Materials Literature
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Abstract A series of pyridine‐containing poly(imide‐siloxane) (PIS) copolymers with different amounts of PDMS with various segmental lengths were synthesized from 2,6‐diaminopyridine (DAP), α,ω′‐aminopropylpoly(dimethylsiloxane) (PDMS), 1,3‐bis(4‐aminophenoxy)benzene (APB), and 4,4′‐oxydiphthalic dianhydride (ODPA). A…
The rare-earth tricyanomelaminates, [NH(4)]Ln[HC(6)N(9)](2)[H(2)O](7)xH(2)O (LnTCM; Ln=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy), have been synthesized through ion-exchange reactions. They have been characterized by powder as well as single-crystal X-ray diffraction analysis, vibrational spectroscopy, and solid-state (1)H,…
Erzeugen und schützen: Die Hohlraumhülle eines Molybdän/Wolfram-Speicherproteins fungiert als polytoper Wirt für eine Vielzahl an Polyoxowolframatgästen, von denen die meisten nichtkovalent gebunden sind und als einzelne getrennte Cluster erscheinen (einer ist gezeigt: gelb W, rot O, Band: Protein), während ihre Bildu…
In this paper, the authors discuss one- and three-dimensional space charge distributions in glass fibre/epoxy resin composites. By the conventional pulsed electroacoustic (PEA) method, only a one-dimensional distribution of the average charge over a whole area parallel to the two electrodes can be observed. Therefore,…
Non‐isothermal crystallization techniques are frequently used to determine the kinetic parameters for crystallization in glasses. The techniques are experimentally simple and quick, compared with isothermal techniques. However, the analytical models used for non‐isothermal data analysis, that were derived from models…
The paper presents the results of ab initio calculations of formation energies of vacancy and small vacancy complexes in beryllium. Particular attention is paid to the justification of the relevant computation parameters and the evaluation of the total and vacancy formation energy convergence. The vacancy formation en…
Results are presented that have been obtained while operating the graphite hollow cathode duoplasmatron ion source in dual mode under constant discharge current. This dual mode operation enabled us to obtain the mass and emission spectra simultaneously. In mass spectra C 3 is the main feature but C 4 and C 5 are also…
2.5D SiC f /SiC composites were produced by a modified polymer infiltration and pyrolysis process. Fine Al and SiC powders were first infiltrated into large inter‐bundle pores. During pyrolytic decomposition of the polymer, the active Al filler reacts with small carbon‐bearing polymer fragments, and reactive nitrogen…
Phonon modes in $\mathrm{Pb}{\mathrm{Mg}}_{1∕3}{\mathrm{Nb}}_{2∕3}{\mathrm{O}}_{3}$ relaxor are studied by backward and near-forward hyper-Raman scattering technique. Polar mode frequencies obtained from hyper-Raman experiment fully agree with results of infrared spectroscopy. An additional mode observed in cross-pola…
Intraannular ring alternation in heterogeneously substituted cyclotriphosphazenes is investigated using both ab initio and density functional methods. Comparisons of the calculated geometries for N3P3X6 (X = H, F, Cl, Me, Ph) and N3P3X4Y2 (X = F, Cl; Y = Me, Ph, X, Cl) with experimental X-ray data establish the utilit…
We investigate the thermodynamical properties of an adapted ANNNI-like (axial next nearest neighbour Ising-like) model for 1D spin crossover solids. We performed an exact treatment within the framework of the well known transfer matrix method and derived the thermal evolution of the high spin fraction, the correlation…
To verify effectiveness for a magnetic refrigerant, we have fabricated spheres of La(Fe 0.86 Si 0.14 ) 13 by a rotating electrode process (REP). The Curie temperature of the spheres was increased up to around room temperature by hydrogen absorption. Putting these spheres into an active magnetic regenerator (AMR) test…
Mixed cyclization of 3-mono-, 4-mono-, or 4,5-di(porphyrinated) phthalonitrile compounds 2, 3, or 6 and unsubstituted phthalonitrile with the half-sandwich complex [EuIII(acac)(Pc)] (Pc=phthalocyaninate, acac=acetylacetonate) as the template in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in n-pentanol aff…
Real‐time small‐angle neutron scattering (SANS) and neutron diffraction (ND) studies have been performed on a calcium fluorapatite (Ca 5 (PO 4 ) 3 F) (FAP) glass–ceramic composition. The cast glass exhibited scattering at low q and a peak in I ( q ) at higher q . The scattering at low q is thought to arise from a larg…
Organic-metal hybrid nanowires were synthesized by cooperative self-organization of the one-dimensional stacking of tetrathiafulvalene (TTF) via charge-transfer interaction with metallic gold originating from the redox reaction between TTF and gold ions. The nanowires can be easily obtained as purple precipitates just…
Abstract Reclaimed rubber powder (RRP) was treated by the addition of maleic anhydride (MA) to impart desired properties suitable for self‐adhesive sheets and concrete lining applications. The produced MA‐RRP was mixed with natural rubber (NR) with various compositions. A fixed 1 : 1 blend ratio of NR : RRP was reinfo…
The effects of oxygen plasma treatment on epitaxial ZnO thin films grown by molecular beam epitaxy were studied. The Au–ZnO–In junction exhibiting ohmic behaviour before the treatment gradually changes to a Schottky junction with the increase in oxygen plasma treatment time. The crystallinity and the surface microstru…
The room-temperature synthesis of beta-Ga2O3 nanocrystal was examined by coupling two biomimetic crystallization techniques, enzymatic peptide nanoassembly templating and aggregation-driven crystallization. The catalytic template of peptide assembly nucleated and mineralized primary beta-Ga2O3 crystals and then fused…
With maleic anhydride-modified PS (m-PS) microspheres as a template (core) and zinc nitrate and diethanolamine (DEA) as the starting materials, the m-PS/ZnO core−shell structure was synthesized by a wet chemical route. ZnO clusters were synthesized through controlled hydrothermal decomposition of Zn-DEA chelate at 70−…
Solvate-free sodium octahydrotriborate, NaB3H8, is prepared on a 20 gram scale from sodium amalgam and diborane in diethyl ether. This substance, which is chemically related to borohydride-based compounds being investigated as hydrogen storage materials, is also useful for the preparation of transition-metal complexes…