Materials Literature
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우라닐 이온, <TEX>$UO^+_2$</TEX>와 Schiff-base 와의 착화합물이 글리실글라이신과 살리실알데히드, 2-히드록시-1-나프트알데히드, 2,3-디히드록시 벤즈알데히드 그리고 2,4-디히드록시 벤즈알데히드와의 축합에 의해 합성되었으며 이들 착화합물의 특성을 원소분석, 전도도 측정, 자기화율 측정, UV, IR, NMR 스펙트라와 DTA, TG, DSC 결과를 이용하여 조사하였다. 구조와 열분해 메카니즘이 제안되었다. Complexes of uranyl ion <TEX>$UO^{+2}_2$</TEX>with Schiff-bases obtained by…
The title compound is composed of one-dimensional polymeric [[Er(2)(C(12)O(12))(H(2)O)(10)].4H(2)O](n) chains containing Er in a slightly distorted antiprismatic eightfold coordination. The benzenehexacarboxylate ion is located about an inversion centre. Water molecules of crystallization, linked by hydrogen bonding t…
In this paper, the kinetics and morphology of viscoelastic microphase separation of diblock copolymers are investigated in detail. It is found that for a symmetric system ( f = 0.5), taking into account the bulk modulus differences between the two blocks, the classical randomly oriented lamellar morphology is not obse…
To find the origin of the diffusion channels observed in sodium silicate glasses, we have performed classical molecular dynamics simulations of Na 2 O–4SiO 2 during which the mass of the Si and O atoms has been multiplied by a tuning coefficient. We observe that the channels disappear and that the diffusive motion of…
We performed partial oxidation, steam reforming, and CO 2 reforming of CH 4 to synthesis gas, using oxidized-diamond-supported group VIII metal catalysts, to investigate the properties of oxidized diamond as a support material and to avoid carbon deposition on a metal-loaded catalyst. Nickel (5 wt %)/oxidized diamond…
Neutron scattering has been used to study static and dynamic magnetic properties of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ with $x=0.09$ and $0.125.$ The $x=0.09$ compound appears as a limit case of an inhomogeneous canted antiferromagnetic (CAF) A-type structure. Related to the mean AF…
Poly(trimethylene carbonate) (PTrMC) is a member of poly(alkylene carbonate) represented by the chemical formula [−(CH 2 ) m OC OO−] n . PTrMC is found to be a synthetic rubber, which is amorphous in the relaxed state and crystalline in the stretched state. PTrMC can be synthesized enzymatically and therefore can be c…
3,5-Bis(4-fluorobenzoyl)phenol was polycondensed under various reaction conditions. Low molecular weights were obtained ( M n < 8000 Da), and MALDI−TOF mass spectrometry indicated that the chain growth was limited by cyclization. In the best mass spectra the cyclic, hyperbranched poly(ether ketone)s were detectable up…
Ab initio calculations have been performed to study the electronic band structure and ferromagnetic properties of the organic radical $p\ensuremath{-}\mathrm{NPNN}.$ The density of states, the total energy, and the spin magnetic moment were calculated. The calculations revealed that the $\ensuremath{\delta}$ phase of…
The diffusion of different deuterium-labeled (OD) low-molecular-weight alcohols and D 2 O in Nylon 11 has been investigated by monitoring the NH/ND exchange in the polymer by Fourier transform near-infrared (FTNIR) spectroscopy. The results demonstrate that the diffusion process of the different penetrants is strongly…
The total vapor pressures of the erbium trihalides ErCl 3, ErBr 3, and ErI 3 were measured by the torsion method, and their temperature dependences can be expressed by the following equations over the given temperature ranges: ErCl 3 (s), log( p /kPa) = 12.04 ± 0.15 − (15159 ± 200)(K/ T ) from (880 to 1040) K; ErBr 3…
Ring-opening polymerization (ROP) of 2,2,4,4,6,6-hexamethyl-8,8-divinylcyclotetrasiloxane ( I ) initiated by both 1- tert -butyl-4,4,4-tris(dimethylamino)-2,2-bis[tris(dimethylamino)phosphoranylidenamino]-2λ 5,4λ 5 -catenadi(phosphazene) (C 22 H 63 N 13 P 4, P 4 - t -Bu superbase) and trifluoromethanesulfonic acid (CF…
20 nm diameter Fe–Co nanowire arrays with different composition were fabricated by electrodeposition. A nanoporous anodized aluminium oxide film was used as the substrate. The microstructure and magnetic properties were studied by x-ray fluorescence, transmission electron microscopy, x-ray diffraction and vibrating sa…
Structures and phase transition in the layered perovskite La0.6Sr0.1TiO3: a new orthorhombic structure solved from high-resolution diffraction in combination with group theoretical analysis, Christopher J Howard, Zhaoming Zhang
A chimie douce route based on successive redox and exchange reactions has allowed us to prepare new hybrid organic-inorganic materials, composed of polyacrylate macromolecules intercalated into layered double hydroxides (LDHs), deriving from Ni(OH)(2). Monomer intercalation and in situ polymerization mechanisms have a…
Combinatorial screening of materials formulations followed by the scale-up of combinatorial leads has been applied for the development of high-performance coating materials for automotive applications. We replaced labor-intensive coating formulation, testing, and measurement with a "combinatorial factory" that include…
The hydrolysis of terminal (t)butyl-ester groups provides the novel nonadentate podand tris[2-[N-methylcarbamoyl-(6-carboxypyridine-2)-ethyl]amine] (L13) which exists as a mixture of slowly interconverting conformers in solution. At pH = 8.0 in water, its deprotonated form [L13 - 3H](3-) reacts with Ln(ClO(4))(3) to g…
Uniform finite facets are frequently observed at grain boundaries (GBs) and are usually attributed to equilibrium stabilization by GB stress. We report calculations for an aluminum twin GB using density functional theory, the embedded-atom method, and continuum elasticity theory. These methods show that GB stress is m…
In this work, Mn-doped PbSe nanocrystals (NCs) have been, for the first time, prepared through a high-temperature organic solution approach. To ensure that all the Mn2+ ions are indeed incorporated into the NCs and not only physically presented at the surface, Mn-Se prebonded precursor was selected, and a ligand-excha…
A model system involving a synthetic polyamide fiber and a water-soluble polymer for the selective nucleation of polymorphs of calcium carbonate crystals under specific experimental conditions is described. The functional groups at the surface of both commercially available and chemically modified polyamide fibers ind…