Materials Literature
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Two-dimensional metal oxide sheets in HTiNbO(5) and HSr(2)Nb(3)O(10), cation-exchangeable layered metal oxides, were examined as solid acid catalysts. Exfoliation of HTiNbO(5) and HSr(2)Nb(3)O(10) in aqueous solutions formed colloidal single-crystal TiNbO(5)(-) and Sr(2)Nb(3)O(10)(-) nanosheets, which precipitated und…
Slow paramagnetic relaxation was observed at low temperatures from ac susceptibility measurements in the form of a frequency-dependent out-of-phase (χ) signal for the title complex (see picture). This provides compelling evidence that this cluster is a rare example of a cyanide-bridged single-molecule magnet.
The Ising on the cake: The cyanide-bridged low-spin FeIII–high-spin CoII compounds of formula [{FeL(CN)4}2Co(H2O)2]⋅4 H2O with L=2,2′-bipyridine (bpy; see picture; Ow=water O-atom) or 1,10-phenanthroline are 1D Ising systems and the first examples of ferromagnetically coupled bimetallic chains which show slow magnetic…
The kinetics of intermediate phase formation in (20 nm) Cu/(80 nm) Mg multilayers is analyzed using differential scanning calorimetry (DSC) and in situ x-ray diffraction. The as-prepared Mg layers are polycrystalline with large grain sizes and a columnar structure which gives a preferred orientation along the (0002) d…
Abstract An attempt was made on the modification of the tetraglycidyl‐4,4′‐diaminodiphenyl methane/diaminodiphenyl sulfone (TGDDM/DDS) system to improve properties for several industrial applications. Epoxy resins [TGDDM and 1‐glycidyloxy‐4‐methoxy phenol (GMP)] were synthesized in the laboratory. Also, a new cyanate…
The aim of this work is to show that ReflEXAFS can be used as a tool for investigating the initial stages of solid state reactions, when local chemical equilibrium is not yet attained at the interfaces. A very classical solid state reaction, i.e. the formation of Ni–Al spinel starting from the parent oxides (NiO + Al2…
Zn 2 Si 0.5 Ge 0.5 O 4 : Mn was investigated as a green-emitting oxide phosphor for thin-film electroluminescent (EL) display applications. Detailed electro-optical characteristics of thin-film EL devices with SrTiO3 dielectrics on a glass substrate (TFEL) and EL devices with a single ceramic insulator (CIEL) have bee…
Kinetic behaviors of unusual low-temperature ferroelectric properties of Pb0.97La0.02(Zr0.60Sn0.30Ti0.10)O3 ceramic were studied. In a wide temperature range it reveals the antiferroelectric properties with pronounced polarization versus electrical field hysteresis double loops resulting from the field-induced antifer…
The quadrupolar splittings of deuteriated para- and ortho-dichlorobenzene (1,4-DCB and 1,2-DCB, respectively) are measured by nuclear magnetic resonance (NMR) in the nematic solvents hexyl- and pentyloxy-substituted diphenyl diacetylene (DPDA-C6 and DPDA-OC5, respectively). Measurements are taken for all four combinat…
Much interest has been recently given to the development and understanding of ferromagnetic shape memory alloys. In particular, the interaction of crystallographic twin boundaries with an external magnetic field has been put forth as a mechanism for shape deformation and applied to the alloy Ni2MnGa. In this article,…
A continuing challenge in understanding the linkage of unsaturated molecules to produce novel networks has been the analysis of the reaction products. Here we report a UV Raman spectroscopic analysis of the amorphous C:H (a-C:H) network formed by compression of benzene. The network contains both sp 2 - and sp 3 -bonde…
The orientation behavior of liquid crystal networks having the Sm C A structure stabilized by H-bonds has been studied. The mesogenic groups formed by hydrogen bonds generate a layered structure of the polymer. The hydrogen bonds are responsible for the elastic properties of the liquid crystal polymer network and the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTInfrared Bands Sensitive to the Chain Packing Mode in the Crystalline δ, δe, and γ Forms of Syndiotactic PolystyreneAkiko Yoshioka and Kohji TashiroView Author Information Department of Macromolecular Science, Graduate School of Sci…
Electron-beam-stimulated deposition and etching has been investigated as a clean, alternative method for nanoscale selective processing. Depositions using W(CO)6 and hydrocarbon sources have yielded efficient and selective electron-beam deposits. Primarily fluorine-based precursors have been used to etch a variety of…
The dynamics of weld solidification were observed in situ using a laser welding process on transparent organic materials systems. Succinonitrile was used to simulate a pure metal system and succinonitrile with 1.2 wt. % acetone was used to simulate an alloy system. Observed weld pool shapes in succinonitrile were in g…
Metallic zinc nanowires are synthesized by evaporating ZnO powder mixed with graphite in an NH3 flowing carrying gas environment. The majority of the as-synthesized zinc nanowires are single crystalline and free from structural defects, whereas a small portion of the nanowires consists of single-crystalline Zn nanorod…
Neutron reflectivity was used to characterize the structure of end-grafted deuterated poly(dimethylsiloxane) ( d- PDMS) brushes on SiO x wafers exposed to liquid and supercritical carbon dioxide (CO 2 ). The solvent quality was tuned continuously over a large range from ideal gas conditions to a near-ϑ solvent by vary…
Unexpectedly high-longitudinal piezoelectric coefficients have recently been reported in c-axis oriented Pb(Zr,Ti)O3 thin films with morphotropic phase boundary composition [Fu et al., Appl. Phys. Lett. 80, 3572 (2002)]. Our analysis and experimental results show that, in comparison with other methods commonly used to…
From the water - methanol solution of Cu(II) - LN - [Ni(CN)4]2- (1:2:1) (LN = N, N-dimethylethylenediamine (dmen); N,N'-dimethylethylenediamine (bmen); N,N,N',N'-tetramethylethylenediamine (tmen) ) were isolated three new compounds: Cu(dmen)2Ni(CN)4 (CDNC), Cu(bmen)2Ni(CN)4 (CBNC) and Cu(tmen)Ni(CN)4 (CTNC). The resul…
Eight poly(aryl) ether dendritic wedges attached to the periphery of a phthalocyanine significantly decreases self-association of these chromophores in solution and the condensed state.