Materials Literature
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Abstract The relationship between the contact angles, surface tension, and surface roughness is reviewed. Numerical formulas related to the superhydrophobic rough surfaces of polymers are predicted with two approaches, the Wenzel and Cassie–Baxter models. With these models as a guide, an artificial superhydrophobic su…
The first artificial double helix composed of achiral synthetic polymers have been constructed by twisting of a supramolecular ladders from poly(trimethylene imine) salts and porphyrin-bridged BisPYBOXs through hydrogen bonds between the PYBOX groups and secondary ammonium cations in the polymer.
The 1H and 2H NMR spectra of porphycene (1), 2,3,6,7,12,13,16,17-octaethylporphycene (2), 2,7,12,17-tetra-n-propylporphycene (3), and 2,7,12,17-tetra-(tert-butyl)-3,6-13,16-dibenzo[cde;mno]porphycene (4) partially deuterated in the mobile proton sites are reported. These compounds exhibit two intramolecular NHN hydrog…
Abstract In this paper we investigate cobalt doped ZnO thin films prepared via different sol–gel methods. XRD shows only the diffraction peaks from wurtzite ZnO without secondary phase, as widely reported in literature, for the Co contents of our samples of 3 to 12%. Raman spectroscopy reveals the existence of antifer…
Composites based on ferrite powders Ni0.95-xZnxCo0.05Fe1.90Mn0.02O4with x=0-0.25, with a volume concentration of 50%, were fabricated and characterized. Dielectric and magnetic properties of the composites were measured over 0.01-16.5 GHz. The permeability of the composites at low frequency increases from ~4.18 to ~7.…
In this work, it has been shown that, through a highly controlled process, the chemical etching of the anodic aluminum oxide membrane barrier layer can be performed in such a way as to achieve nanometer-scale control of the pore opening. As the barrier layer is etched away, subtle differences revealed through AFM phas…
Accurate structure factors of silicon and diamond have been experimentally determined from powder diffraction data measured at the third-generation synchrotron-radiation source SPring-8, BL02B2. The accuracy of the obtained structure factors has been evaluated by comparing with structure factors in the literature meas…
${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}$ thin films having different thicknesses were grown by pulsed laser deposition with in situ reflection high energy electron diffraction diagnostics on $\mathrm{La}\mathrm{Al}{\mathrm{O}}_{3}$ substrates. The mismatch between film and substrate gives ri…
Abstract This research paper presented a novel approach of developing excellent protection from ultraviolet (UV) radiation of cotton fabrics by means of water vapor permeable (WVP) coatings containing multiwall carbon nanotube (MWNT), a stable and strongly UV absorbing species. The WVP of MWNT containing UV protective…
FUNDAMENTALS OF LUMINESCENCE Absorption and Emission of Light, E. Nakazawa Electronic States and Optical Transitions of Solids Crystals, S. Nara, and S. Ibuki Luminescence of a Localized Center, H. Yamamoto Impurities and Luminescence in Semiconductors, S. Ibuki Luminescence of Organic Compounds, T. Tsutsui and C. Ada…
Hierarchical tree-shaped nanostructures, nanobelts, and nanowires of Zn3P2 were synthesized in a thermal assisted laser ablation process. All nanostructures are tetragonal phased Zn3P2 with excellent crystallinity and are free from an oxidization layer according to electron microscopy and X-ray diffraction analyses. O…
Abstract A facile strategy for finely controlling the wettability transition temperature of colloidal‐crystal films from superhydrophilic (water contact angle, CA, 0°) to superhydrophobic (water CA, 150.5°) is demonstrated. The colloidal‐crystal films are assembled from poly(styrene‐ n ‐butyl acrylate–acrylic acid) am…
We investigate the current-driven magnetization dynamics in narrow Permalloy wires by means of Lorentz microscopy and electron holography. Current pulses are found to transform the magnetic structure in the uniformly magnetized state below the Curie temperature. A variety of magnetic states including reversed magnetic…
Abstract Germanium‐based compounds have recently attracted considerable attention in Semiconductor Spintronics. The Mn 5 Ge 3 compound have been grown on Ge(111) substrate so that epitaxial “spin valves” can be fabricated. Recent experiments suggest a spin structure that is likely non‐collinear. In order to gain deep…
Cross-linked polyelectrolyte multilayer films (CL PEM) have an increased rigidity and are mechanically more resistant than native (e.g., uncrosslinked) films. However, they are still biodegradable, which make them interesting candidates for biomedical applications. In this study, CL PEM films have been explored for th…
Chirality plays a key role for exhibiting specific physical properties in functional materials. Molecule-based magnets can strategically introduce the chirality in their frameworks as a molecular property of co-ligand, and magnetic frameworks providing local magnetic anisotropy and noncentrosymmetric structure are exp…
We study magnetism in magnetically doped quantum dots as a function of confining potential, particle numbers, temperature, and strength of Coulomb interactions. We explore possibility of tailoring magnetism by controlling the electron-electron Coulomb interaction, without changing the number of particles. The interpla…
Characteristic temperatures in ferromagnetic - antiferromagnetic exchange biased systems are analyzed. In addition to usual blocking temperature of exchange bias $T_{B}$, and the Néel temperature of an antiferromagnet $T_{N}$, the inducing temperature $T_{ind}$, i.e., the temperature, at which the direction of exchang…
We present results of electronic structure calculations for well-relaxed Au/benzene-1,4-dithiol/Au molecular contacts, based on density functional theory and the generalized gradient approximation. Electronic states in the vicinity of the Fermi energy are mainly of Au 5d and S 3p symmetry, whereas contributions of C 2…
Injecting spins into a semiconductor channel and transforming the spin information into a significant electrical output signal is a long standing problem in spintronics. Actually, this is the prerequisite of several concepts of spin transistor. In this tutorial article, we discuss the general problem of spin transport…