5.3 Solvent cast cellulose diacetate film
Abstract A review of the historical development, manufacture, properties and applications of solvent‐cast cellulose diacetate film.
Materials Literature
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New Alternating Copolyimides by High Temperature Synthesis in Benzoic Acid Medium
The one-pot high temperature catalytic polycyclocondensation of diamines and dianhydrides in molten benzoic acid (BA) was studied. Due to specific features of molten BA as a solvent, obtaining new random and alternating copolyimides (CPIs) becomes possible. Several series of CPIs containing the moieties of different d…
Controlling Surface Composition and Zeta Potential of Chemical Vapor Synthesized Alumina‐Silica Nanoparticles
Abstract Ultrafine alumina–silica powders with varying composition gradients within the particles have been produced by chemical vapor synthesis in a hot‐wall reactor using the precursors tetraethoxysilane (TEOS) and aluminiumtrisecbutylate (ASB). The surface chemistry at the particle/liquid interface in aqueous dispe…
Postsynthesis Stabilization of Free-standing Mesoporous Silica Films
Mixed ammonia-water vapor postsynthesis treatment provides a simple and convenient method for stabilizing mesostructured silica films. X-ray diffraction, transmission electron microscopy, nitrogen adsorption/desorption, and solid-state NMR (13C, 29Si) were applied to study the effects of mixed ammonia-water vapor at 9…
Space charge distribution in low-density polyethylene with blocking layer
Charge carriers injected from the electrode and charge carriers generated in the bulk contribute space charge in low density polyethylene (LDPE). However, it is sometimes difficult to separate their contributions. In this paper, a fluorinated ethylene propylene copolymer (FEP) film was used as a blocking layer. It was…
Charge motion in technical insulators: facts, fancies and simulations
Technical insulators are largely characterised by unipolar ionic flow. The carriers are supplied by injection, or by bulk ionisation, and the charge transport is space charge perturbed. Continuum equations have provided the basis for models of charge flow. First I show the validity of the Deutsch assumption in gases,…
Grazing incidence in-plane X-ray diffraction in the laboratory
The laboratory implementation of grazing incidence in-plane X-ray diffraction, using an unmodified commercial diffractometer, is described. Low resolution, high intensity measurements are illustrated in the study of the in-plane lattice parameters and texture of a thin polycrystalline ZnO film on glass, the in-plane o…
Effects of Thin Mullite Coating on the Environmental Stability of Sintered Si 3 N 4
We investigated the effects of a chemically‐vapor‐deposited mullite coating (∼100 nm) on the oxidation resistance of sintered Si 3 N 4 in air and steam environments. The coating was sacrificially incorporated into the thermally grown oxide (TGO) on Si 3 N 4 during isothermal oxidation in air at 1400°C, leading to sign…
Swelling studies of chitosan-gelatin films cross-linked by sulfate
Swelling properties of chitosan-gelatin films cross-linked by sulfate were investigated. Sulfate cross-linked chitosan-gelatin films (SCG) were prepared simply by dipping chitosan-gelatin films into sodium sulfate solution. The swelling behavior of SCG was investigated as a function of pH and ionic strength. Under aci…
Conversion of an electron–hole plasma into a high density excitonic state in ZnO epitaxial thin films
Time-resolved luminescence spectra of an exciton-exciton scattering process and an electron–hole plasma (EHP) were measured in ZnO epitaxial thin films by the optical Kerr gate method. At moderate excitation density below critical Mott density, stimulated emission of luminescence due to the exciton–exciton scattering…
EXPERIMENTAL AND NUMERICALSTUDIES OF THE COLLAPSE OF THIN TUBES UNDER AXIAL COMPRESSION
EXPERIMENTS ON ALUMINUM TUBES WITH VARYING D/T RATIOS AND THEIR FINITE ELEMENT SIMULATION HAVE BEEN PERFORMED TO STUDY THEIR COLLAPSE MECHANISM AS WELL AS THE LOAD COMPRESSION AND THE ENERGY ABSORPTION RESPONSES. CONVERGENCE STUDIES WITH RESPECT TO MODEL PARAMETERS LIKE LOAD STEP SIZE, MESH DENSITY AND BOUNDARY CONDIT…
Propriedades de filmes comestíveis produzidos com diferentes concentrações de plastificantes e de proteínas do músculo de tilápia-do-nilo
A utilização de proteínas sarcoplasmáticas junto de proteínas miofibrilares pode ser interessante na tecnologia de filmes comestíveis, pois eliminaria o processo de lavagem do músculo no preparo das proteínas. O objetivo deste trabalho foi estudar propriedades físicas de filmes constituídos de proteínas miofibrilares…
Improving Metallic Thermal Protection System Hypervelocity Impact Resistance Through Numerical Simulations
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
A Mathematical Model for Numerical Simulation of Weft Insertion on an Air-Jet Weaving Machine
In air-jet weft insertion, the weft yarn is moved by the frictional drag between the air stream and the yarn surface. This paper reports the computer simulation of this process in order to determine the motion of the yarn during weft insertion. Forces acting on the weft . depend on time as well as the varying position…
Hybrid Numerical Techniques for Power Transformer Modeling: A Comparative Analysis Validated by Measurements
The paper presents alternative numerical techniques implemented in power transformer analysis and design focusing on the short circuit impedance evaluation. The proposed method adopts a particular reduced scalar potential formulation enabling a three-dimensional (3-D) magnetostatic problem solution. This method, requi…
Electrical characterisation of NiO/ZnO structures
Nickel oxide/zinc oxide structures were formed by evaporating Ni onto ZnO and annealing in oxygen. The electrical properties of this nickel oxide layer were investigated by four-point probe measurements and those of the nickel oxide/zinc oxide junction by variable temperature current-voltage (I-V) measurements. NiO la…
Magnetic phase transitions in the iron-doped Pr0.7Ca0.3Mn1−yFeyO3 manganites at high pressures
The atomic and magnetic structures of the iron-doped Pr 0.7 Ca 0.3 Mn 1− y Fe y O 3 manganites ( y =0, 0.1) have been studied at high pressures of up to 4 GPa in the temperature range 16–300 K. At normal pressure, Pr 0.7 Ca 0.3 MnO 3 undergoes a phase transition from the paramagnetic to an antiferromagnetic (AFM) stat…
Toward the Development of Biomimetic Polymers by Protein Immobilization: PEGylation of Insulin as a Model Reaction
Many current tissue-engineering investigations aim at the rational control of cell adhesion and tailored composition of biomaterial surfaces by immobilizing various protein and peptide components, such as growth factors. As a step on the way to develop polymers that allow for such surface modifications, water-soluble…
Porous SiC‐Preforms by Intergranular Binding with Preceramic Polymers
The covalent character of the high performance ceramics used for the fabrication of MMC preforms demands high sintering temperatures to guarantee sufficient interconnection between powder particles. To minimize this cost‐intensive sintering step, several preceramic polymers suitable for binding MMC preform particles w…
An experimental study about the treeing phenomena in XLPE subjected to distorted voltages
In this work the influence of harmonic content of the voltage waveform on electrical treeing growth in XLPE (cross-linked polyethylene) is investigated. In particular the lifetimes of XLPE specimens, having a point plane electrode configuration, subjected to different distorted voltages containing 3/sup rd/, 5/sup th/…