Materials Literature
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We report a new method for quantitative estimation of graphene layer thicknesses using high contrast imaging of graphene films on insulating substrates with a scanning electron microscope. By detecting the attenuation of secondary electrons emitted from the substrate with an in-column low-energy electron detector, we…
Detailed structural investigations on the substitution-induced structural phase transition from the rhombohedral phase to an orthorhombic phase in (Bi,RE)FeO3 epitaxial thin films (RE = La, Sm, and Dy) grown on (100) SrTiO3 substrates are presented. X ray diffraction reveals that the unit cell dimensions of the orthor…
We report magnetocaloric effect in polycrystalline La0.7−xPrxCa0.3MnO3 (x = 0.0, 0.25, 0.3, 0.35, 0.4, and 0.45) samples. The magnetic entropy change (ΔSm) was measured using a differential scanning calorimeter (DSC) working in a magnetic field environment. The ΔSm shows a peak around the ferromagnetic Curie temperatu…
Ca5Al2Sb6 is an inexpensive, Earth-abundant compound that exhibits promising thermoelectric efficiency at temperatures suitable for waste heat recovery. Inspired by our previous study of p-type Ca5−xNaxAl2Sb6, this work investigates doping with Zn2+ on the Al3+ site (Ca5Al2−xZnxSb6). We find Zn to be an effective p-ty…
Understanding biomass structure and dynamics on a range of time and length scales is important for the development of cellulosic biofuels. Here, to enable length and time scale extension, we develop a coarse grain (CG) model for molecular dynamics (MD) simulations of cellulose. For this purpose, we use distribution fu…
The effect of alkaloids extracted from Isertia coccinea plant (AEIC) on the corrosion of C38 steel in 1 M hydrochloric acid was investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. Potentiodynamic polarization curves indicated that the extract behave as mixed-type i…
The direction of the secondary Bjerknes force between a free bubble and an attached bubble was experimentally investigated. The behavior of the two bubbles in an ultrasonic standing wave of 27 kHz was observed using an imaging system with a high-speed video camera. It was demonstrated experimentally that the direction…
The pyroelectric properties of polydomain epitaxial Pb(Zr${}_{1\ensuremath{-}x}$,Ti${}_{x}$)O${}_{3}$ thin films are investigated using a Ginzburg--Landau--Devonshire thermodynamic model. We explore the three major contributions to pyroelectric response in thin films, including intrinsic effects and previously neglect…
In this paper, we use applied mathematical modelling to investigate the storage of hydrogen molecules inside graphene-oxide frameworks, which comprise two parallel graphenes rigidly separated by perpendicular ligands. Hydrogen uptake is calculated for graphene-oxide frameworks using the continuous approximation and an…
Development of magnetic resonance imaging (MRI) contrast agents that can be readily applied for imaging of biological tissues under clinical settings is a challenging task. This is predominantly due to the expectation of an ideal MR agent being able to be synthesized in large quantities, possessing longer shelf life,…
We describe scanning tunneling microscopy and X-ray photoelectron spectroscopy studies of graphene films produced by sonication-assisted dispersion. Defects in these samples are not randomly distributed, and the graphene films exhibit a "patchwork" structure where unperturbed graphene areas are adjacent to heavily fun…
Initial stability at the placement and development of osseointegration are two major issues for implant survival. Implant stability is a mechanical phenomenon which is related to the local bone quality and quantity, type of implant, and placement technique used. The application of a simple, clinically applicable, non-…
Hexafunktionelle Terpyridinmonomere können lateral durch Metallsalze verbunden werden, was zu einem mechanisch stabilen, blattähnlichen Gebilde führt, das von der Luft-Wasser-Grenzfläche auf einen festen Träger überführt (siehe den gefalteten, ca. 1.4 nm dünnen Film) und über μm-große Löcher gespannt werden kann. Dies…
New properties of engineered nanomaterials raise great expectations for industrial, scientific as well as medical applications. At the same time concerns among consumers regarding the safety aspects of this new technology emerge. Furthermore, among the multitude of published studies, a considerable number do not revea…
Two novel coronenediimide (CDI) derivatives, CDI 2 and dinaphtho-CDI 4, were synthesized via straightforward synthetic routes completing the homologous series of coronene tetracarboxdiimides, which show remarkable optical properties with absorption wavelengths ranging from 380 to 600 nm, high absorption coefficients,…
$E$-type perovskite magnet HoMnO${}_{3}$ is considered to be a prototype Mn-Mn exchange-striction driven multiferroic. We have grown orthorhombic HoMnO${}_{3}$ single crystals and studied the directional dependence of their electric polarization P. The direction of P is not along the crystallographic $a$ axis, as pred…
The review aims at being an exhaustive summary of the use of Huisgen azide-alkyne dipolar addition in the synthesis of tetrapyrrolic compounds, mainly porphyrins, phthalocyanines, chlorins and bacteriochlorins.
In this study, the effects of loading levels of nano BN, nano SN and synthetic ND particles on the thermal and mechanical properties of silicone rubber were investigated. Nanoparticle-filled silicone rubber composites were prepared by cast molding process. In general, incorporation of thermally conductive nanoparticle…
There are a large number of research publications on the hot topic of environmental friendly lead-free piezoelectric materials worldwide in the last decade. The number of researchers and institutions involved from China is much larger than other countries or regions. The publications by Chinese researchers cover a bro…
Graphene has attracted much attention as one of promising candidates of future high-speed transistor materials because of its high carrier mobility of more than 10,000 cm2 V-1 s-1. Up to this point, we have focused on the contact properties as performance killers, as a very small density of states in graphene might su…