Materials Literature
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Magnetic and dielectric properties of a polycrystalline GaFeO 3 sample prepared by a solid-state reaction have been investigated. A ferrimagnetic phase transition T N of the material was identified at a temperature of 225 K. An anomaly on the permittivity as a function of temperature has been observed near its magneti…
We present results of our study of polarized Raman scattering and infrared reflectivity of rhombohedral ceramic ${\mathrm{La}}_{1\ensuremath{-}y}{\mathrm{Sr}}_{y}{\mathrm{Mn}}_{1\ensuremath{-}x}{M}_{x}{\mathrm{O}}_{3}$ manganites in the temperature range between 77 and $320\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. In ou…
Biofouling is the undesirable adhesion and development of microorganisms and macroorganisms in a water environment. An electrochemical antifouling system based on management of primary adhesion of microorganisms was developed employing titanium electrode for antifouling of seawater cooling pipes and marine infrastruct…
The photoluminescence spectrum of a quasimonodisperse semiconductor quantum dot (QD) population is composed of a continuum of extremely narrow single QD spectra. This is due to inhomogeneities in nanocrystal size within a population and the color-size dependency imposed by effects of carrier quantum confinements. We t…
Eu3+-doped zinc aluminate (ZnAl2O4) nanorods with a spinel structure were successfully synthesized via an annealing transformation of layered precursors obtained by a homogeneous coprecipitation method combined with surfactant assembly. These spinel nanorods, which consist of much finer nanofibres together with large…
Electron spin resonance and magnetization data in magnetic fields up to $55\phantom{\rule{0.3em}{0ex}}\mathrm{T}$ of a multicenter paramagnetic molecular complex $[{L}_{2}{\mathrm{Ni}}_{4}({\mathrm{N}}_{3}){({\mathrm{O}}_{2}\mathrm{C}\mathrm{Ada})}_{4}](\mathrm{Cl}{\mathrm{O}}_{4})$ are reported. In this compound, fou…
Abstract The dissolution behavior of polyrotaxanes, consisting of α‐cyclodextrin and poly(ethylene glycol), with different molecular weights (2000 and 35,000) was investigated. Halogen‐containing ionic liquids, such as chlorides or bromides, were found to be good solvents for polyrotaxanes, regardless of their cations…
Abstract In the electrospinning process submicron‐diameter polymer fibers can be produced when a high potential difference is applied to a polymer drop suspended at the tip of a capillary. The electrospinning process is affected by a wide range of parameters, because of which controlling the properties of the fibers i…
We report experiments of electron spin resonance (ESR) of ${\mathrm{Cu}}^{2+}$ in polycrystalline samples of ${\mathrm{CaCu}}_{3}{\mathrm{Ti}}_{4}{\mathrm{O}}_{12}$ post-annealed in different atmospheres. After being synthesized by solid state reaction, pellets of ${\mathrm{CaCu}}_{3}{\mathrm{Ti}}_{4}{\mathrm{O}}_{12}…
Abstract Summary: Superhydrophobic surfaces are generated by a simple one‐step method of electrospinning of fluorinated homopolymers and copolymers of PFS. The hydrophobicity and superhydrophobicity can be changed by simply changing the surface morphology, which is possible by changing the electrospinning conditions.…
Hydrodynamic cavitation results in flow restriction in a flow system causing rapid pressure fluctuations and significant fluid forces. These can be harnessed to mediate microbial cell damage. Hydrodynamic cavitation was studied for the partial disruption of E. coli and selective release of specific proteins relative t…
Nanograined materials have some unusual properties. To maintain the small size of the grains, grain growth should be avoided. But recently grain growth has been observed under an indenter at liquid-nitrogen temperatures. Such grain growth has never been reported before. How can this happen and how can it be prevented?…
We describe herein a new facile approach to control the size and morphology of polypyrrole (PPy) nanotubular/wire structures in the presence of a cationic surfactant. The fibrillar complex of FeCl 3 and methyl orange (MO), acting as a reactive self-degraded template for the formation of polypyrrole nanotubules, was mo…
Clock-rolled, high-purity, textured polycrystalline zirconium exhibits significant plastic anisotropy for compression along the through-thickness and in-plane directions and strong temperature dependence of flow stress for both orientations. Orientation imaging microscopy in a scanning electron microscope and defect a…
The adaptive resolution scheme (AdResS) for efficient hybrid particle-based atomistic/mesoscale molecular dynamics (MD) simulations recently introduced by us, [J. Chem. Phys. 123, 224106 (2005)] is extended to high density molecular liquids with spherical boundaries between the atomistic and mesoscale regions. The key…
In polymers, it is possible to obtain single chain forming single crystals. It is feasible to melt these crystals by simple consecutive detachment of chain segments from the crystalline substrate and its diffusion into the melt. However, complication in the melting process occurs when the chain in the process of detac…
A novel strategy for the fabrication of multiwall carbon nanotube-nanocrystal heterostructures is shown. Different quantum dots (QDs) with narrow size distributions were covalently coupled to carbon nanotubes (CNTs) and silica-coated CNTs in a simple, uniform, and controllable manner. The structural and optical proper…
Layered composites of Cu/Nb achieve very high strength levels when the individual layer thicknesses are 1–10 nm, attributable to the interfaces acting as barriers to slip. Atomistic models of Cu/Nb bilayers were used to explore the origins of this resistance. The models clearly show that dislocations placed near an in…
We study the effects of magneto-elastic coupling on the degenerate ground state of the antiferromagnetic Heisenberg model on regular triangle and tetrahedron clusters of spin-1/2. Both give very similar results. Static distortion lifts the degeneracy of the ground state through the distance dependence of the exchange…
The mechanism of spin-phonon coupling in high-T$_C$ copper oxides is explored from band calculations on La$_{(2-x)}$Sr$_x$CuO$_4$ and HgBa$_2$CuO$_4$ systems. The LMTO band calculations, based on the local density approximation, are made for cells containing frozen phonon displacements and/or spin waves within the CuO…