Materials Literature
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Wahrscheinliche Reaktionswege für die Epoxidierung von Propylen mit O2 und H2 in Gegenwart von Trimethylamin auf einem trimethylsilylierten Au-Ba(NO3)2/Titanosilicat-Katalysator werden vorgestellt (siehe Bild). Der Einsatz von Trimethylamin als Gasphasenpromotor und von Goldnanopartikeln ergibt eine einstufige Propyle…
Abstract Moisture absorptions of filled silicone rubber (SiR) under strong electrolyte have been investigated in the temperature range of 25–60°C by weight‐gain experiments. Tests were performed with the materials exposed to NaCl, HNO 3 solution, and deionized water. The diffusion results have been analyzed in terms o…
Silicon carbide–carbon nanotube composite was fabricated using the high pressure reactive sintering technique. Samples were synthesized at high pressures, 2 and 8 GPa, and temperatures, 1770 and 1970 K. Their structures were studied using x-ray diffraction, x-ray photoelectron spectroscopy, transmission electron micro…
This study presents investigations on new approaches to novel biodegradable amphiphilic poly(L-lactide)-b-dendritic poly(L-lysine)s bearing well-defined structures. First, two new Boc-protected poly(L-lysine) dendron initiators G(2)OH 4 (generation = 2) and G(3)OH 6 (generation = 3) with hydroxyl end functional groups…
Phosphate (PKBAN: P2O5+K2O +BaO +Al2O3+Nd2O3) and fluorophosphate (PKBFAN: P2O5+K2O +BaO +BaF2+Al2O3+Nd2O3 and PKBAFN: P2O5+K2O +BaO +Al2O3+AlF3+Nd2O3) glasses were prepared with three concentrations (0.1, 1.0 and 2.0 mol%) of Nd3+ ions and their detailed luminescence properties have been investigated. Absorption spec…
Abstract Three novel heteropolyoxovanadates, [Ni(2,2′‐bpy) 3 ] 2 [{Ni(en) 2 }As 6 V 15 O 42 (H 2 O)] · 9.5H 2 O ( 1 ), [Zn 2 (dien) 3 (H 2 O) 2 ] 1/2 {[Zn 2 (dien) 3 ]As 6 V 15 O 42 (H 2 O)} · 2H 2 O ( 2 ), and [Co(enMe) 2 ] 3 [As 6 V 15 O 42 (H 2 O)] · 2H 2 O ( 3 ), were hydrothermally synthesized and characterized b…
Synthesis, structural characteristics, magnetic studies and DFT calculations in Ni(II) dinuclear complexes containing two bridging N3- and an O-H...O linkage reveal the existence of ferromagnetic interactions between Ni(II) centers via N3- ligands and antiferromagnetic interactions through the H-bonded moiety. The ove…
We present a novel nanotube-on-insulator (NOI) approach for producing high-yield nanotube devices based on aligned single-walled carbon nanotubes. First, we managed to grow aligned nanotube arrays with controlled density on crystalline, insulating sapphire substrates, which bear analogy to industry-adopted silicon-on-…
Abstract The miscibility, crystallization kinetics, and mechanical properties of a novel low T g phosphate glass (Pglass)/polyamide 6 hybrid material were investigated. Here, we report the first evidence for miscibility of inorganic phosphate glass and organic polymer prepared by blending both components in the liquid…
[(TPA)(OH)FeIIIOFeIII(OH)(TPA)][Fe(CA)3]0.5(BF4)0.5.1.5MeOH.H2O (1) which possesses both the [FeIII(CA)3]3- (CA= chloranilate) and hydroxooxoiron(III) ions has had its structure determined by single-crystal X-ray diffraction. The 2-300 K magnetic susceptibility of 1 provides the magnetic parameters, g = 2.07, J/kB = -…
This paper presents a comparison of the bulk structure, cleavage energies, and local densities of states of solid NaAlH4 calculated using several different density functional theory methodologies. Good agreement is obtained for the bulk crystal structure. Larger differences become apparent for the calculated surface e…
Abstract Reactions of K 4 [SnSe 4 ], Na 4 [GeS 4 ] or Ba 2 [GeSe 4 ] with different 1,2‐diaminoethane (= en ) coordinated complexes of CrCl 3 ([Cr( en ) 2 Cl 2 ]Cl or [Cr( en ) 3 ]Cl 3 ) in MeOH or aqueous solution yielded three novel compounds that contain complexes of Cr 3+ with ortho ‐chalcogenotetrelate anions [E′…
The crystal structure of type III KGd(PO 3 ) 4 has been solved, and the related data are presented in this paper. KGd(PO 3 ) 4 (KGP) is monoclinic and has P 2 1 as space group. Its cell parameters are a = 7.255(4) Å, b = 8.356(5) Å, c = 7.934(5) Å, β = 91.68(5)°, and Z = 2. KGP is characterized by infinite polyphospha…
A new asymmetrically coordinated bis-trinuclear iron(III) cluster containing a [Fe(3)O](7+) core has been synthesized and structurally, magnetically, and spectroscopically characterized. [Fe(6)Na(2)O(2)(O(2)CPh)(10)(pic)(4)(EtOH)(4)(H(2)O)(2)](ClO(4))(2).2EpsilontOH (1.2EpsilontOH) crystallizes in the P space group an…
Formation of spontaneous polarization in one-dimensional (1D) structures is a key phenomenon that reveals collective behaviors in systems of reduced dimensions, but has remained unsolved for decades. Here we report ab initio studies on finite-temperature structural properties of infinite-length nanowires of Pb(Zr0.5Ti…
Abstract Two iron( II ) complexes, namely [Fe 4 (L) 2 ] · H 2 O ( 1 ) and [Fe 10 (L) 4 Cl 4 ] · 2H 2 O ( 2 ), have been synthesised under solvothermal conditions by treating p ‐ tert ‐butylthiacalix[4]arene (LH 4 ) with FeCl 2 in methanol. Compound 1 crystallises in the orthorhombic system (space group Immm ) with the…
Abstract A Haake torque rheometer equipped with an internal mixer has been used to study the influence of microscale calcium carbonate (micro‐CaCO 3 ) and nanoscale calcium carbonate (nano‐CaCO 3 ) on the fusion, thermal, and mechanical characteristics of rigid poly(vinyl chloride) (PVC)/micro‐CaCO 3 and PVC/nano‐CaCO…
It is shown that nanopores are formed during desorption of NH3 from Mg(NH3)6Cl2, which has been proposed as a hydrogen storage material. The system of nanopores facilitates the transport of desorbed ammonia away from the interior of large volumes of compacted storage material. DFT calculations show that there exists a…
Crystallization processes in indomethacin can be observed below Tg leading to different forms depending on the thermal treatment: a rapid and deep quench below Tg leads to the metastable alpha-phase and a slow cooling close to Tg gives rise to the stable gamma-phase. To understand this atypical behavior, we have studi…
A new series of [mu-tris-{1,n-bis(tetrazol-1-yl)alkane-N4,N4'}iron(II)] bis(perchlorate) spin-crossover coordination polymers ([Fe(nditz)3](ClO4)2]; n = 4-9) has been synthesised and characterised. The ditetrazole bridging ligands provide octahedral symmetry at the iron(II) centres while allowing the distance between…