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Understanding Viscoelasticity
Radiation damage near grain boundaries
Large-scale molecular dynamics of cascade production of the primary damage state are performed in nanocrystalline nickel with an average grain diameter of 12 nm and primary knock-on atom kinetic energies ranging from 5 to 30 keV. The role of the grain boundary during the cascade production of irradiated NC Ni is discu…
Influence of grain size on tensile properties of Al-Mg alloys
Grain size refinement is an important strengthening mechanism in Al-Mg 5000 series alloys, which have a relatively large Hall-Petch slope compared with other Al alloys. In addition, the high work hardening rate exhibited by Al-Mg alloys provides excellent formability. This paper investigates the influence of grain siz…
The processing of starch as a thermoplastic
Abstract The thermoplastics processing of native starch in the presence of water is a recent development with very wide possible applications. Eventually, oil‐based polymer materials have to be replaced in many applications by sustainable, inexpensive, natural materials from renewable resources. As with conventional t…
The mechanism of adhesion and printability of plasma processed PET films
Of the several techniques available for the surface modification, plasma processing has proved to be very appropriate. The low temperature plasma is a soft radiation source and it affects the material only over a few hundred Å deep, the bulk properties remaining unaffected. Plasma surface treatment also offers the adv…
Revisiting the definition of biocompatibility.
My main conclusion is that the original Williams' definition of biocompatibility still stands with respect to individual materials, but we have to move to more specific definitions within each of the varied applications of biomaterials such as those described above, and more will follow. It is time for the discussion…
Multiscale Modeling of Carbon Nanotube Reinforced Polymer Composites
This article examines the effect of interfacial load transfer on the stress distribution in carbon nanotube/polymer composites through a stress analysis of the nanotube/matrix system. Both isostrain and isostress loading conditions are investigated. The nanotube is modeled by the molecular structural mechanics method…
A Simple Direct Casting Route to Ceramic Foams
A simple direct foaming and casting process using ovalbumin‐based aqueous slurries for fabricating ceramic and metal foams is demonstrated. Foaming of aqueous ceramic slurries and the foam microstructure were seen to be a strong function of slurry rheology. Setting of foams with ceramic solids loading above 20 vol% wa…
Dielectric relaxation spectroscopy of a nematic liquid crystal doped with ferroelectric Sn 2 P 2 S 6 nanoparticles
It was found that doping a nematic liquid crystal (LC) with a small amount of ferroelectric nanoparticles strongly affects the dielectric properties of the system. In particular, adding the ferroelectric particles results in a shift of the absorption bands corresponding to the rotation of liquid crystal molecules arou…
Non-Degradable Biocompatible Polymers in Medicine: Past, Present and Future
Polymers have a long history in medicine. Their uses to date range from traditional applications such as catheters, syringes, blood contacting extra corporeal devices to matrices for drug delivery, cell encapsulation and tissue regeneration. Polymers can be broadly classified on the basis of the reactivity of their ch…
Insulator icing test methods and procedures a position paper prepared by the ieee task force on insulator icing test methods
Test methods for evaluating flashover voltage of ceramic and nonceramic insulators under ice, snow, and cold-fog conditions are recommended. The paper describes the procedure to be followed at various stages of an evaluation test including preparation of the test object, insulator precontamination, ice, snow, and cold…
Effect of pH on the preparation of edible films based on fish myofibrillar proteins
Transparent and flexible edible/biodegradable films were successfully made from myofibrillar proteins of blue marlin meat. The effect of pH of film-forming solutions on film formation, tensile strength (TS), elongation at break (EAB), water vapor permeability (WVP), light transmission, transparency, film solubility, p…
Fabrication of Dense Nanostructured Silicon Carbide Ceramics through Two‐Step Sintering
SiC powder compacts were prepared with Al 2 O 3 , Y 2 O 3 , and CaO powders. By two‐step sintering, fully dense nanostructured SiC ceramics with a grain sizes of ∼40 nm were obtained. The grain size–density trajectories are compared with those of conventional sintering processes.
A Novel Polyacrylamide Magnetic Nanoparticle Contrast Agent for Molecular Imaging using MRI
A novel polyacrylamide superparamagnetic iron oxide nanoparticle platform is described which has been synthetically prepared such that multiple crystals of iron oxide are encapsulated within a single polyacrylamide matrix (PolyAcrylamide Magnetic [PAM] nanoparticles). This formulation provides for an extremely large T…
Effect of Chitosan and Temperature on Spore Germination of Aspergillus niger
Abstract Inhibition of radial growth and spore germination of Aspergillus niger in media with added chitosan were detected. The highest radial growth inhibition (73%) was determined at 24 h with 3 g · L −1 of chitosan, and the percent inhibition of spore germination was 40% after 13 h of inoculation. Further, the CC 5…
Atomic modelling of strengthening mechanisms due to voids and copper precipitates in α-iron
Recently a model has been developed by Osetsky and Bacon to study edge dislocations moving over large distances on the atomic scale. It permits investigation of motion of a dislocation under different conditions of applied shear stress with constant or variable strain rate and temperature, and in the presence of obsta…
Remarkable Effect of Pore Size on the Catalytic Activity of Mesoporous Silica for the Acetalization of Cyclohexanone with Methanol
The catalytic activity of mesoporous silica (MCM-41) for the acetalization of cyclohexanone shows a volcano-shaped dependence on the pore diameter. The diameter of the cyclohexanone molecule is ca. 0.75 nm, while its acetalization with methanol was well accelerated on MCM-41 with a pore diameter of approximately 1.9 n…
Temperature Dependence of Polyelectrolyte Multilayer Assembly
The thicknesses of polyelectrolyte multilayer thin films (PEMs) are reported as a function of deposition temperature and ionic strength. PEMs fabricated at high salt and elevated temperatures are significantly thicker than similar films deposited at room temperature. These trends in the multilayer films are not observ…
Backward wave region and negative material parameters of a structure formed by lattices of wires and split-ring resonators
A structure formed by combined lattices of infinitely long wires and split-ring resonators is studied. A dispersion equation is derived and then used to calculate the effective permittivity and permeability in the frequency band where the lattice can be homogenized. The backward wave region in which both the effective…