Materials Literature
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Calculations based on the first-principles pseudopotential plane-wave method and density functional theory are performed to investigate the electronic properties of graphene, bilayer graphene, multilayer graphene, and graphite. From an analysis of the electronic band structure close to the Fermi level, we have quantif…
The structural and electrical properties of Mn-based colossal magnetoresistance (CMR) thin films with controlled tolerance factor and Mn ion valance ratio were studied using crystal structure and chemical bonding character analyses. La0.7Sr0.3MnO3, La0.7Ba0.3MnO3, and La0.82Ba0.18MnO3 thin films with different content…
Modification of different zirconium propoxide precursors with H(2)dea was investigated by characterization of the isolated modified species. Upon modification of zirconium n-propoxide and [Zr(O(n)Pr)(O(i)Pr)(3)((i)PrOH)](2) with (1/2) a mol equivalent of H(2)dea the complexes [Zr(2)(O(n)Pr)(6)(OCH(2)CH(2))(2)NH](2) (1…
A phosphorus-containing flame retardant (2,5-dihydroxyphenyl)diphenyl phosphine oxide (HPO) was characterized by a differential scanning calorimeter (DSC), thermogravimetric analysis (TGA), elemental analysis, and nuclear magnetic resonance ( 1 H NMR and 31 P NMR). Using a static analytical method, the solubilities of…
We have performed magnetization and $^{31}$P-NMR measurements on the itinerant ferromagnet LaCoPO (Curie temperature $T_{\rm Curie}\sim 44$ K) with a layered structure in order to investigate spin dynamics in the paramagnetic state. The linear scaling between the Knight shift $K$ at the P site and the bulk susceptibil…
Variation of magnetocaloric (MC) effects has been systematically investigated for colossal magnetoresistive (CMR) manganites R 0.6 Sr 0.4 MnO 3 ( R = La–Gd). As the one-electron bandwidth is reduced, the temperature profile of MC effect, i.e. field-induced entropy change, exhibits a steeper drop below the ferromagneti…
This laboratory has initiated compelling research into silicon quantum dot (Si QD) solids in order to utilize their synergetic benefits with quantum dot solids through fabrication of Si QD thin films. The issues of oxidation concerning the Si QD thin films were confirmed using Fourier transform infrared spectroscopy (…
The morphology and structure of ultrananocrystalline diamond grown on Si substrate by chemical vapor deposition are systematically studied by varying the methane concentration in the Ar/H2/CH4 precursor mixture. The films, analyzed by field-emission-gun scanning electron microscopy (FEG-SEM), showed a nanocrystallite…
There has been a considerable amount of interest in negative thermal expansion (NTE) phases which are of importance, for example, in the manufacture of low or zero expansion composite materials. Cubic gamma-ZrMo(2)O(8) is of importance since it shows smooth NTE (alpha = -8 x 10(-6) K(-1) at 100 K) over a wide temperat…
Single crystals of the previously unknown potassium calcium silicate K2Ca4Si8O21 (1) have been grown from a nonstochiometric melt as well as using a KCl flux. The compound is triclinic with the following basic crystallographic data: space group P, a = 6.8052(3) A, b = 7.1049(3) A, c = 11.2132(5) A, alpha = 96.680(4)de…
Several bimetallic mixed oxides−silica nanocomposites were prepared using SBA-15 as a support and suitable metal-containing reagents. The oxide precursors were obtained by reacting two metal alkoxides, namely, titanium(IV) isopropoxide [Ti(O i Pr) 4 ], zirconium propoxide [Zr(OPr) 4 ], and aluminum isopropoxide [Al(O…
The generation of space charges in a silicone elastomer has been characterized under dc voltage as a function of the temperature using the laser induced pressure pulse (LIPP) method. The analysis of the LIPP spectra has been detailed thanks to acoustical considerations, taking into account the reflection, attenuation…
The synthesis, structural characterization, photoluminescence, and excited state absorption properties of a series of platinum(II) terpyridyl complexes bearing a bipyridyl acetylide subunit are presented. The [(t)Bu(3)tpyPtC identical withCbpy](+) (1) complex displays a broad and structureless emission profile at room…
The aim of the investigation was to assess the influence of commercial and carboxylated multi-walled carbon nanotubes (MWCNTs) on conidia of the entomopathogenic fungus Paecilomyces fumosoroseus. The commercial MWCNTs had an external diameter of about 40-60 nm, a length of 300-600 nm, a specific density of 140 to 300…
We report the design and synthesis of annulated thiepins designed to undergo bent-to-planar transformation driven by aromatization under electrochemical control. Thiepins are conjugated seven-membered ring systems with a thioether in the macrocycle. We synthesized thermally stable thiepins that are electropolymerizabl…
We report muon spin relaxation $(\ensuremath{\mu}\text{SR})$ and magnetic-susceptibility measurements on $\text{Cu}(\text{Cl},\text{Br})\text{La}{(\text{Nb},\text{Ta})}_{2}{\text{O}}_{7}$, which demonstrate: (a) the absence of static magnetism in $(\text{CuCl}){\text{LaNb}}_{2}{\text{O}}_{7}$ down to 15 mK confirming…
Charge separation has been investigated at Pd−porphyrin (Pd−P)/TiO 2 interfaces by surface photovoltage spectroscopy in the Kelvin-probe arrangement. Ultrathin nanoporous TiO 2 layers were covered with Pd−P molecules from highly diluted organic solution starting from the submonolayer range. Mechanisms of charge separa…
Abstract In this article, macromolecular charring agent linear novolac (NA) was served as a synergist with nitrogen‐phosphorous flame retardant melamine polyphosphate (MPP) for the flame‐resistance of wollastonite (WT) filled polyamide 66 (PA66). The investigations showed that MPP/NA system possessed obvious synergist…
The development of well-controlled synthetic schemes for growing polymer brushes directly from surfaces has recently enabled very high polymer grafting densities to be explored. Here, we report on the structure of polystyrene brushes as a function of molecular weight. The brushes were prepared by atom transfer radical…
The possible quantum Hall ferromagnet at a filling factor $\nu =0$ is investigated for the zero-energy (N=0) Landau level of the two dimensional massless Dirac fermions in $\alpha$-(BEDT-TTF)$_2$I$_3$ under pressure with tilted cones and a twofold valley degeneracy resulting from time-reversal symmetry. In the case of…