Materials Literature
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© 2012 Chan et al., licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Poly(trim…
A new antireflective silica film with closed mesopores was successfully prepared for the optical elements used in vacuum of a high-power laser system. The ordered cagelike mesopores were formed with the direction of surfactant F127 and then closed by long-chain fluoroalkylsilane. The grazing incident x-ray diffraction…
N,N-Dimethyl-N'-(6-oxo-2-thioxo-1H-pyrimidine-4-yl)formamidine has been synthesized and introduced as a substituent in poly(vinyl chloride) (PVC) chains via a chemical reaction. Both the dimethyl derivative and the modified PVC have been characterized via spectroscopic analyses and their biological activities have bee…
Fe-ZSM-5 has been systematically investigated as catalyst for the selective catalytic reduction (SCR) of NO with NH(3), concentrating on the active sites, the deactivation mechanism during hydrothermal aging and the chemical possibilities to stabilize this type of SCR catalyst. Regarding the active SCR sites, it could…
We present computations of the zero field splitting constants in a tris-hydroxo bridged chromium dimer (Kremer's dimer). A comparison is given of broken symmetry density functional theory (DFT) and multiconfigurational ab initio methods for evaluating ZFS constants. Kremer's dimer is known to be antiferromagnetically…
The transmission properties of a one-dimensional photonic crystal containing uniaxial indefinite metamaterial are investigated using the transfer matrix method. It is shown that the photonic bandgaps of the structure strongly depend on the orientation of the optical axis of the indefinite metamaterial. The results sho…
The foundations of polyesters were laid by Carothers and Hill at the beginning of the 1930s [1]. Carothers and Hill synthesized polyesters with low melting temperatures (m.t.) and hydrolytically sensitive, such as the polyester produced from propylene glycol and hexadecanedicarboxylic acid, m.t. 75°C, w-hydroxydecanoi…
Synthesis of metal nanoparticles (NPs) using plant extracts as reducing agents is of great interest due to its ease and environmental friendly process. Reports show biogenic green synthesis reaction times in forming gold metal nanoparticles (Au NPs) varying from minutes to several hours. In this article, an instantane…
ABSTRACT The crystal growth shape (CGS) and equilibrium crystal shape (ECS) of silicon in Si melt are observed using in situ observation. Fully faceted silicon CGSs, which are dominated by the {111} facets, are observed from the {112} and {110} orientation. Silicon CGS in three‐dimensional in Si melt is octahedral in…
Abstract A mixed‐valent [Mn 12 ] complex with an unprecedented [Mn III 4 Mn II 8 (μ‐OCH 3 ) 4 ] core was obtained by oxidation of MnCl 2 in the presence of salicylaldoxime (saoH 2 ). This complex adopts a rare topology based on a central [Mn II 4 ] cage decorated by four dinuclear [Mn II –Mn III ] motifs. Studies of t…
Multiferroic ( Bi 0.95 La 0.05 )( Fe 0.97 Mn 0.03 ) O 3 / CoFe 2 O 4 and CoFe 2 O 4 /( Bi 0.95 La 0.05 )( Fe 0.97 Mn 0.03 ) O 3 double‐layered thin films were prepared on Pt (111)/ Ti / SiO 2 / Si (100) substrates via a chemical solution deposition method. In both the thin films, superior multiferroic properties were…
Phase diagram of the Al 2 O 3 –HfO 2 –Er 2 O 3 system was constructed for the first time in the range of 1600°C–2800°C by methods of X‐ray analysis at ambient temperatures, petrography, DTA in H 2 at temperatures to 2300°C, and electron microprobe X‐ray analysis and presented as isothermal sections at 1250°C and 1650°…
本文利用固相反应法制备了Sr 4 Al 14 O 25 :(Eu 2+ , Dy 3+ )长余辉夜光材料, 并研究了H 3 BO 3 含量、固相反应温度和Eu含量对Sr 4 Al 14 O 25 :(Eu 2+ , Dy 3+ )长余辉夜光材料性能的影响. 实验结果表明, H 3 BO 3 含量对蓝绿发射的Sr 4 Al 14 O 25 相的形成至关重要. 在固相反应温度为1400℃, H 3 BO 3 含量为10at%, Eu/Al原子比为0.03的优化条件下, 获得了发射波长为490 nm, 余辉时间长达24 h以上的Sr 4 Al 14 O 25 夜光粉. 发光强度与Eu含量的关系证明, Sr 4 Al 14 O 25 相的…
The present work is aimed at the elaboration of the model of magnetic properties and magnetic relaxation in the mononuclear [Pc(2)Tb](-)TBA(+) complex that displays single-molecule magnet properties. We calculate the Stark structure of the ground (7)F(6) term of the Tb(3+) ion in the exchange charge model of the cryst…
Space-filling assemblies of athermal hydrophobic particles floating at an air-water interface, called particle rafts, are shown to undergo an unusual phase transition between two amorphous states, i.e., a low density "less-rigid" state and a high density "more-rigid" state, as a function of particulate number density…
Abstract The formation of the thioantimonates [M(tren)Sb 4 S 7 ] (M = Fe, Zn; tren = tris(2‐aminoethyl)amine) has been studied with in‐situ energy dispersive X‐ray diffraction (EDXRD) under solvothermal conditions. Up to 60 % amine concentration the compound [Fe(tren)Sb 4 S 7 ] coexists with an unknown crystalline mat…
Wissen, worauf es ankommt: Das einfachste Photosyntheseprotein, das Sonnenlicht in andere Energieformen umwandelt, wurde kovalent mit einem maßgeschneiderten organischen Farbstoff verknüpft, um einen voll funktionsfähigen Hybridkomplex zu erhalten, der das natürliche System hinsichtlich der Lichtsammlung und -umwandlu…
We performed detailed resistivity and impedance spectroscopy studies of epitaxial (100) VO${}_{2}$ films. As the metal-insulator transition (MIT) is approached from below, the dielectric constant collapses concomitantly with a sharp increase in conductivity, revealing the coexistence of metallic and insulating phases.…
Nanocrystalline Ni 1− x Zn x Fe 2 O 4 (0 ≤ x ≤ 1.0) powder with grain size of 30 nm was prepared using the spraying‐coprecipitation method. The obtained nanocrystalline Ni 1− x Zn x Fe 2 O 4 powder was sintered using conventional and microwave sintering techniques. The results show that the microstructure and magnetic…
The structure of the hydrogen bond network is a key element for understanding water's thermodynamic and kinetic anomalies. While ambient water is strongly believed to be a uniform, continuous hydrogen-bonded liquid, there is growing consensus that supercooled water is better described in terms of distinct domains with…