Materials Literature
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We investigate a disordered single-walled carbon nanotube (SWCNT) in an effective-medium supercell approximation (EMSCA). The first type of disorder that we consider is the presence of vacancies. Our results show that the vacancies induce some bound states on their neighbor host sites, leading to the creation of a ban…
Inherent structures give insight into the structural changes that accompany the glass transition. Here, we present data on the energetics and configurations of inherent structures for various compositions in the NaCl−CsCl system, which are dominated by long-range ionic interactions. By choosing these compositions so a…
In general, matter is broadly divided info three groups, %lids, Liquids and Gases. When solid is heated it First melts into liquid and on further heating moves to gaseous state. Some materials exhibit interesting intermediate between solid and fiquid called liquid crystals. Liquid crystals (ICs) ore defined as •conden…
Modifizierung von Tetrathiafulvalen mit einem Imidazolylrest als H-Brücken-Donor ermöglicht die Bildung eines H-Brücken-gebundenen 2:1-Charge-Transfer-Komplexes mit Chloranil. Die Komponenten stapeln sich zu einem dreidimensionalen Netzwerk mit zahlreichen S⋅⋅⋅S-Wechselwirkungen (siehe Bild). Erstmals wurde hier metal…
Delta crystallin, a taxon-specific crystallin present in avian eye lenses, is homologous to the urea cycle enzyme ASL (argininosuccinate lyase). Although there are two delta crystallin isoforms in duck lenses, ddeltac1 (duck delta1 crystallin) and ddeltac2 (duck delta2 crystallin), only ddeltac2 is catalytically activ…
Tosylation of chitin under homogeneous conditions was achieved by the reaction of tosyl chloride with chitin in a DMAc/LiCl solvent system. The resultant tosyl-chitin was fully N-acetylated with acetic anhydride in methanol. The fully acetylated tosyl-chitin was subsequently reacted with the sodium salts of ethyl p-hy…
The electrochemical response of open/closed forms of 6-nitro-1‘,3‘,3‘-trimethylspiro[2 H -1-benzopyran-2,2‘-indoline] ( SP ) associated with zeolite Y ( SP@Y ) and MCM-41 silicates with or without framework Al ( SP@AlMCM and SP@MCM, respectively) is described upon immersion of zeolite-modified polymer film electrodes…
Abstract The solubility of nine aroma compounds (acetone, 2‐butanone, 2‐hexanone, 2‐octanone, ethyl acetate, ethyl butanoate, ethyl hexanoate, n ‐hexanal, and n ‐hexanol) in both water and various aqueous solutions was measured at 25 °C using the mutual solubility method. The aqueous solutions consisted of sucrose, gl…
Abstract In the framework of electricity production from molten carbonate fuel cells (MCFC), this work presents the results obtained from steady state process simulation, coupled with a detailed dynamic model for the cell. The derivation of the model is briefly outlined, and detailed results of the simulation are repo…
Abstract The viscosity of freshly prepared poly(vinyl chloride) (PVC) plastisol increases with time, and this phenomenon is called viscosity aging . The increase is rapid in the beginning and slows down to a quasistable value, but a very slow increase continues. The phenomenon may be a result of either the deagglomera…
Water-soluble ferrous porphyrin (Fe(II)TPPS) was prepared by complexation reaction of free base porphyrin (H2TPPS) with iron(II) ions in the presence of iron(III)-trapping acetate buffer; the catalytic and photoinduced properties of this air-stable complex proved unambiguously its sitting-atop structure.
[structure: see text] Synthesis and UV-vis, IR, and EPR spectroscopic characterizations, together with X-ray structural analysis, of functional nitronyl- and iminonitroxides attached to pyrazolylbipyridine are described. The exchange interactions between the nitronylnitroxides are found to be stronger than for the imi…
Internal oxidized copper was tested by isothermal mechanical spectroscopy in a medium temperature range (300–600 K). Experimental results show the existence of a non-thermally activated effect at low temperature and of a relaxation peak at higher temperatures. The material microstructure was studied by combination of…
In collagen, strands of the sequence XaaYaaGly form a triple-helical structure. The Yaa residue is often (2S,4R)-4-hydroxyproline (Hyp). The inductive effect of the hydroxyl group of Hyp residues greatly increases collagen stability. Here, electron withdrawal by the hydroxyl group in Hyp and its 4S diastereomer (hyp)…
We study an effective one-dimensional (1-D) orbital $t\text{\ensuremath{-}}J$ model derived for strongly correlated ${e}_{g}$ electrons in doped manganites. The ferromagnetic spin order at half filling is supported by orbital superexchange $\ensuremath{\propto}J$ which stabilizes orbital order with alternating ${x}^{2…
We have investigated the structural and magnetic properties of ${\mathrm{PrBaCo}}_{2}{\mathrm{O}}_{5+\ensuremath{\delta}}$ $(\ensuremath{\delta}\ensuremath{\simeq}0.75)$ layered cobaltite. By means of neutron and synchrotron x-ray powder diffraction we have determined the ordered distribution of oxygen vacancies in ${…
A brighter future for siloles. Luminescent silole chromophores with the highest quantum efficiencies reported for a fully substituted monomeric silole are generated by altering the steric properties of the substituent groups. Treatment of 1,1-dimethylsiloles with Bu4NF (TBAF) in THF rapidly gives stereospecific desily…
The compound of stoichiometry Mn(II)3[Mn(III)(CN)6]2.zH2O (z = 12-16) (1) forms air-stable, transparent red crystals. Low-temperature single crystal optical spectroscopy and single crystal X-ray diffraction provide compelling evidence for N-bonded high-spin manganese(II), and C-bonded low-spin manganese(III) ions arra…
Mehr hilft mehr: Fluoreszierende photochrome organische Nanopartikel (FPONs) aus 1 (siehe Bild) zeigen eine mit zunehmender Konzentration stark ansteigende Fluoreszenzemission sowie eine bistabile Photochromie. Ein kontrastreiches Ein/Aus-Schalten der Fluoreszenz wurde in größenabgestimmten FPONs aus 1 und in einem wi…
Fine-tuning the N-donor ability of a bidentate aminopyridyl ligand facilitated the selective synthesis of complexes 1 (no methyl substituent) and 2 (with a methyl substituent) which possess valence tautomeric nickel(II) semiquinonato and nickel(III) catecholato frameworks, respectively.