Materials Literature
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Tensile tests on free-standing, 200-nm-thick Al films were conducted between room temperature and 200 °C. Applied strain rates were in the range 1×10−8–2×10−6/s. At a temperature of 200 °C a saturation of the flow stress was observed. The strain required to achieve steady-state saturation is of the order of 2×10−3, wh…
The valence band dispersions for Bi2Se3 have been determined using angle resolved photoelectron spectroscopy. The experimentally determined band dispersions are compared with theoretical band structure calculations. In general, good agreement between experiment and theory was found. However, energy bands in the Γ-Z di…
This work examines the material characteristics and magnetic properties of hexagonal M-type barium ferrite (BaFe12O19) films deposited by pulsed laser ablation deposition onto (111) magnesium oxide substrates at different oxygen growth pressures. X-ray diffraction data showed the lattice constant of the film grown at…
Experimental results showing that the surface of ferromagnetic materials is spontaneously magnetized by tribological actions such as friction and wear in the absence of external magnetic fields are presented. The magnetization mechanism of the frictional surface and wear particles is discussed based on the results of…
A fast Q-tensor method, which can model the configuration of the liquid crystal director fields containing defects, is proposed. Conceptually based on the Oseen–Frank approach, we have added temperature energy density terms in addition to the strain energy term. We have also derived an improved normalization method fo…
Time-dependent density functional theory (TDDFT) calculations were performed on the excitation energies and oscillator strengths of fully π-conjugated zinc oligoporphyrins. The TDDFT calculated results for the Q bands of the triply meso-meso-, β-β-, and β-β-linked zinc oligoporphyrins can well reproduce the significan…
The distribution of mobile charge carriers in the space-charge regions at grain boundaries of ceramic materials was modeled. Delocalization effects are neglected, i.e., we consider ionic defects or polarons. The calculations were performed for cubic-shaped grains of equal size. When considering the size dependence, th…
The molecular structures of Zr[(mu-H)(3)BH](4) and U[(mu-H)(3)BH](4) have been investigated by density functional theory (DFT) calculations and gas electron diffraction (GED). The triply bridged bonding mode of the tetrahydroborate groups in the former is confirmed, but both DFT calculations and GED structure refineme…
Not double Dutch! The resolution of racemates with families of structurally related resolving agents (see examples depicted) is termed Dutch Resolution. Certain family members are regularly not incorporated; these turn out to be nucleation inhibitors. This leads to a simplified, two-component resolution procedure with…
The structure of the γ-, δ-, ε-, and ξ-isomers and the bonding in the α-, β-, γ-, δ-, ε-, and ξ-isomers of [Mo 8 O 26 ] 4- isopolyanions have been calculated using density functional theory. The optimized structures are in reasonably good agreement with those determined experimentally with the exception of the γ-form.…
Transmission electron microscopy was applied to study ZnO grown by metalorganic vapor phase epitaxy on Al2O3(0001) substrates. The defect structure of the material is dominated by an extraordinary high density of small stacking faults with extensions between 5 and 25 nm which induce a bright small-scale speckle contra…
A water and methanol mixture permits the transfer of the tin–chalcogen substructure of chalcogenostannate anions into the coordination sphere of transition-metal ions without decomposition. The reaction of K4[SnSe4] with [Co(en)3]Cl3 yields compound 1, which contains highly charged, purely inorganic ternary anions.
The desorption kinetics of a series of poly(ethylene glycol)-dimethyl ethers (PEG-DMEs, CH 3 (OCH 2 CH 2 ) n OCH 3, n = 1−22) adsorbed on graphite have been measured to study the detachment of flexible linear heteropolymers from solid surfaces. Desorption rates were measured using temperature programmed desorption (TP…
We examined the effects of a fragment of the substrate binding domain of DnaK on protein refolding from chemically denatured states. The fragment DnaK384-638, containing a full-length substrate binding domain, tightly binds to the unfolded protein in solution. The effects of DnaK384-638 on the reactivation of beta-gal…
The temperature dependence of the ferroelectric and dielectric properties of PbZr0.5Ti0.5O3 thin films deposited on LaNiO3-coated SrTiO3 substrate was investigated. The results showed that both the saturation polarization and remanent polarization increased with decreasing temperature from 300 to ∼50 K, and decreased…
Two new N-salicylidene-N'-aroylhydrazines ligands have been prepared: N-4-diethylaminosalicylidene-N'-4-nitrobenzoyl-hydrazine (L(1)) and N-4-diethylaminosalicylidene-N'-4-(4-nitrophenylethylidene)-benzoyl-hydrazine (L(2)). The ligands are properly functionalized with strong electron donor-acceptor groups and are of p…
We have performed fatigue tests on lead zirconate titanate (PZT) multilayers having stacks of Pb(Zr0.8Ti0.2)O3/Pb(Zr0.2Ti0.8)O3 with repeated distances of 12 formula groups. The results are compared with single-layer n-type (0.5 at. % Ta-doped) PZT films. We conclude that fatigue is dominated by space-charge layers in…
Two cyano-bridged Ni(II)-Fe(III) complexes [(H(3)O)[Ni(H(2)L)](2)[Fe(CN)(6)](2).[Fe(CN)(6)].6H(2)O](n) (1) and [K(18-C-6)(H(2)O)(2)][Ni(H(2)L)](2)[Fe(CN)(6)](3).4(18-C-6).20H(2)O (2) (L = 3,10-bis(2-aminoethyl)-1,3,6,8,10,12-hexaazacyclotetradecane, 18-C-6 = 18-crown-6-ether) have been synthesized and characterized st…
An all-solid-state electrochromic device composed of WO3 and Ni(OH)2 with a Ta2O5 protective layer was prepared by rf magnetron sputtering and lamination with a proton-conducting solid polymer electrolyte. This device had good durability, high transmittance modulation (18%–74%) and coloration efficiency (about 84 cm2…
Third-harmonic generation from solid samples of carbon nanotubes has been studied experimentally, using ultrashort pulses generated by a Cr:Forsterite laser, at a wavelength of 1250 nm. The results show an unusual nonperturbative behavior of the third-harmonic yield, for relatively low input laser fields, of ∼1010 W/c…