Materials Literature
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Abstract A synthetic pathway to functionalized six‐membered dilactones structurally analogous to lactide is described. Through the use of orthogonal protecting groups, the synthesis of functionalized dilactones was performed in a straightforward way by cyanuric chloride‐mediated cyclization of the corresponding linear…
The current picture: Electrochromic and uniform films of different conducting polymers on mirror-polished platinum electrodes were electrochemically reduced and compacted to show the formation and growth of colored nuclei under potentiostatic oxidation (see photographs of films). By interruption of the nucleus growth,…
The propagation and refraction of a cylindrical wave created by a line current through a slab of backward-wave medium, also called left-handed medium, is numerically studied with a finite-difference time-domain method. The slab is assumed to be uniaxially anisotropic. Several sets of constitutive parameters are consid…
It has recently been found that Pluronics (block copolymers of ethylene oxide, EO, and propylene oxide, PO) favor the permeability and accumulation of anthracycline antibiotics, for example doxorubicin (Dox), in tumor cells. In an effort to understand these results, the interaction of EO(2)/PO(32)/EO(2) (Pluronic L61)…
The electrical stability of a novel polypyrrole (PPy)/poly(D,L-lactide) (PDLLA) composite was studied in vitro and compared with that of PPy-coated polyester fabrics. Specimens were incubated in Ringer's solution at 37 degrees C for up to 8 weeks with or without the circulation of DC current under a constant 100 mV vo…
It's all in the casting: The pore sizes of nano-structured light-emitting films cast from linear and star-shaped macromolecular architectures can be engineered from the nano- to microrange by simply manipulating the casting conditions. The confocal microscopy image shows highly fluorescent organized porous materials w…
A full-profile refinement of the layered antiferromagnetic ${\mathrm{FeI}}_{2}$ crystallographic structures at pressures up to 70 GPa were performed combined with ab initio calculations to particularly elucidate the structural aspects of the recently observed pressure-induced quenching of the orbital term of the ${\ma…
A novel colloidal system composed of two kinds of inorganic oxide nanosheets dispersed in water was prepared by mixing exfoliated layered niobate K 4 Nb 6 O 17 and montmorillonite clay. According to the observation of the colloids under crossed polarizers, the obtained niobate−clay colloids were liquid crystalline wit…
The synthesis and characterization of phenylethynyl (PE) end-capped polyimides derived from 4,4‘-(2,2,2-trifluoro-1-phenylethylidene) diphthalic anhydride (3FDA), 4,4‘-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), and 3,3‘,4,4‘-biphenylene dianhydride (s-BPDA) are described in this paper, with particular emp…
A cyanide-bridged molecular square of [Ru(II) (2)Fe(II) (2)(mu-CN)(4)(bpy)(8)](PF(6))(4).CHCl(3).H(2)O, abbreviated as [Ru(II) (2)Fe(II) (2)](PF(6))(4), has been synthesised and electrochemically generated mixed-valence states have been studied by spectroelectrochemical methods. The complex cation of [Ru(II) (2)Fe(II)…
Abstract Poröse Materialien und Materialien mit großer Oberfläche sind in vielen wissenschaftlichen Bereichen von Interesse. Templatverfahren können genutzt werden, um solche Materialien unter Steuerung ihrer Struktur‐ und Textureigenschaften zu synthetisieren, wobei molekulare oder supramolekulare Einheiten als Templ…
A novel organic-inorganic hybrid thermotropic liquid crystal (LC) is developed by the hybridization of an organic amine with a mesogenic core and an acicular anisotropic TiO2 particle through the adsorption of the amino group to the surfaces of the TiO2. The hybrid LC shows nematic phases in wide ranges of temperature…
Manganese oxide species (MnO(x)) have been intercalated within the gallery spaces of Mg-Al layered double hydroxides (LDHs). Synthesis of these materials was achieved by ion-exchange of the LDH-nitrate precursor with permanganate anion followed by reduction with organic reagents, such as glucose, ethanol, and ascorbic…
Gradient surfaces are widely employed in biological studies for protein adsorption and cell attachment and growth. They also offer great potential in the areas of fluid flow and combinatorial experimental design for obtaining material properties and behaviors. Gradient surfaces are created with organosilanes by using…
A novel asymmetric monosubstituted 1,10-phenanthroline, Hophen.0.5 H(2)O (1, Hophen=1H-[1,10]phenanthrolin-2-one), was generated by a facile route, and a novel class of crystalline, d(10)-metal, monomeric or oligomeric complexes of this ligand, namely [Hg(ophen)(2)].4 H(2)O.CH(2)Cl(2) (2), [Cd(3)Cl(ophen)(5)].1.5 H(2)…
Abstract Although tetrathiafulvalene and its derivatives have been extensively studied as π‐electron donors in the fields of molecular organic metals and electrically conducting materials for more than 30 years, the intriguing potential of tetrathiafulvalene as a building block in molecular and supramolecular chemistr…
Preface 1. ELECTROMAGNETIC FIELDS 2. Green's functions and retarded potentials 3. Time-harmonic fields 4. Models of materials with memory 5. THERMODYNAMICS OF SIMPLE ELECTROMAGNETIC SYSTEMS 6. Thermoelectromagnetic systems 7. Existence and uniqueness 8. Wave propagation 9. Extremum principles 10. PROBLEMS IN NONLINEAR…
Highly ordered mesoporous silica materials are hydrothermally synthesized at high temperature by using fluorocarbon–hydrocarbon surfactant mixtures as templates. Because of the high temperature of the synthesis, the obtained materials show complete silica condensation, which give rise to ultra-stabile structures. JLU-…
The E. coli nitroreductase enzyme (NTR) has been widely used in suicide gene therapy (GDEPT and ADEPT) applications as a activating enzyme for nitroaromatic prodrugs of the dinitrobenzamide class. NTR has been previously shown to be a homodimeric enzyme with two active sites. We present here the crystal structures of…
Hoch geordnete, mesoporöse SiO2-Strukturen wurden durch Hydrothermalsynthese mit Fluoralkan/Alkan-Tensid-Mischungen als Templaten erhalten. Aufgrund der hohen Reaktionstemperatur ist die Silicatkondensation vollständig, und die Produkte sind besonders stabil. JLU-20 z. B. (siehe TEM-Bild einer calcinierten Probe) hat…