Materials Literature
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The effect of LiNbO3 (LN) addition on the ferroelectric behavior and piezoelectric properties of Bi0.5(Na0.80K0.20)0.5TiO3 (BNKT20) lead-free piezoceramics were systematically investigated. Results showed that the LN substitution into BNKT20 induced a transition from coexistence of ferroelectric tetragonal and rhomboh…
The survival of pathogenic bacteria in the oral cavity depends on their successful adhesion to dental surfaces and their ability to develop into biofilms, known as dental plaque. Bacteria from the dental plaque are responsible for the development of dental caries, gingivitis, periodontitis, stomatitis and peri-implant…
In recent years, the number of nominally nonmagnetic solids showing magnetic order induced by some kind of defect has increased continuously. From the single element material graphite to several covalently bonded nonmagnetic compounds, the influence of defects like vacancies and/or nonmagnetic ad-atoms on triggering m…
Precipitate hardening is commonly used in materials science to control strength by acting on the number density, size distribution, and shape of solute precipitates in the hardened matrix. The Fe-Cu system has attracted much attention over the last several decades due to its technological importance as a model alloy f…
We propose a promising two-dimensional nano-sheet of SiC2 (SiC2-pentagon) consisting of tetrahedral silicon atoms and triple-linked carbon atoms in a fully-pentagon network. The SiC2-pentagon with buckled configuration is more favorable than its planar counterpart and previously proposed SiC2-silagraphene with tetra-c…
The existence and localization of collective electron states for nanodiamond particles were studied both by solving a one-particle one-dimensional Schrödinger equation in the Kronig-Penney potential and by ab initio computations of ground state wavefunctions of diamondoids C78H64, C123H100 and C211H140 at the DFT R-B3…
Electromechanical and magnetoelectric properties of Metglas/LiNbO3/Metglas trilayers have been studied in the frequency range from 20 Hz to 0.4 MHz. A trilayer of Metglas/PMN-PT/Metglas prepared in the same way was used as a reference. Though PMN-PT has much larger charge piezocoefficients than LiNbO3 (LNO), the direc…
Atmospheric pressure plasma processing has attracted significant interests over decades due to its usefulness and a variety of applications. Adhesion improvement of polymer surfaces is among the most important applications of atmospheric pressure plasma treatment. Reflecting recent significant development of the atmos…
A novel dual drug delivery system is presented using triaxial structured nanofibers, which provides different release profiles for model drugs separately loaded in either the sheath or the core of the fiber. Homogenous, coaxial and triaxial fibers containing a combination of materials (PCL, polycaprolactone; PVP, poly…
Better than sliced bread: Layered two-dimensional graphene-based conjugated microporous polymers, which exhibit high surface areas and fluorescence quenching, can be prepared by a graphene-mediated Sonogashira–Hagihara coupling. Upon thermal pyrolysis, these porous polymers are readily converted into porous carbon mat…
Room-temperature solution-processed ultrathin 2D MoS2 nanosheets are integrated into organic solar cells as an efficient hole extraction layer. An enhanced power conversion efficiency of 8.11% is achieved, which is superior to that of traditional vacuum-evaporated molybdenum oxide.
Owing to their antimicrobial properties, silver nanoparticles (NPs) are the most commonly used engineered nanomaterial for use in a wide array of consumer and medical applications. Many discussions are currently ongoing as to whether or not exposure of silver NPs to the ecosystem (i.e. plants and animals) may be conce…
This paper reports the enhancement of long-term oxidation of copper at room temperature by a graphene coating. Previous studies showed that graphene is an effective anticorrosion barrier against short-term thermal and electrochemical oxidation of metals. Here, we show that a graphene coating can, on the contrary, acce…
Polyurethanes are the only class of polymers that display thermoplastic, elastomeric, and thermoset behavior depending on their chemical and morphological makeup. In addition to compact polyurethanes, foamed variations in particular are very widespread, and they achieve their targeted properties at very low weights. T…
The electronic structure of transition metal oxides is frequently studied using density functional theory. Nonetheless, the electronic structure of VO3 has been found to be sensitive to the choice of functional. As a consequence, the basic question of whether or not the ground electronic state exhibits a Jahn-Teller d…
M-type lead hexaferrites with compositions of PbFe12O19 and PbSnZnFe10O19 were synthesized by the citrate sol–gel method. The structural and magnetic properties of resultant particles were investigated by X-ray diffraction (XRD), transmission electron microscope (TEM), vibrating sample magnetometer (VSM) and vector ne…
The paper reports on new results obtained for tetragonal quasi-2D antiferromagnetic Eu2CuO4 at temperatures below 30-40 K. A set of ferromagnetic resonance lines similar to ones obtained earlier for a number of multiferroic manganites (Sanina et al 2012 J. Phys.: Condens. Matter 24 346002), with similar electric polar…
Kern-Schale-Biohybridkapseln (siehe Bild), die flüchtige Verbindungen verkapseln können, entstehen durch Fällung von amorphem Siliciumdioxid in einem Protein-Polyanion-Koazervatgerüst. Dieses Gerüst gibt der Kapselhülle ihre endgültige Form und Struktur und stellt eine acide Mikroumgebung bereit, in der die Hydrolyse…
We have employed the x-ray resonant magnetic scattering (XRMS) technique at the Ru ${L}_{2}$ edge of the Ba(Fe${}_{1\ensuremath{-}x}$Ru${}_{x}$)${}_{2}$As${}_{2}$ ($x=0.205$) superconductor. We show that pronounced resonance enhancements at the Ru ${L}_{2}$ edge are observed at the wave vector which is consistent with…
The structural and photoluminescence properties of CaYAl3 O7 phosphor material doped with varying concentration of Mn(2+) have been studied. The phosphor material was synthesized by the combustion method at 500 °C and was characterized using X-ray diffraction, Fourier transform infrared spectroscopy and photoluminesce…