Materials Literature
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It has been shown that the monoclinic β ‐phase of dicalcium silicate (Ca 2 SiO 4 ) can be stabilized against transformation to the orthorhombic γ ‐phase by physical rather than chemical factors. Stabilization was studied in different types of microstructures fabricated under various processing conditions such as diffe…
Abstract Results of large‐scale finite element computations are presented for the problem of borehole failure due to the high stresses at great depths. Rock is modelled by an extension of the Mohr–Coulomb flow theory of plasticity for material with Cosserat micro‐structure. The introduction of internal length (grain s…
The crystal structures of synthetic pyrope (Mg3AI2Si3012),almandine (FeAI2Si3012), and the solid-solution garnet compositions PY8o-Alm2o, PY6o-Alm4o, and PY2o-Alm8o have been refined in space group Ia1d from high-precision X-ray diffraction data with sin 0/>..> 0.4 A-I measured at 100 and 293 K. There is no indication…
Abstract Austenitic stainless steels (Fe–19Cr–10Ni (at.%)) have been implanted with molybdenum ions (Mo + , 100 keV, 2.5 × 10 16 atoms cm −2 ). The implanted material has been characterized by XPS and RBS. The implanted region has a thickness of ∼1000 Å with a maximum molybdenum concentration of ∼9 at.% Mo located at…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination compounds of polyoxovanadates with a hexametalate core. Chemical and structural characterization of [VV6O13[(OCH2)3CR]2]2-, [VV6O11(OH)2[(OCH2)3CR]2], [VIV4VV2O9(OH)4[(OCH2)3CR]2]2-, and [VIV6O7(OH)6](OCH2)3CR]2]2-Qin Chen, David P. Goshorn, Charles P. Scholes,…
Reduction of protein adsorption by coating surfaces with polyethylene glycol (PEG) is well documented. The present work has four goals related to these previous studies: first, to develop chemistry providing densely packed, covalently bound PEG on polystyrene (PS); second, to determine the ability of these modified su…
Abstract Mixed-layer illite-smectites (I-S) have a stable charge on the illite interlayer equal to 0·89/O 10 (OH) 2 , as shown by electron microscope measurements of mean fundamental particle thickness, using both Pt-shadowing and high-resolution techniques. This has been verified by independent measurements of total…
A computer program has been written to introduce profile analysis into the Rietveld method. The devised algorithm simultaneously refines both structural and microstructural parameters, also accounting for anisotropy in crystallite size and microstrain. Instead of using phenomenological relations to describe the trend…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo-step spin crossover in the new dinuclear compound [Fe(bt)(NCS)2]2bpym, with bt = 2,2'-bi-2-thiazoline and bpym = 2,2'-bipyrimidine: experimental investigation and theoretical approachJose Antonio Real, Helene Bolvin, Azzedine Bousseksou, Ary Dworkin, Olivier Kahn, Franco…
The anomalous low-energy vibrational behaviour exhibited by amorphous solids (a peak in the vibrational density of states, in C v / T 3 and in the Raman spectrum–the boson peak–and a plateau in the thermal conductivity) is ascribed to the phonon scattering caused by intrinsic density fluctuation domains in the structu…
Our earlier theoretical analysis suggested that the quantum efficiency of photoassisted oxidation of organic compounds in water by O2 on n-TiO2 surfaces can be limited by the kinetics of the reduction of O2. When the rate of O2 reduction is not sufficiently fast to match he rate of reaction of holes, an excess of elec…
The propagation of laser ablation plumes from 248 nm laser-irradiated YBCO into vacuum and 100 mTorr ambient oxygen has been photographed with a gated, intensified CCD array camera system. The thermalization of the laser plasma and onset of shock structures due to collisions with the background gas are investigated fr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn situ Raman spectroscopy of alumina-supported metal oxide catalystsMichael A. Vuurman and Israel E. WachsCite this: J. Phys. Chem. 1992, 96, 12, 5008–5016Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https:/…
Use of polymeric drug delivery systems is rapidly becoming an established approach for improvement of cancer chemotherapy. Zoladex, a poly lactide-co-glycolide subcutaneous implant that delivers a luteinizing hormone releasing hormone analog over 28 days, is now the treatment of choice for prostate cancer, and a polya…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFailure mechanisms of polymer interfaces reinforced with block copolymersCostantino Creton, Edward J. Kramer, Chung Yuen Hui, and Hugh R. BrownCite this: Macromolecules 1992, 25, 12, 3075–3088Publication Date (Print):June 1, 1992Publication History Published online1 May 2002…
The experimental setup for the implementation of a new technique to determine the hyperpolarizability of nonlinear optical molecules in solution is presented. The new technique, hyper-Rayleigh scattering in solution [K. Clays and A. Persoons, Phys. Rev. Lett. 66, 2980 (1991)], has the advantage over the electric-field…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSemiconductor nanocrystals covalently bound to metal surfaces with self-assembled monolayersV. L. Colvin, A. N. Goldstein, and A. P. AlivisatosCite this: J. Am. Chem. Soc. 1992, 114, 13, 5221–5230Publication Date (Print):June 1, 1992Publication History Published online1 May…
High-amplitude radial pulsations of a single gas bubble in several glycerine and water mixtures have been observed in an acoustic stationary wave system at acoustic pressure amplitudes on the order of 150 kPa (1.5 atm) at 21–25 kHz. Sonoluminescence (SL), a phenomenon generally attributed to the high temperatures gene…
Using both empirical potentials and first-principles total-energy methods, we have examined the energetics and elastic properties of all possible graphitic tubules with radii less than 9 \AA{}. We find that the strain energy per carbon atom relative to an unstrained graphite sheet varies as 1/${\mathit{R}}^{2}$ (where…
Abstract The National Institute of Standards and Technology (NIST) has made available the second version of the NIST X‐ray Photoelectron Spectroscopy Database. This paper reports on recent upgrades to the database to make the information more up‐to‐date and to make data searching and display more convenient and effici…