Materials Literature
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Polymorph discrimination of CaCO 3 mineral has been easily realized in an ethanol/water mixed solution system under mild conditions without using any organic additives. The phase transition from a mixture of calcite and aragonite to pure aragonite, and then to almost pure vaterite, can be nicely captured by the choice…
New oxides, BiAlO 3 and BiGaO 3, were prepared using a high-pressure high-temperature technique at 6 GPa and 1273−1473 K. BiAlO 3 is isotypic with multiferroic perovskite-like BiFeO 3 and has octahedrally coordinated Al 3+ ions. Structure parameters of BiAlO 3 were refined from laboratory X-ray powder diffraction data…
This article describes the studies of a photomagnetic cyanide-bridged Cu-Mo bimetallic assembly, Cu(II)(2)[Mo(IV)(CN)(8)].8H(2)O (Cu(II), S = (1)/(2); Mo(IV), S = 0) (1), which has an intervalence transfer (IT) band from Mo(IV)-CN-Cu(II) to Mo(V)-CN-Cu(I) around 480 nm. Wide-angle X-ray scattering and X-ray spectrosco…
Hydrogen-bonded multilayer thin films were constructed using poly(vinylpyrrolidone) and poly(methacrylic acid) functionalized with cysteamine. The resulting films included thiol moieties that were cross-linked to render the films stable at physiological pH. Film buildup was followed using quartz crystal microgravimetr…
Phase transformation of TiO2 from anatase to rutile is studied by UV Raman spectroscopy excited by 325 and 244 nm lasers, visible Raman spectroscopy excited by 532 nm laser, X-ray diffraction (XRD), and transmission electron microscopy (TEM). UV Raman spectroscopy is found to be more sensitive to the surface region of…
A combination of transmission electron microscopy (TEM) and in situ tensile testing in an environmental scanning electron microscopy (ESEM) was used to evaluate the static bulk and dynamic surface morphologies of medical polyurethanes. TEM results showed phase-separated hard segment and soft segment structures. Surfac…
Kapitel 46, 18 S.
We present a generalization of the Green-Kubo expressions for thermal transport coefficients $\ensuremath{\mu}$ in complex fluids of the generic form $\ensuremath{\mu}={\ensuremath{\mu}}_{\ensuremath{\infty}}+{\ensuremath{\int}}_{0}^{\ensuremath{\infty}}dt{V}^{\ensuremath{-}1}{⟨{J}_{ϵ}\phantom{\rule{0.2em}{0ex}}\mathr…
A phenomenological model based on the interactions between the crystal field and the 3d–4f exchange interactions has been developed to explain the zero-kelvin magnetic anisotropy of the RFe 11 Ti compounds and their hydrides, RFe 11 TiH, where R is a rare-earth element. In most cases, this model also predicts the exis…
The crystalline structure of biodegradable poly(3-hydroxypropionate) (PHP) has been found to quite depend on the molecular weight (MW) and crystallization conditions. In particular, a new crystal form (the δ-form) has been successfully prepared by casting and optimal melt-crystallizing the low-MW PHP. The overwhelming…
Polyadipates might be a suitable replacement for conventional plasticizers in plastisols to produce lids for glass jars complying with legal limits for oily foods. For the characterization of polyadipates, the proportion of the material with a molecular mass below 1000 Da is important. Determination of the material <…
A fixed-bed reactor has been designed and constructed for ex situ transmission electron microscopy (TEM) studies of heterogeneous catalysts. The ex situ facility exposes a fully prepared TEM sample on a grid to actual process conditions (e.g., temperature, pressure, gas composition, etc.) by placing the grid at the ex…
Carbon-13 NMR spectroscopy is used to probe the orientational ordering in the tilted chiral smectic phase of two partially deuterated liquid crystals. Quantitative analyses of the chemical shifts of the aromatic carbons in the smectic- and - phases enable us to obtain the location of the long molecular axis of the cor…
Abstract Three Alkali‐Metal Erbium Thiophosphates: From the Layered Structure of KEr[P 2 S 7 ] to the Three‐Dimensional Cross‐Linkage in NaEr[P 2 S 6 ] and Cs 3 Er 5 [PS 4 ] 6 The three alkali‐metal erbium thiophosphates NaEr[P 2 S 6 ], KEr[P 2 S 7 ], and Cs 3 Er 5 [PS 4 ] show a small selection of the broad variety o…
Abstract Two novel As‐V‐O cluster supported transition metal complexes, [Zn(en) 2 ][Zn(en) 2 (H 2 O) 2 ][{Zn(en)(enMe)}As 6 V 15 O 42 (H 2 O)]·4H 2 O ( 1 ) and [Zn 2 (enMe) 2 (en) 3 ][{Zn(enMe) 2 }As 6 V 15 O 42 (H 2 O)]·4H 2 O ( 2 ), have been hydrothermally synthesized. The single X‐ray diffraction studies reveal th…
The structure of the recently discovered systematically reproducible Mo 6 S y I z nanowires has been determined from the atomic pair distribution function (PDF) analysis of powder X-ray diffraction data. This total scattering approach was required because the nanowires are not perfectly crystalline and, therefore, the…
We propose a complete set of periodic circuit networks which can realize electromagnetic wave propagation in different two-dimensional (2D) isotropic and anisotropic metamaterials (AMMs). We synthesize the periodic circuits with unit cells of series capacitor or inductor in orthogonal directions, together with either…
We have prepared a hybrid inorganic/organic, anhydrous proton-conducting polymer electrolyte (MePEG 3 SiO 3 ) n . Structural characterization of this MePEG 3 polymer through 29 Si NMR spectroscopy and gel-permeation chromatography indicates that our MePEG 3 polymer is composed of several different structures giving a…
Abstract Sm 2 As 4 O 9 : An Unusual Samarium(III) Oxoarsenate(III) According to Sm 4 [As 2 O 5 ] 2 [As 4 O 8 ] Pale yellow single crystals of the new samarium(III) oxoarsenate(III) with the composition Sm 4 As 8 O 18 were obtained by a typical solid‐state reaction between Sm 2 O 3 and As 2 O 3 using CsCl and SmCl 3 as…
Effects of codoping of phosphorus and/or boron on the coordination sphere of a ${\mathrm{Ce}}^{3+}$ in ${\mathrm{SiO}}_{2}$ glasses were examined by applying pulsed electron paramagnetic resonance (EPR) electron spin echo envelope modulation (ESEEM) spectroscopy. Simulation of the observed ESEEM pattern revealed a str…