Heat transport of electron-doped Cobaltates

Within the t-J model, the heat transport of electron-doped cobaltates is studied based on the fermion-spin theory. It is shown that the temperature dependent thermal conductivity is characterized by the low temperature peak located at a finite temperature. The thermal conductivity increases monotonously with increasing temperature at low temperatures T $<$ 0.1$J$, and then decreases with increasing temperature for higher temperatures T $>$ 0.1$J$, in qualitative agreement with experimental result observed from Na$_{x}$CoO$_{2}$ .Comment: 4 pages, 1 fig, corrected typos, accepted for publication in Commun. Theor. Phy

Kinetic energy driven superconductivity in the electron doped cobaltate Nax_{x}CoO2⋅y_{2}\cdot yH2_{2}O

Within the charge-spin separation fermion-spin theory, we have shown that the mechanism of superconductivity in the electron doped cobaltate Na$_{x}$CoO$_{2}\cdot y$H$_{2}$O is ascribed to its kinetic energy. The dressed fermions interact occurring directly through the kinetic energy by exchanging magnetic excitations. This interaction leads to a net attractive force between dressed fermions, then the electron Cooper pairs originating from the dressed fermion pairing state are due to the charge-spin recombination, and their condensation reveals the superconducting ground state. The superconducting transition temperature is identical to the dressed fermion pair transition temperature, and is suppressed to a lower temperature due to the strong magnetic frustration. The optimal superconducting transition temperature occurs in the electron doping concentration $\delta\approx 0.29$, and then decreases for both underdoped and overdoped regimes, in qualitative agreement with the experimental results.Comment: 6 pages, 2 figs, corrected typos, accepted for publication in Commun. Theor. Phy

[μ-4-Benzoyl-1-(1-oxido-2-naphthyl­carbon­yl)thio­semicarbazidato(4−)]bis­[pyridine­copper(II)]

In the title dinuclear complex, [Cu2(C19H11N3O3S)(C5H5N)2], the two CuII centers have different coordination environments, viz. N2OS and N2O2, each exhibiting a distorted square-planar geometry. π–π inter­actions between the aromatic rings of neighbouring complexes [centroid–centroid distance = 3.856 (5) Å] link pairs of mol­ecules into centrosymmetric dimers, which are further packed into stacks along the b axis with relatively short Cu⋯Cu separations of 3.482 (1) Å. Weak inter­molecular C—H⋯N hydrogen bonds help to consolidate the crystal packing

Bis[μ-N′-acetyl-1-oxidonaphthalene-2-carbohydrazidato(3−)]tetra­pyridine­tricopper(II)

There are two half-mol­ecules in the asymmetric unit of the title compound, [Cu3(C13H9N2O3)2(C5H5N)4], and crystallographic inversion symmetry completes each trinuclear mol­ecule. In both mol­ecules, the central Cu atom (site symmetry ) adopts a distorted trans-CuO2N4 octa­hedral geometry, arising from its coordination by two N,O-bidentate aroylhydrazine ligands and two pyridine mol­ecules. The peripheral Cu atoms adopt trans-CuN2O2 square-planar coordinations arising from an N,O,O-tri­dentate ligand (that also bonds to the central Cu atom) and a pyridine mol­ecule

Preparation and characterization of solid lipid nanoparticles loaded with frankincense and myrrh oil

The aim of the present study was to prepare solid lipid nanoparticles (SLNs) for the oral delivery of frankincense and myrrh essential oils (FMO). Aqueous dispersions of SLNs were successfully prepared by a high-pressure homogenization method using Compritol 888 ATO as the solid lipid and soybean lecithin and Tween 80 as the surfactants. The properties of the SLNs such as particle size, zeta potential (ZP), and drug encapsulation efficiency (EE) were investigated. The morphology of SLNs was observed by transmission electron microscopy (TEM). The crystallinity of the formulation was analyzed by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). In addition, drug evaporation release and antitumor activity were also studied. Round SLNs with a mean size of 113.3 ± 3.6 nm, a ZP of −16.8 ± 0.4 mV, and an EE of 80.60% ± 1.11% were obtained. DSC and XRD measurements revealed that less ordered structures were formed in the inner cores of the SLN particles. Evaporation loss of the active components in FMO could be reduced in the SLNs. Furthermore, the SLN formulation increased the antitumor efficacy of FMO in H22-bearing Kunming mice. Hence, the presented SLNs can be used as drug carriers for hydrophobic oil drugs extracted from traditional Chinese medicines

7-(1,3-Dioxolan-2-ylmethyl)-1,3-di­methyl-2,6-dioxo-2,3,6,7-tetra­hydro-1H-purin-9-ium tetra­chloridoferrate(III)

The asymmetric unit of the title compound, (C11H15N4O4)[FeCl4], contains two independent protonated 7-(1,3-dioxolan-2-ylmeth­yl)-3,7-dihydro-1,3-dimethyl-1H-purine-2,6-dione (doxofyllinium) and two tetrahedral tetra­chlorido­ferrate(III) anions. In the doxofyllinium, two disordered methyl­ene C atoms are observed in each dioxolane ring with an occupancy ratio of 0.54 (4):0.46 (4). In the crystal, mol­ecules are connected by N—H⋯O hydrogen bonds and weak C—H⋯O and C—H⋯Cl inter­actions