Materials Literature
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We propose a physical concept of non-reciprocal transformation optics, by which a one-way invisible cloak is designed. The one-way invisible cloak is made of a coordinate-transformed nonreciprocal photonic crystal, showing a perfect cloaking for wave incident from one direction but acting as a perfect reflector for wa…
Selective reduction of 2-nitro-3-methoxybenzaldehyde provides 2-amino-3-methoxybenzaldehyde that undergoes the Friedländer condensation with a variety of acetyl-substituted derivatives of pyridine and 1,10-phenanthroline. After cleavage of the methyl ether, the resulting polydentate analogues of 8-hydroxyquinoline are…
TiO2/CdS core-shell nanowires were synthesized using a simple thermal oxidation treatment of a Ti film, followed by O2 plasma treatment and CdS coating via low-cost chemical bath deposition. The 5 and 20 nm thick CdS films were uniformly coated onto TiO2 nanowires using 200 and 40 ml aqueous solvent, respectively. Tim…
We experimentally and theoretically investigate the nonlinear electromagnetic properties of an on-chip metamaterial system comprised of two coupled ring resonators (CRRs) as meta-dimer and a varactor loaded in between them as nonlinear medium inclusion. The resonant frequency of the anti-symmetric coupling mode of CRR…
Abstract Poly(3,4‐ethylenedioxythiophene) (PEDOT) doped with a series of anionic polysaccharides such as carboxymethyl cellulose, sodium hyaluronate, xanthan gum, pectin, gellan gum were prepared by electropolymerization in aqueous solutions. Some other dopants of potassium nitrate, potassium sulfate, sodium poly(styr…
1, 3, and 5 wt.% silver-doped ZnO (SZO) nanowires (NWs) are grown by hot-walled pulsed laser deposition. After silver-doping process, SZO NWs show some change behaviors, including structural, electrical, and optical properties. In case of structural property, the primary growth plane of SZO NWs is switched from (002)…
Polyvinyl alcohol polymer films doped with Sm,Tb(Sal) 3 Phen complexes have been synthesized using solution casting technique. An enhancement in absorption intensity is observed revealing the encapsulation of rare earth ions by salicylic acid (Sal)/1,10 phenanthroline (Phen) complex. Photoluminescence spectra of the c…
Single crystal synchrotron X-ray diffraction measurements have been carried out on [Nd(DMF)(4)(H(2)O)(3)(μ-CN)Fe(CN)(5)]·H(2)O (DMF = dimethyl-formamide), 1; [Y(DMF)(4)(H(2)O)(3)(μ-CN)Fe(CN)(5)]·H(2)O, 2; [Ce(DMF)(4)(H(2)O)(3)(μ-CN)Fe(CN)(5)]·H(2)O, 3; [Sm(DMF)(4)(H(2)O)(3)(μ-CN)Fe(CN)(5)]·H(2)O, 4; [Tb(DMF)(4)(H(2)O)…
We have observed a persistent x-ray induced insulator-metal transition at low temperature for an epitaxial film of electron-doped VO${}_{2}$, a material as characterized by strong electron-electron and electron-lattice interactions. The volume fraction of the photo-generated metallic patches, ranging from 0 to 100% of…
The dynamics of a single tripeptide Arg-Gly-Asp (RGD) adsorbing onto negatively charged hydroxylated rutile (110) surface in aqueous solution was studied using molecular dynamics (MD) simulations. The results indicate that the adsorbed Na + ions play an important role in determining the binding geometry of RGD. With a…
We investigate the spin dynamics of a nitrogen-vacancy (NV) center contained in an individual diamond nanocrystal in the presence of continuous microwave excitation. Upon periodic reversal of the microwave phase, we observe a train of ``Solomon echoes'' that effectively extends the system coherence lifetime to reach s…
We demonstrate that homogeneous single-layer graphene can be grown by simply annealing crystalline Cu(111)/c-plane sapphire (α-Al2O3) at 900 and 1000 °C without additional carbon supply. The resulting graphene film shows a high carrier mobility of 1210 cm2 V−1 s−1. However, the annealing at a lower temperature of 800…
By means of a model Hamiltonian approach we study the role of volume expansion, Hund's coupling, and electron correlation in the standard hybridization mechanism for ferroelectricity in cubic CaMnO${}_{3}$, a prototypical non-${d}^{0}$ perovskite. Our results establish that the ferroelectric instability arises from a…
We review recent experimental work to utilize the size dependence of the luminescence quenching of colloidal semiconductor quantum dots induced by functionalized porphyrin molecules attached to the surface to describe a photoluminescence (PL) quenching process which is different from usual models of charge transfer (C…
The localized surface plasmon (LSP) enhancement in a gold nanoparticle is demonstrated in this paper. The enhancement of LSP is influenced by both size and the dielectric gain medium surrounding the nanoparticles. The nanoparticle is found to induce plasmonic enhancement of varying degrees depending on its size, and i…
Introduction to Polymer Blends History of Polymer Blends Flory-Huggin's Solution Theory-and Beyond Miscible Polymer Blends Partially Miscible Polymer Blends Natural Polymers Polymer Alloy Equation of State Theories for Polymers Small Molecules and Large Molecules PVT Relations for Polymeric Liquids Tait Equation Flory…
Due to the injection of primary electrons and the emission of secondary electrons in the surface layer of insulating materials, the target surface will be negatively or positively charged. A method by injecting a single pulse beam and using a small current detector for the total electron emission yield measurement of…
Titanium-doped sodium alanate has been shown to have potentially useful properties for storing hydrogen in fuel cell vehicles. To quantitatively explain the kinetic rates and activation energies for hydrogen release and absorption, it is necessary to calculate the rate of metal diffusion that is required for forming t…
The CeAl 4 -doped NaAlH 4 has been synthesized by mechanical milling NaH/Al mixture with 4 mol % CeAl 4 as catalyst under hydrogen pressure of 3 MPa. The hydrogen desorption thermodynamics and kinetics of as-synthesized NaAlH 4 were systematically investigated. The enthalpies for the first and second dehydrogenation s…
We present a detailed experimental and theoretical study on how structural properties of carbon nanotubes can be derived from ${}^{13}$C NMR investigations. Magic angle spinning solid state NMR experiments have been performed on single- and multiwalled carbon nanotubes with diameters in the range from 0.7 to 100 nm an…