Materials Literature
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Crystalline ceramic powders of Er3Al5O12 were obtained by low temperature direct combustion synthesis. Irradiating the sample with a low-power continuous-wave infrared (1.48μm) diode laser led to ultraviolet, violet, blue, green, and red (380, 410, 456, 495, 525, 550, and 660nm) emissions. The strong upconversion lumi…
Both transient and persistent photoconductivities (abbreviated to TPC and PPC, respectively) are observed in oxygen-deficient La2∕3Sr1∕3MnO3−δ thin films at low temperatures. The magnitudes of TPC and PPC are 7.6% and 6.08%, respectively, with light density of 4.35mW∕cm2 at 50K. Moreover, a small magnetic field can er…
The refractive index and absorption index of nanocrystalline diamond (NCD) films were investigated using spectroscopic ellipsometry between 30 and 500°C. Due to their high transparency the experimental spectra could be well fitted in the subgap region using a single-oscillator model with a four-phase layered structure…
Considering almost all the effective processes of physics and chemical reaction in our numerical computation model, we investigate the mechanism of single bubble sonoluminescence (SBSL). For those sonoluminescing single bubbles in water at its flashing phase, the numerical simulation reveals that if the temperature in…
The triphenylene core provides a versatile platform from which discotic liquid crystals can be constructed. Synthetic advances permit the effect that substantial or subtle variation on structure has on mesophase formation. Through comparison of many derivatives, from our studies and others, it appears that the discoti…
Zn 1 − x Mg x O (x=0.3) thin films have been fabricated on Pt∕TiO2∕SiO2∕Si substrates using multimagnetron sputtering technique. The films with wurtzite structure showed a (002) preferred orientation. Ferroelectricity in Zn1−xMgxO films was established from the temperature dependent dielectric constant and the polariz…
With the help of the "neutral inclusion" concept, the conditions of electromagnetic wave transparency for multilayered spheres, coated spheroids, and general particulate composites are analytically derived in the quasistatic case. The basic idea is to make the effective material property of a composite region equal to…
The neutral oxygen vacancy (OV) energy formation for bulk, subsurface sites at different depths from the surface and various surface sites has been estimated for single crystals, unsupported ultrathin films of MgO, CaO, and BaO, and MgO ultrathin films supported on Ag(001). From the calculated energy barriers for diff…
The electronic structure of an $f$-electron charge-density-wave (CDW) system, $\mathrm{Ce}{\mathrm{Te}}_{2}$, has been investigated using high-resolution angle-resolved photoemission spectroscopy (ARPES). Two gaps of $\ensuremath{\sim}100$ and $\ensuremath{\sim}500\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$ have been obs…
Alles wird Gel: Amphiphile Donor-Acceptor-substituierte Butadiene bilden durch konzentrationsabhängige Selbstorganisation stark fluoreszierende Vesikel und Gele. Die selbstständige Reparatur dieser Vesikel und Gele nach lichtinduzierter Zerstörung beruht auf der Photochromie des Butadien-Chromophors.
The influence of spherical nanoindentation on the band edge and deep level emission of single crystal c-axis ZnO has been studied by cathodoluminescence (CL) spectroscopy and monochromatic imaging. Excitonic emission is quenched at the indent site and defect emission in the range of 450–720nm is enhanced. Analysis of…
c -axis-oriented epitaxial SrBi4Ti4O15 and CaBi4Ti4O15 films having natural superlattice structure were grown on (001)cSrRuO3‖(001)SrTiO3 substrates by metal organic chemical vapor deposition. SrBi4Ti4O15 films suffer no degradation with a dielectric constant of 200 down to a film thickness of 15nm, which corresponds…
Electron paramagnetic resonance measurements were presented to investigate paramagnetic oxygen vacancies (F+ centers) in Co-doped TiO2 nanocrystals. Surface and interior F+ centers were manipulated by washing or/and annealing. Anisotropic surface F+ centers are so instable as to be destroyed at high temperature, while…
A new electrically addressed and thermally erased cholesteric cell has been investigated. The helical pitch of the cholesteric mixture becomes longer with increasing temperature. After an electric field is applied to the mixture, a focal conic texture is formed. When being heated, the cholesteric phase has a tendency…
Using transmission and reflection measurements in a five layer micrometer-scale split-ring resonator (SRR) system, fabricated by a photolithography procedure, the authors demonstrate the occurrence of a negative magnetic permeability regime in that system at ∼6THz. The transmission and reflection were measured using o…
Abstract Poly(ethylene oxide) nanocomposites filled with functionalized multi‐walled carbon nanotubes are prepared and characterized using rheological and morphological measurements. This study investigates how the surface treatment of carbon nanotubes (CNTs) affects the CNT dispersion state. It is found that the nano…
Carbon nanotubes have been deposited and aligned onto the pre-structured metal contacts of a silicon chip. Crucial for the deposition and alignment process are micro-fluidic flow fields combined with electric dipole fields generated by surface acoustic waves within a gap filled with an aqueous carbon nanotube suspensi…
The ultimate degradation (i.e. complete mineralization) of biodegradable polymers proceeds through hydrolysis to the production of degradation intermediates (primary degradation) that are then taken into the microbial cell and further degraded to CO2 and water. We first isolated thermophilic actinomycete (Streptomyces…
The unusual exhibition of a biaxial nematic phase in nonlinear thermotropic mesogens derived from the 2,5-oxadiazole biphenol (ODBP) core is placed in a general context; the uniaxial nematic phase of the prototypical rod-like mesogen para-quinquephenyl does not follow the classical mean-field behaviour of nematics, th…
Abstract A series of biodegradable, thermoplastic polyurethane elastomers poly(ϵ‐caprolactone‐co‐lactide(polyurethane [PCLA–PU] were synthesized from a random copolymer of L ‐lactide (LA) and ϵ‐caprolactone (CL), hexamethylene diisocyanate, and 1,4‐butanediol. The effects of the LA/CL monomer ratio and hard‐segment co…