Materials Literature
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A purification method is given for extracting the Fe metal catalyst and non-SWNT carbon from nanotubes produced by the HiPco process.(1,2) A multistage purification method has been investigated. Sample purity is documented by ESEM, TEM, TGA, Raman and UV-vis-near-IR spectroscopy. Metal catalyzed oxidation at low tempe…
This study introduces a new approach for producing highly monosized polymer microcapsules. The technique employs an impressive process in which the solute, dissolved freely in a solvent, is diffused uniformly into the preexisting monosized polymer particles in the form of a fine emulsion. The solvent is then eliminate…
It is shown how non-resonant and resonant inelastic x-ray scattering spectroscopy (IXSS) offer valuable information about electronic excitations in solids. After a presentation of the basic relations, applications of IXSS on a large variety of systems and electronic excitations are discussed, where in most cases synch…
Single-crystalline photochromism of 1,2-bis(2-methyl-5-phenyl-3-thienyl)perfluorocyclopentene 1a was followed in situ by X-ray crystallographic analysis. The crystal of 1a has two molecules with different conformations in the crystallographic asymmetric unit. The X-ray analysis of the photoirradiated crystal showed th…
Abstract Novel poly(ethylene terephthalate) (PET) copolyesters, abbreviated PEDMBT, containing optically active (2 S ,3 S )‐2,3‐dimethoxy‐1,4‐butanediol (DMBD) as the second comonomer were investigated. Copolymers with ethylene glycol to DMBD ratios between 95/5 and 50/50 as well as the two parent homopolymers, PET an…
This article aims at a simple introduction to the structure, properties and usefulness of quasicrystals. Since space is limited, the reader will essentially find a selection of references that may be used to obtain better insight into this rather new part of materials science.
Orange crystals of Cs(4)Th(4)P(4)Se(26) were grown from the reaction of (232)Th and P in a Cs(2)Se(3)/Se molten salt flux at 750 degrees C. Cs(4)Th(4)P(4)Se(26) crystallizes in the orthorhombic space group Pbca with the unit cell parameters: a = 12.0130(6), b = 14.5747(7), c = 27.134(1) A; Z = 8. The compound exhibits…
Techniques of containerless processing are applied to undercool and solidify metals and alloys. These techniques allow direct measurements of both the undercooling and the crystal growth velocity. Experimental results are presented for studies of nucleation of metastable crystalline phases and quasicrystals. Measureme…
This book is aimed at scientists and engineers wanting to use radioisotopes and the emitted ionising radiations competently but without seeking expertise. It describes decay and stability criteria, necessary precautions to ensure radiation protection and the detection of alpha, beta and gamma rays including spectromet…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXT34π Octaphyrin: First Structural Characterization of a Planar, Aromatic [1.0.1.0.1.0.1.0] Octaphyrin with Inverted Heterocyclic RingsVenkataramanarao G. Anand, Simi K. Pushpan, Sundararaman Venkatraman, Abhishek Dey, Tavarekere K. Chandrashekar, Bhavani S. Joshi, Raja…
X-ray scattering measurements of the low-temperature structure of La(1-x)Sr(1+x)MnO(4) ( 0.33< or =x< or =0.67) indicate the existence of three distinct regions: a disordered phase (x<0.4), a charge-ordered phase (x> or =0.5), and a mixed phase (0.4< or =x<0.5). For x>0.5, the modulation vector associated with the cha…
EXAFS (extended x-ray absorption fine structure), besides being a powerful structural probe, can also give original information on local dynamics in solids. EXAFS is peculiarly sensitive to the correlation of vibrational motion, both parallel and perpendicular to the bond direction, and to anharmonicity. This paper co…
[structure: see text]. Macromolecules 1c and 2c bearing multiple redox-active sites are synthesized by an efficient palladium-catalyzed coupling of 2,5-dimethoxytolylmagnesium bromide with readily available hexakis(4-bromophenyl)benzene and tetrakis(4-bromophenyl)methane. These macromolecular electron donors undergo r…
Methods are reported for the preparation of mixed-carboxylate versions of the [Mn(12)O(12)(O(2)CR)(16)(H(2)O)(4)] family of single-molecule magnets (SMMs). [Mn(12)O(12)(O(2)CCHCl(2))(8)(O(2)CCH(2)Bu(t))(8)(H(2)O)(3)] (5) and [Mn(12)O(12)(O(2)CHCl(2))(8)(O(2)CEt)(8)(H(2)O)(3)] (6) have been obtained from the 1:1 reacti…
ADVERTISEMENT RETURN TO ISSUEPREVLetterNEXTBinding of an Anti-Fullerene IgG Monoclonal Antibody to Single Wall Carbon NanotubesBernard F. Erlanger, Bi-Xing Chen, Min Zhu, and Louis BrusView Author Information Microbiology Department, 701 West 168 Street, Columbia University, New York, New York 10032, and Chemistry Dep…
The current work reports on the elastic shear moduli, internal friction, and the specific heat of the B2 cubic ordered alloy AuZn as a function of temperature. Measurements were made on single-crystal and polycrystalline samples using Resonant Ultrasound Spectroscopy (RUS), semi-adiabatic calorimetry and stress-strain…
Magnetic, linear thermal expansion (LTE), anisotropic ($λ_t$) and volume ($ω$) magnetostriction properties of Pr$_{0.5}$Sr$_{0.5}$MnO$_3$ were investigated. The LTE decreases smoothly from 300 K without a clear anomaly either around the Curie (T$_C$ = 270 K) or the Neel temperature (T$_N$ = 100 K) and it exhibits hyst…
Photocatalysts involving titanium oxides were prepared by an ion-exchange and impregnation method in which zeolites with different Si/Al ratios were used as supports. Those photocatalysts with low Si/Al ratios exhibited high and unique photocatalytic reactivity for the direct decomposition of NO into N 2, O 2, and N 2…
A first-principles derived approach is combined with the inverse Monte Carlo technique to determine the atomic orderings leading to prefixed properties in Pb(Sc(0.5)Nb(0.5))O(3) perovskite alloy. We find that some arrangements between Sc and Nb atoms result in drastic changes with respect to the disordered material, i…
Wurtzite (Ga,Mn)N films showing ferromagnetic behaviour at room temperature were successfully grown on sapphire(0001) substrates by molecular beam epitaxy using ammonia as nitrogen source. Magnetization measurements were carried out by a superconducting quantum interference device at the temperatures between 1.8K and…