Materials Literature
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The interaction of hydrous cerium oxide with cationic surfactants under basic conditions is used for the first time in the preparation of CeO2 with enhanced textural and redox properties. The reduction of Ce4+ to Ce3+ is strongly augmented, especially in the low-temperature regime, resulting in a broadening of the win…
Abstract Plasticizers play a key role in the formulation of semirigid and flexible PVC and in determining their physical properties and processability. This study examines the effects of the low phr levels of plasticizer (DOP) on the rheological and mechanical properties of rigid and semi‐rigid PVC/newsprint‐fiber com…
A polystyrene–polyisoprene (PS–PI) diblock copolymer (10,000–50,000 g/mol) and a matched PS&ndashPI–PS triblock (10,000–100,000–10,000 g/mol) were employed to study the effect of chain architecture on the rheological response of ordered block copolymer melts. Both samples adopt hexagonal microstructures with PS cylind…
Magnetoresistance measurements have been carried out on single-crystal sample of the transition-metal Zintl compound Eu 14 MnSb 11 . Eu 14 MnSb 11 is the first compound of the Ca 14 AlSb 11 structure type in which magnetoresistive effects have been measured. Colossal magnetoresistance (CMR) at 92 K and 5 T with Δρ/ρ(0…
The magnetization of the $\mathrm{Co}({\mathrm{S}}_{1\ensuremath{-}x}{\mathrm{Se}}_{x}{)}_{2}$ system with $0<~x<~0.2$ has been measured under high magnetic fields and high pressure. Ferromagnetic ${\mathrm{CoS}}_{2}$ exhibits a second-order transition at ${T}_{c}=122\mathrm{K}.$ Substitution of 10% Se for S in…
Four model compounds (U s, U u, UE ex, and UE in ) and two polyurethanes (PU 1 and PU 2 ) were prepared to monitor the hydrogen-bond (H-bond) interactions of urethane−urethane and urethane−ester (including external and internal esters). The results from differential scanning calorimetry (DSC) and X-ray diffraction sug…
A thin layer electrode of birnessite-type manganese oxide was prepared by brushing a mixed solution of KOCOCH 3 and Mn(OCOCH 3 ) 2 on a platinum substrate, followed by heating at 1073 K. The chemical composition of the electrode was K x MnO y ( x = 0.33 and y ∼ 2) with an interlayer spacing of c 0 = 0.697 nm. The posi…
[M(en)(3)]Sb(2)S(4) (M = Co, Ni) and [M(en)(3)]Sb(4)S(7) (M = Fe, Ni) were prepared from the MX(2)/Na(3)SbS(3)/en system (X = Cl, Br; en = ethylenediamine) under hydrothermal conditions. Orange-yellow [Ni(en)(3)]Sb(2)S(4) (1) crystallizes in the monoclinic space group P2(1)/c (No. 14) with a = 10.538(2) Å, b = 14.460(…
A double water-in-oil-in-water emulsion system was used as a biomimetic environment for the preparation of calcium carbonate particles. Calcium ions were extracted from an external aqueous phase (calcium nitrate solution) into the organic membrane phase (kerosene containing Span 83 as a surfactant and bis(2-ethylhexyl…
Manganese ion-planted MCM-41 was prepared by a “template-ion exchange” method, in which the template ion in as-synthesized MCM-41 was exchanged for Mn2+ ion in an aqueous solution, and the resulting sample was calcined at 873 K. This method was accompanied with no collapse of mesoporous structure. The content of the m…
Ultrafine powders of chromium oxide (Cr 2 O 3 ) and manganese oxide (Mn 2 O 3 ) have been prepared at room temperature by the sonochemical reduction of an aqueous solution containing ammonium dichromate [(NH 4 ) 2 Cr 2 O 7 ] and potassium permanganate (KMnO 4 ), respectively. The yield of the sonochemical reduction ha…
We report on the systematic magnetization measurements performed on the stoichiometric Gd monopnictides, ( = N, P, As, Sb, and Bi), at temperatures between 1.6 and 350 K in magnetic fields up to 42 T. GdN shows the ferromagnetic behaviour with a Curie temperature . The other samples order antiferromagnetically at the…
The synthesis of new semifluorinated alkyl side-chain ionenes (SFASI) is reported and involves reaction of semifluorinated 1-bromoalkanes with poly( N, N ‘-dimethyl-1,6-hexanediamine) (PDHD) which was prepared by reduction of poly( N, N ‘-dimethylhexamethyleneadipamide). The quaternization efficiency of the polyamine…
The FOCUS method, in which both crystal chemical information and powder diffraction data are included in the structure determination process, is presented. FOCUS combines automatic Fourier recycling with a specialized topology search specific to zeolites, which can be described as having three-dimensional four-connect…
In the iron(II) spin-crossover compound [Fe(ptz) 6 ](BF 4 ) 2, the thermal spin transition is accompanied by a crystallographic phase transition showing a hysteresis with T c ↓ = 128 K and T c ↑ = 135 K at ambient pressure [Franke, P. L.; Haasnot, J. G.; Zuur, A. P. Inorg. Chim. Acta 1982, 59, 5]. The hysteresis is du…
Three polymorphic modifications A-C of [Fe(II)(DPPA)(NCS)(2)], where DPPA = (3-aminopropyl)bis(2-pyridylmethyl)amine is a new tetradentate ligand, have been synthesized, and their structures, magnetic properties, and Mössbauer spectra have been investigated. For polymorph A, variable-temperature magnetic susceptibilit…
As part of a general study of the structure of spider silk fibers, major ampullate gland silk fibers were collected from Nephila clavipes spiders, and SAXS patterns were obtained from loops of fibers under a variety of conditions. Two orders of lamellar reflection were seen, with a long spacing of 8.4 nm. This increas…
The crystallization behavior of a series of ethylene- b -(3-methyl-1-butene) diblocks (E/MB) is investigated via simultaneous, time-resolved small-angle and wide-angle X-ray scattering. All the diblocks contain 26−27 wt % E, but possess varying molecular weights and hence varying segregation strengths in the melt, ran…
Hybrid inorganic−organic polymer composites have been prepared by a convergent approach in which nearly monodisperse CdSe or (CdSe)ZnS nanoclusters are sequestered within phosphine-containing domains in a charge-transporting matrix. The motivation for these studies is the potential utility of such composites as combin…
Reactive ion etching (RIE) of synthetic Ib diamond and chemical vapor deposition (CVD) diamond films in O 2 and CF 4 has been investigated. The large etch rate of up to 2.8 µ m/h and etch rate ratios of 15–20 for diamond (100)/Al were obtained at CF 4 /O 2 =10–20%. Numerous columnar structures of approximately 300 nm…