Preparation of Layered Double Hydroxides
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Unique gold sponges: biopolymer-assisted hydrothermal synthesis and potential application as surface-enhanced Raman scattering substrates
In this paper we describe a biopolymer-assisted hydrothermal approach to the synthesis of gold sponges. This is carried out by transferring a hyaluronic acid potassium salt/HAuCl4 aqueous solution into a stainless steel autoclave with a Teflon liner and heating in an oven at 180 °C for 6 h. Here, hyaluronic acid potas…
Surface dynamics of a thin polystyrene film probed by low-energy muons
Low-energy muons have been used to probe the local motion in a thin-film sample of polystyrene as a function of depth below the free surface. The muon spin relaxation in zero magnetic field is dominated by a muoniated radical state which is formed on the polystyrene ring. The muon spin-relaxation rate $\ensuremath{\la…
Processability of a metallocene‐catalyzed linear PE improved by blending with a small amount of UHMWPE
Abstract The processability of a metallocene‐catalyzed polyethylene blended in the melt with low amounts of ultra‐high molecular weight polyethylene was evaluated. Our morphological and thermal studies revealed that the blends were structurally heterogeneous, formed by a matrix of metallocene polyethylene and homogene…
Formal derivation of dissipative particle dynamics from first principles
We show that the Markovian approximation assumed in current particle-based coarse-grained techniques, like dissipative particle dynamics, is unreliable in situations in which sound plays an important role. As an example we solve analytically and numerically the dynamics of coarse-grained harmonic systems by using firs…
Linking Rings through Diamines and Clusters: Exploring Synthetic Methods for Making Magnetic Quantum Gates
Käfige, aus denen Türen führen: Verknüpfte paramagnetische Käfigkomplexe eignen sich potenziell als Quanten-Gates für die Verarbeitung von Quanteninformationen. In Experimenten konnten achtkernige {Cr7Ni}-Ringe durch organische wie metall-organische Fragmente zu supramolekularen Dimeren verknüpft werden (siehe Struktu…
Vaporization Study of YbCl3, YbBr3, YbI2, LuCl3, LuBr3, and LuI3 and a New Assessment of Sublimation Enthalpies of Rare Earth Trichlorides
The vapor pressures of YbCl 3, YbBr 3, YbI 2, LuCl 3, LuBr 3, and LuI 3 were measured by torsion and Knudsen effusion methods. Their temperature dependences may be reported as follows: YbCl 3 (s): log( p /kPa) = (11.30 ± 0.20) − (14420 ± 200)/( T /K) from (944 to 1096) K; YbBr 3 (s): log( p /kPa) = (11.51 ± 0.20) − (1…
Kinetics of Nonisothermal Polymer Crystallization
We adopt a cluster size distribution model to investigate the kinetics of nonisothermal polymer crystallization. The time dependencies of polymer concentration, number and size of crystals, and crystallinity (in Avrami plots) are presented for different cooling rates. The incubation period is also investigated at diff…
Temperature Variation of DC Conductivity of Poly(3-alkyl Thiophenes) and Their Cocrystals
The dc conductivity of poly(3-alkyl thiophenes) (P3ATs) and their cocrystals are measured in the temperature range of -130 to 150 degrees C. Both solvent-cast films and the melt-cooled films are used. The former exhibit a sharp increase followed by a decrease in conductivity, whereas the latter show only a sigmoidal i…
Electronic states and local structures of the photomagneticCu−MocyanidesCu2Mo(CN)8∙8H2OandCs0.5Cu1.75Mo(CN)8∙1.5H2Ostudied by x-ray absorption fine structure spectroscopy
The electronic states and local structures of photomagnetic CuMo cyanides, ${\mathrm{Cu}}_{2}\mathrm{Mo}{(\mathrm{C}\mathrm{N})}_{8}∙{\mathrm{H}}_{2}\mathrm{O}$ and ${\mathrm{Cs}}_{0.5}{\mathrm{Cu}}_{1.75}\mathrm{Mo}{(\mathrm{C}\mathrm{N})}_{8}∙1.5{\mathrm{H}}_{2}\mathrm{O}$, have been studied by Cu and Mo $K$-edge x-…
Effects of Polymerization Media on the Nanoscale Conductivity and Current−Voltage Characteristics of Chemically Synthesized Polyaniline Films
A current sensing atomic force microscope (CS-AFM) was used to probe the conducting homogeneity and band structures of fully doped polyaniline (PANI) films prepared from in situ chemical polymerization/deposition of aniline on indium tin oxide in various inorganic acids. The charge transport properties of PANI films d…
Energy levels of lanthanide ions in aLu2Si2O7host
Emission and excitation spectra of single crystals of ${\mathrm{Lu}}_{2}{\mathrm{Si}}_{2}{\mathrm{O}}_{7}$ doped with ${\mathrm{Ce}}^{3+}$, ${\mathrm{Pr}}^{3+}$, ${\mathrm{Nd}}^{3+}$, ${\mathrm{Sm}}^{3+}$, ${\mathrm{Eu}}^{3+}$, ${\mathrm{Tb}}^{3+}$, and ${\mathrm{Yb}}^{3+}$ were measured in the VUV and UV ranges in or…
Low-Temperature Growth and Photoluminescence Property of ZnS Nanoribbons
At a low temperature of 450 degrees C, ZnS nanoribbons have been synthesized on Si and KCl substrates by a simple chemical vapor deposition (CVD) method with a two-temperature-zone furnace. Zinc and sulfur powders are used as sources in the different temperature zones. X-ray diffraction (XRD), selected area electron d…
Novel Structural and Magnetic Properties of a 1-D Iron(II)−Manganese(II) LIESST Compound Bridged by Cyanide
The 1-D compound [Fe(L)(CN)2][Mn(hfac)2] (1), which adopts the -NC-Fe-CN-Mn- heterometallic structure, has been shown to exhibit light-induced excited spin-state trapping effects. After illumination, anti-ferromagnetic coupling was observed between the iron(II) (S = 2) and manganese(II) (S = 5/2) ions.
Liquid drop growth on a fiber
Abstract A quantitative model is described and verified to predict the growth of oil droplets by coalescence on a single nanofiber. The model considers a stream of fluid carrying many tiny droplets of a different fluid. The mechanisms by which the tiny droplets are captured by a drop growing on a fiber are considered.…
Fabrication of microporous thermoplastic polyurethane for use as small‐diameter vascular graft material. I. Phase‐inversion method
Fabrication conditions of microporous thermoplastic polyurethane to be used in small-diameter vascular grafts are studied. Porosity variations due to various factors such as concentration of PU solution, composition of coagulation bath, effect of coagulant temperature, and effect of dissolved air in PU solution are di…
Temperature-controlled growth of ZnO nanostructures: branched nanobelts and wide nanosheets
ZnO nanostructures with different morphologies have been achieved by simple thermal evaporation of mixed powders of ZnS, graphite and SnO 2 at 1050 °C in a flowing Ar atmosphere. Branched nanobelts and wide nanosheets of ZnO were formed on Si wafers at a temperature of 700 and 500 °C, respectively. As for the branched…
The Ring-Opening Reaction of Chromenes: A Photochemical Mode-Dependent Transformation
The efficiency of the photochemical ring-opening of chromenes (or benzopyrans) depends on the vibronic transition selected by the chosen excitation wavelength. In the present work, ab initio CASPT2//CASSCF calculations are used to determine the excited-state ring-opening reaction coordinate for 2H-chromene (C) and 2,2…
Flame‐retardant action of red phosphorus/magnesium oxide and red phosphorus/iron oxide compositions in recycled PET
Abstract Red phosphorus was combined with metallic oxides Fe 2 O 3 and MgO to improve the fire properties of recycled PET. Both Fe 2 O 3 and MgO act as co‐synergist agents at a total loading of 5 wt%. The analysis by diffraction X of the char formed during combustion shows that transformation of Fe 2 O 3 to Fe 3 O 4 o…
Anisotropic Metal Nanoparticles: Synthesis, Assembly, and Optical Applications
Abstract For Abstract see ChemInform Abstract in Full Text.