Materials Literature
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Unrestricted Hartree-Fock calculations on ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ $(x=0.5$ and $x=0.67)$ in the full magnetic unit cell show that the magnetic ground states of these compounds consist of ``ferromagnetic molecules'' or polarons ordered in herring-bone patterns. Each polaron…
Abstract The cyclic phosphorous group, 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide‐10‐yl (DOPO), attached on a polyamide PA–DOPO could be hydrated to give its open‐chained form with phosphinic acid groups (PA–DOPO–HD). The open‐chained phosphinic acid groups could be reformed to its cyclic DOPO form through the…
Abstract Polymerization of benzoguanamine (BGA) and 2,4‐tolylenediisocyanate (TDI), BGA–TDI polycondensation polyurea (PU), and pyromellitic dianhydride (PMDA) in solid phase under microwave radiation was studied. In the system of TDI and BGA, the effect of microwave radiation time, the composition and concentration o…
A new integrated electrochemical and transmission optical microscopy approach is presented which allows for elucidation of inhomogeneous ion/charge-transfer behavior in polycrystalline electrochromic/insertion materials. Spatially resolved Li+ diffusion coefficients and ionic conductivities are determined from the tim…
An in situ study of solution crystallization kinetics and morphology of the long alkane n -C 246 H 494 has been performed by interference optical microscopy using a T -jump hot stage. The crystallization temperatures ( T c ) covered the full range of extended-chain and part of the once-folded chain range. A drastic ch…
Taking advantage of the weak attraction forces between gold surface and silica zeolite colloids, selective growth of zeolite on silicon wafer over gold was exploited to fabricate continuous micropatterned b-oriented zeolite MFI monolayer film with excellent adhesion.
Numerical simulations are conducted to calculate velocity fluctuations in a simple two-dimensional model of foam under steady shear. The width of the velocity distribution increases sublinearly with the shear rate, indicating that velocity fluctuations are large compared to the average flow at low shear rates (stick-s…
We propose that silica glass exists in a special intermediate state for pressures between \ensuremath{\sim} 3 and 5 GPa, which can be identified as an analogue of the ``reversibility window'' observed in chalcogenide glasses. In this state there is a gradual reduction of the degree of low-energy flexibility of the str…
Electrochemical deposition of metals from the H 1 hexagonal phase of nonionic lyotropic liquid-crystalline phases has been shown to produce films which contain regular arrays of uniform pores whose dimensions are determined by those of the micelles in the lyotropic phase used as the template. In this paper we report r…
Polyaniline:2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid has been wet‐spun to yield hollow fibers using dichloroacetic acid as the solvent. The fibers have excellent circular cross‐sections and good surface morphology, as can be seen from the Figure. The permeability of the fibers, as suitable for gas separation, has…
Abstract The effects of polypropylene (PP) and ultrasonic irradiation on the processing and mechanical properties of ultrahigh molecular weight polyethylene (UHMWPE) are studied. The results show that PP can effectively improve the fluidity and mechanical properties of UHMWPE. The Izod notched impact strength increase…
Single crystals of ${\mathrm{GdBaCo}}_{2}{\mathrm{O}}_{5.5}$ layered perovskites have been grown from a flux melt of ${\mathrm{Gd}}_{2}{\mathrm{O}}_{3}\ensuremath{-}\mathrm{BaO}\ensuremath{-}\mathrm{CoO}$ oxides. Magnetic data showed that the ${\mathrm{GdBaCo}}_{2}{\mathrm{O}}_{5.5}$ single crystals exhibit a magnetic…
Abstract Block copolymers of polycarbonate‐ b ‐poly(methyl methacrylate) (PC‐ b ‐PMMA) and tetramethyl poly(carbonate)‐ b ‐poly(methyl methacrylate) (TMPC‐ b ‐PMMA) were examined as compatibilizers for blends of polycarbonate (PC) with styrene‐ co ‐acrylonitrile (SAN) copolymer. To explore the effects of block copolym…
Abstract Polyaryloxydiphenylsilanes were prepared from phosphorus‐containing diols and diphenydichlorolsilane through solution polymerization. With a stoichiometric imbalance in feed monomers, the resulting polymers exhibited moderate melting points and good processing properties. The polymers prepared showed initial…
Abstract Poly(2‐aminobenzoic acid) and poly(3‐aminobenzoic acid) were synthesized by chemical polymerization of the respective monomers with aqueous 1 M hydrochloric acid and 0.49 M sodium hydroxide, using ammonium persulfate as an oxidizing agent. In addition, polymerization in an acid medium was carried out in the p…
X-ray absorption fine structure spectroscopy (XAFS), a powerful tool for the study of the local environment of a particular element, especially the luminescent center, was introduced to investigate the correlation between luminescent properties and local structure around Eu 3+ ions in YBO 3:Eu nanocrystals, which was…
A novel nanoporous carbon−silica composite with medium hydrophilicity is synthesized by a series of methods consisting of preexpansion of the interlayer of graphite oxide (GO) by surfactant intercalation, the intercalation of tetraethoxylsilane (TEOS) and its hydrolysis in the interlayer, followed by post carbonizatio…
Abstract Surface imide hydrolysis of Kapton HN polyimide films in a 1 M KOH aqueous solution was studied using dynamic contact angle measurements, X‐ray photoelectron spectroscopy (XPS) and time‐of‐flight secondary ion mass spectrometry (TOF‐SIMS). The surface energy of Kapton HN increased quickly upon KOH treatment d…
The electrochemical and optical properties of films prepared from two different Fe(II) coordination polymers (TPT[Fe(II)TPT](n)(PF(6))(2)(n) (TPT = terpyridine-phenyl-terpyridine) and CTPCT[Fe(II)CTPCT](n)(PF(6))(2)(n) (CTPCT = chiral terpyridine-phenyl-chiral terpyridine)) and a coordination polymer based on Cu(I) me…
An initiator was intercalated into the interlayer spacings of montmorillonite clay, from which poly(styrene-block-butyl acrylate) silicate nanocomposites were prepared using atom transfer radical polymerization. A mixture of exfoliated structure and intercalated structure was produced in the nanocomposite. The poly(bu…