Materials Literature
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Thin films of amorphous Se 90- x Sb 10 In x and GeSe have been prepared by electron beam evaporation technique. The effect of irradiation of GeSe and Se 90- x Sb 10 In x ( x = 0, 5, 10, 15) thin films on the optical energy gap and dc activation energy has been investigated for different doses of 12 C 5+ and 107 Ag 14+…
The dramatic increases in ionic conductivity in ${\mathrm{Gd}}_{2}({\mathrm{Ti}}_{1\ensuremath{-}x}{\mathrm{Zr}}_{x}{)}_{2}{\mathrm{O}}_{7}$ solid solution are related to disordering on the cation and anion lattices. Disordering in ${\mathrm{Gd}}_{2}({\mathrm{Ti}}_{1\ensuremath{-}x}{\mathrm{Zr}}_{x}{)}_{2}{\mathrm{O}}…
Our objective was to strengthen and stabilize collagen films without the introduction of cytotoxic chemical crosslinkers. We hypothesized that collagen could be rapidly crosslinked with glucose with ultraviolet (UV) irradiation as a catalyst. In theory, UV-generated free radicals can expedite collagen crosslinking wit…
TiO 2 thin films were grown on several kinds of SAMs (self-assembled monolayers) using TC (titanium tetrachloride), TDD (titanium dichloride diethoxide), or TE (titanium tetraethoxide) as a starting material. We discussed the thin film formation mechanism and improvement of feature edge acuity through controlling the…
The synthesis, structure, and photochemical behavior of the trans isomers of 4-(N-phenylamino)stilbene (1c), 4-(N-methyl-N-phenylamino)stilbene (1d), 4-(N,N-diphenylamino)stilbene (1e), and 4-(N-(2,6-dimethylphenyl)amino)stilbene (1f) are reported and compared to that of 4-aminostilbene (1a) and 4-N,N-dimethylaminosti…
Spray pyrolysis was used to prepare polycrystalline thin films of undoped Ga 2 O 3 , as well as those doped separately with Eu 3+ , Tb 3+ and Tm 3+ . The energy gap values of the as-grown films and those annealed at 600\r{}C and 900\r{}C were found to be 4.75, 4.48 and 4.44 eV, respectively. Films containing Eu 3+ and…
The structural stability and electronic structure of face-centered-cubic Ti, Zr, and Hf were studied by means of first-principles full-potential calculations. The total-energy calculations demonstrate that Ti, Zr, and Hf have a locally stable fcc structure, i.e., the elastic stability criteria for a cubic crystal are…
We consider the question of whether a two-dimensional hard-disc fluid has a first-order transition from the liquid state to the solid state as in the three-dimensional melting-crystallization transition or whether one has two subsequent continuous transitions, from the liquid to the hexatic phase and then to the solid…
Thick (~50 nm) films of Hf were evaporated onto bare and oxidized Si(001) samples, and thin (~monolayer) films of Hf were evaporated onto clean Si(001)-(2x1) surfaces. Upon annealing to 1000$^/circ$C, films of HfSi2 were formed after reaction times that depended upon the surface condition of the substrate before depos…
Field emission (FE) electron spectroscopy from an individual multiwalled carbon nanotube (MWNT) is used to measure quantitatively stable temperatures at the apex, T(A), of up to 2000 K induced by FE currents approximately 1 microA. The high T(A) is due to Joule heating along the length of the MWNT. These measurements…
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Periodic density functional calculations on three sodalites [Cd 4 S(AlO 2 ) 6, Zn 4 O(BO 2 ) 6, and Zn 4 S(BO 2 ) 6 ] were performed. Lowest-energy allowed electronic transitions were always found to be localized on the M 4 X (M = Cd, Zn; X = O, S) clusters encapsulated into lattice cages. Predicted excitation energie…
Laser action in a dye-doped ferroelectric liquid crystal (FLC)—at the edge of the photonic stop band—has been demonstrated for the first time. The FLC used is a multicomponent mixture with a well-controlled short pitch of its helical structure whose periodic is equivalent to visible optical wavelengths. The laser emis…
In this paper, we report on diamond microtubes that have been manufactured to work as flow controllers in choking conditions. Tungsten wires are used as moulds to make the diamond microtubes. A continuous diamond film has been deposited by chemical vapour deposition, and acid etching of the tungsten has been performed…
Pressure effects on the structural parameters are investigated in a half-doped manganites $({\mathrm{Nd}}_{0.125}{\mathrm{Sm}}_{0.875}{)}_{1/2}{\mathrm{Sr}}_{1/2}{\mathrm{MnO}}_{3},$ by means of the synchrotron-radiation x-ray powder diffraction measurement. The compound shows a pressure-induced metal-insulator transi…
The synthesis and structural characterization of a new precursor solid solution SrAl2 − xBxO4 (0 < x < 0.2), for phosphor materials is reported. The synthesis temperature of SrAl2O4 is considerably reduced by B substitution. The new solid solution keeps the tridymite-like structure (P21) characteristic of SrAl2O4. Mic…
The doorway window representation of sequential four wave mixing combined with the nonlinear exciton equations (NEE) is used to calculate femtosecond pump probe spectra of the dendrimeric nanostar. Direct signatures of exciton funneling and the two-exciton states are identified. The frequency-domain pump−probe signal…
We report the first computational study of the chromophores responsible for the chromogenic effects of aromatic neurotoxicants containing a 1,2-diacetyl moiety in their oxidation metabolites. A series of ab initio electronic structure calculations was performed on two representative aromatic compounds, 1,2-diacetylben…
An attempt to rationalize the behaviour of iron(II) spin-crossover compounds under hydrostatic pressure at room temperature from a comparative analysis of data is reported. The selected pressure-induced spin transitions are those previously described for Fe(phen)2(NCS)2 [polymorphs I (a) and II (b)], Fe(py)2bpym(NCS)2…
Thin-film semiconducting devices containing inorganic as well as organic layers have been fabricated via solution processing (see Figure). Using high work function transition metal dichalcogenides (TMDCs) it is possible to reduce the barrier to hole injection into the polymer. A blocking barrier layer can be introduce…