Materials Literature
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Eine neue Klasse periodischer mesoporöser Organosiliciumoxide (PMO) mit π-Stapelanordnung der organischen Gruppen im Gerüst wurde unter Verwendung scheibenförmiger Vorstufen mit hydrophobem Perylenbisimid(PBI)-Kern aufgebaut (siehe Bild). Die PBI-verbrückten PMOs verfügen über Excitonenkopplung und bilden bei der Doti…
Highly loaded Al(OH) 3 slurries were prepared in a 2 vol% aqueous acetic acid medium up to 33.3 wt% powder loading. The slurries were blended with 4 wt% chitosan in 2 vol% acetic acid and formed into ceramic fibers through wet spinning in sodium tripolyphosphate ( STPP ) bath. A gelation kinetics study of the chitosan…
Abstract Well defined highly monodispersed single crystalline ZnO hexagonal thin nanodisks have been synthesized by a wet chemical route. Ethylenediaminetetraacetic acid is used as an organic ligand in the chemical synthesis. Ultraviolet near band edge emission is predominant over the defect level emission in these Zn…
1,3-Phenylene-bridged perylenebisimide dimer (PBI2) and trimer (PBI3) were prepared along with monomer reference (PBI1) using perylene imide-anhydride 5 as a key precursor. 3,3-Dimethylbut-1-yl substituents were introduced at the 2,5-positions of perylenebisimide (PBI) to improve the solubilities of PBI oligomers. Act…
The effects of single-walled carbon nanotubes (SWCNTs) as a co-catalyst with NbF5 on the dehydrogenation and hydrogenation kinetics of NaAlH4 were investigated by X-ray diffraction, Fourier transform infrared spectroscopy, differential thermal analysis, temperature-programmed desorption, and isothermal hydrogen ab/des…
Our recent experimental study on electrospinning of block copolymer (BCP)–nanoparticle (NP) nanocomposites has revealed the formation of unique self-assembling structures in submicron scale fibers. In this paper, we use coarse-grained molecular dynamics (MD) simulations to investigate the effect of cylindrical confine…
The synthesis and characterisation of seven iron(II) 1D chain coordination polymers with tetradentate Schiff-base like equatorial ligands and bis(4-pyridylmethyl)sulfide (bpms) as a flexible bridging axial ligand is reported. This new family of materials displays a wide spectrum of spin transition properties in the so…
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…