Materials Literature
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Adsorption measurements of CH 4 on catalytically produced carbon nanotubes were used to determine the wetting behavior of the films, the presence of capillary condensation, and the specific surface area of the tubes. Two groups of carbon tubes were produced. The set of larger tubes had inner diameters on the order of…
The first compound for which the previously predicted biaxial nematic phase was claimed is 4-[3,4,5-tris(4-dodecyloxybenzyloxy)benzoyloxy]-4′-(4-dodecyloxybenzoyloxy)-1,1′-biphenyl (I). This assignment was based on the observation of the optical texture and the x-ray diffraction pattern. To confirm this identification…
The changes in solution composition and the stability of a salt film in a 10 mm deep, simulated pit electrode made of nickel in a 0.5 M HCl solution were monitored as a function of applied potential using a 532 nm fiber‐optic Raman system. Raman spectroscopy was able to clearly distinguish dissolved Ni(II)Cl species f…
trans,trans-(tpy)(Cl)2OsII(N2)OsII(Cl)2(tpy) (2) has been prepared by reduction of trans-[OsVI(tpy)(Cl)2(N)]+ (1). The 1-electron oxidation of 2 gives trans,trans-[(tpy)(Cl)2OsIII(N2) OsII(Cl)2(tpy)]+ (3). OsIII−OsII/OsII−OsII and OsIII−OsIII/OsIII−OsII couples appear at +0.21 and +0.77 V vs SSCE in DMF 0.1 M in [N(n-…
Three approaches to the synthesis of a new ligand 1,4,7-tris(carboxymethyl)-10-(1-(hydroxymethyl)-2,3-dihydroxypropyl)-1,4,7,10-tetraazacyclododecane (6) are described. This ligand forms the both thermodynamically and kinetically very stable gadolinium chelate Gadobutrol (1), which is a neutral and highly hydrophilic…
The structural and vibrational properties of the silicon clathrates ${\mathrm{Si}}_{34}$ and ${\mathrm{Si}}_{46}$ are studied using the $O(N)$ tight-binding density-matrix method of Li, Nunes, and Vanderbilt. The elastic moduli are found to be similar to those of cubic-diamond silicon. The large unit cells lead to com…
Poly(acrylic acid) (PAA, a polyelectrolyte brush) was grafted onto a porous glass filter in order to construct a pH-dependent system for the control of liquid permeation. The porous glass filter was treated with octadecyldimethyl( N,N -diethylamino)silane and subjected to glow-discharge treatment to facilitate graft p…
We report Monte Carlo simulations of the nematic-smectic phase transition for a system of hard spherocylinders with infinite length-to-diameter ratio. A finite-size scaling analysis suggests that this system undergoes a first-order phase transition. When combined with other simulations of the phase behavior of spheroc…
Monte Carlo (MC) simulations based exclusively on nearest-neighbor intermolecular interactions reveal the existence of stable long-range deformations and topological defects in a thin nematic film confined between two surfaces with antagonistic (normal and tangential) molecular orientations. Thus the MC technique allo…
We have developed a new compact retarding-potential Mott spin polarimeter and achieved an efficiency of 1.9×10−4 for gold target operating in 25 keV. A novel design of the retarding field electron optics with 0.59 sr collection solid angle for scattered electrons was adopted based on Monte Carlo calculations for the s…
4-Hexadecyloxyphenyl-4-substituted benzoates, Ia-d, and 4-substituted phenyl-4- hexadecyloxy benzoates, IIa-d, with the substituents CH3O, Cl, CN, and NO2, respectively, were prepared and characterized by infrared spectroscopy and the apparent solution dipole moment measured using cyclohexane as a solvent. Smectic A m…
Soluble polypyrrole (PPy) with high conductivity (27 S/cm) has been prepared by chemical polymerization of pyrrol monomer in the presence of β-naphthalene sulphonic acid (NSA) as a dopant. The solubility of the resulting conducting polymer of PPy-NSA in m-cresol increases with increasing the concentration of NSA in th…
2-Aza-21-carba-5,10,15,20-tetraarylporphyrin (CTPPH 2, inverted porphyrin) and its methylated derivatives, acting as ligands, can be structurally related to the following hypothetical tautomers: 2-aza-5,10,15,20-tetraphenyl-21-carbaporphyrin (2-NH-CTPPH); 2-aza-5,10,15,20-tetraphenyl-21-methyl-21-carbaporphyrin (21-H-…
Article A rational approach to the mechanisms of incrustation inhibition by polymeric additives / Wirkungsweise von polymeren Inkrustrationsinhibitoren was published on December 1, 1997 in the journal Tenside Surfactants Detergents (volume 34, issue 6).
We investigate the compatibilizing performance of a random copolymer in the melt state, using transmission electron microscopy. Blends of polystyrene (PS) and poly(methyl methacrylate) (PMMA) are chosen as a model system, and a random copolymer of styrene and methyl methacrylate (SMMA) with 70 wt % styrene is used as…
Ceramic samples of Ce 1− x Gd x O 2− y and yttria‐stabilized zirconia (YSZ) were prepared using solid‐state methods. Polished faces of disks of these materials were held in intimate contact in a reaction cell at temperatures ranging from 1000° to 1300°C for durations up to 72 h. XRD, SEM, and microprobe Raman techniqu…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTDivergent/Convergent Joint Approach with a Half-Protected Initiator Core To Synthesize Surface-Block DendrimersKeigo Aoi, Katsuhito Itoh, and Masahiko OkadaView Author Information Department of Applied Biological Sciences, Faculty o…
The corrosion behavior and strength degradation of alumina ceramics with 99%, 99.9%, and 99.99% Al 2 O 3 were studied in water at 300°C and 8.6 MPa for 1 to 10 d. The weight loss in alumina ceramics was mainly attributed to the dissolution of SiO 2 and Na 2 O grain‐boundary impurities. Intergranular corrosion proceede…
Fiber pushout tests were used to quantify the effects of fiber coating thickness on the mechanical properties of two model composite systems: a monazite‐coated (LaPO 4 ‐coated) alumina (Al 2 O 3 ) fiber in an Al 2 O 3 matrix and a LaPO 4 ‐coated yttrium aluminum garnet (YAG) fiber in an Al 2 O 3 matrix. Interface prop…
A model asphalt has been separated into two parts, asphaltene and maltene, through solvent extraction by n-heptane. The interactions of asphaltene and maltene with the triblock copolymer poly(styrene-b-(ethylene-co-butylene)-b-styrene) (SEBS) were investigated by transmission electron microscopy (TEM), small-angle X-r…