Materials Literature
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The Hofstadter butterfly spectral patterns of lattice electrons in an external magnetic field yield some of the most beguiling images in physics. Here we explore the magnetoelectronic spectra of systems with moir\'e spatial patterns, concentrating on the case of twisted bilayer graphene. Because long-period spatial pa…
A unique method for quantitative in situ nanotensile testing in a transmission electron microscope employing focused ion beam fabricated specimens was developed. Experiments were performed on copper samples with minimum dimensions in the 100-200 nm regime oriented for either single slip or multiple slip, respectively.…
Bunte Bilder: Rotorangefarbene, gelbe und grüne Photolumineszenz wird von einer einzigen flüssigkristallinen Mischung erzeugt, die einen Luminophor enthält (siehe Bild). Die mit bloßem Auge unterscheidbaren Farben können reversibel gemalt und wieder gelöscht werden. Überdies lassen sich die Lumineszenzfarben durch mec…
A glowing image: The photoluminescent colors reddish-orange, yellow, and green, are generated from a single liquid-crystalline mixture containing one luminophore (see picture). The colors are easily distinguished by the naked eye and can be reversibly written and erased. Moreover, these luminescent colors can be switc…
Organic electrochemical transistors are integrated in flexible microfluidic systems. A novel label-free DNA sensor is developed based on the devices with single-stranded DNA probes immobilized on gate electrodes. These devices successfully detect complementary DNA targets at low concentrations using a pulse-enhanced h…
This article presents a computational constitutive model for glass subjected to large strains, high strain rates and high pressures. The model has similarities to a previously developed model for brittle materials by Johnson, Holmquist and Beissel (JHB model), but there are significant differences. This new glass mode…
Graphene hydrogels prepared via hydrothermal reduction of graphene oxide dispersions (GH-Hs) were further reduced with hydrazine (Hz) or hydroiodic acid (HI) to improve their conductivities. The chemically reduced graphene hydrogels possess high conductivities of 1.3–3.2 S m –1, which are 1 order of magnitude higher t…
Three types of metals commonly used in automotive engine cooling systems are tested in cooling fluid for their polarization curves. Corrosion potentials obtained show the potential of copper is more significant than that of cast iron and cast aluminum, indicating the possibility of galvanic corrosion in the cooling sy…
This paper presents the analysis of the factors which influence the operation, durability and reliability of heat exchangers. Major attention was devoted to the corrosion influence while selecting the materials for manufacturing heat transfer plates and tubes of heat exchangers. The paper presents the examples o…
This report provides the first demonstration of a vacuum microelectronic device that utilizes both positive and negative charge states (i.e., a bipolar vacuum microelectronic device), thus enabling the possibility of device designs that are not previously possible in traditional vacuum microelectronics. In the same wa…
The novel chelating (QMCM) has been synthesized through copolymerization of 8-hydroxyquinoline and 4,4′-methylene bisphenol monomers in the presence of a base as a catalyst. The novel developed copolymer ligand (H2L) has been used to prepare a series of five polymeric chelates (ML) using transition metal ions. The che…
Abstract Nanometric Co/Mg, Co/Mg/B 4 C, Al/SiC and Al/Mo/SiC periodic multilayers deposited by magnetron sputtering are studied in order to correlate their optical performances in the extreme ultraviolet (EUV) range to their structural quality. To that purpose, our recently developed methodology based on high‐resoluti…
Microporous membranes were prepared from polyaniline-diluent systems by exploiting the thermally induced phase separation, using three polymer concentrations, two quenching temperatures, and different extraction conditions. Both binodal and spinodal curves of polyaniline-diluent systems were determined by differential…
Abstract In this article, calcium carbonate filled low density polyethylene (LDPE) was prepared and the influence of filler content, particle size, and surface treatment with stearic acid on the strain hardening and viscoelastic properties of the composites were investigated. Both elongational and shear rheological me…
Abstract Poly(quinoxaline‐2,3‐diyl)s bearing alkoxy pendants was synthesized by living polymerization of 4,5‐dialkoxy‐3,6‐dimethyl‐1,2‐diisocyanobenzenes, which were easily accessible from 3,6‐dimethylcatechol, using organonickel complexes as initiators. Thermal properties of the obtained polymers were fully determine…
Since its introduction, liquid viscosity and relaxation time $\ensuremath{\tau}$ have been considered intrinsic properties of a system that is essentially local in nature and therefore independent of system size. Dielectric relaxation experiments are performed in glycerol, and it is discovered that this is the case at…
The nanocomposites of epoxy-modified Mesua ferrea L. seed-oil-based polyester resin were designed with 0-5 wt% loadings of organophillic montmorrilonite (OMMT). X-ray diffraction, transmission electron microscopy, and scanning electron microscopy studies revealed very good dispersion of OMMT with exfoliated structure…
Abstract A facile and easily industrialized approach for preparing highly dispersed MMT/polymer nanocomposites is developed by combining the latex compounding method and a spray‐drying process. Clay particles are successfully delaminated into layers, and layer re‐stacking is effectively prevented. HR‐TEM and XRD resul…
The ferroelectric [001], [011], and [111] instabilities in ${\mathrm{KNbO}}_{3}$ with up to 12.5 mol% Cu on K or Nb sites, respectively, are investigated using both ab initio density-functional theory and classical interatomic potentials. A doping level of only about 2--4 mol% Cu on K sites enhances the ferroelectric…
Abstract Polyamide 11 (PA 11)/silica nanocomposites were prepared via in situ melt polymerization by the dispersion of hydrophobic silica in 11‐aminoundecanoic acid monomer. Their isothermal crystallization process and melting behaviors were analyzed by differential scanning calorimetry. The isothermal crystallization…