Materials Literature
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Abstract Summary: The paper reviews recent developments in synthesis and characterization of regioselectively functionalized cellulose derivatives. It demonstrates the importance of protecting groups like triphenylmethyl‐ and thexyldimethylsilyl (TDMS) ethers in cellulose chemistry. The protected cellulose derivatives…
The electrical transport properties of boron doped graphitelike amorphous carbon films have been studied. Variable range hopping (VRH) conduction is found to be the conduction mechanism in these carbon films. The conduction in high temperature regime follows the Mott VRH [J. Non-Cryst. Solids 1, 1 (1968)], whereas a c…
The intermetallic compound Zr1-xTixCo was prepared and its suitability for hydrogen storage was investigated. The alloys obtained by magnetic levitation melting with the composition of Zr1-xTixCo (x =0, 0.1, 0.2 and 0.3, at. %) show single cubic phase by X-ray diffraction. A single sloping plateau was observed on each…
Abstract Because of environmental concerns, the zinc content in rubber compounds has come under scrutiny. The research described in this article encompasses zinc‐oxide, various zinc‐complexes and alternative metal oxides as activators for sulphur vulcanisation. Regarding zinc complexes, it can be concluded that zinc‐…
Experimental sorption and dilation data of the polysulfone/CO 2 system at 308 K and pressures up to 50 bar were measured utilizing a gravimetric sorption balance and a dilatometer based on a capacitive distance sensor. The data of this glassy polymer/gas system were subjected to a thorough kinetic analysis on the basi…
The photophysical properties of a series of 3,4-ethylenedioxythiophene oligomers (OEDOT) with up to five repeat units are studied as function of conjugation length using absorption, fluorescence, phosphorescence, and triplet-triplet absorption spectroscopy at low temperature in a rigid matrix. At 80 K, a remarkably hi…
Generation of surface-tethered block copolymer brushes with well-defined physicochemical characteristics requires achieving good control over the degree of polymerization of each block of the copolymer. In order to precisely form these block copolymer layers, one must (1) utilize a polymerization scheme that is capabl…
Colloidal nanocrystal heterostructures in which two or more chemically distinct inorganic components are epitaxially fused together provide new opportunities in developing multifunctional building block materials. The ability to synthesize structurally and chemically well-defined nanocrystal heterostructures can provi…
Recent literature data about the preparation and the functional properties of two-phase ceramic composites comprising of a ferroelectric perovskite and a magnetic ferrite are presented and critically compared, together with new results found in BaTiO3–(Ni,Zn)Fe2O4 composites. The phase assemblage and the spontaneous s…
Poly(ethylene glycol) (PEG) is widely used in the pharmaceutical, biotechnology, and medical device industries. Although PEG is a biocompatible polymer that has enjoyed widespread use in drug delivery technology, it is not considered adhesive toward mucosal tissue. Here the authors describe a simple approach to enhanc…
We have conducted a careful study of current-voltage (I-V) characteristics in fully integrated commercial PbZr0.4Ti0.6O3 thin-film capacitors with Pt bottom and Ir∕IrO2 top electrodes. Highly reproducible steady-state I-V were obtained at various temperatures over two decades in voltage from current-time data and anal…
In this paper, we investigate the mechanisms of absorbing defect generation by pulsed X-rays (~1 MeV), gamma-rays (~1.2 MeV) and 14-MeV neutrons in silica-based optical fibers. We measure the spectral and temporal dependence of the radiation-induced attenuation (RIA) from the ultraviolet to the near-infrared part of t…
Abstract The higher order structure of stereocomplex‐type poly(lactic acid) melt‐spun fibers of an equimolar blend of poly( L ‐lactic acid) and poly( D ‐lactic acid) was analyzed with wide‐angle X‐ray diffraction (WAXD) and birefringence measurements. Two different crystalline structures were observed in the fibers: α…
Abstract The thermoplastics processing of native starch in the presence of water is a recent development with very wide possible applications. Eventually, oil‐based polymer materials have to be replaced in many applications by sustainable, inexpensive, natural materials from renewable resources. The present contributi…
A shape memory composite (SMC) belt with a TiNi-shape memory alloy (SMA) wire fiber and a polyurethane-shape memory polymer (SMP) sheet matrix is fabricated. The bending actuation characteristics of the belt are investigated by the thermomechanical tests. The results obtained are summarized as follows. (1) Residual de…
An unanticipated superparamagnetic response has been observed in cobalt ferrite materials after thermal treatment under inert atmosphere. Cobalt ferrite particles were prepared via normal micelle precipitation that typically yields CoxFe3−xO4 nanoparticles (x=0.6−1.0). While samples thermally treated under oxygen show…
The use of a multiple attachment sites strategy is considered in order to improve the stability of monomolecular adlayers. The hypothesis was tested in the case of PEG-ylated compounds carrying phosphonate groups, known for their affinity toward titanium oxide surfaces. As a result, a new class of co- and terpolymers…
Data on luminescent complexes with azomethine ligands are generalized and systematized. The synthesis and luminescent properties of complexes with acyclic and cyclic azomethines are considered.
Quantum dots (QDs) have been applied to a wide range of biological studies by taking advantage of their fluorescence properties. There is almost no method to trace small molecules including medicine. Here, we used QDs for fluorescent tracers for medicine and analyzed their kinetics and dynamics. We conjugated QDs with…
This article reviews recent developments of using nanometer-sized particular matrices for supporting catalysts and catalytic organic reactions. Immobilization of a catalyst onto the surface of an Au or magnetic (e.g. Fe2O3) nanoparticle allowed facile separation and recycling of the catalyst out of the reaction mixtur…