Materials Literature
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Newtonian viscosities of 19 multicomponent natural and synthetic silicate liquids, with variable contents of SiO 2 (41–79 wt%), Al 2 O 3 (10–19 wt%), TiO 2 (0–3 wt%), FeO tot (0–11 wt%); alkali oxides (5–17 wt%), alkaline-earth oxides (0–35 wt%), and minor oxides, obtained at ambient pressure using the high-temperatur…
Superconducting ${\mathrm{LaGe}}_{5}$ was synthesized by the reaction of La and Ge mixtures under a pressure of 5 GPa at 1200 \ifmmode^\circ\else\textdegree\fi{}C. It crystallized in the orthorhombic space group Immm (No. 71) with $a=4.0290(6),$ $b=6.307(1),$ and $c=9.978(2)\AA{},$ $V=253.54(6){\AA{}}^{3},$ and $Z=2.$…
Gold nanoparticles have been precipitated in the presence of a stiff polyphenylene dendrimer template with 16 thiomethyl groups on the outside. Powder X-ray diffraction analysis shows an average particle size of ∼3.7 nm; surprisingly, transmission electron microscopy (TEM) reveals a bimodal particle size distribution.…
Durch chemisches „Entkernen“ eines dendritischen Metalloporphyrin-Koordinationspolymers können organische Nanoröhren erzeugt werden (siehe schematische Formel). Zuvor wird die Peripherie des Oligomers durch Ringschlussmetathese intramolekular vernetzt.
The two-dimensional coordination polymer spin-crossover compound Fe(pyridine)2[Ni(CN)4] (1) and its isotope substituted analogues Fe(pyridine-D5)2[Ni(CN)4] (2) and Fe(pyridine-15N)2[Ni(CN)4] (3) have been synthesised and the isotope effect on the thermal spin-crossover behaviour has been studied using magnetic suscept…
We investigate the slow dynamics of strongly aggregated particle gels by diffusing wave spectroscopy (DWS) using a charge coupled device (CCD) camera as a multispeckle detector. The evolution of the slow dynamics after the gel-point is followed using two different techniques, the multispeckle method and a novel correl…
As a fundamental building block of a conductive magnetic macromolecule, a series of pyrrole derivatives carrying a nitronyl nitroxide (NN) group was prepared. Some of these derivatives afforded ground-state triplet diradical cations upon one-electron oxidation, and the difference in the spin multiplicities of the sing…
Degrading films: Surface-component-dependent and time-controlled degradation of a layer-by-layer (LbL) assembly comprising DNA and a cationic synthetic polymer is demonstrated through enzymatic hydrolysis by DNase I (see picture). The negatively charged enzyme is preserved on the cationic polymer surface in an inactiv…
Abstract Chelating agents are materials that are used to control undesirable reactions of metal ions. In oilfield chemical treatments, chelating agents are frequently added to stimulation acids to prevent precipitation of solids as the acid spends on the formation being treated. These precipitates include iron hydroxi…
We study the influence of the system size on various static and dynamic properties of a supercooled binary Lennard-Jones liquid via computer simulations. In this way, we demonstrate that the treatment of systems as small as N = 65 particles yields results relevant for the understanding of bulk properties. In particula…
Incorporating films: An ultrathin polymer film that is molecularly porous and conformationally regular is prepared by the selective solvent extraction of one component from a layer-by-layer stereocomplex assembly. The resulting host film can reincorporate the extracted polymer (see picture; PMMA: poly(methyl methacryl…
In variable-range-hopping theories for the dc conductivity, the extension of sites where the charges are located and the energy dependence of the density of states (DOS) are usually neglected. We show that these dependences are the dominant factors for understanding the strong doping dependence, and present an analyti…
In this communication we present the facile preparation and characterisation of thermotropic liquid-crystalline materials from the ionic self-assembly of a charged perylenediimide derivative and oppositely charged surfactants.
Carbon hollow spheres (400-600 nm) and vessels (400 nm x 3000 nm) have been synthesized from sp3-CCl4 at 190 and 230 degrees C, respectively. The HRTEM images and Raman spectra reveal the sp2 nature of the as-obtained products, indicating that the transformation from carbon sp3 to sp2 occurs in the reactions. The poss…
Silicones have become established in a wide variety of applications ranging from electronics to personal care products. It has been estimated recently that there are approximately 3000 commercial silicone products. These are made up from silicone fluids, elastomers and resins. Many hybrid materials also exist whereby…
The solvothermal reaction of elemental zinc with sulfur in ethylenediamine (en) as solvent yields [ZnS-0.5(NH2CH2CH2NH2)], 1, an unprecedented ethylenediamine pillared ZnS layered compound, containing two dimensional (2-D) boat-type 6-membered rings, which was characterized by ab initio structure solution from powder…
Fabrication and evaluation of a subwavelength grating in diamond, designed to reduce the Fresnel reflection, is demonstrated. The antireflection (AR) structures are designed to reduce the surface reflection at an illuminating wavelength of 10.6 microm. With this AR-treatment, where no other material is introduced (i.e…
Atomic detailed structural study of a transiently existing folding intermediate is severely limited because of its short life. In ubiquitin, we found that a pressure-stabilized equilibrium conformer shares a common structural feature with the proline-trapped kinetic intermediate found in a pulse-labeling (1)H(2)H exch…
By means of suitable reduction and oxidation reactions, [VVO7(OCH3)12] (see picture) can be converted into three further representatives of this cluster with varying VIV/VV ratios ([VVO7(OCH3)12](4−n) with n=3, 5, 6), even in the cationic form which is unusual for the classic polyoxometalate-forming metals V, Nb, Ta,…
We describe a combination of laboratory and simulation studies that give quantitative information on the energy landscape for glass-forming liquids. Both types of study focus on the idea of suddenly extracting the thermal energy, so that the system obtained for subsequent study has the structure, and hence potential e…