissora. Poli (L-ácido láctico), PLLA, se destaca dentre os poliésteres bioreabsorvíveis, em função de características como biocompatibilidade e bioreabsorção. No entanto, seu alto custo…
The potential of active brazing filler metal modification by ceramic particle addition, with the aim of reducing the stresses in ceramic‐metal joints is studied. A layered braze structure is proposed: layers of reinforced and un‐reinforced filler are combined in an optimal manner to minimize residual stress. The joint…
The Eu3+-doped zinc oxyfluorotellurite (TZLFE) glass of molar composition 59TeO2–20ZnO–20LiF–1Eu2O3 has been prepared and studied by broadband, Raman, and fluorescence-line narrowing (FLN) spectral techniques to investigate the local environments of Eu3+ ions in this glass. From the vibronic spectra, different TeO gro…
The lanthanide-doped GdF3nanoparticles have been produced by a simply hydrothermal synthesis procedure. The excitation and emission spectra of the Eu3+-doped GdF3nanoparticles showed that the excitation energy of Gd3+is efficiently transferred to Eu3+in the Eu3+-doped GdF3nanoparticles. Due to very low phonon energies…
Nylon-6 fibers with average diameters below 500 nm were electrospun onto conventional air filter media at varying weight coverage levels using a multi-nozzle bank. The initial filtration efficiency of the air filter media was improved significantly with increasing coverage level and decreasing size of nylon-6 fibers.…
An experimental comparison of the performance of single- and double-layer planar lens lithography has been carried out. A direct comparison is made with a single 50 nm silver lens and a double silver lens with two 30 nm layers. Sub-diffraction-limited features have been imaged in both cases, with dense grating periods…
Polymorph farming on a chip is a promising for rapid polymorph discovery by transforming crystallization-crystal isolation-characterization Into one time-efficient step.
Abstract ZnO/GaN p‐i‐n heterojunctions light emitting diodes were fabricated by plasma‐assisted molecular beam epitaxy. We make use of high resistivity of nitrogen doped ZnO to fabricate n‐ZnO/i‐ZnO/p‐GaN heterojunction light emitting diode. The emission of i‐ZnO was obtained due to the limitation effect of i‐ZnO on e…
Chaos is present in non-linear systems that describe temporal phenomena in the physical and life sciences. Well-known instances of chaos include the logistic map, the Lorenz equations, and forced non-linear oscillators. The regular and chaotic dynamics of free gas bubbles and gas-encapsulated microbubbles (contrast ag…
This article reviews the current understanding of the miscibility of binary blends composed of polyethylenes, including high-density polyethylene, low-density polyethylene, and linear low-density polyethylenes prepared with the use of Ziegler-Natta and metallocene catalysts. It has been generally found that difference…
Hyper-Raman scattering, the nonlinear (two-photon excited) analogue of ordinary Raman scattering, is usually considered to be a weak process that requires high-energy pulsed laser excitation. The sensitivity can be improved greatly by making use of two-photon electronic resonance and/or electromagnetic field enhanceme…
Highly reflective front-surface silver mirrors are needed for many optical applications. While various protective dielectric coating schemes have been developed, the long-term durability of Ag mirrors is still of great concern in the optics community for a variety of applications under harsh environments. The corrosio…
Abstract The effect of the molecular structure of xylan on its assembly onto softwood kraft pulps was investigated. Various xylan-rich fractions were isolated from birch wood chips by different mild treatments using water (H 2 O), acetic acid (HAc) and sulfur dioxide (SO 2 ). The isolation involved prehydrolysis follo…
The scientific and applied corrosion literature has been reviewed in order to establish the state of the art knowledge on the general corrosion of copper. Based on the evaluation of electrochemical fundamentals of corrosion processes and the chemical composition of solid corrosion byproducts on internal pipe surfaces,…