Materials Literature
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In this work we analyze numerically and experimentally new active waveguides based on a bilayer structure composed by a passive polymer and an active poly(mehtyl methacrylate) (PMMA) film doped with CdSe colloidal quantum dots (QDs), namely a nancomposite. In a first bilayer structure a planar PMMA layer is deposited…
Although molecular metals have been known for decades, their insolubility, low vapor pressure, and synthesis routes have prevented them from being integrated into electronic devices. We have prepared stable colloidal solutions of the organic metal TTF-TCNQ that overcome such difficulties. The solutions contain well-di…
The transport properties of manganite thin films characterized by a weak-localization transition have been studied. Detailed voltage noise measurements show a specific $1/f$ noise spectrum below the transition temperature. A theoretical interpretation in terms of universal conductance fluctuations explains the nature…
We report a detailed calorimetric study on single crystals of the 5$d$-transition metal pnictide SrPt${}_{2}$As${}_{2}$ with a superconducting critical temperature ${T}_{c}\ensuremath{\sim}5$ K. The peculiar field dependence of the electronic specific heat coefficient $\ensuremath{\gamma}$ can be decomposed into two l…
We report on the temperature mapping around a resistively heated gold microwire. The temperature is determined by measuring the thermal-induced distortion of an incident optical wavefront crossing the system. The optical technique we introduce herein allows, in addition to 3-dimensional temperature measurements, a ret…
Five-fold symmetric substituted corannulene derivatives that display liquid-crystalline behavior and organogelation properties were prepared by coupling of N-azidoethyl long-chain fatty acid amides to sym-pentabutynyl corannulenes via dipolar cycloaddition chemistry.
ABSTRACT Five polypropylene (PP) homopolymers were selected and their molecular structure was thoroughly characterized to determine the effect of molecular architecture on their annealing behavior and on the ultimate stiffness achieved by heat treatment. Molecular mass and its distribution were characterized by rheolo…
Since ITER will be a full metallic wall machine, scattered photons from the strong emission in the divertor may distort the emission from the scrape-off layer (SOL). The influence of stray light for visible spectroscopy of H α and Be I emissions in ITER was investigated with a ray-tracing simulation. It was found that…
Domestic and international laws, regulations, policies, and government and private-party governance programs are being carefully reviewed and revised to enhance their utility to nurture the commercialization of nanoscale materials. Whether existing laws are adequate to address potential risks from nanoscale materials…
We demonstrate that the intrinsic electron doping of monolayer epitaxial graphene on SiC(0001) can be tuned in a controlled fashion to holes via molecular doping with the fluorinated fullerene C60F48. In situ angle-resolved photoemission is used to measure an upward shift of (0.6 ± 0.05) eV in the Dirac point from −0.…
Modern synchrotron beamlines offer instrumentation of unprecedented quality, which in turn encourages increasingly marginal experiments, and for these, as much as ever, the ultimate success of data collection depends on the experience, but especially the care, of the experimenter. A representative set of difficult cas…
Dislocation nucleation is fundamental to mechanical properties of nanocrystalline (nc) materials. At grain size less than 100 nm, dislocations have been observed to nucleate predominantly from grain boundaries. Here, we report a process of dislocation generation originated hierarchically from different microstructural…
Carbon nanotubes (CNT) in their cellular like micro-structure have presented an excellent mechanical energy absorption capacity. Although, several efforts have been progressed to modify the CNT structure for further enhancing their energy absorption capacity but yet no report has revealed the effect of magnetic field…
The magnetic properties of hexagonal Ba(Ti1−xMnx)O3 (x = 1/9, 1/6) samples specifically treated under different thermal conditions are investigated. A magnetic transformation from paramagnetism of as-grown samples to weak ferromagnetism of post-annealed samples is observed at room temperature. Associated with the stru…
Six new platinum(II) chloride complexes 1-6 containing a 6-[9,9-di(2-ethylhexyl)-7-R-9H-fluoren-2-yl]-2,2'-bipyridine (R = NO2, CHO, benzothiazol-2-yl (BTZ), n-Bu, carbazol-9-yl (CBZ), NPh2) ligand were synthesized and characterized. The influence of the electron-donating or electron-withdrawing substituent at the 7-p…
Abstract The mass spectrometric characterisation of bismuth–oxido clusters is described together with tandem mass spectrometric experiments aimed at investigating their gas‐phase chemistry. Clusters with different ligand shells (nitrate, salicylates, and methacrylate) and different sizes ({Bi 6 O 8 }, {Bi 22 O 26 }, a…
Nonlinear refraction and nonlinear absorption in stoichiometric colloidal CuInS2 quantum dots, with absorption edge tuned up to the visible spectral region, were investigated. The nonlinear optical response of the quantum dots was measured in a wide range of wavelengths (700–1600 nm) using the Z-scan technique. The me…
Abstract The charge density in the high density ( ρ = 1.912 g · cm –3 ) organic ferroelectric, croconic acid, was determined from low temperature (20 K) X‐ray diffraction data, and DFT theoretical calculations. The high density was associated with strong intermolecular interaction energies. The spontaneous polarizatio…
Abstract The cooperative binding of N 2 by late transition and main‐group metals is a promising strategy for N–N bond weakening and activation. We report the use of activated Rieke magnesium for the reduction of iron and cobalt complexes supported by bulky β‐diketiminate ligands. The binding of N 2 is accompanied by t…
We report on the fabrication and electrical characteristics of the first SrTiO3/GdTiO3 (STO/GTO) heterostructure field-effect transistors (HFETs). The high two-dimensional electron gas (2DEG) density of 3 × 1014 cm−2 formed due to the polar discontinuity at the STO/GTO interface was used as a channel to create inverte…