Materials Literature
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Single walled carbon nanotubes (SWNTs) were dispersed in isotropic petroleum pitch matrices to form nanotube composite carbon fibers with enhanced mechanical and electrical properties. We find that the tensile strength, modulus, and electrical conductivity of a pitch composite fiber with 5 wt % loading of purified SWN…
A series of [net-polystyrene]-ipn-[net-poly(methyl acrylate)] systems with gradients of poly(methyl acrylate) in a polystyrene matrix are prepared and tested mechanically. The results showed no distinct differences from that of corresponding interpenetrating polymer network (IPN) samples with similar compositions, in…
Kapton film, poly[(N,N′-oxydiphenylene)pyromellitimide], was modified by silane-coupling reactions using 3′(trimethoxysilyl)propoxy-2-hydroxypro-pyl-1,3-diazole (Si–imidazole) to improve the adhesion with copper metal. The Kapton film surface was first treated with argon plasma for 30 s, then dipped into a methanol so…
New Sm(III) μ-halo-bis(trimethylsilyl)amido complexes [Sm(μ-X) {N(SiMe3)2}2(THF)]2 (X = Cl, Br) were synthesized and their crystal structures were analyzed. These complexes were used as catalysts for the homopolymerization of ε-caprolactone and δ-valerolactone and found to initiate ring-opening polymerization (ROP) of…
A remelting–restabilization technique was applied for the recycling of postused, yellow-pigmented high-density polyethylene (HDPE) bottle crates. Multiple extrusion cycles procedure, at different reprocessing temperatures, was performed for monitoring the processing stability of the restabilized and nonrestabilized ma…
Wetting behavior of perfluoroalkylethyl acrylate (FA)/n-alkyl acrylate (AA) copolymers with the various length of side chains of the AAs is discussed from a standpoint of surface molecular mobility. The copolymerization reactivity ratio indicates that these polymers are random copolymers. The surface properties were s…
A microscopic theory for the NMR anomalies of the planar Cu and O sites in superconducting La_1.85Sr_0.15CuO_4 is presented that quantitatively explains the observations without the need to invoke anit-ferromagnetic spin fluctuations on the planar Cu sites and its significant discrepancy with the observed incommensura…
We have studied an anomalous microwave (mw) response of superconducting YBa_{2}Cu_{3}O_{7-delta} (YBCO) microstrip resonators in the presence of a weak dc magnetic field, H_{dc}. The surface resistance (R_{s}) and reactance (X_{s}) show a correlated non-monotonic behaviour as a function of H_{dc}. R_{s} and X_{s} were…
The selection and modification of atoms or functional groups underly many of the manipulations central to molecular modeling. It has become even more important to automate these tasks with the current prevalence of work with large databases of molecules. We have devised SUPER-SMILES, a conceptually simple set of exten…
Heat-induced interfacial aggregation of a whey protein isolate (WPI), previously adsorbed at the oil-water interface, was studied by interfacial dynamic characteristics coupled with microscopic observation and image analysis of the drop after heat treatment. The experiments were carried out at temperatures ranging fro…
Elemental sulfur exists in many crystalline forms, with many of these forms being composed of discrete S n cyclic molecules. Eleven experimentally determined S n crystal structures are used to define a new spherical S···S intermolecular force field of the (exp-6) type. Evidence is presented that the bonded sulfur atom…
The new compounds, RbU 2 SbS 8 and KU 2 SbSe 8, were prepared as golden-black, blocklike crystals by the polychalcogenide molten flux method. RbU 2 SbS 8 crystallizes in the monoclinic space group Cm with a = 7.9543(9) Å, b = 11.0987(13) Å, c = 7.2794(10) Å, β = 106.030(2)°, and Z = 2. The compound has a two-dimension…
To study the freezing/melting behavior of a confined CH 3 Cl, we performed X-ray diffraction measurements of CH 3 Cl confined inside the cylindrical pores of six kinds of siliceous MCM-41 with different pore radii ( R = 1.2−2.9 nm) as a function of temperature. The pore-size dependence of the phase-transition temperat…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorTelechelic Syntheses of the First Phosphazene Siloxane Block CopolymersRobbyn Prange and Harry R. AllcockView Author Information Department of Chemistry, The Pennsylvania State University, 152 Davey Laboratory, University Park, Pennsylv…
Two luminescent triangle and square complexes with the general formulas [ClRe(CO)3(μ-DPB)]4 (1) and [BrRe(CO)3(μ-BPDB)]3 (2), where DPB = 4,4‘-dipyridylbutadiyne and BPDB = 1,4-bis(4‘-pyridylethynyl)-2,5-dihexyloxybenzene, were prepared by self-assembly reactions of XRe(CO)5 (X = Cl or Br) and the corresponding bis-mo…
Additional experiments have shed new light on the phenomenon reported by one of us and L. Farber (Reports, 7 May, p. [937][1]). The fabrication details of the porous samples examined in this work, Ti2GaN, TiGa3, and FeGa3, are described elsewhere ([1][2]). X-ray diffraction of the samples indicated that they were pred…
In this study, a new preparation method of hydroxy double salts (HDSs) including organic compounds between layers has been established in which the HDSs were prepared by reacting ZnO with organic metal salts in water. This method does not need an anion-exchange reaction to incorporate organic compounds into the HDS la…
An organometallic colloidal route was employed to prepare orange fluorescing Mn 2+ functionalized ZnS and CdS particles. For this purpose, tributylphosphine-capped manganese oxide clusters were first synthesized, which served as heterogeneous nucleation centers in the ZnS condensation process. An exposure of the resul…
We present an analytic simplified form for the 4 × 4 propagation matrix of a general homogeneous biaxial layer. The expression is applicable to any linear homogeneous, absorbing, biaxial, gyrotropic, magneto-optic, arbitrarily oriented anisotropic structure. Its simple form speeds up the calculation of the optical pro…
Experimental data for the supercritical CO(2) extraction of purine alkaloids (caffeine, theobromine, and theophylline) from ground herbal maté tea (Ilex paraguaryensis) using a high-pressure apparatus are presented. Caffeine, theophylline, and theobromine were identified in the extracted fractions using HPLC. Results…