Materials Literature
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Chain conformations dictate many of the important physical properties of polymers including their dynamics. Using small angle neutron scattering, we probed chain conformations, specifically the radius of gyration ( R g ), in both SWCNT/polystyrene ( r SWCNT / R g ∼ 0.4) and MWCNT/polystyrene ( r MWCNT / R g ∼ 1) nanoc…
Ca 1- x Sr 1- x Eu 2 x SiO 4 (CaSrSiO 4 :Eu 2+ ) phosphors were prepared by a novel aqueous solution technique using propylene glycol-modified silane (PGMS), combined with a freeze-drying process. The precursors were heat-treated under a reducing atmosphere with BaCl 2 flux. X-ray diffraction indicated that the obtain…
Fruit preservation and packaging have been practiced since ages to maintain the constant supply of seasonal fruits over lengthened periods round the year. However, health and safety issues have attracted attention in recent decades. The safety and quality assurance of packaged fruits/fruit products are vital concerns…
A polymer based composite was prepared by using modified aluminum fibers and aluminum nanoparticles as fillers in polyimide matrix that resulted in the high thermal conductivity and low relative permittivity. It was found that silica coated aluminum fibers with the multilayer coating structures can significantly reduc…
Development of bioinert membranes to prevent blood clotting, tissue adhesion, and bacterial attachment is important for the wound healing process. In this work, two wound-contacting membranes of expanded poly(tetrafluoroethylene) (ePTFE) grafted with zwitterionic poly(sulfobetaine methacrylate) (PSBMA) and hydrophilic…
We studied the relationship between the mobility and dislocation density for recently discovered high-mobility Ba0.96La0.04SnO3 thin-films and found that the carrier density and mobility of the film, as high as 4.0×1020 cm−3 and 70 cm2 V−1s−1, respectively, decreased as the dislocation density increased. We determined…
We investigated a multilayer graphene-dielectric composite material, comprising graphene sheets separated by subwavelength-thick dielectric spacer, and found it to exhibit hyperbolic isofrequency wavevector dispersion at far- and mid-infrared frequencies allowing propagation of waves that would be otherwise evanescent…
We study origin of Rashba spin-orbit interaction at SrTiO${}_{3}$ surfaces and LaAlO${}_{3}$/SrTiO${}_{3}$ interfaces by considering the interplay between atomic spin-orbit coupling and inversion asymmetry at the surface or interface. We show that in a simple tight-binding model involving $3d$ ${t}_{2g}$ bands of Ti i…
Novel fluorescent mono- and bisboron complexes based on pyrimidine bearing β-iminoenolate ligands were synthesized, and their fluorescence properties were investigated. The nonsubstituted and trifluoromethyl-substituted monoboron complexes showed higher fluorescence quantum yield in solid state than in solution. The d…
Depending on the composition of the glass and the annealing procedure supplied, thermal annealing of silicate glasses in the system SiO 2 /Al 2 O 3 /AlF 3 /Na 2 O/Gd 2 O 3 /SmF 3 led to the precipitation of cubic or hexagonal NaGdF 4 nanocrystals. The glasses were already phase separated after casting and formed a dro…
We present a theoretical study on the impact of an active optical layer on the emission properties of an ultrathin luminescent film. While the study can be generalized to any material, we focus here on a simple layered medium composed of a conjugated polymers (CPs) thin film, a zinc oxide layer (ZnO) and a sapphire su…
We present many-body \textit{ab initio} calculations of the electronic and optical properties of semiconducting zigzag carbon nanotubes under uniaxial strain. The GW approach is utilized to obtain the quasiparticle bandgaps and is combined with the Bethe-Salpeter equation to obtain the optical absorption spectrum. We…
Spontaneous emission from crystal centers is influenced by both the photonic local density of states and non-radiative processes. Here, we monitor the spontaneous emission of single nitrogen vacancy (NV) centers as their host diamond is reduced in size from a large monolithic crystal to a nanocrystal by successive cyc…
We investigate the effect of the laser parameters of pulsed laser deposition on the film stoichiometry and electronic properties of LaAlO3/SrTiO3 (001) heterostructures. The La/Al ratio in the LaAlO3 films was varied widely from 0.88 to 1.15, and was found to have a strong effect on the interface conductivity. In part…
In the charge-ordered phase of strongly doped manganites La${}_{1\ensuremath{-}x}$Ca${}_{x}$MnO${}_{3}$ ($x\ensuremath{\ge}0.5$) absorption lines appear in the terahertz spectral range for commensurate $x$ values right below the charge-ordering temperature. They are connected to acoustic phonons that become optically…
The blown extrusion of poly(lactic acid) (PLA) presents several challenges mainly due to the poor shear and elongation properties of this biopolymer. This article highlights some promising routes to enhance the processability of PLA for blown extrusion. To achieve this objective, various formulations of PLA with multi…
Measurements of anisotropic transport properties (dc and high-frequency regime) of driven vortex matter in YBa$_2$Cu$_3$O$_{7-x}$ with elongated strong-pinning sites (c-axis aligned, self-assembled BaZrO$_3$ nanorods) are used to demonstrate that the effective-mass angular scaling takes place only in intrinsic physica…
We use time-domain thermoreflectance to show that interface thermal conductance, G, is proportional to the thermodynamic work of adhesion between gold and water, WSL, for a series of five alkane-thiol monolayers at the gold-water interface. WSL is a measure of the bond strength across the solid-liquid interface. Diffe…
The electron-phonon interaction in electron-doped single-layer MoS${}_{2}$ is investigated using first-principles calculations. The electron-phonon coupling is found to be very weak at low doping levels. It then grows rapidly to a maximum of $\ensuremath{\lambda}\ensuremath{\approx}1.7$, after which it begins to decre…
We analyze in detail the error that arises from the linearization in linearized augmented-plane-wave (LAPW) basis functions around predetermined energies $E_l$ and show that it can lead to undesirable dependences of the calculated results on method-inherent parameters such as energy parameters $E_l$ and muffin-tin sph…