Acid-Functionalized Amphiphiles, Derived from Polystyrene-Poly(propylene imine) Dendrimers, with a pH-Dependent Aggregation
functionalized amphiphiles, derived from polystyrene-poly (propylene imine)
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Carbosilane-Based Dendritic Polyols
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbosilane-Based Dendritic PolyolsKlaus Lorenz, Rolf Muelhaupt, Holger Frey, Uwe Rapp, and Franz J. Mayer-PosnerCite this: Macromolecules 1995, 28, 19, 6657–6661Publication Date (Print):September 1, 1995Publication History Published online1 May 2002Published inissue 1 Septe…
Designed Assemblies in Open Framework Materials Synthesis: An Interrupted Sodalite and An Expanded Sodalite
Structure-directing hydrogen bonding, the molecular symmetry of the guest, and charge matching between host and guest are used to assemble four-ring units into sodalite-type cage assemblies with the imposition of the molecular symmetry of the template (guest) onto the final framework structure. Variable charge matchin…
Di-, Tri-, and Tetranucleating Pyridyl Ligands Which Facilitate Multicenter Magnetic Exchange between Paramagnetic Molybdenum Centers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDi-, Tri-, and Tetranucleating Pyridyl Ligands Which Facilitate Multicenter Magnetic Exchange between Paramagnetic Molybdenum CentersAngelo J. Amoroso, Alexander M. W. Cargill Thompson, John P. Maher, Jon A. McCleverty, and Michael D. WardCite this: Inorg. Chem. 1995, 34, 19…
Structures, Electronic Properties, and Oxidation-Reduction Reactivity of Halogenated Iron Porphyrins
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructures, Electronic Properties, and Oxidation-Reduction Reactivity of Halogenated Iron PorphyrinsMark W. Grinstaff, Michael G. Hill, Eva R. Birnbaum, William P. Schaefer, Jay A. Labinger, and Harry B. GrayCite this: Inorg. Chem. 1995, 34, 19, 4896–4902Publication Date (Pr…
Useful Designs in the Synthesis of Trans-Fused Polyether Toxins
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUseful Designs in the Synthesis of Trans-Fused Polyether ToxinsEleuterio Alvarez, Maria-Luz Candenas, Ricardo Perez, Jose Luis Ravelo, and Julio Delgado MartinCite this: Chem. Rev. 1995, 95, 6, 1953–1980Publication Date (Print):September 1, 1995Publication History Published…
Preparation of Ferroelectric Thin Films of Bismuth Layer Structured Compounds
Ferroelectric thin films of bismuth layer structured compounds, SrBi 2 Ta 2 O 9 , SrBi 2 Nb 2 O 9 , SrBi 4 Ti 4 O 15 and their solid solutions, were formed onto a sputtered platinum layer on a silicon substrate using spin-on technique and metal-organic decomposition (MOD) method. X-ray diffraction (XRD) analysis and s…
Single Crystal Study of ClOO. Matrix Effects in the ESR and IR Spectra of ClOO Trapped in KClO4
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle Crystal Study of ClOO. Matrix Effects in the ESR and IR Spectra of ClOO Trapped in KClO4J. R. BybergCite this: J. Phys. Chem. 1995, 99, 36, 13392–13396Publication Date (Print):September 1, 1995Publication History Published online1 May 2002Published inissue 1 September…
Ab initio MO study of the mechanism of oxidation of disulfides by hydrogen peroxide
A theoretical study of the mechanism of the first oxidation step of disulfides to thiosulfinates was performed on hydrogen disulfide and methyl disulfide with hydrogen peroxide. Ab initio molecular orbital calculations were carried out with the 6-31G** basis set. Key equilibrium geometries and transition states were o…
Grain Boundary Diffusion of Oxygen in Alumina Ceramics
The volume and grain boundary diffusion coefficients (D v and δD gb ) of oxygen at 1673 K in pure and Mg‐doped alumina were studied by using a resistive anode encoder of SIMS. The effect of Mg‐doping on D v , was observed clearly. The differences on δD gb in pure and Mg‐doped alumina were about 3 orders and 1 order of…
Defects and molecular alignment in monolayers of thermotropic liquid crystals on water
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDefects and molecular alignment in monolayers of thermotropic liquid crystals on waterMarc N. G. de Mul and J. Adin Mann Jr.Cite this: Langmuir 1995, 11, 9, 3292–3295Publication Date (Print):September 1, 1995Publication History Published online1 May 2002Published inissue 1 S…
RIGIDITY OF GRAPH SYMMETRIES IN THE 3-SPHERE
In this paper we show that, for any 3-connected graph G, if an automorphism of G is realizable by a homeomorphism of (S 3 , G) then there is an embedding of G such that that automorphism is induced by a finite order homeomorphism of (S 3 , G). We then use this result to characterize which automorphisms of an arbitrary…
Non-Fourier Heat Conduction in IC Chip
Instead of the classic Fourier equation based on diffusion, a hyperbolic equation based on a wave model has been used to predict the rapid transient heat conduction in IC chips. The peak temperature, spatial difference, and time variation of temperature, which are critical to thermal reliability of the chip, are given…
Analysis of morphology of crystals based on identification of interfacial structure
A new theoretical approach for the prediction of the growth habit of crystals is presented. This approach is based on a newly derived relation between the growth rate of crystal surfaces and habit-controlling factors, and includes a key step: a so-called interface structure (IS) analysis. This analysis is to formulate…
Dependence of the Intrinsic Conductivity Minimum of SrTiO 3 Ceramics on the Sintering Atmosphere
A shift of the intrinsic conductivity minimum of strontium titanate ceramics, which depends on the oxygen partial pressure of the sintering atmospheres, was observed. Different hydrogen partial pressures (at constant oxygen partial pressures) did not affect the minimum position. A comparison of the results with defect…
A shape model for the twisting power of chiral solutes in nematics
The twisting power of chiral probes in nematics is interpreted in terms of a shape model, in which the surface elements of the solute molecules tend to align with the local director. The theoretical treatment is based on a previous approach, suitable for relating order parameters in nematics to molecular shape, and le…
Reduction of Potassium Fixation by Two Humic Acid Fractions in Vermiculitic Soils
Abstract The capacity of soil organic matter (SOM) to reduce K fixation was investigated in calcareous vermiculitic soils. Humic acid fractions were extracted with the use of a modification of the standard NaOH extraction procedure. The mobile humic acid pool (MHA) was extracted without initial decalcification. Additi…
The dissolution/reprecipitation technique applied on high‐density polyethylene: I. Model recycling experiments
Abstract A model dissolution/reprecipitation process is studied for the recycling of high‐density polyethylene (HDPE). The process proposed basically comprises dissolution of the plastic in an appropriate solvent, reprecipitation by using a nonsolvent, thorough washing of the material obtained, and drying. The solvent…
Initial Growth of Heteroepitaxial Diamond on Si(001) Substrates via β-SiC Buffer Layer
Negative substrate-bias effects on diamond heteroepitaxial nucleation have been investigated using microwave plasma-assisted chemical vapor deposition. The density and the percentage of azimuthally ordered particles grown on carburized Si(001) or on high-quality β-SiC(001) have been estimated by varying the bias-treat…
Ultra High Strength, High Modulus Polyethylene Spectra Fibers and Composites
SPECTRA® polyethylene fibers are rapidly gaining acceptance in many applications in which high strength and modulus are required. They also represent a breakthrough in fiber technology because they represent the first case of a successful conversion of a flexible polymer into an ultra-strong fiber. Until the work of P…