Materials Literature
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Physicochemical properties of a homogeneous series of chitosans with different degrees of acetylation and almost the same degree of polymerization were investigated in an ammonium acetate buffer. Techniques such as interferometry, static light scattering (in batch or coupled on line with a chromatographic system), and…
The thermal conductance of interfaces between epitaxial TiN and single crystal oxides is measured at temperatures between 79.4 and 294 K using time-domain thermoreflectance. The analysis method relies on the ratio of the in-phase and out-of-phase signals of the lock-in amplifier for more accurate data analysis. The va…
Current theories suggest that multiwalled nanotubes may form through a scrolling mechanism ([1][1], [2][2]). The concept that scrolling could lead to nanotube-like structures ([3][3]) inspired us to extend our recent work on making colloidal suspensions of layered compounds ([4][4]) to graphite.
Superhydrophobic surfaces are generally made by controlling the surface chemistry and surface roughness of various expensive materials, which are then applied by means of complex time-consuming processes. We describe a simple and inexpensive method for forming a superhydrophobic coating using polypropylene (a simple p…
Impregnation of hypercrosslinked polystyrene (HPS) with tetrahydrofuran (THF) or methanol solutions containing platinic acid resulted in the formation of Pt(II) complexes within the nanocavities of HPS. The highest selectivity (98% at 100% conversion) measured during the catalytic oxidation of L-sorbose in water was o…
Abstract Systematische Studien zur Synthese neuer Erdalkalimetallthioborate und zum Kationeneinfluß auf die Strukturen ternärer Verbindungen dieses Typs führten zu den Strontiumthioboraten Sr 3 (BS 3 ) 2 und Sr 3 (B 3 S 6 ) 2 . Die neuen Verbindungen wurden aus Strontiumsulfid, amorphem Bor und Schwefel in Festkörperr…
Ein molekularer Magnet mit Tc=3.5 K wurde durch Umsetzung von GdCl3⋅6 H2O mit Li[TCNQ] (TCNQ=7,7,8,8-Tetracyanchinodimethan) erhalten. In der Titelverbindung liegen laut Einkristall-Röntgenbeugung anionische und kationische (siehe Bild) Netze aus Gd, TCNQ und H2O in unterschiedlichen Verhältnissen nebeneinander vor.
Abstract Rb 3 As 11 und Cs 3 As 11 wurden aus den Elementen synthetisiert und die Kristallstrukturen der geordneten Raumtemperaturmodifikationen auf der Basis von Röntgen‐Einkristalldaten bestimmt. In den Zintl‐Phasen bilden die As‐Atome chirale Ufosan‐Anionen As mit As‐As‐Abständen im Bereich zwischen 238 und 248 pm.…
Abstract Die Caesium‐Lanthanoid‐Thiosilicate CsM[SiS 4 ] (M = Sm — Tm) kristallisieren allesamt orthorhombisch in der nichtzentrosymmetrischen Raumgruppe P2 1 2 1 2 1 mit vier Formeleinheiten pro Elementarzelle. Ihre Gitterkonstanten bewegen sich in Bereichen von a = 630 — 640 pm, b = 665 — 673 pm und c = 1763 — 1778…
View the article online for updates and enhancements.You may also like Electrochemical growth of ZnSe thin films, characterization and heterojunction applications Hatice Asl Uurlu and Yldray Hamurcu - Electrochemical Deposition of n-Type ZnSe Thin Film Buffer Layer for Solar Cells P. Prabukanthan and G. Harichandran -…
The origin of observed positive core-level shifts in sparse Au clusters on oxides is explored in representative metal oxide systems, namely, Au/MgO(001) and ${\mathrm{A}\mathrm{u}/\mathrm{T}\mathrm{i}\mathrm{O}}_{2}(110)$ with a varying coverage and also in the presence of surface oxygen vacancies, by using the densit…
New Ca 3 - x Th x Mn 2 O 7 ( x = 0−0.2) compounds with the Ruddlesden−Popper structure have been synthesized. Their crystal structures were refined from X-ray powder diffraction data, taking into account a small orthorhombic (space group Cmcm or Cmc 2 1 ) distortion of the parent tetragonal I 4/ mmm structure. Doping…
Abstract Bi 37 InBr 48 wurde in Form schwarzer Kristalle aus Bismut, Indium und BiBr 3 durch langsames Abkühlen stöchiometrisch zusammengesetzter Schmelzen von 570 K auf 470 K dargestellt. Aus Röntgenbeugungsuntersuchungen an Pulvern und Einkristallen geht hervor, dass die Verbindung in der Raumgruppe P 6 3 kristallis…
Polymethylmethacrylate (PMMA) colloids sterically stabilized by a layer of chemically grafted poly-12-hydroxystearic (PHSA) are widely used in experiments as model hard spheres. However, due to the coating, the interaction between particles is slightly soft. Here we report a numerical study of the effect of the PHSA c…
Abstract The crystal structure of the ζ 2 ‐phase Al 3 Cu 4‐δ was determined by means of X‐ray powder diffraction: a = 409.72(1) pm, b = 703.13(2) pm, c = 997.93(3) pm, space group Imm2 , Pearson symbol oI24‐3.5 , R I = 0.0696. ζ 2 ‐Al 3 Cu 4‐δ forms a distinctive a × √3 a × 2 c superstructure of a metal deficient Ni 2…
Crystals of copper(II) arsenate NaCuAsO(4) were grown by conventional high-temperature, solid-state methods in molten-salt media. The compounds were characterized by single crystal X-ray diffraction, UV-vis spectroscopy, and magnetic susceptibility measurements. NaCuAsO(4) crystallizes in a monoclinic lattice with a =…
We employ mean-field lattice density functional theory to investigate the phase behavior of a binary $(A\ensuremath{-}B)$ mixture confined to nanoscopic slit pores with chemically homogeneous walls. We consider only nearest-neighbor interactions in symmetric mixtures, where ${\ensuremath{\epsilon}}_{\mathrm{AA}}={\ens…
High-resolution x-ray diffraction and ac-calorimetric experiments have been carried out on the liquid-crystal octyloxycyanobiphenyl in which aerosil particles are dispersed. The measurements were made over a temperature range around the bulk nematic to smectic-A transition temperature. At this transition the liquid cr…
Amine-templated vanadium sulfates of the formula [HN(CH(2))(6)NH][(V(IV)O)(2)(OH)(2)(SO(4))(2)].H(2)O, I, [H(3)N(CH(2))(2)NH(3)][V(III)(OH)(SO(4))(2)].H(2)O, II, and [H(2)N(CH(2))(4)NH(2)][(V(IV)O)(H(2)O)(SO(4))(2)], III, have been prepared under hydrothermal conditions. These vanadium sulfates add to the new emerging…
We demonstrate that negative refraction occurs for both cw and pulsed electromagnetic waves when traversing from a "right-handed" (index > 0) to a "left-handed" (index < 0) material (LHM) which has causal dispersive intrinsic properties. We also demonstrate that a divergent line source spaced a distance H in front of…