Inorganic/organic hybrids, ceramic precursor polymers, composites: specialty materials of the future?
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Adiabatic measurements of magneto-caloric effects in pulsed high magnetic fields up to 55 T
Magneto-caloric effects (MCEs) measurement system in adiabatic condition is proposed to investigate the thermodynamic properties in pulsed magnetic fields up to 55 T. With taking the advantage of the fast field-sweep rate in pulsed field, adiabatic measurements of MCEs were carried out at various temperatures. To obta…
Investigation of Unique Total Ionizing Dose Effects in 0.2 um Partially-Depleted Silicon-on-Insulator Technology
The total ionizing dose irradiation (TID) effects of partially depleted (PD) silicon-on-insulator (SOI)devices which fabricated with a commercial 0.2 um SOI process are investigated. Experimental results show an original phenomenon that the ON irradiation bias configuration is the worst-case bias for both front-gate a…
Magnetism driven ferroelectricity above liquid nitrogen temperature in Y2CoMnO6
We report multiferroic behaviour in double perovskite Y2CoMnO6 with ferroelectric transition temperature Tc = 80 K. Both X-ray diffraction and neutron scattering data confirm a centro-symmetric crystal structure of space group P21/n at room temperature. The saturation polarization and magnetization are estimated to be…
Pyroelectric origin of the carrier density modulation at graphene-ferroelectric interface
Using continuous media theory approach we study the static and high-frequency heat dissipation in multi-layer graphene on a ferroelectric. Performed calculations have proved that the pyroelectric effect can modify essentially the free carrier density at the graphene-ferroelectric interface and consequently the conduct…
Engineered silica nanoparticles act as adjuvants to enhance allergic airway disease in mice
BACKGROUND: With the increase in production and use of engineered nanoparticles (NP; ≤ 100 nm), safety concerns have risen about the potential health effects of occupational or environmental NP exposure. Results of animal toxicology studies suggest that inhalation of NP may cause pulmonary injury with subsequent acute…
Uncertainty Quantification in Multiscale Simulation of Materials: A Prospective
Simulation has long since joined experiment and theory as a valuable tool to address materials problems. Analysis of errors and uncertainties in experiment and theory is well developed; such analysis for simulations, particularly for simulations linked across length scales and timescales, is much less advanced. In thi…
ε-Decalactone: A Thermoresilient and Toughening Comonomer to Poly(l-lactide)
The renewable monomer ε-decalactone is an excellent partner to L-lactide, where their copolymers overcome inherent drawbacks of polylactide, such as low thermal stability and brittleness. ε-Decalactone is a seven-membered lactone that was successfully polymerized with Sn(Oct)(2) and 1,5,7-triazabicyclo[4.4.0]dec-5-ene…
Density Functional Theory Models for Radiation Damage
Density functional theory models developed over the past decade provide unique information about the structure of nanoscale defects produced by irradiation and about the nature of short-range interaction between radiation defects, clustering of defects, and their migration pathways. These ab initio models, involving n…
Formation of hexagonal and cubic ice during low-temperature growth
From our daily life we are familiar with hexagonal ice, but at very low temperature ice can exist in a different structure--that of cubic ice. Seeking to unravel the enigmatic relationship between these two low-pressure phases, we examined their formation on a Pt(111) substrate at low temperatures with scanning tunnel…
Significant disorder-induced enhancement of the magnetization of Fe2CrGa by ball milling
It is reported that ball milling gives rise to a different atomic configuration in Fe2CrGa than the order obtained upon preparation by arc melting. After ball milling, the magnetic moment has values of 3.2 to 3.9 μB/f.u., which is significantly higher than in arc-melted samples, and the Curie temperature increases by…
Magnetic properties of BiFeO3micro-cubes synthesized by microwave agitation
In this article, we present results of field cooled (FC) and zero field cooled (ZFC) magnetization measurements and investigation of aging and memory effect in bismuth ferrite (BFO) multiferroic micro-cubes obtained by means of simple microwave synthesis procedure. It is found that difference between FC and ZFC magnet…
High TMR Ratio in ${\rm Co}_{2}{\rm FeSi}$ and ${\rm Fe}_{2}{\rm CoSi}$ Based Magnetic Tunnel Junctions
Magnetic tunnel junctions with Fe1+zCo2-xSi (0 ≤ x ≤ 1)electrodes and MgO barrier were prepared on MgO substrates by magnetron co-sputtering. Maximum tunnel magnetoresistance (TMR) ratios of 262% at 15 K and 159% at room temperature were observed for x = 0.75. Correlations of the annealing temperature dependent atomic…
Nanoscale Dielectric Capacitors Composed of Graphene and Boron Nitride Layers: A First-Principles Study of High Capacitance at Nanoscale
We investigate a nanoscale dielectric capacitor model consisting of two-dimensional, hexagonal h-BN layers placed between two commensurate and metallic graphene layers using self-consistent field density functional theory. The separation of equal amounts of electric charge of different sign in different graphene layer…
Exploring Pretreatment–Morphology Relationships: Ab Initio Wulff Construction for RuO2 Nanoparticles under Oxidising Conditions
Abstract We present a DFT‐based Wulff construction of the equilibrium shape of RuO 2 particles in an oxygen environment. The obtained intricate variations in the crystal habit with the oxygen chemical potential allow for a detailed discussion of the dependence on the oxidising pretreatment used in recent powder cataly…
Air transparent soundproof window
A soundproof window or wall which is transparent to airflow is presented. The design is based on two wave theories of diffraction and acoustic metamaterials. It consists of a three-dimensional array of strong diffraction-type resonators with many holes centered at each individual resonator. The acoustic performance le…
Electronic fine structure in the nickel carbide superconductor Th$_{2}$NiC$_{2}$
The recently reported nickel carbide superconductor, body centered tetragonal $I4/mmm$ Th$_2$NiC$_2$ with T$_c$ = 8.5 K increasing to 11.2 K upon alloying Th with Sc, is found to have very fine structure in its electronic spectrum, according to density functional based first principles calculations. The filled Ni 3d b…
Magnetic and transport parameters of LSMO and YBCO/LSMO films deposited on sapphire substrates
The La0.7Sr0.3MnO3 (LSMO) layers and YBa2Cu3O7-δ/La0.7Sr0.3MnO3 (YBCO/LSMO) bilayers were grown by magnetron sputtering on sapphire (Al2O3 or ALO) substrates. Temperature dependences of resistance of single LSMO films, grown on ALO substrates were typical for polycrystalline manganite materials and the resistance decr…
Formation of isolated islands by size-selected copper nanocluster deposition
Deposition of size-selected metal nanoclusters on a substrate with very low kinetic energy helps to keep the clusters intact with respect to their shape and size as compared to clusters in ight condition. Here we report formation of isolated monodispersed islands of copper of desired size on carbon film by deposition…
Growth and electrical characterization of Al0.24Ga0.76As/AlxGa1-xAs/Al0.24Ga0.76As modulation-doped quantum wells with extremely low x
We report on the growth and electrical characterization of modulation-doped Al0.24Ga0.76As/AlxGa1-xAs/Al0.24Ga0.76As quantum wells with mole fractions as low as x=0.00057. Such structures will permit detailed studies of the impact of alloy disorder in the fractional quantum Hall regime. At zero magnetic field, we extr…