Materials Literature
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The entropies of a series of pure-silica molecular sieves (structural codes *BEA, FAU, MFI, and MTT) are obtained by calorimetric measurements of low-temperature heat capacity. The third-law entropies at 298.15 K are (on the basis of 1 mol of SiO 2 ): *BEA, 44.91 ± 0.11 J·K -1 ·mol -1; FAU, 44.73 ± 0.11 J·K -1 ·mol -1…
In the reaction of (η 5 -pentamethylcylopentadienyl)gallium (Cp*Ga) with B(C 6 F 5 ) 3, Ga t Bu 3, and Cp*GaX 2 (X = Cl, I) the new complexes Cp*GaB(C 6 F 5 ) 3, 1, Cp*GaGa t Bu 3, 2, and Cp*GaGa(X) 2 Cp* (X = Cl, 3; I, 4 ), respectively, were obtained. Alternatively, complex 3 was formed in the reaction of Cp*Ga with…
Abstract α,ω‐Dihydroxy‐terminated copolymeric oligomers of a 1,3‐propylene/1,4‐cyclohexanedimethylene succinate structure were obtained by the thermal polycondensation of 1,3‐propanediol/1,4‐cyclohexanedimethanol/succinic acid mixtures. They were subsequently chain‐extended via phosgene synthesis to high molecular wei…
The synthesis of peripherally tetrasubstituted phthalocyanineiron(III) chloride derivatives, (R)4PcFe(III)Cl (R=NO2, NH2, OH. and CN at the positions 2,9,16,23 or 1,8,15,22) is described. The complexes were characterized by magnetic susceptibility measurements, electronic and infrared spectra and X-ray powder diffract…
Sago starch was chemically modified through esterification using 2-dodecen-1-yl succinic anhydride (DSA) and propionic anhydride (PA) and three different solvents: [N,N dimethylformamide (DMF), triethylamine (TEA), and toluene (TOU)]. The effect of reaction times and temperatures on the modification was investigated.…
In the rotational molding of semicrystalline polymers, the slow heating and cooling rates and an almost absence of shear stresses lead to coarse spherulitic morphologies free from molecular orientation. This molding process, which is suitable for short runs of large parts, is not favorable for the dispersion of additi…
Dilatometric measurements in isobaric cooling mode were performed to study the pressure effects on the crystallization kinetics of polypropylene (PP) up to 100 MPa. The experimental specific volume curves were analyzed by taking into account the thermal gradient that appears in the sample even for relatively low cooli…
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Boron-doped highly oriented graphite films (B-HOGF's) with an atomic fraction of boron from 0.4 up to 2.2 at. % have been prepared from well-crystallized, highly oriented graphite. The effect of boron doping on crystal structure has been investigated in terms of texture observation with a field-emission gun-type scann…
The progression of intramolecular organizations within a series of dilute poly(amido amine) (PAMAM) dendrimer/methanol solutions is examined by use of small-angle X-ray scattering (SAXS) combined with comparisons to electron density models and radial density distributions extracted by the indirect transformation for t…
Using Monte Carlo simulations we study crystallization in the three-dimensional Ising model with four-spin interaction. We monitor the morphology of crystals which grow after placing crystallization seeds in a supercooled liquid. Defects in such crystals constitute an intricate and very stable network which separate v…
We present a self-consistent pseudopotential calculation of surface and image-potential states on $MgB_2(0001)$ for both $B$-terminated ($B-t$) and $Mg$-terminated ($Mg-t$) surfaces. We find a variety of very clear surface and subsurface states as well as resonance image-potential states n=1,2 on both surfaces. The su…
We study the dissolution of a solid by continuous injection of reactive ``acid'' particles at a single point, with the reactive particles undergoing biased diffusion in the dissolved region. When acid encounters the substrate material, both an acid particle and a unit of the material disappear. We find that the length…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNH Tautomerism of N-Confused PorphyrinHiroyuki Furuta, Tomoya Ishizuka, Atsuhiro Osuka, Hirohisa Dejima, Hidenori Nakagawa, and Yuichi IshikawaView Author Information Department of Chemistry, Graduate School of Science Kyoto University, Kyoto 606-8502, Japan Department…
We have investigated the anomalous nonlinear microwave response of epitaxial electron-beam coevaporated YBa2Cu3O7-x films on MgO. The power and temperature dependent surface impedance and two-tone intermodulation distortion were measured in stripline resonators at several frequencies between 2.3 and 11.2 GHz and at te…
The physics of soft-matter systems controlled by external fields is reviewed and previewed. Particular emphasis is placed on statistical properties of well-characterized colloidal dispersions in different confining situations, in laser-optical, magnetic and electric fields as well as under shear. These are very active…
Recent experiments on irradiated carbon nanotubes provide evidence that ion bombardment gives rise to nanotube amorphization and dramatic dimensional changes. Using an empirical potential along with molecular dynamics, we study structure and formation probabilities of atomic-scale defects produced by low-dose irradiat…
Based on local-density functional calculations, we study the exchange interactions between magnetic dopants Cr, Mn, and Fe in the III-V compounds GaAs, GaN, and AlN. We show the magnetic exchange interactions deviate strongly in behavior expected from simple models, and may explain the observed maximum in critical tem…
Increasingly stringent legislation controls emissions from internal combustion engines to the point where alternative power sources for vehicles are necessary. The hydrogen fuel cell is one promising option, but the nature of the gas is such that the conversion of other fuels to hydrogen on board the vehicle is necess…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogels for Tissue EngineeringKuen Yong Lee and David J. MooneyView Author Information Departments of Biologic & Materials Sciences, Chemical Engineering, and Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109 Cite this: Chem. Rev. 2001, 101, 7, 1869…