Materials Literature
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We establish the physics and understanding of nonlocal nanoscale wave propagation in carbon nanotubes (CNTs) based on nonlocal elastic stress field theory.This is done by developing an analytical nonlocal nanotube model based on the variational principle for wave propagation in CNTs.Specifically, we successfully deriv…
We investigated the inhomogeneities in the charge density of unintentionally doped graphene on SiO2 prepared by mechanical exfoliation. From the analysis of the G, D, and 2D phonon modes of the Raman spectra after displacing contaminants on graphene surface, and measuring the separation monolayer-substrate distance am…
Abstract Graphene showed an unusually high hydrogen storage capacity as well as a unique, slow hydrogen adsorption process compared with a variety of carbon materials (carbon nanotubes, activated carbons, mesoporous carbons, templated carbons, and metal organic frameworks). Catalytic dissociation of hydrogen on graphe…
We present a comparison of the magnetoelectric (ME) response and magnetic-field sensitivities of engineered laminate sensors comprised of magnetostrictive and piezoelectric phases. The ME voltage coefficients for Metglas and single crystal fibers of Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN-PT) or Pb(Zn1/3Nb2/3)O3–PbTiO3 (PZN-PT)…
A simple synthetic approach for the preparation of anisotropic Janus-like sub-micrometre sized hybrid magnetic particles consisting of inorganic superparamagnetic iron oxide nanoparticles and an organic polymer is demonstrated here. Two-step controlled processes, (a) the swelling of preformed magnetic oil in water fer…
A series of Ce3+ doped α-Sr2−2xCexNaxP2O7 phosphor compounds has been prepared using a high-temperature solid-state reaction technique. The luminescence properties under vacuum ultraviolet-UV and x-ray excitation were studied. Luminescence spectra reveal three UV-emitting peaks at about 310, 330, and 350 nm from which…
The growth of porous anodic films on iron has been examined at a constant current density of 50 A m −2 in 0.1 mol L −1 NH 4 F−ethylene glycol electrolytes containing 0.1−1.5 mol L −1 water. Nanoporous films are formed in all the electrolytes, with the growth rate increasing with the decrease in the water content of th…
PPy is a conducting polymer material that has been widely investigated for biomedical applications. hESCs and adult rNSCs were grown on four PPy surfaces doped with PSS or peptide from laminin (p20, p31, and a mixture of p20 and p31) respectively. After 7 d, both PPy/p20 and PPy/p31 promoted neuroectoderm formation fr…
We have reexamined the fluorescence polarization anisotropy of single polymer chains of the prototypical conjugated polymer poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) isolated in a poly(methyl methacrylate) (PMMA) matrix employing improved synthetic samples that contain a much smaller number…
Vanadium dioxide undergoes a metal–insulator transition, in which the strain condition plays an important role. To investigate the strain contribution, a phenomenological thermodynamic potential for the vanadium dioxide single crystal was constructed. The transformations under the uniaxial stress, wire, and thin film…
Cobalt ferrite nanoparticles were synthesized via the hydrothermal route with the addition of trisodium citrate dihydrate (Na3CA⋅2H2O). The characterizations including x-ray diffraction (XRD) and transmission electron microscope showed that the products of this hydrothermal reaction are composed of cobalt ferrite nano…
Functional and composite nanodiamonds (NDs) are rapidly emerging as promising materials for the next generation for quantum information processing, electronic material, magnetotometry, novel imaging, and IR fluorescence applications, etc. Nanocomposites of ND particles with conductive polymers [i.e., polyaniline (PANI…
Magnetic nanoparticles have shown promise in the fields of targeted drug delivery, hyperthermia and magnetic resonance imaging (MRI) in cancer therapy. The ability of magnetic nanoparticles to undergo surface modification and the effect of external magnetic field in the dynamics of their movement make them an excellen…
High infrared bolometric photoresponse has been observed in multiwall carbon nanotube (MWCNT) films at room temperature. The observed detectivity D∗ in exceeding 3.3×106 cm Hz1/2/W on MWCNT film bolometers is a factor of 7 higher than that obtained on the single-wall CNT (SWCNT) counterparts. The response time of abou…
A new type of fluorophosphate glasses with high thulium doping concentration (up to 10 mol % Tm3+) is investigated. The intensive 1.8 μm fluorescence is demonstrated with lower concentration quenching. On the basis of the measured Raman spectroscopy, it is revealed that the glass structure will be changed when adding…
While the oxidative stability of single walled carbon nanotubes has been studied extensively, very little is known about the diameter dependence of oxidative stability in multiwalled carbon nanotubes (MWNTs) and the effect of vacuum annealing on such stability. We have investigated six sets of samples with different d…
The spontaneous strain associated with the structural change in the metal-insulator transition in VO2 is orders of magnitude higher than thermal expansion mismatch used in bimetallic strips. Here we show that this strain can be leveraged to thermally activate bending of crystalline VO2-based bilayer microcantilevers a…
We present the results of density functional theory and Boltzmann transport calculations suggesting that the commonly available and inexpensive material SnS may show reasonable thermoelectric performance at temperatures suitable for exhaust waste heat recovery, if the material can be heavily p-doped and if the mobilit…
Abstract: The addition of microbial transglutaminase (MTGase) generally increased the gel strength of lizardfish ( Saurida spp.) scale gelatin gels ( P ≤ 0.05) with an increase in gel strength with the addition of MTGase up to 0.5% (w/v). The texture profile analysis compression tests of lizardfish scale gelatin gel w…
We use first-principles density-functional theory calculations to investigate the dependence of tetragonality on local structure in a variety of ferroelectric solid solutions. We demonstrate that tetragonality is strongly coupled to the $B$-cation displacement and weakly coupled to the $A$-cation displacement. Examina…