Conductive polymer composites with double percolated architecture of carbon nanoparticles and ceramic microparticles for high heat dissipation and sharp PTC switching
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Structure and Mechanical Properties of Polycarbonate Modified Clay Nanocomposites
Polycarbonate (PC)/modified clay nanocomposites were prepared, in the absence and presence of different amounts of maleic anhydride grafted polypropylene (PP-g-MA), by direct melt blending. Their structures, as well as mechanical, morphological and thermal properties, were characterized by X-ray diffractometry (XRD),…
Oxygen incorporation in Ti2AlC thin films
Thin films of Ti2AlC MAX phase have been deposited using a multiple cathode pulsed cathodic arc. Evidence for substantial oxygen incorporation in the MAX phase is presented, likely originating from residual gas present in the vacuum chamber during deposition. The characteristic MAX phase crystal structure is maintaine…
Strain-mediated magnetoelectric coupling in BaTiO3-Co nanocomposite thin films
The authors present a metal-ceramic type composite film in which Co particles with the mean size of 70nm are uniformly dispersed in an insulating ferroelectric BaTiO3 (BTO) matrix. Transmission electron microscopy images revealed that the Co particle was tightly surrounded with the BTO matrix in atomic scales. The mag…
Characterization of porous poly(D,L‐lactic‐co‐glycolic acid) sponges fabricated by supercritical CO2 gas‐foaming method as a scaffold for three‐dimensional growth of Hep3B cells
This study presents the application of the porous poly(D,L-lactic-co-glycolic acid) (PLGA) sponges fabricated from an organic solvent free supercritical gas foaming technique. Two formulations of PLGA sponges with different co-polymer compositions (85:15 and 50:50) were fabricated as novel scaffolds to guide human hep…
Multiferroic CoFe2O4–Pb(Zr0.52Ti0.48)O3 nanofibers by electrospinning
Multiferroic materials possess two or more types of orders simultaneously that couple the electric and magnetic fields, and composite multiferroics have been widely explored for their excellent magnetoelectric coupling. In this letter, we report a strategy to hybrid multiferroicity at nanoscale. Multiferroic CoFe2O4–P…
A facile route of polythiophene nanoparticles via Fe3+‐catalyzed oxidative polymerization in aqueous medium
Abstract We have demonstrated that unsubstituted thiophene can be polymerized by Fe 3+ ‐catalyzed oxidative polymerization inside nanosized thiophene monomer droplets, that is, nanoreactors, dispersed in aqueous medium, which can be performed under acidic solution conditions with anionic surfactant. Besides, we propos…
Scattering-Free Plasmonic Optics with Anisotropic Metamaterials
We develop an approach to utilize anisotropic metamaterials to solve one of the fundamental problems of modern plasmonics--parasitic scattering of surface waves into free-space modes, opening the road to truly two-dimensional plasmonic optics. We illustrate the developed formalism on the examples of plasmonic refracto…
Strain induced magnetoelectric coupling between magnetite and BaTiO3
Magnetite (Fe3O4) thin films have been grown on ferroelectric BaTiO3 (BTO) single crystal substrates by pulsed laser deposition. Transmission-electron microscope observations demonstrate the orientation relationship between Fe3O4 and BTO as [400]Fe3O4∥[200]BTO and [004]Fe3O4∥[002]BTO. Experimental measurements of magn…
Optical measurement of thermal transport in suspended carbon nanotubes
Thermal transport in carbon nanotubes is explored using different laser powers to heat suspended single-walled carbon nanotubes ∼5μm in length. The temperature change along the length of a nanotube is determined from the temperature-induced shifts in the G band Raman frequency. The spatial temperature profile reveals…
Epitaxial (001) BiFeO3 membranes with substantially reduced fatigue and leakage
We report substantially reduced fatigue and electrical leakage in BiFeO3 membranes fabricated by releasing epitaxial (001) BiFeO3 films from the Si substrates on which they were grown. Fatigue-free switching behavior of up to 1010cycles was observed for BiFeO3 membranes with Pt top electrodes, while as-grown films bre…
Alignment layer effects on thin liquid crystal cells
Factors affecting the thin cell performance of a liquid crystal cell are analyzed. Examples based on vertically aligned thin cells are given to illustrate these effects. When the cell gap is below ∼2μm, the liquid crystal alignment material, layer thickness, and anchoring energy all play important roles. The first two…
A stable lotus-leaf-like water-repellent copper
The stable lotus-leaf-like superhydrophobic copper was fabricated by means of a very simple and industrially up scalable method. Under both the growth of CuO microcrystals on the surface and the chemical modification, the wettability of the copper substrate changed from hydrophilic to water-repellent superhydrophobic,…
Transitions of tethered polymer chains: A simulation study with the bond fluctuation lattice model
A polymer chain tethered to a surface may be compact or extended, adsorbed or desorbed, depending on interactions with the surface and the surrounding solvent. This leads to a rich phase diagram with a variety of transitions. To investigate these transitions we have performed Monte Carlo simulations of a bond fluctuat…
Fabrication of single-walled carbon nanotube flexible strain sensors with high sensitivity
This work demonstrates a fabrication technique of high sensitivity flexible strain sensors at room temperature. The grown well-aligned millimeter-long single-walled carbon nanotube (SWCNT) was transferred from the silicon substrate to the pretrenched flexible substrate. The sensor design allows effective adhesion betw…
Ferromagnetism in Cu-doped ZnO films: Role of charge carriers
We report the observation of room temperature ferromagnetism in Cu-doped (5%) ZnO films grown on c-plane sapphire substrates. Films were prepared by pulsed laser deposition technique and were thoroughly characterized using several state-of-the-art characterization techniques. Hall measurements showed that the films ar…
Electrical and thermal transport in single nickel nanowire
The thermal conductivity and electrical resistivity of a suspended nickel nanowire have been measured for T=15–300K. The temperature dependence of the thermal conductivity and the Lorenz number strongly differ from the bulk. The comparison of the transports in the Ni nanowire shows, that at temperatures 75<T&am…
Enhancement in magnetoelectric response in CoFe2O4–BaTiO3 heterostructure
Co Fe 2 O 4 – Ba Ti O 3 heterostructure was epitaxially grown on the (001)-SrTiO3 substrate via pulsed laser deposition, in which the bottom BaTiO3 layer epitaxially grown on the substrate acts as a buffer layer and effectively reduces the coherent constraint in the magnetic layer arising from the substrate. Microstru…
Quantum effects for ballistic transport in spintronic devices
Recent fabrication of atomic precision nanodevices for spintronics greatly boosted their performance and also revealed new interesting features, as oscillating magnetoresistance with number of atomic layers in a multilayered structure. This motivates the need to go beyond the usual theoretical approach of semi-classic…
Elastic effects on relaxation volume tensor calculations
Relaxation volume tensors quantify the effect of stress on diffusion of crystal defects. Continuum linear elasticity predicts that calculations of these parameters using periodic boundary conditions do not suffer from systematic deviations due to elastic image effects and should be independent of supercell size or sym…