Materials Literature
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In this Letter, we report gate-tunable X-ray photoelectron emission from back-gated graphene transistors. The back-gated transistor geometry allows us to study photoemission from graphene layer and the dielectric substrate at various gate voltages. Application of gate voltage electrostatically dopes graphene and shift…
Nitrogen-incorporated ultrananocrystalline diamond (N-UNCD) and multi-layer-graphene-like hybrid carbon films have been synthesized by microwave plasma enhanced chemical vapor deposition (MPECVD) on oxidized silicon which is pre-seeded with diamond nanoparticles. MPECVD of N-UNCD on nanodiamond seeds produces a base l…
We have studied the ethyl acetate fraction of the methanolic extract of the root barks of Calotropis procera (Asclepiadaceae) from Egypt. Bioassay-directed fractionation and final purification of the extract resulted in the identification of a new cardenolide glycoside named proceraside A (1) together with two known c…
XRD1 was the first X-ray diffraction beamline to be built at the LNLS and after approximately 12 years of operation it was substantially updated to improve beam stability, increase the reliability of the monochromator movement as well as provide an experimental hutch that would meet the demands of users. The improveme…
Magnetic materials with large coercive force and high squareness ratio are currently developing to meet an industrial demand. Since a ferromagnetic material has hysteresis characteristics, it is hard to demagnetize a ferromagnetic material precisely. In this paper, we describe deperm processes and conduct an analysis…
Unsymmetrical vesicular membranes were prepared from a binary mixture of the A3B-type and the AB-type host polypeptides, which were composed of the hydrophilic block (A) and the hydrophobic helical block (B) but with a different helix sense between the two host polypeptides. TEM and DLS revealed the formation of vesic…
This chapter summarizes several techniques that have been used in the characterization of cellulose nanocomposites, in particular cellulose nanomaterials (CNs) dispersion, distribution, and orientation within polymer matrixes. The microscopy techniques described are optical microscopy, scanning electron microscopy, tr…
Ni 0.6 Zn 0.4 Fe₂O₄ prepared using solid state reaction and sol-gel methods were compared for their structural and magnetic properties. Due to the much higher annealing temperature used in solid state reaction, the crystalline size was much larger than that of the nanoparticles prepared by sol-gel. The saturation magn…
Current chemotherapeutic strategies for tumors of the CNS are largely ineffective. This is due, in part, to the lack of robust drug delivery systems. The blood-brain barrier hinders the passage of systemically delivered therapeutics, and the brain extracellular matrix limits the distribution and longevity of locally d…
Abstract A family of di‐ and tetratopic redox‐active ligands designed to generate discrete self‐assembled metallacages is described, including UV/Vis spectrometry and cyclic voltammetry studies, X‐ray diffraction on single crystals, and DFT calculations. A significant degree of conjugation between the π‐donating bis(p…
The purpose of this work is to identify the influence of zinc bath temperature on the morphology, texture and corrosion behavior of hot-dip galvanized coatings. Hot-dip galvanized samples were prepared at temperature in the range of 450-480 °C in steps of 10 °C, which is the conventional galvanizing temperature range…
We study crystal nucleation in metallic niobium supercooled liquid by ab initio molecular dynamics simulations. Using various structural analysis methods including bond orientational order analysis, a scheme of crystallization process is revealed. Extended structured regions of high bond orientational order are sponta…
Here we present a study on the presence of physisorbed water on the surface of aligned carbon nanotubes (CNTs) in ambient conditions, where the wet CNT array mass can be more than 200% larger than that of dry CNTs, and modeling indicates that a water layer >5 nm thick can be present on the outer CNT surface. The exper…
A facile and one pot synthesis of silver nanoparticles with narrow size distributions using silver nitrate and a copolymer 1 from N-isopropylacrylamide (NIPAM) and mono-(1H-triazolylmethyl)-2-methylacryl-β-cyclodextrin acting as reductant and stabilizer without using any additional reducing agent is reported. The redu…
Mechanism-based inhibitors are relatively chemically inert compounds that become activated when processed by their target enzyme, leading to covalent enzyme inactivation. Fluorine substitution confers a number of properties that are beneficial to the chemistry of such inhibitors and to their potential use as pharmaceu…
The interfacial spin state of the multiferroic heterostructure PbZr0.52Ti0.48O3/La0.67Sr0.33MnO3 and its dependence on ferroelectric polarization is investigated with magnetic second-harmonic generation at 78 K. The spin alignment of Mn ions in the first unit cell layer at the heterointerface can be tuned from ferroma…
By gradually adjusting the proportion of tetraphenylethene (TPE) and phosphine oxide (PO), the series of n-type, ambipolar, and p-type aggregation-induced emission (AIE) luminogens ( E, Z )-((1,2-diphenylethene-1,2-diyl)bis(4,1-phenylene))bis(diphenylphosphine oxide) (TPEDPO), diphenyl(4-(1,2,2-triphenylvinyl)phenyl)p…
Magnetic, structural, and magnetocaloric properties have been investigated for a solid-solution system, ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}{\mathrm{V}}_{2}{\mathrm{O}}_{4}$ ($0.0\ensuremath{\le}x\ensuremath{\le}1.0$) with a spinel structure. As orbital-active ${\mathrm{Fe}}^{2+}$ ions are partially subs…
Porous and nonporous 3D heterobimetallic coordination polymers based on the 1,4-di(pyridin-4-yl)benzene ligand (dpb), [Fe(dpb){Ag(CN)2}{Ag2(CN)3}]·nSolv (1·nSolv; nSolv = DMF·EtOH, 2DMF·MeCN) and [Fe(dpb)2{Ag(CN)2}2] (2), have been synthesized by diffusion technique, respectively. Single-crystal X-ray analysis shows t…
The refractive index of colloidal particles formed by nanodiamond in water (average diameters of 106, 122, and 854 nm) was measured by Fabry-Perot interferometry as n = 1.78, 1.74, and 1.79, respectively, which suggests the molar ratio of water to carbon within these particles of 0.16:1, and the effective thickness of…