Materials Literature
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Experimental results concerning end-linked poly(dimethylsiloxane) pregel clusters quenched at different distances from the gelation threshold are reported. Static and quasielastic light scattering experiments and intrinsic viscosity measurements allow us to verify that static properties of this chemical system are pro…
Abstract Hydrolytically stable phosphorus‐containing monomers, such as 4,4′‐bis(fluorophenyl)methylphosphine oxide (BFPMPO), 4,4′‐bis(hydroxyphenyl)methylphosphine oxide (BOHPMPO), and 4,4‐bis(hydroxyphenyl)phenylphosphine oxide (BOHPPO), were synthesized and used in nucleophilic aromatic substitution poly‐condensatio…
Micro- and nanocrystalline systems exhibit properties that differ markedly from bulk systems. Diamond, a prototypical system, demonstrates a broadening, shift, and emergence of Raman phonon modes that are believed to originate from finite-size effects. Such information should be useful in constraining confinement mode…
SiO 2 /Ge nanocrystal/SiO2 structures have been fabricated by deposition of Ge film on a SiO2 layer and subsequent oxidation of the structure at a temperature between 800 °C and 1000 °C. Secondary ion mass spectrometry results indicate that the Ge precipitates into the bulk SiO2 at a density of 1×1012 cm−2. Raman spec…
The nature of the thermally stimulated discharge current (TSDC) for polyethylene terephthalate samples in the temperature range from room temperature to above glass-rubber transition temperature of the amorphous phase is analyzed. The well conditioning of the sample is strictly necessary in order to have a good reprod…
A series of fluoro-substituted tolane derivatives: (R)-1-methylheptyl 3-fluoro-4-(3-fluoro-4- n alkoxybenzoyloxy)tolane-4-carboxylates is reported. Some members of this series exhibit the phase sequence: Cr-SmC*-TGBC-TGBA-BPI-BPII-BPIII-I. The blue phases, the TGBA and TGBC phases and the SmC* phase were characterized…
Summary Cryptopodzolic Soils are characterized by a thick blackish‐brown mineral horizon rich in organic matter, the dark colour of which masks the morphological characteristics of podzolization. Little is known about the specific site factors that lead to the formation of these soils. Four representative soil profile…
Abstract Organic charge transfer complexes form a large variety of electronic structures from insulating state to metallic state in low-dimensional frameworks, which are governed by the competition between the transfer integral and the on-site Coulomb interaction. In the insulating regime, the generation of localized…
A new strategy has been employed to control the cross-linking of polyaniline that allows the synthesis of high molecular weight, conducting copolymers. The new method utilizes aniline−formaldehyde condensates (AFC) to establish the upper limit of possible cross-link sites in an AFC−polyaniline copolymer. By changing t…
An investigation was conducted to determine how the advancement of chemical reactions and the prepolymer molecular weight affect the reorientational dynamics and intermolecular cooperativity in model epoxy−amine systems. Experimental results were obtained by dielectric spectroscopy over a wide range of frequency and t…
Ferroelectric thin films as the recording media of scanning probe microscope-based storage devices were investigated using an atomic force microscope(AFM) technique. Polarization domains were formed in the PbZrxTi1-xO3(PZT) thin films epitaxialy grown on the epitaxial SrRuO3(SRO) thin films on SrTiO3 substrate by appl…
Reaction of [( n -C 4 H 9 ) 4 N] 4 [Mo 8 O 26 ] with nitrate salts of rare earth metals yields two different series of new compounds [Ln(Mo 8 O 26 ) 2 ] 5 - and [{Ln(NO 3 ) 3 } 2 (Mo 8 O 26 )] 4 - (Ln = Y, La, Ce, Pr, Nd, Gd, Yb) as tetra- n -butylammonium salts. X-ray structural analyses of [( n -C 4 H 9 ) 4 N] 5 [La…
Derivatives of DMABN are described, where the cyano group is replaced by an amide function with different acceptor strengths. This leads to a consistent variation of the dual fluorescence observed, describable within the established TICT model. Time resolved experiments give evidence of an additional complication with…
The ionic and electronic transport properties of (with Me = Fe or Cr and x = 0, 0.05, or 0.20) were studied by impedance spectroscopy in air (250 to 1000°C), high temperature (700 to 1000°C) ac conductivity measurements as a function of oxygen partial pressure ( ranging from air to about 10 −15 Pa), and ion blocking m…
We investigated the composition, properties, and utility of a novel copolymer of P(AAm- co -EG) designed to be an adaptable, durable, and biocompatible surface treatment of metallic, polymeric, and ceramic materials. Solution deposition and photoinitiation reactions were employed to graft a silane layer and then two s…
A systematic study of the binding of carbohydrates by functionalized zinc porphyrins indicated that [5, 15-bis(8-quinolyl)porphyrinato]zinc(II) ( 1 ) showed marked affinity for octyl glucoside and mannoside in CHCl 3 (−Δ G ° = 4.5−6.3 kcal mol - 1 ). Analysis of the complexation-induced shifts of the carbohydrate OH p…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis and Cation-Mediated Electronic Interactions of Two Novel Classes of Porphyrin−Fullerene HybridsPhil S. Baran, Regina R. Monaco, Ahsan U. Khan, David I. Schuster, and Stephen R. WilsonView Author Information Department of Chemistry, New York University New Yor…
A high coordination lattice was recently introduced for the simulation of coarse-grained rotational isomeric state (RIS) model chains. This second nearest neighbor diamond (2nnd) lattice is formed by connecting every other site on a tetrahedral lattice. Monte Carlo simulations of polyethylene (PE) melts have recently…
The upper critical field, ${H}_{c2}$, of LuN${\mathrm{i}}_{2}$${\mathrm{B}}_{2}$C has been determined from the temperature dependence of the magnetization. A temperature dependent anisotropy within the basal plane which decreases from a value of 1.1 at 4.5 K to a value of 1.0 at ${T}_{c}$ and an almost temperature ind…
The two germanates K 2 MgGeO 4 and K 2 CdGeO 4 have been synthesized by solid-state reaction. These compounds are isostructural with K 2 ZnGeO 4 , space group Pca 2 1 (No. 29), Z =8. Unit cell parameters were determined: for K 2 MgGeO 4 a =11.1810(11), b =5.5708(6), c =15.8694(16) Å, V =988.5(3) Å 3 and for K 2 CdGeO…