Oxidation catalysis in air with Cp*Ir: influence of added ligands and reaction conditions on catalytic activity and stability
The systematic evaluation of Ir catalysts generates the highest reported TONs and a safe protocol for air oxidation.
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Theoretical investigations on nonlinear optical and spectroscopic properties of 6-(3,3,4,4,4-pentafluoro-2-hydroxy-1-butenyl)-2,4-pyrimidinedione: An efficient NLO material
In this study, quantum chemical calculations of geometric parameters, conformational, natural bond orbital (NBO) and nonlinear optical (NLO) properties, vibrational frequencies, 1 H and 13 C NMR chemical shifts of the title molecule [C 9 H 7 F 5 N 2 O 3 ] in the ground state have been calculated with the help of Densi…
Conditions for electronic reconstruction at stoichiometric polar/polar interfaces
Relying on first principles simulations of ZnO(0 0 0 1)/MgO(1 1 1), MgO(1 1 1)/CaO(1 1 1) and AlN(0 0 0 1)/GaN(0 0 0 1) interfaces and examples taken from the literature, we discuss under which conditions stoichiometric polar/polar interfaces may display an electronic reconstruction. We point out the role of the three…
Preparation of Lysine-Coated Magnetic Fe2O3Nanoparticles and Influence on Viability of A549 Lung Cancer Cells
OBJECTIVE: To explore the effect of lysine-coated oxide magnetic nanoparticles (Lys@MNPs) on viability and apoptosis of A549 lung cancer cells. METHODS: Transmission electron microscopy (TEM), vibrating sample magnetometer (VSM) and Zeta potentiometric analyzer were employed to characterize Lys@MNPs. Then Lys@MNPs and…
Synthesis of thermo-responsive polymer–protein conjugates through disulfide bonding
A novel alternative was developed for the synthesis of polymer–protein conjugates with a controllable number of polymer chains. Human serum albumin (HSA), as a model protein, was grafted by poly(N-isopropyl-acrylamide) (PNIPAM) using N-succinimidyl-3-(2-pyridyldithiol) propionate as a coupling agent at room temperatur…
Tunable multicolor and white‐light upconversion luminescence in Yb3+/Tm3+/Ho3+ tri‐doped NaYF4 micro‐crystals
NaYF4 micro-crystals with various concentrations of Yb(3+) /Tm(3+) /Ho(3+) were prepared successfully via a simple and reproducible hydrothermal route using EDTA as the chelating agent. Their phase structure and surface morphology were studied using powder X-ray diffraction (XRD) and scanning electron microscopy (SEM)…
Ultra-long zinc oxide nanowires and boron doping based on ionic liquid assisted thermal chemical vapor deposition growth
Ionic liquid assisted growth of ultra-long ZnO nanowires from thermal chemical vapor deposition and the incorporation of dopants into the ZnO lattice have been investigated. We find that decomposed components of the ionic liquid at higher temperatures facilitate ultra-long vapor-liquid-solid ZnO nanowires that exhibit…
NANOMATRIX STRUCTURE FORMED BY GRAFT COPOLYMERIZATION OF STYRENE ONTO FRESH NATURAL RUBBER
ABSTRACT Fresh NR was adopted to prepare rubber with a nanomatrix structure. The nanomatrix structure was formed by graft-copolymerization of styrene onto deproteinized fresh NR (fresh DPNR) in the latex stage using tert-butyl hydroperoxide/tetraethylenepentamine as an initiator. Graft-copolymer consisting of fresh DP…
Understanding the Effects of Ion-Exchange in Titanosilicate ETS-10: A Joint Theoretical and Experimental Study
Density functional theory (DFT) calculations within the gradient-corrected approximation (GGA) were carried out on two models of Engelhard titanosilicate (ETS-10) with the aim to elucidate the effect of ion exchange on the structural and electronic properties of the Ti–O–Ti quantum wire. The partial and full exchange…
Phase Transformation Behavior of a Pyrochlore‐Type CeO 2 –ZrO 2 Binary Compound
The phase transformation behavior of the superlattice structure of a CeO 2 – ZrO 2 pyrochlore‐type binary compound ( CP ) was investigated so as to better understand how to improve the thermal stability of such a system. CP was synthesized through high‐temperature reduction of a conventional CeO 2 – ZrO 2 solid soluti…
Aulacoseira veraluciae sp. nov. (Coscinodiscophyceae, Aulacoseiraceae): a common freshwater diatom from Brazil
Examination of samples from different aquatic environments from Brazil revealed the presence of a new Aulacoseira species. Aulacoseira veraluciae Tremarin, Torgan & T. Ludwig is described and illustrated with light and scanning electron microscopy, and its morphology compared with that of similar species, such as A. m…
Flexible Sensors Based on Radiation-Induced Diffusion of Ag in Chalcogenide Glass
In this paper, previous work on chalcogenide-glass (ChG)-based radiation sensors is extended to include the effects of mechanical strain and temperature stress on sensors formed on a flexible polymer substrate. We demonstrate the feasibility of producing inexpensive flexible radiation sensors, which utilize radiation-…
Graphene nanoribbon field-effect transistor at high bias
Combination of high-mean free path and scaling ability makes graphene nanoribbon (GNR) attractive for application of field-effect transistors and subject of intense research. Here, we study its behaviour at high bias near and after electrical breakdown. Theoretical modelling, Monte Carlo simulation, and experimental a…
Gels, xerogels and films of polynuclear iron( ii )–aminotriazole spin-crossover polymeric complexes
The prominent polynuclear spin-crossover complex [Fe(NH2trz)3](2ns)2 (polymer) (NH2trz = 4-amino-1,2,4-triazole, 2ns− = 2-naphthalenesulfonate) as obtained from synthesis exists in a metastable state characterized by a columnar hexagonal packing (Colh) of polynuclear rigid–rod complexes, and shows considerable fluctua…
Uptake of liquid from wet surfaces by the brush-tipped proboscis of a butterfly
This study investigated the effect of the brush-tipped proboscis of the Asian comma (Polygonia c-aureum) on wet-surface feeding. The tip region of this proboscis was observed, especially two microstructures; the intake slits through which liquid passes into the proboscis and the brush-like sensilla styloconica. The se…
∼2 μm emission properties and non-radiative processes of Tm3+ in germanate glass
In this paper, 80GeO2-8Ga2O3-10BaO-2Nb2O5-6PbO (in mol%) glass samples with different Tm2O3 concentrations (0, 0.5, 0.75, 1, 1.25, and 1.5 mol. %) were prepared by traditional melt-quenching method. According to the measurement of thermal properties of the host glass, the glass transition temperature is 596.7 °C and n…
One‐Step Synthesis and Polyacrylic Acid Functionalization of Multifunctional Europium‐Doped NaGdF4 Nanoparticles with Selected Size for Optical and MRI Imaging
Abstract Multifunctional Eu:NaGdF4 nanospheres functionalized with polyacrylic acid (PAA) polymer have been prepared for the first time by a simple one‐pot method that consists of a homogeneous precipitation reaction at 120 °C. The size of the nanospheres, which were polycrystalline and crystallized into a hexagonal s…
Enhancement of Initial Growth of ZnO Films on Layer-Structured Bi2Te3 by Atomic Layer Deposition
The initial growth behavior of ZnO films by atomic layer deposition (ALD) on layer-structured Bi 2 Te 3 was investigated. Despite the lack of adsorption sites on the basal plane of Bi 2 Te 3, negligible incubation in the ALD of ZnO on Bi 2 Te 3 was found in the temperature range from 100 to 160 °C, and even the enhanc…
Influence of expanded graphite (EG) and graphene oxide (GO) on physical properties of PET based nanocomposites
Abstract This work is the continuation and refinement of already published communications based on PET/EG nanocomposites prepared by in situ polymerization 1, 2 . In this study, nanocomposites based on poly(ethylene terephthalate) with expanded graphite were compared to those with functionalized graphite sheets (GO).…
Magnetic control of valley and spin degrees of freedom via magnetotransport inn-type monolayer MoS2
We study the quantum magnetotransport properties at low temperature for n-type monolayer MoS2 under a perpendicular magnetic field within the linear response theory. By using Kubo formula, it is predicted that the valley- and spin-resolved Hall conductance obeys the same rule as that for conventional fermions. However…