Materials Literature
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Abstract In order to study the role of polymer crystallinity, we performed oxygen plasma treatment experiments on amorphous and semicrystalline poly(ethylene terephthalate) (PET) polymers. The samples were treated in weakly ionized, highly dissociated RF oxygen plasma in glow region for different exposure times. We fo…
Effect of the surrounding anisotropic liquid crystal medium on the surface plasmon resonance (SPR) exhibited by concentrated suspensions of gold nanospheres has been investigated experimentally and compared with the Mie scattering theory. The observed polarization-sensitive SPR and the red-shift in the SPR wavelength…
In an attempt to understand why catalytic methods for the growth of boron nitride nanotubes work much worse than for their carbon counterparts, we use first-principles calculations to study the energetics of elemental reactions forming ${\text{N}}_{2}$, ${\text{B}}_{2}$, and BN molecules on an iron catalyst. We observ…
We present a new efficient method for Monte Carlo simulations of diffusion-reaction processes. First introduced by us in [Phys. Rev. Lett., 97:230602, 2006], the new algorithm skips the traditional small diffusion hops and propagates the diffusing particles over long distances through a sequence of super-hops, one par…
We develop a theory of transverse thermoelectric (Peltier) conductivity, α_{xy}, in finite magnetic field -- this particular conductivity is often the most important contribution to the Nernst thermopower. We demonstrate that α_{xy} of a free electron gas can be expressed purely and exactly as the entropy per carrier…
We investigate Ising ferrimagnets on square and simple-cubic lattices with exchange couplings between spins of values S=1/2 and S=1 on neighbouring sites and an additional single-site anisotropy term on the S=1 sites. Based mainly on a careful and comprehensive Monte Carlo study, we conclude that there is no tricritic…
The plasmon resonance of metal nanoparticles can enhance and direct light from optical emitters in much the same way that radio frequency (RF) antennas enhance and direct the emission from electrical circuits. In the RF regime, a typical antenna design for high directivity is the Yagi-Uda antenna, which basically cons…
We report the preparation of sodium alanate, a promising hydrogen storage material, in a thin film form using co-sputtering in a reactive atmosphere of atomic hydrogen. We study the phase formation and distribution, and the hydrogen desorption, with a combination of optical and infrared transmission spectroscopy. We s…
Magneto-optical properties of the ferromagnetic semiconductor GaMnAs are studied in a material-specific multiband tight-binding approach. Two realistic models are compared: one has no impurity band while the other shows an impurity band for low Mn concentrations. The calculated magnetic circular dichroism (MCD) is pos…
Resonant coupling of coplanar waveguides is explored by wrapping proximate shorted ends of the waveguides with micron size ferromagnetic Co90Ta5Zr5 tubes. Ferromagnetic resonance and up to 7 outer surface modes are identified. Experimental results for these contorted rectangular tubes are in good agreement with microm…
We predict that ferroelectric phase can be induced by the strong intrinsic surface stress inevitably present under the curved surface in the high aspect ratio cylindrical nanoparticles of nonferroelectric binary oxides (BaO, EuO, MgO, etc). We calculated the sizes and temperature range of the ferroelectric phase in Ba…
We introduce a modified phase field crystal (MPFC) technique that self-consistently incorporates rapid strain relaxation alongside the usual plastic deformation and multiple crystal orientations featured by the traditional phase field crystal (PFC) technique. Our MPFC formalism can be used to study a host of important…
Peptides are particularly attractive as molecular building blocks in the bottom-up fabrication of supramolecular structures based on self-assembly and have potential in many important applications in the fields of biotechnology and bioengineering. In the first part of this critical review the main categories of peptid…
We present a novel approach for detecting and visualizing graphene oxide (GO) with high contrast on different substrates, including glass, quartz, and silicon. Visualization of GO sheets is accomplished through quenching the fluorescence of a thiophene dye, giving high optical contrast without the need to use interfer…
Nanoparticles rapidly interact with the proteins present in biological fluids, such as blood. The proteins that are adsorbed onto the surface potentially dictate the biokinetics of the nanomaterials and their fate in vivo. Using nanoparticles with different sizes and surface characteristics, studies have reported the…
We report nanoscale patterning of graphene using a helium ion microscope configured for lithography. Helium ion lithography is a direct-write lithography process, comparable to conventional focused ion beam patterning, with no resist or other material contacting the sample surface. In the present application, graphene…
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTEnzymatic Polymer Synthesis: An Opportunity for Green Polymer ChemistryShiro Kobayashi*†‡ and Akira Makino‡View Author Information R & D Center for Bio-based Materials, Kyoto Institute of Technology, Kyoto 606-8585, Japan and Department of Material Chemistry, Graduate School…
A preheated high-temperature environment is believed to be critical for a chemical-exfoliation-based production of graphenes starting from graphite oxide, a belief that is based on not only experimental but also theoretical viewpoints. A novel exfoliation approach is reported in this study, and the exfoliation process…
Impact of draw frame delivery speed, coiler diameter of carding machine and card draft on packing density of yarn and related characteristics of ring spun yarn have been found to be very significant. With the increase in draw frame speed and coiler diameter of card, there is a decrease in helix twist, helix angle, hel…
Abstract Two new hybrids of local anesthetic analogs and polyoxometalates {(Bu 4 N) 2 [Mo 6 O 18 NC 6 H 4 COOCH 3 ] ( 1 ) and (Bu 4 N) 2 [Mo 6 O 18 NC 6 H 4 COOC 2 H 5 ] ( 2 )} have been prepared in high purity and moderate yields using the easy reaction route of [α‐Mo 8 O 26 ] 4– with corresponding aromatic amine hyd…