Materials Literature
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The authors investigated shot noise properties in the graphene-based double barriers. The shot noise with the Fano factor equal to 1∕3 is found to occur at all conductance minimums including the Dirac point, which is a combined result of Klein tunneling, resonant tunneling, and quasiparticle chirality. The similarity…
Thermal treatment transforms α‐Ca 2 [SiO 3 (OH)](OH) (α‐C 2 SH) into hydraulic Ca 2 SiO 4 polymorphs, which is a process of considerable interest to the cement chemistry community. The thermal behavior of differently synthesized samples of α‐C 2 SH in air at ambient pressure has been investigated in detail by high‐tem…
This paper dealt with the electrical properties of Ga:ZnO film deposited via pulsed laser deposition and the mechanisms responsible for conduction and scattering behavior in terms of temperature. Such film having a degenerate band exhibited the metallic characteristics except those observed below 100 and 60K for films…
Abstract Thermoresponsive shape memory polymers based on polyurethane with soft segment consisting of poly (tetramethylene oxide) (PTMO) and hard segment arising from urethane reaction of tolylene diisocyanate with OH terminal of PTMO and 1,4 butane diol (BD) were synthesized by a two‐ step process. The molar ratios o…
Abstract Sulfonated styrene-(ethylene-butylene)-styrene triblock copolymer (SSEBS) was synthesized by reaction of acetyl sulfate with SEBS. SSESB-clay nanocomposites were then prepared from hydrophilic Na-montmorillonite (MT) and organically (quaternary amine) modified hydrophobic nanoclay (OMT) at very low loading. S…
We studied the phase transitions, domain morphologies, and polarizations in BaTiO3∕SrTiO3 superlattices grown on SrTiO3 substrates. Using the phase field approach, we discovered the remarkable influence of film/substrate interfacial coherency on the ferroelectricity of the SrTiO3 layers within a superlattice: it is an…
In this paper, we report on the use of two PTCDI-melamine supramolecular networks on Au(111) to trap C70 molecules. The different supramolecular networks were formed by changing the postannealing temperature after molecular deposition. We observed, using scanning tunneling microscopy, that the deposition of C70 onto a…
(1− x )BiScO 3 − x PbTiO 3 (BSPT) nanopowder with an average grain size of 10 nm with the composition of x =0.64, which has been reported to be close to the MPB in the bulk BSPT ceramics, was successfully synthesized. Subsequently, the techniques of preparation of high‐performance fine‐grain MPB–BSPT ceramics by two‐s…
Multiwavelength Raman spectroscopy is employed to investigate ultrananocrystalline diamond films deposited by the plasma enhanced chemical vapor deposition technique. Recently, we have shown that the addition of nitrogen in the gas source during synthesis induce the formation of diamond $n$-type films, exhibiting the…
The effects of noble metal (NM) dopants (NM = Pt, Rh) on the structural and electronic properties of ceria are studied using a density functional theory (DFT) method, with the inclusion of on-site Coulomb interaction (DFT+ U ). It is found that these NM dopants give rise to large perturbations of the atomic and electr…
(1− x )(K 0.48 Na 0.52 )(Nb 0.95 Ta 0.05 )O 3 – x LiSbO 3 [(1− x )KNNT− x LS] lead‐free piezoelectric ceramics were prepared by the conventional solid‐state sintering method. A morphotropic phase boundary (MPB) between orthorhombic and tetragonal phases was identified in the composition range of 0.03< x <0.05. T…
Laminated composites of magnetostrictive and piezoelectric layers have been developed for their magnetoelectric (ME) product tensor properties. In spite of the considerable progress in materials aspects, little attention has been given to ME laminate incorporation into a detection technology. Here, we present a ME tec…
Best PALs. We have applied a photoswitchable affinity label (PAL) to the optical control of protein function. The enzymatic activity of native carbonic anhydrase was controlled with covalently tethered, photoswitchable inhibitors (see scheme). This system allows the photoregulation of native proteins without site-spec…
A new 3D porous and biostable collagen scaffold has been developed to improve the biocompatibility of implantable glucose sensors by minimizing tissue reactions while stimulating angiogenesis around the sensors. The novel collagen scaffold was crosslinked using nordihydroguaiaretic acid (NDGA) to enhance biostability.…
The surface of superparamagnetic iron oxide nanoparticles (SPIO) with different molecular weight of poly(ethylene glycol) (PEG) and folic acid (FA) were synthesized. The SPIO-PEG-FA nanoparticles are well-dispersed and have good stability in various pH solutions. The lack of hysterestis and remanence at ambient temper…
Atomistic modelling studies of the apatite-type oxide ion conductor La9.33(GeO4)6O2 show that a key role of the O4 channel oxygen atoms appears to be as a reservoir for the creation of interstitial oxide ion defects, while the migration of these defects proceeds via the GeO4 tetrahedra.
In this paper, a systematic approach to the design of bulk isotropic magnetic metamaterials is presented. The roles of the symmetries of both the constitutive element and the lattice are analyzed. For this purpose, it is assumed that the metamaterial is composed of cubic split ring resonators (SRRs) arranged in a cubi…
The effect of grain size of magnesia and its content as well as spark plasma sintering conditions on the density, grain size, strength, hardness, and toughness of alumina was investigated. Spark plasma sintering conditions were optimized at 1150°C/5 min/175°C/min. Addition of 100 nm magnesia gave higher density levels…
In this work the homogenization approach recently proposed in [M. Silveirinha, Phys. Rev. B 75, 115104 (2007)] is applied to derive the analog of the classical Lorentz-Lorenz formula in a generic dielectric crystal, considering the effects of frequency and spatial dispersion. In particular, we obtain a rigorous formul…
Abstract The hybridization of thermoplastic natural rubber based on carbon fiber (CF) and kenaf fiber (KF) was investigated for its mechanical and thermal properties. Hybrid composites were fabricated with a melt‐blending method in an internal mixer. Samples with overall fiber contents of 5, 10, 15, and 20 vol % were…