Materials Literature
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The multiwavelength anomalous diffraction (MAD) method for phase evaluation is now widely used in macromolecular crystallography. Successful MAD structure determinations have been carried out at the K or L absorption edges of a variety of elements. In this study, we investigate the anomalous scattering properties of u…
The photoreaction of xanthone in an alcoholic solution flowing through a column reactor filled with the mesoporous silica MCM-41 was performed. It was found that the product yields depend greatly on both the pore size of the filler and the nature of the solvent. The product yields of this reaction, which involves a pa…
Abstract A complex of trivalent lanthanum stearate with stearin (REC) was used as a surface modifier to treat calcium carbonate, and its efficacy was assessed. The measurement of the viscosity of a CaCO 3 /liquid paraffin suspension demonstrated that REC treatment could considerably improve the dispersion of filler in…
Mode contributions of different collective excitations to the density-density time correlation function in liquid lead are studied within the nine-variable approach of generalized collective modes. It is shown, that a kinetic relaxing mode, caused by slow density fluctuations, defines almost completely the shape of de…
The structures of a series of strained in -cyclophanes, for which good X-ray data are available, were calculated by using a variety of ab initio and hybrid density functional (HDFT) methods. The HDFT methods were found to overestimate systematically the transannular nonbonded contact distances in these molecules. A co…
Abstract The effect of sodium carbonate on the Mooney scorch time and cure index of epoxidized natural rubber (ENR 50) was studied with concentrations of 0–2 phr and 100–160°C temperatures. A conventional vulcanization system based on an ASTM formulation was used throughout the investigation on the gum and carbon blac…
Abstract Blends of poly(ethylene terephthalate) (PET) and high‐density polyethylene (HDPE) with and without a compatibilizing agent were studied. Both materials are widely used in the soft drink bottle industry. The compatibilizing agent was a copolymer of ethylene and methacrylic acid partially neutralized with zinc…
We report structural, magnetic, and magnetotransport properties of the two-dimensional chromium sulfide ${\mathrm{Cr}}_{2}{\mathrm{S}}_{2.92},$ which contains both ${\mathrm{Cr}}^{3+}$ and ${\mathrm{Cr}}^{2+}$ ions. Below its magnetic-ordering temperature ${(T}_{N}=118 \mathrm{K}),$ ${\mathrm{Cr}}_{2}{\mathrm{S}}_{2.9…
Abstract Random copolymer layers are surprisingly effective at reinforcing polymer–polymer interfaces. One hypothesis is that composition drift during synthesis can account for the higher than expected toughening. To test this hypothesis, we polymerized a series of poly( d ‐styrene‐ r ‐2‐vinylpyridine) (dPS f ‐ r ‐PVP…
A single crystal of gadolinium-doped SmAl(2) has zero magnetization in the midst of the ordered temperature region, despite the probable ferromagnetic spin ordering. The asymmetry in Compton-scattering intensity when switching between right- and left-handed polarization of incident 150-keV synchrotron radiation provid…
An adaptation of the Brownian dynamics simulation method has been used to model the growth of a particular 200-particle ensemble of silver nanoparticles. This ensemble of particles was randomly positioned on an electrode of total area 1.0 × 10 -9 cm 2, and these particles possessed a significant size distribution. The…
An Imaging-Plate (IP) camera for X-ray powder diffraction (XRPD) experiments was installed on the synchrotron radiation beamline GILDA at the ESRF. The IP camera can be used in fixed data-collection mode of the whole diffraction rings, or in translation mode for time-dependent experiments. The apparatus is ideal for c…
A series of polybutadiene “combs” with polydispersities less than 1.2 have been synthesized using anionic polymerization techniques. Control was exerted over the average number and length of branches but not on their placement along the polybutadiene backbone. Hydrogenation of the materials resulted in the formation o…
Abstract The graft copolymerization of methyl methacrylate (MMA) onto sago starch was carried out in aqueous media by different initiators of ceric ammonium nitrate (CAN) and potassium persulfate (PPS) and under a nitrogen gas atmosphere. Using CAN as an initiator, the maximum percentage of grafting (% G ) was ascerta…
A new set-up and associated methodology for the collection of angle-dispersive diffraction data from protein crystals submitted to high hydrostastic pressure have been developed on beamline ID30 at the ESRF. The instrument makes use of intense X-rays of ultra-short wavelength emitted by two collinear undulators, and c…
Graphite is an important material for use as a solid lubricant that works even at high temperatures. Generally, the reason for the lubricity is that carbon layers easily slide against each other due to the layered structure with weak interlayer interaction. However, the atomic nature of the interlayer interaction is s…
Abstract Capacitors with an Al–polyimide–Al sandwich film structure have been fabricated: the top and the bottom aluminium electrodes were deposited by vacuum evaporation and the polyimide film was deposited by an isothermal immersion method. An X‐ray diffractogram of the film indicates the amorphous nature of the pol…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis of the First Corrolazine: A New Member of the Porphyrinoid FamilyBobby Ramdhanie, Charlotte L. Stern, and David P. GoldbergView Author Information Department of Chemistry, The Johns Hopkins University Baltimore, Maryland 21218 X-ray Crystallography Facility,…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMetal-Assisted Organization of Shortened Carbon Nanotubes in Monolayer and Multilayer Forest AssembliesDebjit Chattopadhyay, Izabela Galeska, and Fotios PapadimitrakopoulosView Author Information Nanomaterials Optoelectronics Laboratory Department of Chemistry, Polymer…
We describe how sp(2) carbon, threefold coordinated by other carbons, can be replaced by sp(3) carbon, also threefold carbon coordinated, to produce extremely small-diameter ( approximately 0.4 nm) carbon nanowires with only minimal bond-angle distortion. Under a naming convention analogous to that for ordinary carbon…