Functionalization of 5,10,15,20‐Tetrasubstituted Porphyrins
Abstract For Abstract see ChemInform Abstract in Full Text.
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Role of nonpairwise interactions on phonon thermal transport
In this paper, the phonon system for a perfect silicon lattice is obtained by means of a model considering a phenomenological potential that includes both two- and three-body contributions. Phonon dispersions are discussed, and anharmonic contributions to the phonon Hamiltonian are evaluated. The model is compared wit…
FastQ-tensor method for modeling the dynamics of defects in a liquid crystal director field
A fast Q-tensor method, which can model the defect dynamics in a liquid crystal director field, is presented. Conceptually based on the Oseen-Frank approach, we have added temperature energy density terms in addition to the strain energy terms, and an improved normalization method for fast calculations. The method is…
The Effects of Household Fabric Softeners on the Thermal Comfort and Flammability of Cotton and Polyester Fabrics
(ABSTRACT) This study examined the effects of household fabric softeners on the thermal comfort and flammability of 100 % cotton and 100 % polyester fabrics after repeated laundering. Two fabric properties related to thermal comfort, water vapor transmission and air permeability, were examined. A 3 X 2 X 3 experimenta…
Preparation of Discotic Liquid Crystal/Amorphous Block Copolymers and Evidence for Microphase Separated Amorphous/LC Structure
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPreparation of Discotic Liquid Crystal/Amorphous Block Copolymers and Evidence for Microphase Separated Amorphous/LC StructureOlga A. Otmakhova, Sergei A. Kuptsov, Raisa V. Talroze, and Timothy E. PattenView Author Information A. V. Topchiev Institute of Petrochemical Synthesis…
NCHU‐3: A Crystalline Inorganic–Organic Hybrid Molecular Sieve with Extra‐Large Cages
A Chinese-vaselike cage, depicted, is contained within the crystalline nanoporous [Ga2(VO)3K2(OH2)3(C2H4P2O6)4(H2O)13] structure, NCHU-3, and is thermally stable up to 550 °C. NCHU-3 exhibits a highly reversible lithium-ion-intercalation and de-intercalation cycle between +3 and +5 volts. Such cyclability is a key asp…
Applications of Porphyrins and Metalloporphyrins to Materials Chemistry
Abstract For Abstract see ChemInform Abstract in Full Text.
Aggregate Manganese Schiff Base Moieties by Terephthalate or Acetate: Dinuclear Manganese and Trinuclear Mixed Metal Mn2/Na Complexes
A reaction system consisting of terephthalic acid, NaOH, inorganic Mn(II) or Mn(III) salt, and salicylidene alkylimine resulted in dinuclear manganese complexes (salpn)(2)Mn(2)(mu-phth)(CH(3)OH)(2) (1, salpn = N,N'-1,3-propylene-bis(salicylideneiminato); phth = terephthalate dianion), (salen)(2)Mn(2)(mu-phth)(CH(3)OH)…
Phonon drag thermopower in an AlGaN/GaN heterostructure
Abstract The theoretical thermopower of a two‐dimensional electron gas (2DEG) is studied in a clean AlGaN/GaN heterostructure of zincblende (ZB) and wurtzite (WZ) symmetry over the temperature range 0.1–10 K. The phonon drag thermopower ( S g ) due to 2DEG coupling with 3D longitudinal and transverse acoustic phonons…
Synthesis of Poly(ethylene terephthalate)‐block‐Poly(tetramethylene oxide) Copolymer by Direct Polyesterification of Reactive Oligomers
Abstract The object of this study was the synthesis of thermoplastic elastomer compounds by direct copolyesterification of reactive oligomers of poly(ethylene terephthalate) (PET) and of poly(tetramethylene oxide) (PTMO). PET was glycolysed to synthesise hydroxytelechelic oligomers of PET. Commercially available hydro…
Characterization of Oxide Surfaces and Zeolites by Carbon Monoxide as an IR Probe Molecule
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Enzyme‐Catalyzed Preparation of Aliphatic Polyesters Containing Thioester Linkages
Abstract Aliphatic polyesters containing thioester linkages were enzymatically prepared by both the copolymerization of lactone with mercaptoalkanoic acid and by the transesterification of polyesters with mercaptoalkanoic acids. The enzymatic copolymerization of ε ‐caprolactone with 11‐mercaptoundecanoic acid (11MU) a…
Highly Substituted Porphyrins
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Synthesis of meso‐Substituted Porphyrins
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Metal-insulator crossover behavior at the surface ofNiS2
We have performed a detailed high-resolution electron spectroscopic investigation of ${\mathrm{NiS}}_{2}$ and related Se-substituted compounds, ${\mathrm{NiS}}_{2\ensuremath{-}x}{\mathrm{Se}}_{x},$ which are known to be gapped insulators in the bulk at all temperatures. A large spectral weight at the Fermi energy of t…
Stabilization of β‐SiB3 from Liquid Ga: A Boron‐Rich Binary Semiconductor Resistant to High‐Temperature Air Oxidation
Unlike the original form of SiB3, which has a huge compositional spread in its Si/B ratio and a crystal structure with Si atoms randomly distributed over all its B12 cages, the new form of SiB3 (β form; see structure) is stoichiometrically and crystallographically ordered. The clear segregation of Si and B atoms in th…
Recognising multiple partial discharge sources in power transformers by wavelet analysis of UHF signals
Partial discharges (PD) in a transformer generate transient UHF signals that resonate within the tank. Where more than one source of PD or interference is present, the ability to separate incoming signals depending on their point of origin would enhance the diagnostic process. A wavelet-based method for recognising UH…
Deformation Behavior of PET, PBT and PBT‐Based Thermoplastic Elastomers as Revealed by SAXS from Synchrotron
Abstract The present paper discloses the changes in the nanostructure as revealed by small‐angle X‐ray scattering (SAXS) of synchrotron radiation of anisotropic semi‐crystalline samples of polyester and poly(ether ester) type differing in their chemical composition, while subjected to controlled progressive elongation…
Induction of ferroelectricity in theB2phase of a liquid crystal composed of achiral bent-core molecules
We report the observation of a transition from the antiferroelectric B2 phase to a ferroelectric phase in a liquid crystal composed of achiral bent-core (banana-shaped) molecules. The transition is induced by an electric field of magnitude larger than the switching threshold and is not reversible, i.e., the original B…
Small Structures Fabricated Using Ash-Forming Biological Materials as Templates
Different ash-forming biological materials such as gills of mushrooms, cotton wool, silk fiber, spider silk, dog's hair, and human hair were examined as templates to fabricate small structures. Ashes obtained from gills of mushrooms, silk fiber, and spider silk were miniaturized replicas of the original materials, whe…