Materials Literature
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Fouling of stainless steel heat transfer surfaces by soluble and suspended solids within lignocellulosic biomass process streams during evaporation elevates energy consumption and cleaning costs associated with this unit operation. Efficient evaporation is important for long-term economic stability of the biorefinery…
Abstract The reaction of Tc(+7) with H2O2 has been studied in HNO3 and the speciation of technetium was performed by UV/Vis spectroscopic analysis. UV/Vis measurements show that for HNO3 concentrations of more than 7 M and H2O2 concentrations of 4.25 M, Tc(+7) reacts immediately and red solutions are obtained, whereas…
Gegensätze ziehen sich an: Gold- oder CdS-Nanopartikel und ionische Farbstoffmoleküle können supramolekulare Aggregate mit einer definierten Größe zwischen 100 und 300 nm bilden, wenn man ein Makroion als Templat und Bindeglied verwendet. Das Bild zeigt das erhaltene Gold-Dendrimer-Farbstoff-Aggregat (blaue Kugeln: de…
Details of the structures of two polymorphs of tris(ethylenediamine)cobalt(III) tetrathioantimonate(V), [Co(C₂H₈N₂)₃][SbS₄], are reported. The first polymorph crystallizes in the orthorhombic space group Pna2₁, whereas the second polymorph belongs to the tetragonal space group P4₂bc. Both structures contain octahedral…
The 120 MeV${\rm Au}^{9+}$ion induced modifications in a${\rm ZnS}{:}{\rm TiO}_{2}/{\rm p}\hbox{-}{\rm Si}$quantum dot (QD) heterojunction has been studied by In-Situ current-voltage$(I\hbox{--}V)$measurements. This paper shows that the process of ion irradiation is a novel technique in modifying the electronic proper…
In situ measurements of the resistance changes of carbon nanotube bundles irradiated by 60Co γ‐quanta at room temperature are presented. The peculiarity of our study consists in providing the sample irradiation in a hermetic cell filled with different gases at atmosphere pressure. Here we demonstrate the results for i…
Nichtgemischtvalente reduzierte Polyoxometallate – Dawson-ähnliche {W18O56XO6}-Cluster (X=IVII oder TeVI) mit lokalisiertem redoxaktivem Templat – wurden synthetisiert und bezüglich ihrer Redoxeigenschaften mit dem reinen Wolframcluster (d. h. X=WVI) verglichen. Bei Ein-Elektronen-Reduktion lokalisiert sich das Elektr…
At sufficiently high temperatures, the center-of-mass microscopic diffusion dynamics of liquids is characterized by a single component, often with weak temperature dependence. In this regime, the effective cage made by the neighbor particles cannot be sustained and readily breaks down, enabling long-range diffusion. A…
The carrier dynamics and recombination characteristics of vertically aligned silicon nanowires are investigated using terahertz emission and photoluminescence spectroscopy, respectively. It is observed that the presence of pores on the walls in two-step-synthesized silicon nanowires greatly affects the carrier dynamic…
The physicochemical properties and biomedical applications of Fe3O4 microspheres are strongly dependent on their size. Herein we report a new approach to tune the size of carboxyl-functionalized Fe3O4 microspheres via a polyol process. The diameter of Fe3O4 microspheres can be tuned in the range of 300–900 nm by simpl…
We revisit the electrodynamics of resonant high-Q interactions in atomic systems with a view to gaining insights into the design of meta-atoms and hence bulk metamaterials with profoundly different electromagnetic responses. The relevance of phase coherence and nonlinearity in charged systems is emphasized, as is the…
Abstract A simple and sensitive method for simultaneously measuring dopamine (DA), ascorbic acid (AA), and uric acid (UA) using a poly(1‐aminoanthracene) and carbon nanotubes nanocomposite electrode is presented. The experimental parameters for composite film synthesis as well as the variables related to simultaneous…
The electronic structure and stability of Cu(111)-hosted Pt overlayers with and without the presence of atomic oxygen have been studied by means of core-level spectroscopy and density functional theory (DFT). Because of lattice mismatch, Pt(111) overlayers grown on Cu(111) are compressively strained, and hard X-ray ph…
A core-resonance cylindrical whispering gallery mode (WGM) laser is reported in dye-doped nematic liquid crystals (NLCs) filled in a glass capillary. This laser runs on the basis of the properties that NLC has an extraordinary refractive index much higher than that of a glass and that it plays as a good solvent for la…
In this paper, we report on the spectral dependence of Δn=no−ne for CdGa2S4 single crystals for shorter and longer wavelengths than the isotropic wavelength λ0=485.7 nm (300 K). It was established that Δn is positive at λ>λ0 and it is negative in the spectral range λ<λ0. The isotropic wavelength λ0 exhibits blue spect…
In this paper we propose a crystalline motion of spiral-shaped polygonal curves with a tip motion as a simple model of a step motion on a crystal surface under screw dislocation. We give a tip motion anddiscuss the behavior of the solution curves by crystalline curvatureflow with a driving force. We show that the solu…
Intrinsic kinetics of HCl oxidation over a Cu/Ce composite oxide catalyst have been studied using an integral tubular reactor. The kinetic data were measured after elimination of the influence of external and internal diffusion at 390–420 °C, with n HCl / n O 2 ranging from 1 to 4 and W / F A0 ranging from 50 to 350 g…
Abstract A green chemistry method to nano‐roughen a Pt disk microelectrode has been successfully developed via electrochemical alloying‐dealloying in an ionic liquid bath comprising of ZnCl2 and 1‐ethyl‐3‐methylimidazolium chloride. The nano‐roughened Pt layer possesses bark‐like nanoporous structures characteristic o…
We study sequential tunneling of magnetic excitations in nonitinerant systems through triangular molecular magnets. It is known that the quantum state of these molecular magnets can be controlled by application of an electric or a magnetic field. Here, we use this fact to control the flow of a pure magnetization curre…
The radical copolymerization of N‐substituted maleimides containing polymethylene and poly(ethylene oxide) side chains as the N‐substituent groups with isobutene, styrene, and α‐methylstyrene as the electron‐donating monomers is carried out in order to investigate the structure and thermal properties of the resulting…