Materials Literature
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In order to engineer a band gap into graphene, covalent bond-forming reactions can be used to change the hybridization of the graphitic atoms from sp(2) to sp(3), thereby modifying the conjugation length of the delocalized carbon lattice; similar side-wall chemistry has been shown to introduce a band gap into metallic…
1. General Introduction (G. Schmid).2. Quantum Dots (W. Parak, et al.).Introduction and Outline.Nanoscale Materials and Quantum Mechanics.From Atoms to Molecules and Quantum Dots.Shrinking Bulk Materials to a Quantum Dot.Energy Levels of a (Semiconductor) Quantum Dot.Varieties of Quantum Dots.Optical Properties of Qua…
Abstract A facile and economic approach has been developed for the synthesis of coaxial nanocables with AuNi alloy nanowires as inner solid cores and NiO as outer shells by infiltrating a gold‐coated anodic aluminum oxide (AAO) template, with ring‐shaped Al foil on its outer edge, with a mixed aqueous solution of NiCl…
Phenol formaldehyde composites are modified with glycerol—tannin mixes with varying percentages by weight of phenolic resin to glycerol—tannin. The glycerol-to-tannin ratio is also varied. In this study also, different percentages by weight of SLG (a commercial ceramic microsphere) are added to the composites. The eff…
Abstract In this article, a soluble poly[2‐methoxy‐5‐(3′‐methyl)butoxy]‐ p ‐phenylene vinylene (MMB‐PPV) was synthesized by dehydrochlorination reaction and the MMB‐PPV film was implanted by nitrogen ions (N + ) with the ion dose and energy in the range of 3.8 × 10 15 to 9.6 × 10 16 ions/cm 2 and 15–35 keV, respective…
Single crystals of the title compound, strontium tetra-praseo-dymium tris-(silicate) oxide, SrPr(4)(SiO(4))(3)O, have been grown by the self-flux method using SrCl(2). The structure is isotypic with the apatite supergroup family having the generic formula (IX)M1(2) (VII)M2(3)((IV)TO(4))(3)X, where M = alkaline earth a…
The synthesis of two new derivatives of Rhodamine B functionalized by phenols is reported. For one rhodamine derivative, the equilibrium between the open form and the ring-closed (spirolactam) form is completely shifted toward the latter, whereas the constitution of the other rhodamine derivative precludes ring closur…
A continuing challenge in materials design is the achievement of greater operational efficiency through improvements in performance criterion, particularly, high strength and service lifetime characteristics. In this study, we report on the effect of heat treatment (annealing) on the stress corrosion cracking (SCC) be…
Poly(3-docosoxy-4-methylthiophene) (PDMT) was synthesized and investigated. PDMT can form a mesophase by rapid quenching from the isotropic melt. Variable- temperature reflection and fluorescence spectroscopy of thin films and differential scanning calorimetry were used to study the thermal behavior of PDMT. PDMT show…
Abstract Room‐temperature (RT) ferromagnetism (FM) has been observed in Fe‐doped ZnO bulk samples fabricated by a coprecipitation method, and the effect of additional Cu doping on magnetic properties of the samples has been investigated. The results of XRD show that all doping samples are single‐phase with a wurtzite…
Abstract The synthesis of a water‐soluble copolymer containing quinoline groups, P(DMAM‐ co ‐SDPQ), through free radical copolymerization of N,N ‐dimethylacrylamide, DMAM, with 2,4‐diphenyl‐6‐(4‐vinylphenyl)quinoline, SDPQ, is presented and the optical properties of the final product are investigated in aqueous soluti…
Abstract We have applied a special variant of optical DLTS to deep levels found in ZnO thin films. The optical emission rates of charge carriers from deep levels into a band have been measured over a range of photon energies from 0.7 to 3.0 eV and photoionization cross‐section spectra calculated from this data. Two of…
The nature of the magnetic ground state of the spin-frustrated molecular magnet {Mo 72 Fe 30 } is studied using polarized neutron scattering and specific heat methods. The magnetic scattering cross section up to 2.30 Å −1 has been determined by means of diffuse neutron scattering with xyz polarization analysis at temp…
In a study of type-I ${\text{Ba}}_{8}{\text{Al}}_{x}{\text{Ge}}_{46\ensuremath{-}x}$ clathrates for $4\ensuremath{\le}x\ensuremath{\le}16$, several samples with different stoichiometric compositions were prepared and measured. Here we report wavelength dispersion spectroscopy, powder x-ray diffraction and resistivity…
Highly chemselective and low costly rare earth phenolate catalysts for direct synthesis of thiol-functionalized poly(ε-caprolactone) (PCLSH) has been developed. Well-defined PCLSH polymers are obtained without tedious protecting/deprotecting steps via this convenient synthetic approach.
Abstract The synthesis and characterization of series of segmented poly(propylene glycol) (PPG)‐based ammonium ionenes is described. Bromine end‐capped oligomers were successfully synthesized using the reaction of 6‐bromohexanoyl chloride with 1000, 2000, and 4000 g/mol PPGs. 1 H NMR spectroscopy, titration studies, a…
Gold nanoparticles stabilized with different capping agents were synthesized in a two-phase liquid-liquid system and found to self-assemble into various patterns at the air/water interface. The shapes of the patterns are closely related to the molecule structures of the capping agents. Systems with mixed capping agent…
Highly conducting carbon nanotube has been widely studied as electrode in double-layer-effect supercapacitors. In this paper, we introduce a hybrid-electrode design to further improve the specific capacitance by incorporating TiO2nanotubes with carbon nanotubes. Vertically oriented TiO2nanotube arrays are fabricated b…
We have investigated the anisotropic dynamic dielectric response of aligned and well-isolated single-walled carbon nanotubes using optical-pump terahertz (THz)-probe techniques. The polarization anisotropy measurements demonstrate that the THz radiation interacts only with radiation polarized parallel to the nanotubes…
Abstract We clarified the birefringence properties of poly(methyl methacrylate), poly(ethyl methacrylate), poly(isobutyl methacrylate), poly(cyclohexyl methacrylate), poly(isopropyl methacrylate), and poly( tert ‐butyl methacrylate). We demonstrated that the conformational change in polymer molecules that causes orien…