Materials Literature
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The reaction of CuCl 2 ·2H 2 O and Na 2 C 4 H 2 O 4 (disodium fumarate) in dilute ammonia solution produces 1-D polymeric chain [Cu(μ-C 4 H 2 O 4 )(NH 3 ) 2 ] n (H 2 O) n . The crystal structure of the compound has been solved. The compound crystallizes in the monoclinic system, space group C 2/ m (No. 12), with chemi…
Anomeric equilibrium isotope effects for dissolved sugars are required preludes to understanding isotope effects for these molecules bound to enzymes. This paper presents a full molecule study of the alpha- and beta-anomeric forms of D-glucopyranose in water using deuterium conformational equilibrium isotope effects (…
The graft copolymerization of acrylonitrile and ethyl methacrylate from their binary mixtures onto cellulose has been carried out in the presence of Ce(IV) ions in acidic media at 30 +/- 0.1 degrees C. The graft copolymerization has shown an increasing trend on increasing the feed molarity of the comonomers and on inc…
Two porphyrin-based optoelectronic gates and several prototypical redox-switching components of gates have been synthesized for studies in molecular photonics. Linear and T-shaped molecular optoelectronic gates contain a boron-dipyrrin (BDPY) dye as the input unit, a zinc (Zn) porphyrin as the transmission unit, a fre…
Three-dimensionally ordered macroporous (3DOM) silica materials functionalized with highly dispersed polyoxometalate clusters have been prepared via direct synthesis. Lacunary γ - decatungstosilicate clusters were incorporated into the wall structures of macroporous silica by reaction of the clusters in acidic solutio…
It is shown that the experimental results reported in cond-mat/0010412 do not invalidate the well-known expression for the Kelvin force density in ferrofluids.
We have applied the Ewald-Kornfeld formulation to a tetragonal lattice of point dipoles, in an attempt to examine the effects of geometric anisotropy on the local field distribution. The various problems encountered in the computation of the conditionally convergent summation of the near field are addressed and the me…
We review microstructural fracture growth models suitable for the study of hydraulic fracture processes in disordered porous materials and present some basic results. It is shown that microstructural models exhibit certain similarities to corresponding theories of continua. These similarities are most easily demonstra…
We consider a two-particle system in which a particle is held fixed, and the other one rotates around the axis perpendicular to the line joining the particles centers. The rotating particle leads to a displacement of its polarization charge on the surface. Our results show that the rotational motion of the particles g…
The partially disentangled poly(vinyl chloride) (PVC) samples were prepared by freeze-extracting from dilute PVC/THF solutions. The conformation of these samples was investigated by infrared and Raman spectroscopy. The structural relaxation behaviors were studied by differential scanning calorimeter (DSC). The results…
A L-phenylalanlylglycylglycine- (H-L-PheGlyGly-) terminated polyrotaxane in which many alpha-cyclodextrins (alpha-CDs) are threaded onto poly(ethylene oxide) (PEO) was synthesized to evaluate the effect of alpha-CD threading on the degradation of the terminal H-L-PheGlyGly by a membrane-bound metalloexopeptidase (amin…
Temperature dependencies of the dc electrical resistivity, dc magnetization, and heat capacity of virgin ${\mathrm{Gd}}_{5}{(\mathrm{S}\mathrm{i}}_{1.95}{\mathrm{Ge}}_{2.05})$ samples and after they had been cycled through the first-order phase transition by varying temperature or magnetic field were studied. The virg…
A vibrational study of the polymer electrolyte compound poly(ethylene oxide) 6:LiAsF 6 is reported. A symmetry-based factor group correlation method is applied to interpret the observed bands. The Raman and infrared spectra of the compound are consistent with the reported crystal structure. The ν 1 mode, which appears…
The magnetic molecule Fe${}_{8}$ has a rich pattern of degeneracies in its magnetic spectrum as the static magnetic field applied to it is varied. The points of degeneracy, or diabolical points in the magnetic field space, are found exactly in the simplest model Hamiltonian for this molecule. They are shown to form a…
The contact angle between a free standing film of a smectic-A liquid crystal and its meniscus is different from zero. It increases independently of the meniscus size when the film thickness decreases. This angle provides a very precise measurement of the film tension and of the interactions between the two free surfac…
A series of calcined borosilicate molecular sieves are treated hydrothermally with aqueous acetic acid and subsequently characterized in detail. The acid treatments are shown to expel boron from the molecular sieves, and the defects created by the boron removal are subsequently healed with silicon dissolved from other…
A cyclen (=1,4,7,10-tetraazacyclododecane) doubly functionalized with three carbamoylmethyl groups and one dansylaminoethyl (dansyl = 2-(5-(dimethylamino)-1-naphthalenesulfonyl) group (L(2) = 1-(2-(5-(dimethylamino)-1-naphthalenesulfonylamido)ethyl)-4,7,10-tris(carbamoylmethyl)-cyclen) was synthesized and characterize…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTControlled Placement of Luminescent Molecules and Polymers in Mesostructured Sol−Gel Thin FilmsRaquel Hernandez, Anne-Christine Franville, Payam Minoofar, Bruce Dunn, and Jeffrey I. ZinkView Author Information Department of Chemistry and Biochemistry University of Cali…
Electrochemical lithium doping into carbon electrodes consisting of multiwalled carbon nanotubes produced by catalytic decomposition of acetylene has been carried out in button cells. Direct observation of the sample by low- and high-resolution transmission electron microscopy reveals that the lithium species are not…
With a spatial correlation model, a simple method was established to evaluate the crystallinity and stress of cubic boron nitride (cBN) films from the variation of linewidth and peak shift of Raman spectra. An increase of crystallinity and a decrease of stress of the cBN films with growth time were demonstrated. As a…