Materials Literature
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A series of novel pyrrolopyrrole cyanines (PPCys) bearing various aminophenyl substituents at the diketopyrrolopyrrole (DPP) core are presented. Compared to their alkoxyphenyl substituted analogues, these dyes feature additional intense electronic transitions of charge-transfer character which give detailed insight in…
We study by simulation the physics of two colloidal particles in a cholesteric liquid crystal with tangential order parameter alignment at the particle surface. The effective force between the pair is attractive at short range and favors assembly of colloid dimers at specific orientations relative to the local directo…
We report here high-performance broadband membrane reflectors based on crystalline silicon nanomembrane photonic crystals. A modified polydimethylsiloxane stamp transfer technique is developed for transferring large-area silicon membranes to glass substrates. Polarization-independent broad reflectivity at 1550-nm wave…
Dispersionen von CdS-, ZnS-, PbS- oder MnS-Nanopartikeln sind direkt durch Mischen des festen Metallsulfids mit einer geeigneten ionischen Flüssigkeit erhältlich, ohne dass sonstige Additive oder Lösungsmittel zugesetzt werden müssen (siehe Schema). Die Auswahl der ionischen Flüssigkeit ist entscheidend für den Erfolg…
In macromolecular electronics the organic material should offer—besides the desired electronic properties—the possibility of lateral patterning. Here, we report on a novel polyaniline derivative bearing photosensitive N-formamide groups. UV illumination of this polymeric material leads to a decarbonylation reaction re…
Molecularly hybridized materials composed of polymer semiconductors (PSCs) and single-walled carbon nanotubes (SWNTs) may provide a new way to exploit an advantageous combination of semiconductors, which yields electrical properties that are not available in a single-component system. We demonstrate for the first time…
Novel wood cellulose-based polyelectrolyte complex nanoparticles were prepared by mixing negatively charged carboxymethyl cellulose (CMC) and positively charged quaternized cellulose (QC) in aqueous medium. As observed by transmission electron microscopy (TEM), the CMC–QC nanoparticles were approximately spherical and…
Synchrotron wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) were used to characterize the structure evolution of propylene–1-butylene (P–B) random copolymer subjected to uniaxial tensile deformation at 100 °C. Polymorphism and preferred orientation of the crystal phases were examined quanti…
Abstract St-37-type steel samples were pretreated with Cr(III) and Cr(VI) conversion coatings (CC). The Cr(III) pretreated samples were then posttreated by Co(II) and Ni(II) CC. The corrosion resis...
A series of π-conjugated polymers consisting of bis-EDOT or bis-EDTT units and p - or o -diphenylbenzodifuranones have been prepared electrochemically. The monomers and polymers were investigated using UV/vis absorption spectroscopy and cyclic voltammetry. The monomers were synthesized from 3,4-ethylenedioxythien-2-yl…
Composite nanoparticles have proved to be promising in a wide range of biotechnological applications. In this paper, we report on a facile method to synthesize novel Fe(3)O(4)/Au/Fe(3)O(4) nanoparticles (nanoflowers) that integrate hybrid components and surface types. We demonstrate that relative to conventional nanop…
Structural, photoluminescence, dielectric, and ferroelectric properties of lead‐free perovskite Pr 3+ ‐doped x K 0.5 Bi 0.5 TiO 3 –(1− x ) Na 0.5 Bi 0.5 TiO 3 ( x = 0–1.0) thin films were studied. The thin films were prepared by a chemical solution deposition method combined with a rapid thermal annealing process at 7…
The dehydration of crystals of macromolecules has long been known to have the potential to increase their diffraction quality. A number of methods exist to change the relative humidity that surrounds crystals, but for reproducible results, with complete characterization of the changes induced, a precise humidity-contr…
Silver nanoparticles are used in diverse applications due to their unique properties, and thus are rapidly becoming part of our daily life. Silver nano-based products like wound dressings, cosmetics and antimicrobial coatings are now available in the market. However, little is known about their biodistribution and tox…
Composite materials made of mesoporous oxide thin films containing metallic nanoparticles are of high interest in various fields, including catalysis, biosensing and non-linear optics. We demonstrate in this work the fabrication of such composite materials containing a sub-monolayer of gold nanoparticles (GNPs) of var…
Abstract Polyethylene (PE) samples were surface fluorinated by the F2/N2 mixture for 30, 60, 120 or 240 min to investigate the influence of the fluorinated layer characteristics on space charge accumulation. After polarization at 50 kV mm−1 dc electrical field and 40 °C for 240 min, the charge amounts of the samples f…
This article reports on the elastic, electronic and optical properties of predicted Ni-rich nitrides ANNi3 (A= Pt, Ag, Pd) in comparison with isostructural superconducting counterpart ZnNNi3. We have used first-principles density functional theory (DFT) with generalized gradient approximation (GGA). The independent el…
Highly fluorescent organic- and water-soluble CdSe/ZnS core-shell quantum dots (QDs) with thiol ligands chemisorbed on the QD surface were synthesized by the replacement of amine ligands by alkyl thiols under very mild conditions. The QDs exhibited an even greater photostability than the initial core-shell amine cappe…
Conducting polymers have shown great potential for application in electronic devices. A major challenge in such applications is to control the supramolecular structures these materials form to optimise the functionality. In this work we probe the structure of oligo(aniline) thin films (of sub-μm thickness) drop cast o…
The mesomorphic properties of small angle, bent-shaped molecules [N(1,7)-S-n] consisting of a 1,7-naphthalene central core, typical Schiff-base side wings, and alkylthio tails with the carbon number n have been investigated, and a notable formation of a cubic (Cub) phase in addition to a distinct hexagonal columnar (C…