Materials Literature
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To characterize porous media, use is often made of the Lucas−Washburn equation, which relates the rate of capillary penetration of a given liquid to an effective cylindrical pore radius and the contact angle between the liquid and the medium. Here, we extend previous large-scale molecular dynamics simulations develope…
This letter describes the preparation, characterization, material properties, and biodegradability of polylactide (PLA)-layered silicate nanocomposite. Montmorillonite modified with trimethyl octadecylammonium cation was used as an organically modified layered silicate (OMLS) for the nanocomposite preparation. WAXD an…
The structural, electronic, and magnetic properties of ${\mathrm{Co}}_{2}\mathrm{Mn}X$ $(X=\mathrm{Si},$ Ge, Sn) Heusler compounds have been determined by means of all-electron full-potential linearized augmented plane wave (FLAPW) calculations. We focus on the effects on the electronic and magnetic properties induced…
The structure of poly(l-lysine) (PLL)/hyaluronan (HA) polyelectrolyte multilayers formed by electrostatic self-assembly is studied by using confocal laser scanning microscopy, quartz crystal microbalance, and optical waveguide lightmode spectroscopy. These films exhibit an exponential growth regime where the thickness…
Birds in a cage: The highly absorbent nitrogen-rich compounds SrN and SrN2 hide their secrets from Raman scattering experiments, but when observed using inelastic neutron scattering, the dinitrogen can be shown to lie trapped within a cage of strontium atoms. Such a structure is shown in the graphic for SrN2, in which…
The alpha relaxation process of the fragile glass former salol is investigated in the T-P domain by means of photon correlation spectroscopy. We find that a time-pressure superposition principle is obeyed for the relaxation function in addition to the time-temperature superposition. The behavior of the relaxation time…
Dendrite morphology and evolution during coarsening is examined by the authors using measurements of the three-dimensional microstructure. Such experiments are made possible by recent progress in serial-sectioning techniques. The dendrite-matrix interface is characterized by the local interfacial curvature, which in t…
Abstract Physical aging experiments after a deep quench were performed via an optical photobleaching technique to examine the evolution of the segmental dynamics of a polystyrene melt far below the glass transition temperature ( T g ). Both rotational and translational diffusion measurements of dilute tetracene probes…
Thermodynamisch stabil, aber kinetisch labil sind die M3L2-Käfigverbindungen im hier gezeigten [BF4⊂{Ag3(MsTBim)2}](BF4)2 1 und [{CuI3⊂[Cu3(MsTBim)2]}2][Cu2I4] 2, wobei 2 ein bisher noch nicht beschriebenes Metallkomplex-Wirt/Metallkomplex-Gast-Arrangement aufweist. Größere Anionen wie CF3SO3− oder BPh4− lagern sich a…
The question of localization in a one-dimensional tight-binding model with aperiodicity given by substitutions is discussed. Since the localization properties of the well-known Rudin-Shapiro chain is still far from well understood, partly due to the absence of rigorous analytical results, we introduce a sequence that…
We have investigated the photoinduced optical properties of a new class of chiral methacrylic polymers characterised by the presence in the side chain of an optically active pyrrolidinyl ring linked to a trans-azoaromatic system. The homopolymers are enantiomerically pure and their strong optical activity indicates th…
Highly soluble [(tBu(4)PcM)(2)O] phthalocyanine dimers (M=Ga(III) (3), In(III) (4)) were prepared by the reaction of [tBu(4)PcMCl] (M=Ga(III) (1), In(III) (2)) with excess of concentrated H(2)SO(4) at -20 degrees C. The Mbond;Obond;M linkages in 3 and 4 are not stable against concentrated H(2)SO(4) at room temperature…
An effective method for incorporating cadmium ions into mesoporous silica SBA-15 is demonstrated. One of the novel features is the assembly of CdS nanoparticles inside the mesopores by selectively functionalizing the external surface of SBA-15 in order to avoid the possible adsorption of the cadmium ions onto this sur…
A series of homodinuclear platinum(II) complexes containing bridging chalcogenido ligands, [Pt(2)(mu-E)(2)(P empty set N)(4)] (P empty set N=dppy, E=S (1), Se (2); P empty set N=tBu-dppy, E=S (3)) (dppy=2-(diphenylphosphino)pyridine, tBu-dppy=4-tert-butyl-2-(diphenylphosphino)pyridine) have been synthesized and charac…
The preparation of a new beta-tetrasubstituted porphyrin through a short synthesis with liquid crystalline properties in a wide range of temperatures including room temperature is described.
Polymer electrodes for batteries is one possible application of hybrid polymer films synthesized from pyrrole and polyoxometalates (shown in the graphic). These materials have high specific charges, between 30 and 80 mA h g−1, and the dc conductivities at room temperature are between 20 and 220 S cm−1. The synthesis,…
The efficiency of producing biological damage varies with radiation quality. Conventional explanations rely on spatial differences in the radiation track structure; generally however there are also very large temporal differences in delivery of the radiation at the cellular level. High-LET radiation normally deposits…
ABSTRACT A (high strain) low‐cycle fatigue (LCF) life prediction model of ultrafine‐grained (UFG) metals has been proposed. The microstructure of a UFG metal is treated as a two‐phase ‘composite’ consisting of the ‘soft’ matrix (all the grain interiors) and the ‘hard’ reinforcement (all the grain boundaries). The disl…
Bio-inspired optical systems have the potential to transform the process of image collection and analysis in the future. Through simplicity and dynamics these collection systems may provide multiple functions with an excellent level of reliability. From the graded index of the fish-eye to the hyper-acuity of the compo…
The magnetic and electronic properties of the perovskite system $({\mathrm{La}}_{0.7\ensuremath{-}x}{\mathrm{Gd}}_{x}){\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}$ $(0<~x<~0.6)$ have been investigated by measurements of magnetization, resistivity and magnetoresistance. The substitution of Gd on La sites not only result…