Materials Literature
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Geopolymer apron cassava starch/BC/Fe3O4/glycerin has been synthesized for various amount of Fe3O4 (0.5%, 1%, and 1.5%) into cassava starch and black carbon (BC) solutions. The quantitative analysis from Fourier transforms infra-red (FTIR) was used to determine the optical properties, dielectric function, energy loss…
Aluminum is highly abundant in the Earth's crust where it is present in a wide variety of primary and secondary aluminosilicate minerals, amorphous phases, and aqueous solution species. The speciation and coordination of AI in many of these phases, particularly those that are X-ray amorphous or present as thin surface…
TiCl4 or titanium isopropoxide reacted with citric acid to form a titanyl citrate precipitate. Barium strontium citrate solutions were then added to the titanyl citrate reaction to form gels. These gels were dried and calcined to (Ba,Sr)TiO3 powders. The gels and powders were characterized by DSC/TGA, IR, SEM and XRD…
Pt I~u and Ln-edges XANES clarified the oxidation state of platinum catalysts supported on various metal oxides. The acidbase property seemed one of the most dominant factors to control the electron state of platinum. On the reduced samples, there was a tendency that acidic support reduced the 5d-electron density of p…
The temperature coefficient of the dielectric permittivity (τϵ) and resonant frequency (τf) of perovskites and related materials is important in the application of these ceramics to microwave filters and resonators. Recent work has directly related changes in τϵ, and therefore τf, to the onset of octahedral tilting in…
Changes in fabric structure as hygroscopic fibers swell at high humidities can have a large influence on the measured air permeability of fabrics such as cotton, wool, silk, and nylon. The variation of air permeability as a function of relative humidity is of practical importance in ranking and evaluating candidate te…
The contributions of transformation toughening and microcrack toughening in an 85Al 2 O 3 15ZrO 2 (vol%) composite were quantitatively evaluated. Three types of hot‐pressed samples with similar size (∼0.5 µm) and size distribution of ZrO 2 grains, but with different contents (vol%) of monoclinic‐ ( m ‐) ZrO 2 (0 (AZS)…
First-principles calculations based on the generalized gradient corrected density-functional theory reveal that iron tetraoxide $({\mathrm{FeO}}_{4}),$ in spite of its closed-shell structure, has an electron affinity that is larger than that of any known halogen atom. This novel property is shown to be a manifestation…
The complex dielectric permittivity of right-handed isooctyloxycyanobiphenyl (IOOCB) has been studied in the frequency range 10 -1 −10 5 Hz and over a wide temperature range. On cooling the isotropic liquid a supercooled liquid is formed that becomes a glass below 220 K. On heating the glass, the material crystallized…
The conductivity, electronic properties and morphology of polypyrrole and polyaniline films deposited from aqueous solutions of the polymerizing monomer differ greatly according to whether they are deposited on a hydrophobic or hydrophilic substrate surface. For each polymer the conductivity of the film deposited on a…
The rheology of concentrated, aggregated colloidal suspensions is determined through particulate simulations. Aggregating systems experience a large viscous enhancement over nonaggregating systems, this being due to the increase in the component of the viscosity arising from the repulsive colloid (thermodynamic) force…
Abstract A novel nematic liquid crystal display of in‐plane switching controlled by fringe‐field has been developed. The device exhibits wide viewing angle over 160° and high transmittance comparable to the twisted nematic TN cell, a solution for long standing problem of previous wide viewing angle technologies with l…
Duplex stainless steels (DSS) of 25% Cr-7% Ni-x% Mo-y% W-0.25% N (x = 1.5 to 3, and y = 0 to 3) were designed with the same pitting resistance equivalent (PRE) value of 42 by varying the contents of Mo and W. Effects of W on pitting and stress corrosion of the solution-annealed or aged alloys in chlorides were examine…
Abstract A black-filled styrene-butadiene rubber (SBR) vulcanizate was ambiently ground, then used as an additive to the original, uncured compound. Sheets of the resulting composite (matrix/ground rubber particulate) were cured, and tensile and trouser tear strength determined. The composite had reduced tensile stren…
The applications of advanced engineering materials in modern vacuum electronic devices are reviewed. Unique materials with desirable thermal, mechanical, electrical, and magnetic properties are playing a crucial role in raising the average power capability, bandwidth, and efficiency of microwave and millimeter wave am…
An efficient method, which is called the "inverse distribution function method", for calculating the magnetic field strength H from the flux density B through the Preisach model is developed. By using the method, H can be directly obtained without iteration from B which is calculated by the usual FEM, with the magneti…
The effects of circular holes and sharp notches on the tensile strength of two Nicalon‐reinforced ceramic composites have been investigated. The influence of inelastic straining on the redistribution of stress has been elucidated through measurements of the local strains in the regions of high stress concentration, co…
Abstract— Fluorescence quantum yields and singlet lifetimes for a wide range of hydrophilic to hydrophobic porphyrins and metalloporphyrins have been determined in toluene, methanol or acetone. Photosensitized singlet oxygen yields have been determined in the same solvents. For some porphyrins, the same quantities wer…
Long- and short-range structural order of nanocrystalline ZnO films grown using single source chemical vapor deposition (SS-CVD) of basic zinc acetate Zn 4 O(CH 3 COO) 6 have been investigated. The addition of a low background pressure of H 2 O during SS-CVD provides a mechanism for varying the structural properties t…
We investigate the optical transmission fingerprints in structures that exhibit deterministic disorders. A class of models that has attracted particular attention in this context are the quasiperiodic dielectric multilayers that obey a substitutional sequence. These substitutional sequence are characterized by the nat…