Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The chloroiron corrolates of 2,3,7,8,12,13,17,18-octamethyl- and 7,13-dimethyl-2,3,8,12,17,18-hexaethylcorrole ([(Me8C)FeCl] and [(7,13-Me2Et6C)FeCl], respectively) and their bisimidazole complexes have been investigated by NMR spectroscopy as a function of temperature, and by EPR spectroscopy at 4.2 K. Magnetic susce…
We investigate the formation and coalescence of surface relief structures in symmetric diblock copolymers films of poly(styrene- b -2-vinylpyridine) (PS−PVP) on chemically patterned surfaces. The substrates have patterns of self-assembled monolayers (SAMs) produced by microcontact printing HO-terminated (HO−) SAM stri…
Coronal structures of the micelles spontaneously formed in water by poly(ethylene oxide)- b -polybutadiene (PEO−PB) were investigated using small-angle neutron scattering (SANS). Selective deuterium labeling of the hydrophobic PB block was employed to enhance the neutron scattering contrast between the PEO and PB segm…
Block copolymers with semifluorinated monodendron side groups were synthesized by attachment of a first generation 2- or 3-armed monodendron acid chloride to a hydroxylated poly(styrene- b -1,2/3,4-isoprene). A convergent growth strategy was developed to synthesize the monodendron groups in good yield using an approac…
Solid-solid thermal boundary resistance Rb plays an important role in determining heat flow, both in cryogenic and room-temperature applications, such as very large scale integrated circuitry, superlattices, and superconductors. The acoustic mismatch model (AMM) and the related diffuse mismatch model (DMM) describe th…
A theoretical model has been developed to describe the bulk-degradation behavior of model PEG- b -PLA hydrogels. Utilizing a statistical approach to predict the cleavage of cross-links within these networks, the model accounts for both structural and kinetic issues during the degradation and, from direct comparison, c…
Several versions of free-volume theory have been proposed to correlate or predict the solvent diffusion coefficient of a polymer/solvent system. The quantity of free volume is usually determined by the Williams–Landel–Ferry (WLF) equation from viscosity data of the pure component in these theories. Free volume has bee…
ADVERTISEMENT RETURN TO ISSUEPREVNoteDynamic Properties of an Amorphous Polyethylene NanofiberVisit Vao-soongnern and Wayne L. MatticeView Author Information Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909 Cite this: Langmuir 2000, 16, 16, 6757–6758Publication Date (Web):July 11, 2000Pub…
An average structure of incommensurately modulated monoclinic InTi 0.75 Fe 0.25 O 3.375 was determined using single-crystal X-ray diffraction. Unit cell parameters are a = 5.9207(8), b = 3.4249(5), c = 6.3836(9), and β = 107.96(1) with Z = 2, and the space group is C 2/ m . The structure with pseudorhombohedral symmet…
The electrooxidation behavior of thiophene and 3-methylthiophene on a Pt surface in an acetonitrile + tetrabutylammonium tetrafluoroborate solution were investigated. The electropolymerization of these monomers was studied in neutral, acidic, and basic media. The effects of thiophene concentration and the added acid w…
Using the full-potential linearized augmented-plane-wave (FLAPW) method, the mechanism of the rutile-CaCl 2 phase transition of RuO 2 and the phase stability of β-PtO 2 are investigated. The local density functional calculations predict quantities such as lattice constants, bulk moduli, and phonon frequencies in good…
An optical microscopy study and a micro-Raman spectroscopy study were carried out on polyethylene samples subjected to an environmental stress crack resistance (ESCR) test. The aim was to elucidate the molecular deformation mechanisms associated with the failure process. It has been shown that in the early stages of t…
The epoxidation of trans-cyclooctene (trans-1) with the MTO/H(2)O(2), MTO/UHP, and NaY/MTO/H(2)O(2) oxidants leads to a mixture of trans/cis-olefins 1, trans/cis-epoxides 2, and the cis-diol 3. While the oxygen transfer proceeds stereoselectively, the monoperoxo rhenium complex A, which is generated in situ during the…
Specimens treated with solutions of an epoxy analogue molecule, diethanolamine (DEA), have been studied by X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF−SIMS). The initial substrates were of two different types: grit-blasted aluminum and aluminum coated with an organosi…
We report the first electron paramagnetic resonance studies of single crystals and powders of Pr 0.6 Ca 0.4 MnO 3 in the 300-4.2 K range, covering the charge-ordering transition ( T co ) at ~240 K and antiferromagnetic transition ( T N ) at ~170 K. The asymmetry parameter for the Dysonian single-crystal spectra shows…
The new nonadentate tripodal ligand trenphen (tris[(1,10-phenanthroline-2-carboxamido)-ethyl]amine) has been synthesized by condensation of tren [tris(2-aminoethyl)amine] with an excess of 1,10-phenanthroline-2-carboxylic acyl chloride. The ligand trenphen and its lanthanide complexes (Sm, Nd, Eu, Tb, and Lu) have bee…
We have re-investigated the high pressure behaviour of berlinite AlPO 4 (α-AlPO 4 ) with x-ray diffraction using a powerful synchrotron x-ray source SPring-8. Our results show that it transforms to a crystalline phase beyond ~13 GPa. Our data seem to be consistent with a CrVO 4 type of structure in the Cmcm space grou…
4-Substituted pyridine-2,6-dicarboxylic acids, (E)-dipicH2, and 4-substituted pyridine-2,6-bis(thiocarboxylic) acids, (E)-pdtcH2, (E = OCnH2n + 1, SCnH2n + 1) have been synthesized and used as O,N,O- and S,N,S-pincer ligands with palladium. In the fourth coordination site the complexes bear 4-decyloxy-4'-stilbazole (L…
We study nonaqueous emulsions that are composed of liquid crystal and silicone oils. New surfactant molecules are specifically synthesized to stabilize these emulsions. The behavior of the present surfactants is reminiscent of the behavior of classical surfactants used for aqueous emulsions. Depending on their affinit…
A series of segmented polyurethanes was prepared from the new commercial product KRASOL LBH (linear liquid polybutadiene terminated with secondary hydroxy groups), aromatic diisocyanates, and an aliphatic low-molecular-weight diol. Three types of networks were prepared, with the nature of the crosslinks varied from pu…