Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The growth of single wall carbon nanotubes (SWNTs) mediated by metal nanoparticles is considered within (i) the surface diffusion growth kinetics model coupled with (ii) a thermal model taking into account heat release of carbon adsorption-desorption on nanotube surface and carbon incorporation into the nanotube wall…
Aging characteristics of 0.2(PbMg1/3Nb2/3O3)-0.8(PbZr0.475Ti0.525O3) multilayer ceramic actuators have been investigated by applying rectified ac bias. Multilayer ceramic actuators 5×5×5 mm3 in size were fabricated by tape-casting methods. X-ray diffraction analyses were performed to compare crystalline structures and…
The crystal structure of [C(6)H(5)NH(CH(3))(2)](2)Te(2)I(10) consists of the N,N-dimethylanilinium cation and a hitherto unreported tellurium iodide anion Te(2)I(10)(2)(-) [crystal data: C(8)H(12)NTeI(5), monoclinic, P2(1)/c, a = 9.4787(2) A, b = 14.2874(3) A, c = 13.6869(3) A, beta = 95.1918(8) degrees, V = 1845.96(7…
Photoluminescence (PL) spectra of freshly etched and ambient-aged porous silicon specimens have been measured and analyzed to extract spectral contributions due to quantum confinement (QC) and non-QC effects. It is shown that all spectra can be deconvolved into five Gaussian bands with typical peak energies 1.59, 1.76…
The first slipped pseudo-quadruple-decker complex of phthalocyanines was formed unexpectedly upon treatment of the protonated double-decker SmIIIH(Pc)[Pc(alpha-OC4H9)8] with NaOH. The supramolecular structure contains two double-decker units linked by two sodium ions by an extremely rare coordination mode of phthalocy…
Biaxial strain during nucleation influences phase separation into ferromagnetic (metallic) and nonferromagnetic (insulating) regions and that, in turn, markedly affects the electric transport of a manganite film. A 40-nm-thick La0.67Ca0.33MnO3 film, coherently constrained by a (001)LaAlO3 substrate, possesses a notice…
In this paper properties of nematic liquid crystals aligned on polyimide surfaces exposed to a low-energy Ar ion beam are investigated. We studied how the pretilt angle of a liquid crystal cell is affected by ion-beam conditions, such as the energy of the incident ions, the angle of incidence, and the exposure time. X…
Ion irradiation experiments of diamond samples at room temperature have been performed by using in situ Raman spectroscopy as diagnostic technique. Different ions are used with energies of 200 or 400 keV. The area of virgin diamond Raman band (at 1332 cm−1) decreases exponentially as the ion fluence increases. This is…
Near-equiatomic NiTi shape memory alloys normally exhibit three martensitic transformations among three phases: the B2 phase, the monoclinic (M) phase and the rhombohedral (R) phase. Some recent work, however, has revealed complex transformation behaviour involving multiple-stage martensitic transformations and multip…
We studied the influence of adsorbates on field emission (FE) properties of well-aligned ZnO nanoneedle arrays with varying initial electric field, vacuum gap, and ambient pressure. The FE current exhibits hysteresis upon a loop of applied voltage. On applying an initial electric field of 3.85×106 V/m, the turn-on vol…
The electrodeposition and characterization of conducting thin films of gold nanoparticles bridged with oligothiophene linkers are reported. Gold nanoparticles capped with the conjugated phosphines 5-diphenylphosphino-2,2‘:5‘,2‘ ‘-terthiophene ( d core = 1.7 ± 0.3 nm) and 5-diphenylphosphino-3‘,4‘-ethylenedioxy-2,2‘:5‘…
Structural phase transition in In2W3O12 has been studied using differential scanning calorimetry, dilatometry, and Raman spectroscopy. The phase transition at 523 K has been found to be of first order with a heat of transition of 1.22 kJ/mole. In contrast to the earlier reports, the present dilatometric studies sugges…
Polycrystalline Bi2Te3 nanowires with diameter about 50 nm have been assembled into the nanopores of alumina template by electrodeposition in the solution containing Bi3+ and HTeO2+ with porous alumina template as a cathode. X-ray photoelectron spectroscopy, high-resolution electron microscopy, and selected area elect…
The synthesis, characterization, and catalytic ability of gold/bismuth (Au/Bi) core/shell nanocrystals for promoting asymmetric 1D nanowire growth is described. A biphasic gold reduction approach is initially used to create small (∼1.5 nm diameter) Au particles passivated with trioctylphosphine (TOP). The alkylphosphi…
We have investigated the structural, optical, and vibrational properties of strained heteroepitaxial ZnO layers by high resolution x-ray diffraction, reflectivity, and Raman measurements. The ZnO layers were grown by metalorganic vapor phase epitaxy on sapphire substrates under varying growth conditions. A Poisson num…
Nanoscale Au/Fe 2 O 3 catalysts for CO oxidation were prepared by a deposition–precipitation technique using the thermal decomposition of urea. Freshly precipitated amorphous Fe(OH) 3 was used as a support. The resulting products were characterized by transmission electron microscopy and x-ray powder diffraction. The…
We introduce in this paper a phenomenological model (Havriliak-Negami function) to describe the relaxation of the intercalated Li ions into amorphous WO3 electrochromic films. Kinetic behavior of intercalation was analyzed by a combined measurement of electrochemical impedance and modulated transmittance. The frequenc…
Silver nanoshells on styrene–acrylic acid copolymer latex spheres (PSA) were deposited by an in situ chemical reduction method, ageing a colloid solution at 85 °C containing PSA latex, AgNO 3 , urotropine, and poly-(vinylpyrrolidone). SEM and TEM observations showed that the silver nanoshells were made of closely pack…
Undecanuclear copper clusters, [Cu(11)(micro(9)-Se)(micro(3)-Br)(3)[Se(2)P(OR)(2)](6)] (R = Et, Pr, (i)Pr) (1a-c), were isolated along with closed-shell ion-centered cubes, [Cu(8)(micro(8)-Br)[Se(2)P(OR)(2)](6)] (PF(6)) (2a-c) and [Cu(8)(micro(8)-Se)[Se(2)P(OR)(2)](6)] (3a-c), from the reaction of [Cu(CH(3)CN)(4)](PF(…
The crystalline structures of polyesters 4 8, 4 10, and 4 12 have been studied using X-ray and electron diffraction and real space electron microscopy. They belong to the series of polyesters derived from 1,4-butanediol and even-dicarboxylic acids. This work allows the previously reported data on polyesters 4 4 and 4…