Materials Literature
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ABSTRACT: Linear low‐density polyethylene (LLDPE), oriented polypropylene (OPP), polycarbonate (PC), polyethylene terephthalate (PET film and PET bottle), and polyethylene naphthalate (PEN) were stored in a model solution containing 10 flavor compounds at 4, 20, and 40 °C and flavor absorption by the plastic materials…
ABSTRACT: Internal atmosphere modification in fruits and vegetables by surface film coatings depends on film permeability, coating thickness, and fruit surface coverage. Research in this area has been mostly empirical, with unpredictable results and diverse conclusions. To reduce variability, it is necessary to have a…
Hydrogen gas (H 2 ) was used to extract B 2 O 3 coatings from boron carbide (B 4 C) particles, permitting a lower temperature onset of sintering and restricting coarsening via solution and precipitation of B 4 C in B 2 O 3 liquid. Remnant H 2 had to be removed from the furnace before specimens were heated through temp…
A mechanistic model for the kinetics of hydrolysis of α‐tricalcium phosphate (α–Ca 3 (PO 4 ) 2 or α‐TCP) to hydroxyapatite (Ca 10− x (HPO 4 ) x (PO 4 ) 6− x (OH) 2− x or HAp) has been developed. The model is based on experimental hydrolysis rate data obtained using isothermal calorimetry. Analysis of the kinetic data…
Abstract Lanthanum phosphate (LaPO 4 ) powders were synthesized by precipitation with and without excess of phosphate and sintered at 1450° C. Bulk and surfaces of different origin and treatments were investigated using powder x‐ray diffraction, transmission electron microscopy and x‐ray photoelectron spectroscopy. Th…
The s p 3 tight-binding model is used to calculate electronic structures of narrow-gap carbon nanotubes. The curvature effects cause a small energy gap, a one-dimensional parabolic bands, and a shift in the Fermi wave vector. The energy gap is described by the approximate relation E g ≃5| V p p π | b 2 cos (3θ)/16 R d…
A fully integrated on-chip vacuum microtriode using carbon nanotubes as field emitters was constructed laterally on a silicon surface using microelectromechanical systems (MEMS) design and fabrication principles. Each electrode in the triode was made of a hinged polycrystalline silicon panel that could be rotated and…
Abstract Benzylation of sawdust from China fir was carried out to prepare plastics based on natural resources. It was found that thermoplasticity and mechanical properties of the chemically modified wood flour changed with the substitution reaction conditions. By compounding sisal fibers and the plasticized fir sawdus…
We have investigated the Jahn-Teller transition in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ by high-temperature powder neutron diffraction in the low-doping region $(0<x<~0.1).$ The Jahn-Teller transition temperature which is about ${T}_{\mathrm{JT}}\ensuremath{\approx}750\mathrm{K}$…
Abstract Crystalline manganite (γ‐MnOOH) has been synthesized and characterized using x‐ray diffraction and high‐resolution transmission electron microscopy techniques. The surface composition was studied with XPS between pH 0.4 and 11. Special pre‐cooling procedures were developed to keep the manganite/water interfac…
Abstract Phenolic resin/clay nanocomposites were prepared using a suspension condensation polymerization method that was suitable to both novolac and resole. Natural montmorillonite and two kinds of organic modified montmorillonite were adopted to investigate the effect of modification on the final morphology of the n…
In the present work the kinetics of the isothermal quiescent crystallization of the isotactic Poly(1-butene) (i-PB) is analyzed by means of rheological measurements and is used as an internal reference to study the effects of the shear flow. In particular, the flow-induced crystallization of two i-PB samples with diff…
Crystals of synthetic melanothallite, Cu2OCl2, have been prepared by chemical transport reactions. Its crystal structure (orthorhombic, Fddd, a 7.4691(15), b 9.5969(19), c 9.700(2) Å, V 695.3(2) Å3, Z = 8) has been refined to R1 = 0.028 (wR = 0.078; S = 1.180) on the basis of 346 unique observed reflections (|Fo | ≥ 4…
This paper illustrates a new model that enables the estimation of life of polymeric insulation subjected to DC stress, both in the presence and in the absence of voltage polarity inversions. The derivation of the model parameters is based on the results of space charge measurements and accelerated life tests realized…
Article Strain Gradient Crystal Plasticity: Thermomechanical Formulations and Applications was published on August 1, 2002 in the journal Journal of the Mechanical Behavior of Materials (volume 13, issue 3-4).
Abstract This study deals with the surface and electrochemical characterization of mild steel surfaces after plasma‐enhanced chemical vapour deposition of organosilicon films, performed in order to increase corrosion resistance. Coating deposition was performed in a home‐made reactor with hexamethyldisiloxane–oxygen–a…
In Sweden, high-level radioactive waste will be disposed of in a canister with a copper outer container and a cast iron or carbon steel insert. If the iron insert comes into contact with anoxic geological water, anaerobic corrosion leading to the generation of hydrogen will occur. This paper presents a study of the an…
Uncharged water-soluble porphyrins were prepared by reaction between tetrakis(p-hydroxyphenyl)porphyrin and chlorinated poly(ethylene glycol) methyl ethers of different molecular weights. Water-solubility was achieved by binding four poly(ethylene glycol) branches to a porphyrin core to give star polymers with molecul…
A model of the geometry of flat braids is proposed, based on coding of the braid topology and on the minimum energy principle for the yams. The description of the geometry also takes into account minor effects, such as side crimp and yam twisting induced by skewness of the structure. The model is compared with results…
Currently, there is a major upsurge in research on the use of recyclable and biodegrad able materials in manufactured products. This has triggered a need for biodegradable nonwovens for nearly forty automotive interior components, which currently contain traditional materials such as glass and other manufactured fiber…