Materials Literature
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Functionalization of carbon nanotubes (CNTs) is important to increase their solubility and reactivity. This paper investigates possible ways of functionalizing CNTs using the methoxy radical and the secondary butyl anion as initiators and their reactions with ethylene and epoxide, leading to polyethylene- and polyepox…
The correlation between chirality of the B2 and B4 phases was examined by measuring the circular dichroism (CD) in the classic bent-core molecule, P-12-O-PIMB, which shows a direct B2 to B4 phase transition on cooling. Among the various structures formed in the tilted B2 phase, the homochiral SmC S P F and SmC A P A l…
Abstract A novel composite was prepared by ball‐milling crystalline cellulose and maleic anhydride (MA) grafted polypropylene (MAPP) and its characteristics compared with a corresponding composite prepared by a conventional melt‐mixing method. The ball‐milling induces the formation of more ester bonds between cellulos…
Abstract A series of multifunctional cycloaliphatic glycidyl ester and ether epoxy resins were synthesized by reaction of condensed rosin acid‐formaldehyde resins with epichlorohydrin. The chemical structure of the produced resins was determined by IR and 1 H‐NMR analysis. The molecular weight of the produced resins w…
The current status of research on boron-carbon-nitrogen (B-C-N) and boron nitride (BN) nanotubes is presented. The latest achievements in syntheses, analyses and property measurements of these nanoscale tubular architectures are reviewed. The characteristic features of B-C-N and BN nanotubes, compared with conventiona…
Using first principles calculations based on the density functional theory and generalized gradient approximation we show that the ground state of Mn doped ZnO $(10\overline{1}0)$ thin film changes from antiferromagnetic to ferromagnetic when codoped with N. The ferromagnetic coupling between Mn spins arises due to th…
Abstract This article concerns the effectiveness of MAPP as a coupling agent in sisal–polypropylene composites. The fiber loading, MAPP concentration, and fiber treatment time influenced the mechanical properties of the composites. It was observed that the composites prepared at 21 volume percent of fibers with 1% MAP…
Brillouin light scattering experiments from transverse acoustic (TA) and longitudinal acoustic (LA) waves in glycerol have been performed in the temperature range between 170 and $229\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, including both the supercooled and the glassy state of the system. The intensity of light scatte…
By lithographically fabricating an optimised Wheatstone bridge geometry, we have been able to make accurate measurements of the resistance of grain boundaries in Y1-xCaxBa2Cu3O7-d between the superconducting transition temperature, Tc, and room temperature. Below Tc the normal state properties were assessed by applyin…
Extended X-ray Absorption Fine Structure (EXAFS) experiments have been carried out on PrRu$_4$P$_{12}$ and PrOs$_4$P$_{12}$ to study the metal-to-insulator (MI) phase transition in PrRu$_4$P$_{12}$. No Pr displacement was observed across the MI transition temperature from the EXAFS data. Instead, our EXAFS data clearl…
Since the concept of a surface collective excitation was first introduced by Ritchie, surface plasmons have played a significant role in a variety of areas of fundamental and applied research, from surface dynamics to surface-plasmon microscopy, surface-plasmon resonance technology, and a wide range of photonic applic…
Many properties of disordered materials can be understood by looking at idealized structural models, in which the strain is as small as is possible in the absence of long-range order. For covalent amorphous semiconductors and glasses, such an idealized structural model, the continuous-random network, was introduced 70…
We have shown, both experimentally and theoretically, that the metal-induced gap states (MIGS) can exist in epitaxially grown organic insulator/metal interfaces. The experiment is done for alkane/Cu(001) with an element-selective near edge x-ray absorption fine structure (NEXAFS), which exhibits a pre-peak indicative…
We present high-frequency high-field electron paramagnetic resonance (EPR) measurements on the $[{\mathrm{Mn}}_{12}{\mathrm{O}}_{12}{({\mathrm{O}}_{2}\mathrm{C}\mathrm{C}{\mathrm{H}}_{2}\mathrm{Br})}_{16}{({\mathrm{H}}_{2}\mathrm{O})}_{4}∙4\mathrm{C}{\mathrm{H}}_{2}{\mathrm{Cl}}_{2}]$ dodecanuclear manganese complex $…
We study diffusion of self-interstitial atoms (SIAs) in vanadium via molecular-dynamics simulations. The ⟨111⟩-split interstitials are observed to diffuse one-dimensionally at low temperature, but rotate into other ⟨111⟩ directions as the temperature is increased. The SIA diffusion is highly non-Arrhenius. At $T<60…
We present the results of Monte Carlo simulations of the magnetic properties of individual spherical nanoparticles with the aim to explain the role played by surface anisotropy on their low temperature magnetization processes. Phase diagrams for the equilibrium configurations have been obtained, showing a change from…
Abstract Epoxy/clay nanocomposites were prepared by swelling organoclay in an epoxy resin, diglycidyl ether of bisphenol A, followed by curing with an aromatic hardener, diethyltoluenediamine. A combination of X‐ray diffraction with transmission electron microscopy showed the coexistence of intercalated and exfoliated…
The need for spin-injectors having the same zincblende-type crystal structure as conventional semiconductor substrates has created significant interests in theoretical predictions of possible metastable ``half-metallic'' zincblende ferromagnets, which are normally more stable in other structure-types, e.g., NiAs. Such…
To achieve low percolation thresholds in single wall carbon nanotube (SWCNT) and thermoplastic poly(butylene terephthalate) (PBT) composites, we have used an in situ polycondensation reaction process. The intense dispersion process achieved first by ultrasonication and followed by ultrahigh speed stirring of single wa…
Lattice-structural, magnetic, and magnetoelectric (ME) properties have been investigated for single crystals of prototypical polar ferrimagnet ${\mathrm{Ga}}_{2\ensuremath{-}x}{\mathrm{Fe}}_{x}{\mathrm{O}}_{3}$ $(0.8\ensuremath{\leqslant}x\ensuremath{\leqslant}1.4)$ as melt-grown by a floating-zone (FZ) method. Magnet…