Materials Literature
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Carbon nanotube thin films have been successfully fabricated by the electrophoretic deposition technique. The supercapacitors built from such thin film electrodes have a very small equivalent series resistance, and a high specific power density over 20 kW kg −1 was thus obtained. More importantly, the supercapacitors…
We report experimental results on amorphization and crystallization dynamics of reversible phase-change (PC) thin-film samples, GeSbTe and GeBiTe, for optical disk data storage. The investigation was conducted with subnanosecond laser pulses using a pump-and-probe configuration. Amorphization of the crystalline films…
A series of new lithium aluminum silicate (LAS) glass systems doped with chromium ion is prepared. The reflectance and transmittance of the glass slabs are recorded. By means of an iteration procedure, the glass refractive index n and the extinction coefficient k and their dispersions are obtained. Across a wide spect…
A method of creating rugate interference filters that have flat-topped reflectance across an extended spectral region is presented. The method applies known relations from the classical coupled wave theory to develop a set of equations that gives the spatial frequency distribution of rugate cycles to achieve constant…
Abstract We report photoluminescence (PL) and PL‐excitation spectroscopy of BN nanotubes (nt‐BN) mixed with some residual hexagonal crystalline (h‐BN) starting material, and of pure h‐BN microcrystalline powder. The nanotube phase exhibits a broad‐band PL near 380 nm, in agreement with a published report of cathodolum…
The sequence of previously found phase transitions in CsHSO 4 at around 60, 122, and 141 °C was carefully examined by using thermo-gravimetric analysis (TGA), mass spectroscopy (MS), differential thermal analysis, ac calorimetry, impedance spectroscopy, and x-ray diffraction (XRD). Our results show evidence that at al…
We have investigated the dielectric response in the terahertz (THz) spectral range of a series of Bi-layered ferroelectrics with Aurivillius structure involving ferroelectric compounds $({\mathrm{Bi}}_{4}{\mathrm{Ti}}_{3}{\mathrm{O}}_{12},\mathrm{Sr}{\mathrm{Bi}}_{2}{\mathrm{Ta}}_{2}{\mathrm{O}}_{9},\mathrm{Sr}{\mathr…
We presents what we believe to be a new approach to choosing a sequence of monitoring wavelengths for monochromatic monitoring of optical coating production. The new approach is based on a preproduction estimation of expected levels of errors in thickness of layers of a deposited coating. It is demonstrated that the p…
We review new strategies for the development of Gd3+-based T1-relaxation agents and paramagnetic chemical exchange saturation transfer (PARACEST) "sensing" contrast agents (SCAs) designed specifically to detect small molecules or enzymatic activity in living systems. The first class of agents exhibits molecular "sensi…
Abstract An efficient and simple wet chemistry methodology to synthesize iron filled singlewalled carbon nanotubes (Fe‐SWCNT) is presented. The route leads to the formation of long continuous iron cables within the tubes. Partial filling is also observed. The morphology, high filling aspect and the chemical profile of…
5-Nor-Me was prepared by a two-step synthesis. A disappearing polymorph, the yellow form (Y), was observed during synthesis, but pure Y could not be obtained with further purification by crystallization. The other two forms, red (R) and orange (O), were prepared by crystallization from tetrohydrofuran (THF) and absolu…
PEG was grafted onto chitosan regioselectively at the hydroxyl groups with phthaloylchitosan as an intermediate. After the graft reaction, the phthaloyl groups were deprotected to give chitosan-g-PEG copolymers with free amino groups. The chemical structure of the graft copolymers was confirmed by FT-IR, (1)H and (13)…
The magnetic phases of hexagonal perovskites RMnO 3 (R = Ho, Er, Tm, Yb, Sc, Y) are analysed using group theory and the Landau theory of phase transitions. The competition between various magnetic order parameters is discussed in the context of antiferromagnetic interactions. A phenomenological model based on four one…
We report ab initio calculations of the highly nonideal pyrope $({\mathrm{Mg}}_{3}{\mathrm{Al}}_{2}{\mathrm{Si}}_{3}{\mathrm{O}}_{12})$--grossular $({\mathrm{Ca}}_{3}{\mathrm{Al}}_{2}{\mathrm{Si}}_{3}{\mathrm{O}}_{12})$ garnet solid solution. The results highlight the crucial influence of the local environment of indi…
Abstract Summary: Microcellular wood fibre reinforced polymer materials are significant because of their possibility to reduce the density of automotive components through microcellular structure, process and product part advantages, and as a new development with bio‐fibre strengthened plastics. Soft wood fibre reinfo…
Biologically active proteins are loaded into liposomes, which are then used as templates for the layer-by-layer deposition of polyelectrolytes. The multilayer polyelectrolyte layers are then crosslinked to form a robust protective barrier (see figure). Enzymes encapsulated within composite nanocapsules generated by th…
Two achiral porphyrin derivatives, 5,10,15,20-tetrakis(4-methoxyphenyl)-21H,23H-porphine (TPPOMe) and 5,10,15,20-tetrakis(4-hydroxyphenyl)-21H,23H-porphine (TPPOH), were spread onto an air/water interface. The spreading films were transferred onto solid substrates by the Langmuir-Schaefer (LS) method. Although both of…
Photoluminescence (PL) behavior of peapod-derived double-walled carbon nanotubes (DWNTs)---the simplest form among multiwalled carbon nanotubes---is investigated. Even though the optical absorption and the resonant Raman spectra show the characteristic features of DWNTs, the PL signals originated from DWNTs are severe…
Abstract Time‐dependent density functional theory (TD‐DFT) calculations were carried out in a comparative study of the electronic absorption spectra of lead(II) phthalocyaninate (PbPc), tin(II) phthalocyaninate (SnPc), tin(IV) dichlorophalocyaninate (PcSnCl 2 ), germanium(II) phthalocyaninate (GePc), and germanium (IV…
Investigation of the crystal structure, magnetic ordering and magnetic properties of the compound TbCo0.5Mn0.5O3.06 has been carried out by neutron powder diffraction and magnetization measurements. The Co and Mn ions are shown to have a partial NaCl-type crystallographic ordering in the B-sublattice of the ABO3 perov…