Adsorption of natural surfactants present in sea waters at surfaces of minerals: contact angle measurements
?*
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Low Temperature Processing and Properties of Porous Frit-Bonded SiC Ceramics
Porous frit-bonded SiC ceramics were successfully prepared at a temperature as low as 800 o C from SiC, frit, and microbeads (glass or polymer). The effects of SiC starting particle size and microbead addition on microstructure, porosity, and flexural strength were investigated. The addition of hollow glass microbead…
Microphase Separation in Sulfonated Block Copolymers Studied by Monte Carlo Simulations
The underpinnings of microphase separation in symmetric poly(styrenesulfonate- block -methylbutylene) (PSS−PMB) copolymer melts were examined by Monte Carlo lattice simulations. The main challenge is understanding the effect of ion pairs in the PSS block on thermodynamics. We assume that experimentally determined Flor…
Synthesis of HCN Polymer from Thermal Decomposition of Formamide
Prolonged heating of formamide (HCONH2) at 185°C or 220°C produces a black insoluble product. The FT-IR spectroscopy and the X-ray photoelectron spectroscopy (XPS) suggest that the product has the chemical structure of a polymer of hydrocyanic acid: (HCN)x. The pyrolysis of (HCN)x prepared from formamide produces a la…
Spin-Hamiltonian parameters and tetragonal distortion due to the Jahn–Teller effect for Cu2+centres in trigonal Zn(BrO3)·6H2O crystal
The spin-Hamiltonian parameters (g factors g//, g⊥ and hyperfine structure constants 65A// and 65A⊥) for the tetragonal Cu2+ centres in trigonal Zn(BrO3)·6H2O crystal are calculated from the complete diagonalization (of energy matrix) method (CDM) based on the cluster approach. In the CDM, the Zeeman and hyperfine int…
Determination of the Phase Behavior of (LiNH2)c(LiBH4)1−c Quaternary Hydrides through in Situ X-ray Diffraction
Solid hydride materials combining high gravimetric and volumetric hydrogen capacity, rapid hydrogenation and dehydrogenation kinetics, and low operating temperature are highly desirable for hydrogen storage on fuel cell vehicles. Recently, a material of nominal composition Li 3 BN 2 H 8, formed by combining LiNH 2 and…
Nephrogenic Systemic Fibrosis in Rats Treated with Erythropoietin and Intravenous Iron
PURPOSE: To use a rat model for nephrogenic systemic fibrosis (NSF) that was administered high-dose gadodiamide to determine whether the co-administration of erythropoietin (Epo) and intravenous iron potentiated development of skin lesions that are thought to be a marker for the development of NSF. MATERIALS AND METHO…
Thermally Controllable Reflective Characteristics from Rupture and Self-Assembly of Hydrogen Bonds in Cholesteric Liquid Crystals
A cholesteric liquid crystal (Ch-LC) composite, made of a series of cholesteryl esters, a nematic LC, and a hydrogen bond (H-bond) chiral dopant (HCD), was prepared and filled into a planar treated cell. When the cell was heated, the selective reflection of the cell exhibited an unusual blue shift. One of the reasonab…
Atomic scale high-angle annular dark field STEM analysis of the N configuration in dilute nitrides of GaAs
While high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) has been successfully used for the analysis of heavy atoms in a lighter matrix, the detection of light atoms in a heavy matrix remains challenging. In this paper, we show that the combination of first-principles total-energy cal…
Uniform energy and density distribution: diblock copolymers’ functional
We study a nonlocal variational problem arising in diblock copolymers models, whose energy is given by the Cahn–Hilliard functional plus a long-range interaction term. We prove that minimizers develop uniform energy and density distributions, thus justifying partially the highly regular microphase separation observed…
Symmetry-induced nonequilibrium distributions of bright and dark exciton states in single carbon nanotubes
We investigated the magnetic and temperature dependence of the bright and dark exciton luminescence spectra in single carbon nanotubes. We found that the phonon-induced exciton scattering rate from the bright to the dark state is only one order of magnitude larger than the dark exciton recombination rate below 10 K at…
Synthesis and Self-Assembly of Fluorescent Micelles from Poly(ferrocenyldimethylsilane-b-2-vinylpyridine-b-2,5-di(2′-ethylhexyloxy)-1,4-phenylvinylene) Triblock Copolymer
A fluorescent ABC triblock copolymer containing poly(ferrocenyldimethylsilane) (PFS) and poly(2-vinylpyridine) (P2VP) moieties in the segments was synthesized via living anionic polymerization followed by quenching the living chains using a π-conjugated poly(2,5-di(2′-ethylhexyloxy)-1,4-phenylvinylene aldehyde (PDEHPV…
Interfaces within graphene nanoribbons
We study the conductance through two types of graphene nanostructures: nanoribbon junctions in which the width changes from wide to narrow, and curved nanoribbons. In the wide–narrow structures, substantial reflection occurs from the wide–narrow interface, in contrast to the behavior of the much studied electron gas w…
Fabrication and Characterization of (1-x)BiFeO3-xBaTiO3Ceramics Prepared by a Solid State Reaction Method
In this study, BiFe<TEX>$O_3$</TEX>-BaTi<TEX>$O_3$</TEX> ceramics have been fabricated by a solid-state reaction method. The effects of BaTi<TEX>$O_3$</TEX> content in the (1-x)BiFe<TEX>$O_3$</TEX>-xBaTi<TEX>$O_3$</TEX> (x = 0.1, 0.2, 0.25, 0.3, 0.4, 0.5) system on crystal structure and magnetic, dielectric, and ferro…
Optical properties of fibres with aluminophosphosilicate glass cores
The optical properties of fibres with aluminophosphosilicate (APS) glass cores have been studied at Al 2 O 3 and P 2 O 5 concentrations varied independently from 0 to 20%, and the ranges of dopant concentrations that ensure an optical loss level acceptable for the fabrication of active fibres have been established. Th…
Effect of abrasive particle size on abrasive wear of hardfacing alloys
Hardfacing is one of the most useful and economical ways to improve the performance of components submitted to severe wear conditions. This study has been made for the comparison of microstructure and abrasion resistance of hardfacing alloys reinforced with chromium carbides or complex carbides. The hardfacing alloys…
Development of Catalyst Free Carbon Nanotubes from Coal and Waste Plastics
DC‐Arc technique has been used to synthesize carbon nanotubes from super clean coal, chemically cleaned coal, original coal and waste plastics instead of using high purity graphite in the presence of metal catalysts. The results obtained are compared in terms of yield, purity and type of carbon nanotubes produced from…
Phenyl@Rh(I)-Bridged Periodic Mesoporous Organometalsilica with High Catalytic Efficiency in Water-Medium Organic Reactions
A facile approach to prepare phenyl and Rh(I) organometal bridged periodic mesoporous organometalsilica was developed based on surfactant-directed co-condensation of RhCl[PPh 2 (CH 2 ) 2 Si(OEt 3 ) 3 ] 3 and (OEt) 3 SiPhSi(OEt) 3 . The as-prepared Rh(I)-PPh 2 -PMO(Ph) exhibited matchable catalytic efficiency with the…
Immobilization of a Photoswitchable Piperidine Base
The synthesis of a photoswitchable piperidine base, carrying a monochlorosilane anchoring group, and its immobilization on silica gel, mimicking an oxide surface, is reported. Efficient photoswitching between the E and Z isomers of the azobenzene photochrome was demonstrated for the immobilization precursor in solutio…
Synthesis and Physical Properties of Two Chiral Terpyridyl Europium(III) Complexes with Distinct Crystal Polarity
Abstract By utilizing the chiral terpyridyl‐type ligand L(–) [L =“dipineno”‐(4,5:4″,5″)‐fused 2,2′:6′,2″‐terpyridine or 2,6‐bis(7,7‐dimethyl‐5,6,7,8‐tetrahydro‐6,8‐methanoisoquinolin‐3‐yl)pyridine], two novel Eu III complexes with the formula [Eu(tta) 3 L](C 3 H 6 O) · 0.5(H 2 O) ( 1 ) and [Eu(bta) 3 (L)](C 3 H 6 O)(…