Materials Literature
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Heat capacity of halogen-bridged one-dimensional binuclear metal complex (so-called MMX chain) having four n-pentyl groups, Pt2(n-PenCS2)4I, was measured by adiabatic calorimetry. A first-order phase transition was observed at 207.4 K when measurement was made after cooling from room temperature. The enthalpy and entr…
Carbon steel is joined to aluminium using the ultrasonic brazing method with Zn–Al filler at 663 K, employing different ultrasound application times. Different reaction layers could be observed at the interface, containing compounds such as FeAl 3 , Fe 2 Al 5 , Fe 3 Al, and FeAl, and solid solutions such as Fe–Zn and…
An optical technique for eliminating the inaccuracy in the measurement of retardation caused by multiple-beam interference in anisotropic multilayer-structured thin film is developed by the detailed analysis of obliquely incident transmission ellipsometry. The director distribution of a nematic liquid crystal inside a…
Abstract ZnO nanowires and related materials are promising structures for new electronic and optical applications and devices. In the present article featured as Editor's Choice [1], ZnPbO nanowires have been synthesized and studied by structural and photoluminescence investigations. The cover picture shows in the low…
Abstract Einkristalle von [NH 3 CH 3 ][Gd(Cl 2 HCCOO) 4 ] wurden durch Reaktion von Gd 2 O 3 mit NH 3 CH 3 Cl in einer wässrigen Lösung von Cl 2 HCCOOH erhalten. Die Verbindung kristallisiert triklin in der Raumgruppe P 1¯ (Nr. 2, Z = 2, a = 811, 5 pm, b = 1228, 4 pm, c = 1228, 9 pm, α = 62, 43°, β = 87, 67°, γ = 84,…
Etching of phase-change memory thin films is essential in the processing for the manufacture of devices. The Ge/sub 2/Sb/sub 2/Te/sub 5/ thin film as a typical material for such purposes can be control-etched by an aqueous solution of 20% nitric acids (HNO/sub 3/). It was found that the Ge/sub 2/Sb/sub 2/Te/sub 5/ fil…
Well‐developed acicular Ba 2 NaNb 5 O 15 (BNN) seed crystals have been successfully prepared by the reaction between BaCO 3 , Nb 2 O 5 and molten NaCl salt. The effects of the calcination temperature, time, and weight ratio of the oxide mixture to salt on the morphology of BNN particles were investigated. Uniform acic…
Abstract Polymer cholesteric liquid‐crystal (PCLC) flakes were investigated for their electro‐optical behavior under an applied alternating‐current field. Shaped flakes, fabricated using soft lithography and suspended in dielectric‐fluid‐filled cells, reoriented more uniformly than randomly shaped flakes made by fract…
Purpose The aim of the present work was to study the synergistic effect of HEDP and zinc on inhibition of the corrosion of carbon steel in neutral oxygen‐containing chloride solutions, and to investigate the effect of zinc‐HEDP molar ratio on the effectiveness of the zinc‐HEDP inhibitive mixtures. Design/methodology/a…
Montmorillonite (MMT) was modified with chitosan (CS). The XRD and FT-IR analyses showed that the CS chains had intercalated into the MMT sheets and the strong chemical interaction between the Si-O bonds from MMT and the -NH 2 , -CONH- and -OH groups from CS was the driving force for intercalation. Polyacrylate (PAA)/…
The reagent Fe(η 5 -C 5 H 4 SeSiMe 3 ) 2 has been used for the formation of the new nanoclusters [Cu 20 Se 6 (Se 2 fc) 4 (PR 2 R‘) 10 ] (R = Ph, R‘ = Et; R = R‘ = n Bu) and [Cu 40 Se 12 (Se 2 fc) 8 (PPh 3 ) 9 ], which consist of ferrocenyl-passivated surfaces on CuSe cores.
A hyperbranched polyether polyol was reacted with isonicotinoyl chloride hydrochloride for the introduction of the pyridinyl moiety at the external surface. This pyridinylated hyperbranched polymer was subsequently interacted with cholesterol-based carboxylic acids for the formation of the corresponding hydrogen-bonde…
YdiB and its paralog AroE are members of the quinate/shikimate 5-dehdrogenase family. Enzymes from this family function in the shikimate pathway that is essential for survival of microorganisms and plants and represent potential drug targets. Recent YdiB and AroE crystal structures revealed the presence of a NAD(P)-bi…
The liquid crystalline (LC) properties of two series of non‐symmetric dimesogenic compounds consisting of cholesterol and azobenzene‐based moieties interconnected by ω‐oxyalkanoyl spacers of varying length are compared: one series (AOC‐n) has an octyloxy chain attached to the azobenzene mesogen unit while the other (A…
Polyhydroxyalkanoates (PHAs) are homo or hetero polyesters of (R)-hydroxyalkanoates accumulated in various microorganisms under growth-limiting condition in the presence of excess carbon source. They have been suggested as biodegradable substitutes for chemically synthesized polymers. Recombinant Escherichia coli is o…
Dellaventuraite is a new amphibole species from the Kajlidongri manganese mine, Jhabua District, Madhya Pradesh, India. It occurs with leakeite, kornite, albite, braunite, and bixbyite associated with cross-cutting epigenetic veins that have reacted with regionally metamorphosed rocks containing Mn-rich minerals (brau…
Abstract In 1,3:2,4-bis-O-(p-methylbenzylidene)-d-sorbitol (PDTS)/molten i-PP systems, the self-assembling ramified fibrils of PDTS are formed at Tfg,c higher than Tc during the cooling process. They function as the nucleators for the nucleation of molten i-PP. The ramified fibrils have the following characteristics:…
Abstract A new method for the preparation of [ n ]ladderanes is presented, based on a one‐pot [2π+2π] photocycloaddition of [2.2]paracyclophane pseudo‐ gem bis(polyene) precursors. [3]‐ and [5]ladderanes could be isolated and were fully characterized, including their X‐ray structure analysis. The overall chemical yiel…
The formation of mineral scale (carbonate/sulphate/sulphide) within the near well bore; production tubing and topside process equipment has presented a challenge to the oil and gas industry for over 50 years. Chemical methods to control scale have been developed including scale squeeze treatments and continual chemica…
The present paper introduces various topics and aspects of dynamic vulcanization as applied to thermoplastic elastomers. The classification of polymer blends and thermoplastic elastomers, the development of thermoplastic vulcanizates, and the use of various types of crosslinking systems (with special emphasis on perox…