Materials Literature
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Mesoporous silica was synthesized in the presence of metal (Au, Pt, and Ag) nanoparticles in the 2−20 nm range. Sample characterization was performed by X-ray diffraction and electron microscopy. The metal nanoparticles in the 2−10 nm range were successfully incorporated into the ordered mesoporous SBA-15 structures;…
A detailed theoretical study is presented for the influence of linearly polarised intense terahertz (THz) laser radiation on energy states of hydrogen-like impurities in semiconductors. The dependence of the binding energy for 1s and 2p states on intensity and frequency of the THz radiation has been examined.
Elementary electronic excitation is studied theoretically for a 2DEG in the presence of spin orbit (SO) interaction induced by Rashba effect. In such a system, coupled plasmon-phonon excitation can be achieved via intra- and inter-SO electronic transitions. As a result, six branches of the coupled plasmon-phonon oscil…
The local structure of Ba6Ge25 has been studied by x-ray diffraction and the atomic pair distribution function technique at 40 K and room temperature. Unambiguous evidence has been found that two out of three types of Ba atoms in Ba6Ge25 move off their positions and become locked in split sites at low temperatures.
We model the influence of scattering along the channel and extension regions of dual gate nanotransistor. It is found that the reduction in drain current due to scattering in the right half of the channel is comparable to the reduction in drain current due to scattering in the left half of the channel, when the channe…
A novel class of surface-active copolymers is described, designed to protect surfaces from nonspecific protein adsorption while still inducing specific cell attachment and spreading. A graft copolymer was synthesized, containing poly-(L-lysine) (PLL) as the backbone and substrate binding and poly(ethylene glycol) (PEG…
Electrochemically prepared poly(3,4-ethylenedioxythiophene) (PEDT) poly(styrenesulfonate) (PSS), produced from acidic (PSSH) and basic (PSSNa) PSS, was characterized by cyclic voltammetry CV, UV−vis spectroscopy, in situ conductivity, and XPS spectroscopy and was compared with electrochemically prepared PEDT/tosylate…
Fully (99+ %) hydrolyzed poly(vinyl alcohol) (PVA) was electrospun from water using Triton X-100 surfactant to lower the surface tension. The diameter of the electrospun PVA fibers ranged from 100 to 700 nm. Treatment of the PVA fiber mats with methanol for 8 h stabilized the fibers against disintegration in contact w…
Abstract Interpenetrating networks of organic and inorganic semiconductors are attractive for photovoltaic cells because electron transfer between the two semiconductors splits excitons. In this paper we show that films of titania with a uniform distribution of pore sizes can be made using a block copolymer as a struc…
A major target in diamond deposition is the growth of heteroepitaxial diamond films that are free from impurities, grain boundaries and defects for use in electronic applications. Nickel has been identified as a material with a close lattice match to diamond that minimises defect formation in diamond films but as a su…
An account is given of the preliminary steps that led to a parametrization of the absorption bands of rare-earth ions in aqueous solution.
The thermoelectric generation is the direct energy conversion method from heat to electric power. The conversion method is a very useful utilization of waste energy because of its possibility using a thermal energy below 423K. This research objective is to establish the thermoelectric technology on an optimum system d…
The nanomechanical properties of radio-frequency sputtered ultrathin carbon films measured by surface force microscopy were correlated to the carbon bonding structures analyzed by x-ray photoelectron and Auger electron spectroscopy. The films consisted of amorphous carbon (a-C) comprising both trigonal (sp2) and tetra…
BaTiO3 thin films have been grown directly on Pt (111)/Ti/SiO2/Si (100) substrates by a modified sol-gel method. X-ray diffraction analysis shows that the BaTiO3 thin films are polycrystalline. The infrared optical properties of the thin films are investigated using the infrared spectroscopic ellipsometry (IRSE) in th…
The structure−dynamics relationships in random copolymers of poly(butylene adipate) and poly(butylene isophthalate) (PBIPBA) have been investigated by means of X-ray scattering and dielectric loss spectroscopy experiments. The results show that the incorporation of flexible butylene adipate units into the more rigid P…
Abstract Selected on the basis of computational studies and synthetic feasibility, the title compound 9c has been obtained by cross‐coupling of 4,4′‐bis( p ‐butylphenyl)‐2,2′‐biimidazole‐5,5′‐dicarbaldehyde ( 28c ) followed by oxidative aromatization. The introduction of a Suzuki coupling protocol opens the way to 2,7…
Luminescence properties of lanthanide(III) ions (Ln = Nd, Sm, Eu, Gd, Tb, Dy and Tm) were investigated by measuring the excitation and emission spectra, and emission lifetimes in H2O and D2O solutions of 3 moll−1 K2CO3, where anionic tetra-carbonate complexes, [Ln(CO3)4]5- were the predominant species. Electronic tran…
Dilute fixed fiber beds provide a model system for studying drop dynamics in disordered flows. Fluctuations about the mean uniform velocity are generated by fiber elements within the media, and the disturbance velocities far from any single fiber (at distances on the order of the pore size) have been predicted to be s…
The 4f11 energy levels of Er3+ in LiYF4 in the spectral region 39000–65000 cm−1 have been studied. The agreement between experimental energy levels, obtained from luminescence excitation spectra, and calculated energy levels is good. Luminescence originating from high-lying energy levels has been investigated. Emissio…
Room temperature optical absorption measurements of Nd3+ in NaBi(WO4)2 single crystals grown by the Czochralski method have been used to calculate the following Judd-Ofelt intensity parameters Ω2 = 30.9 × 10−20, cm2, Ω4 = 12.0 × 10-20 cm2 and Ω6 = 9.3 × 10−20 cm2. Using these parameters the emission properties of Nd3+…