Materials Literature
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We have studied and compared the electrical and magnetic behavior of sub-micron-sized polycrystalline and epitaxial chromium dioxide $(\mathrm{Cr}{\mathrm{O}}_{2})$ wires, grown using a selective-area growth technique. Low-temperature transport measurements have shown that the dc resistivity of polycrystalline $\mathr…
This work presents a model for the magnetic Barkhausen jump in low carbon content steels. The outcomes of the model evidence that the Barkhausen jump height depends on the coercive field of the pinning site and on the mean free path of the domain wall between pinning sites. These results are used to deduce the influen…
We determine atomic and electronic structures of boron- and/or nitrogen-doped carbon nanotubes (CNTs) and carbon-doped boron nitride nanotubes (BN-NTs) of armchair and zigzag types using first-principles pseudopotential-based density functional theory calculations. For comparison, we also determine the atomic and elec…
The bulk magnetization at temperatures of $1.8--400\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and in magnetic fields up to $70\phantom{\rule{0.3em}{0ex}}\mathrm{kOe}$, the ambient temperature $^{13}\mathrm{C}$ NMR spin-lattice relaxation, ${T}_{1,C}$, and the elemental composition of three nanodiamond powder samples have…
Abstract The composite casts were prepared from native corn starch and low density polyethylene. Ethylene‐arylic acid copolymer (EAA) was added as compabilizer and glycerol was added as plasticizer in the formulation. Their rheological and thermal properties were evaluated by capillary rheometry, differential scanning…
Abstract The mechanical behavior of poly(di‐methyl siloxane) (PDMS) composites containing high volume fractions of natural CaCO 3 particles of various particle size distributions was studied under tensile and oscillatory bending stresses, emphasizing the unique behavior of high filler loaded compositions. Composites c…
We report here an anomalous peak in the composition dependence of the dielectric permittivity of non-ferroelectric $(1\ensuremath{-}x)\mathrm{Na}\mathrm{Nb}{\mathrm{O}}_{3}\text{\ensuremath{-}}x\mathrm{Ca}\mathrm{Ti}{\mathrm{O}}_{3}$ ceramics for the composition range $0.10<x<0.20$. This is reminiscent of a simi…
Electrical properties of Nb-, V-, and W-doped Bi4Ti3O12–MBi4Ti4O15 (BIT-MBTi) (M=Ca,Sr) compounds were investigated. The remanent polarization (2Pr) and piezoelectric coefficient (d33) of BIT-MBTi are greatly increased by such donor doping. W-doped and Nb-doped BIT-SBTi exhibited the greatest enlargement in 2Pr and d3…
We report transient absorption saturation measurements on lead sulfide colloidal nanocrystals at the first and second exciton energies and fit the results to a model incorporating intraband and interband relaxation processes. We study in detail the Auger recombination from the first excited state, which takes place wh…
We combine electron irradiation experiments in a transmission electron microscope with kinetic Monte Carlo simulations to determine the mobility of interstitial carbon atoms in single-walled carbon nanotubes. We measure the irradiation dose necessary to cut nanotubes repeatedly with a focused electron beam as a functi…
Iron palladium based alloys are promising candidates to realize miniaturized magnetic shape memory devices on a thin film basis and also bear interesting magnetic properties, particularly for the area of magnetic recording. To address the impact of growth conditions on physical properties, thin vapor-deposited Fe70Pd3…
Abstract The effect of processing variables (filler and blowing agent loadings) and operating variables (frequency and sample thickness) on the impedance and electromagnetic interference (EMI) shielding effectiveness of excess conductive carbon black reinforced solid and microcellular EPDM vulcanizates has been invest…
We explore the renormalization group flow of quartic perturbations in the low-enegy theory of graphene, in the strong Coulomb coupling and large-$N$ limits, where $N$ is the number of fermion flavors. We compute the anomalous dimensions of the quartic couplings $u$ up to leading order in $1∕N$ and find both relevant a…
Enhanced electron field emission (EFE) properties for ultrananocrystalline diamond (UNCD) films grown on silicon substrate were achieved, especially due to the high dose N ion implantation. Secondary ion mass spectroscopy, Raman spectroscopy, and x-ray photoelectron spectroscopy measurements indicated that the N ion i…
Ni doping Ti0.5Zr0.25Hf0.25Co1−xNixSb (x=0–0.05) half-Heusler compounds have been fabricated by combining high-frequency induction melting with spark plasma sintering technique, and their thermoelectric transport properties have been investigated in the temperature range of 300–900K. With the increase of Ni doping con…
Charge-carrier transport properties in chemically deposited thin films composed of close-packed tin(II) selenide nanocrystals were studied both in the dark and under conditions when internal photoelectric effect is manifested in the nanostructured material. Stationary and time-resolved experiments were performed to ch…
Lanthanide-binding tags (LBTs) are small, genetically encoded, versatile protein fusion partners that selectively bind lanthanide ions with high affinity. The LBT motif features a strategically positioned tryptophan residue that sensitizes Tb3+ luminescence upon excitation at 280 nm. Herein, we describe the preparatio…
This study presents the potential of quantum dots as two-photon sensitizers for attached energy acceptors. With two-photon absorption cross sections, which are orders of magnitudes higher than those of any molecule, quantum dots constitute outstanding NIR sensitizers. The successful energy transfer to conjugated phtha…
We report a systematic investigation on the structural and magnetic properties of molecular-beam epitaxial growth of CrTe thin films with different layer thicknesses and Cr∕Te flux ratios. A phase diagram of the growth parameters is established based on the detailed analyses of the reflection high-energy electron diff…
Abstract The influence of polymer matrix molecular weight and filler particle size on rheological properties and extrudate distortions of metallocene polyethylene (mPE)/wood flour (WF) composites has been investigated by rotational and capillary rheometers. It was found that at low shear rates smaller filler particles…