Materials Literature
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The performance of flavylium-based photochromic systems is increased by their incorporation into Pluronic F-127 matrixes, which switch from polymeric solutions to micelles to gels with changes in temperature depending on copolymer concentration. Two flavylium compounds, 7,4'-dihydroxyflavylium and 7-(N,N-diethylamino)…
Abstract Poly(2‐(dimethylamino)ethyl methacrylate)‐ b ‐poly(γ‐methacryloxypropyl‐trimethoxysilane) (PDMA‐ b ‐PMPS) was synthesized via consecutive reversible addition‐fragmentation chain transfer (RAFT) polymerizations in 1,4‐dioxane. Subsequent micellization of the obtained amphiphilic diblock polymer in aqueous solu…
Metallionen-Matrjoschka: Ein 108-kerniger Heterometallcluster mit außergewöhnlicher konzentrischer Vier-Schalen-Struktur (siehe Bild) und antiferromagnetischer Kopplung wird beschrieben.
Abstract Atomically flat films of poly(hydroxymethyl)siloxane (PHMS) were modified at surfaces by oxygen‐plasma treatments and characterized by several surface sensitive techniques. The purpose was to develop well‐characterized films with SiO x surface properties for various applications. The unmodified and plasma‐tre…
The reactions of [Mn3O(O2CCCl3)6(H2O)3] with 1-phenyl-3-(2-pyridyl)propane-1,3-dione (HL(1)) and 1-(2-pyridly)-3-(p-tolyl)propane-1,3-dione (HL(2)) in CH2Cl2 afford the mixed-valence Mn(II)2Mn(III)2 tetranuclear complexes [Mn4O(O2CCCl3)6(L(1))2] (1) and [Mn4O(O2CCCl3)6L2(2)] (2), respectively. Similar reactions employ…
A simple experimental model system based on the reaction between silver(I) and a hydroquinone has been used to investigate the synthesis of silver nanoparticles (NPs) in aqueous media. Progressive nucleation and autocatalytic surface growth were found to be the relevant processes that control the morphology. The effec…
An organo-soluble, peptide-polymer conjugate that combines poly(n-butyl acrylate) with a beta-sheet-forming peptide is spread at the water surface to investigate peptide-guided self-assembly in a two-dimensional environment. Single layers of the conjugate are studied to gain information on the packing, orientation, an…
Dendritic cobalamin ligands: The first dendritic ligands for vitamin B12 were identified from a combinatorial library of peptide dendrimers that feature metal-coordinating residues at the core. Molecular recognition and discrimination among different amino acid sequences revealed dendrimers with a polyanionic shell of…
We report an analytical method which allows the systematic variation of color states of pairs of electrochromic conjugated conducting polymers with simultaneous spectroelectrochemical and colorimetric characterization of the resulting color summation. This method measures colors by transmitting light through two polym…
The present work focuses on the electrical and mechanical characterization of nanocomposite fibers having core−sheath (or bicomponent) morphologies. Owing to their unique mechanical and electrical properties, multiwalled carbon nanotubes (MWNTs) have been utilized in the nanocomposite construction. Submicron diameter…
A coarse-grained lattice gas model is developed to study the drying-mediated self-assembly of nanoparticles on diblock copolymer substrates. The model describes the nanoparticles, the solvent and the diblock copolymer on length scales that are typical to the solvent bulk correlation length. Monte Carlo simulation tech…
Zwei Arylimidoderivate von Hexamolybdat mit bislang unbekannten Imido-Brückenliganden wurden synthetisiert und strukturanalytisch charakterisiert. Die Verbindungen unterscheiden sich in den 1H-NMR- und UV/Vis-Spektren von Derivaten mit endständigen Liganden und könnten Einblicke in den Mechanismus der Oxometathese bei…
The compound (n-Bu4N)2Tc2Br8 was prepared by the metathesis of (n-Bu4N)2Tc2Cl8 with HBr (g) in dichloromethane and characterized by X-ray absorption fine structure spectroscopy and UV-vis spectroscopy. Analysis of the data gives a Tc-Tc distance of 2.16(1) A and a Tc-Br distance of 2.48(1) A. The Tc(III) oxidation sta…
The luminescence properties of Er doped β-Ga 2 O 3 and of the erbium gallium garnet Er 3 Ga 5 O 12 (ErGG) have been investigated both in the visible and in the infrared (IR) ranges by means of photoluminescence (PL). Doping of the β-Ga 2 O 3 was obtained in two different ways: erbium ion implantation into β-Ga 2 O 3 a…
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This paper reports a hydrothermal conversion process of a rare earth nanostructure, Gd(OH) 3 nanorods, into photoluminescent GdVO 4 nanorods, together with the investigation on the morphological changes and related photoluminescent properties. Gd(OH) 3 precursor with nanorod shape, uniform diameter, and good crystalli…
Chitosan-gold hybrid nanospheres were prepared through a direct facile approach that utilized cross-linked composite nanospheres consisting of low-molecular-weight chitosan (LWCS) and ethylenediaminetetraacetic acid (EDTA) as a precursor reaction system. EDTA was employed not only to construct the counterion interacti…
We have covalently attached multiple photoluminescent silicon nanoparticles (SNs) to streptavidin molecules. Conjugation of SNs to a target protein is achieved using the multistage photoassisted procedure. In a first step, the terminal hydrogen in the freshly prepared SNs is substituted with an alkane monolayer that s…
CaCO 3 superstructures with complex forms and hierarchical surface textures were mineralized in the presence of peptide type block copolymer poly(ethylene glycol)- b -poly( l -glutamic acid) (PEG- b -pGlu) as a crystal growth modifier in dimethyl formamide (DMF) solution. Spindle-like CaCO 3 crystals with a rather smo…
The ins and outs of it: The external and internal surfaces of mesoporous materials can be modified independently by exploiting the wetting behavior of the pores modified with a hydrophobic activated monolayer. To demonstrate the principle, porous silicon photonic crystals were modified with ligands promoting cell adhe…