Materials Literature
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We use a confocal microscope to examine the motion of individual particles in a dense colloidal suspension. Close to the glass transition, particle motion is strongly spatially correlated. The correlations decay exponentially with particle separation, yielding a dynamic length scale of O(2-3 sigma) (in terms of partic…
The surface oxidation of polyethylene (PE) and the surface reduction of Teflon (FEP) were studied with regard to the surface topography of the film samples that were used and the resulting water wettability. Anodized aluminum membranes were used as nanomolds to impart fibrillar topographies to the polymer surfaces. Wa…
A glass is usually formed by cooling a liquid at a rate sufficient to avoid crystallization. In the vicinity of the glass transition the structural relaxation time increases with lowering temperature in a non-Arrhenius fashion and the structural relaxation function reveals a non-Debye behaviour. However, liquid can be…
The atomic structure and charge redistribution of different terminations of $\mathrm{Ba}\mathrm{Zr}{\mathrm{O}}_{3}$ (011) surfaces have been studied using density functional simulations. We found that the O-terminated (011) flat surface had the smallest cleavage energy among (011) surfaces, but this value was still t…
Abstract Electrospinning of poly ( L ‐ D ‐lactic acid) (PLA) was investigated with the addition of multi‐walled carbon nanotubes (MWNT) for development of a scaffold for tissue engineering. Through this experiment, it was determined that the optimal concentration of PLA with weight average molecular weight ( M w ) 250…
Evidence for the molecular-scale origin of the suppression of physical ageing in confined polymer: fluorescence and dielectric spectroscopy studies of polymer–silica nanocomposites, Priestley, Rodney D, Rittigstein, Perla, Broadbelt, Linda J, Fukao, Koji, Torkelson, John M
Electrochromic tungsten oxide (WO 3 ) thin films with nanometer-scale porosity have been synthesized via a sol−gel procedure making use of evaporation-induced self-assembly. According to wide-angle X-ray scattering data combined with electrochemical analyses, the degree of crystallinity ranging from fully amorphous to…
Fluorescent probes 1 and 2 were prepared directly from tetramethyl-BODIPY via palladium-mediated C-H functionalization reactions.
Many polymers exhibit extremely high fragility and deviate from most of the trends known for non-polymeric glass-forming systems. The analysis of literature data presented here demonstrates that chain rigidity might be the main reason for this peculiar behaviour. Based on this analysis a simple scenario is proposed: (…
A combination of DSC, SAXS, WAXD, 1 H time-domain, and frequency domain NMR measurements was used for determining the amount of rigid/crystallinity, semirigid, and soft fractions of iPP. Changes in the rigid, semirigid, and soft fractions of isotactic polypropylene (iPP) were investigated as a function of temperature,…
Abstract A series of polystyrene (PS)/SiO 2 nanocomposites were prepared. Silica nanoparticles with an average diameter of 16 nm were used, and treated with dimethyldichlorosilane, while their weight fraction varied from 4 up to 10%. The viscoelastic‐thermomechanical properties of the nanocomposites and their interrel…
Responding to the need for a single reference source on the design and applications of composites, Composite Materials: Design and Applications, Second Edition provides an authoritative examination of the composite materials used in current industrial applications and delivers much needed practical guidance to those w…
We describe a method to analyze the effects of shrink fitting and stamping on the mechanical stress distribution and iron loss in motor cores. Shrink fitting and stamping are important processes in manufacture of motor cores from electrical steel. The mechanical stress distribution is evaluated by a structural finite-…
Abstract The effects of polymer molecular weight and temperature on the physical aging of poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) is examined. Gas permeability and refractive index were monitored during the aging process for PPO film samples at three aging temperatures below the glass transition temperature. Comp…
The observed height distribution of clusters obtained in strained epitaxy has been often interpreted in terms of electronic effects. We show that some aspects can be explained classically by the interplay of strain and edge energies. We find that soft materials can transform directly from monolayer into thicker island…
The electronic structure of nanowires in contact with metallic electrodes of experimentally relevant sizes is calculated by incorporating the electrostatic polarization potential into the atomistic single particle Schrödinger equation. We show that the presence of an electrode produces localized electron/hole states n…
We use a standard Monte-Carlo algorithm to study the slow dynamics of a binary Lennard-Jones glass-forming mixture at low temperature. We find that Monte-Carlo is by far the most efficient way to simulate a stochastic dynamics since relaxation is about 10 times faster than in Brownian Dynamics and about 30 times faste…
We tailor the shape and phase of the pump pulse spectrum in order to study the coherent lattice dynamics in tellurium. Employing the coherent control via splitting the pump pulse into a two-pulse sequence, we show that the oscillations due to A1 coherent phonons can be cancelled but not enhanced as compared to single…
Spin-dependent phenomena in ZnO may lead to devices with new or enhanced functionality, such as polarized solid-state light sources and sensitive biological and chemical sensors. In this paper, we review the experimental results on transition metal doping of ZnO and show that the material can be made with a single pha…
Molecular engineering of multilayered composites by layer-by-layer assembly (LBL) made possible easy replication of mechanical properties of nacre. Taking advantage of the ability of LBL to finely control the structure of the composite, one can further improve the mechanical properties of the multilayers, e.g., increa…