Materials Literature
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Micro-Raman and micro-transmission imaging experiments have been done on epitaxial graphene grown on the C- and Si-faces of on-axis 6H-SiC substrates. On the C-face it is shown that the SiC sublimation process results in the growth of long and isolated graphene ribbons (up to 600 μm) that are strain-relaxed and lightl…
In vitro tissue engineering for fabrication of small diameter vascular grafts probably undergoes a sequence of events similar to the in vivo angiogenesis process. In both cases endothelial cells (ECs) play the crucial role in generating a non-thrombogenic vessel lumen and stabilization of ECs in the lumen of new vesse…
A cellulose-based adsorbent was prepared from a cellulose–ionic liquid solution by emulsification followed by modification with glutamic acid for Cr(III) adsorption from aqueous solution. Response surface methodology (RSM) coupled with central composite design (CCD) was employed to optimize the adsorption process to e…
Three-dimensional phase-field simulations are employed to investigate rod-type eutectic growth morphologies in confined geometry. Distinct steady-state solutions are found to depend on this confinement effect with the rod array basis vectors and their included angle (α) changing to accommodate the geometrical constrai…
Superbroadband near-infrared (NIR) emission covering 1250 to 1680 nm wavelength has been obtained in praseodymium (Pr(3+)) singly doped bismuth gallate glasses. The emission originates from the (1)G(4)→(3)H(5) and (1)D(2)→(1)G(4) transitions at 1330 and 1490 nm wavelengths, respectively, and is due to the extremely lo…
We investigated how pulsed laser annealing can be applied to process thin films of colloidal nanocrystals (NCs) into interconnected nanostructures. We illustrate the relationship between incident laser fluence and changes in morphology of PbSe NC films relative to bulk-like PbSe films. We found that laser pulse fluenc…
We present a simple model for simulating the response of a superelastic shape memory alloy wire based on the thermodynamics of irreversible processes, which can simulate the full thermomechanical response including internal hysteresis loops, at different temperatures, with minimal data input. The key idea is to separa…
Resonant interaction of laser pulses with plasmons is used to identify vibrations associated with isolated spheres and pairs of contacting spheres in a system of gold nanoparticles. The optical pulses generate coherent mechanical oscillations of both monomers and dimers in the 5-150 GHz range, the amplitudes of which…
In this work an electric-field gradient and magnetic hyperfine field study of the multiferroic AgCrO${}_{2}$ triangular spin lattice is presented. Perturbed angular correlation measurements at different temperatures, revealed the coexistence of two electric-field gradients, i.e., two distinct local environments at tem…
We describe the novel synthesis of a bis(hydrazone)iron(II) complex in protonated [Fe(Hpbph)(2)]Cl(2) (1) and deprotonated [Fe(pbph)(2)] (2) forms and several hydrogen-bonded proton-transfer (HBPT) assemblies having different dimensionalities of hydrogen-bonded network structures, [Fe(Hpbph)(2)](CA)·2CH(3)OH (3), [Fe(…
We have performed density functional theory calculations to study the effect of Cr in the formation of He-vacancy (He${}_{n}$V${}_{m}$) clusters in a dilute Fe-Cr system. We find a significant repulsive interaction between Cr and He at neighboring tetrahedral sites. The octahedral He close to Cr becomes unstable falli…
We reported a noticeable methodology for functionalization of carboxylated multi-walled carbon nanotubes (MWNT-COOH) using 1, 4-phenylendiamine and the latter modification by phenylisocyanate and phenylisothiocyanate. All products were characterized by FT-IR and Raman spectroscopy, SEM, elemental analysis and 1H NMR s…
Metamaterials are, in general, characterized by the bianisotropic response that relates the displacement vector D and the magnetic induction B to the electric and magnetic fields E and H via the permittivity, permeability and magnetoelectric dyadics, respectively, ↔ ε, ↔ µ and ↔ γ (= -↔ δ T ).For the first time, we de…
We introduce a general implementation of the recently proposed homogenization theory [Tsukerman, J. Opt. Soc. Am. B 28, 577 (2011)] allowing one to retrieve all 36 linear constitutive parameters of any 3D metamaterial with parallelepipedal unit cells. The effective parameters are defined directly as linear relations b…
An advantage of using single-walled carbon nanotubes (SWCNTs) as building blocks in tailoring materials functionality is that many unique properties of SWCNTs can be captured. We present an ab initio study of covalent assembly of SWCNTs into a variety of functional carbon superarchitectures, including two-dimensional…
In order to mimic the effect that unwanted fluorescent species have on the process of excimer formation between pyrene labels covalently attached onto macromolecules, the steady-state fluorescence spectra and time-resolved fluorescence decays were acquired for mixtures of pyrene monolabeled and doubly end-labeled 2K p…
Electrodeposition is a low temperature and low cost growth method of high quality nanostructured active materials for optoelectronic devices. We report the electrochemical preparation of ZnO nanorod/nanowire arrays on n-Si(1 1 1) and p-Si(1 1 1). The effects of thermal annealing and type of substrates on the optical p…
A possible realization of Hall conductivity, quantized at odd integer factors of ${e}^{2}/h$ for graphene's honeycomb lattice is proposed. I argue that, in the presence of uniform real and pseudo-magnetic fields, the valley degeneracy from the higher Landau levels can be removed. A pseudo-magnetic field may arise from…
The feasibility of all-telluride integrated optics devices based on waveguides presenting a single-mode behavior in the spectral range (10-20 μm) is demonstrated. These waveguides are constituted of a several micrometer thick Te(82)Ge(18) film deposited onto a Te(75)Ge(15)Ga(10) bulk glass substrate by thermal coevapo…
Abstract Optical and electrochemical properties of regiosymmetric and soluble alkylenedioxyselenophene‐based electrochromic polymers, namely poly(3,3‐dibutyl‐3,4‐dihydro‐2H‐selenopheno[3,4‐b][1,4]dioxephine) (PProDOS‐C 4 ), poly(3,3‐dihexyl‐3,4‐dihydro‐2H‐selenopheno[3,4‐b][1,4]dioxephine) (PProDOS‐C 6 ), and poly(3,3…