New Charge Transfer Luminescent Polymetallic Complexes of Rhodium(III), Iridium(III), and Ruthenium(II) with the Bridging Ligand 1,4,5,8,9,12-Hexaazatriphenylene
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Role of Defects in the Ferroelectric Relaxor Lead Scandium Tantalate
Unlike Pb(Mg 1/3 Nb 2/3 )O 3 and similar ferroelectric relaxors which never truly become ferroelectric at zero‐field, disordered Pb(Sc 1/2 Ta 1/2 )O 3 (PST) is a relaxor that spontaneously transforms into a ferroelectric phase. The control of the degree of order of the B‐site cations in PST by appropriate heat treatme…
Director deformation of a twisted chiral nematic liquid crystal cell with weak anchoring boundaries
On the basis of a generalization of the Rapini-Papoular expression [J. Phys. (Paris) Colloq. 30, C4-54 (1969)] for the anchoring energy, the rigorous expressions for the threshold and saturation fields are derived analytically, in detail, for a field-controlled twisted chiral nematic slab with weak boundary coupling.…
Ultrafast Photoinduced Electron Transfer in Rigid Porphyrin-Quinone Dyads
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUltrafast Photoinduced Electron Transfer in Rigid Porphyrin-Quinone DyadsAlisdair N. Macpherson, Paul A. Liddell, Su Lin, Lori Noss, Gilbert R. Seely, Janice M. DeGraziano, Ana L. Moore, Thomas A. Moore, and Devens GustCite this: J. Am. Chem. Soc. 1995, 117, 27, 7202–7212Pub…
Multiple-cascade model for the filling of hollow Ne atoms moving below an Al surface
Analytic expressions for a multiple-cascade model were derived to study the filling of L and K vacancies of hollow Ne atoms moving in shallow layers of an Al surface. The model requires cross sections for charge transfer into the L shell of the projectile that were determined from molecular-orbital calculations includ…
Self‐assembled nanoscale tubular ensembles
Nanoscale tubular biomaterials (e.g. see Fig.) produced by the self‐assembly of peptide nanotube structures have a potentially wide range of applications in chemistry, biology, and materials science. The methods of producing such structures are reviewed and a number of potential applications discussed magnified image .
Electronics of Colloidal Nanometer Particles
Abstract Small colloidal particles *) and clusters *) of semiconductors and metals exhibit unusual properties and may be considered as a new physico‐chemical dimension between the molecules and the bulk materials. The surface to volume ratio is extremely large; small‐particle research therefore constitutes a combinati…
Scattering from polymer films and its application to optical properties of blends and display devices
Abstract The application of the technique of observing the light scattering from solid polymers for the study of amorphous phase separation, spherulitic crystallization, phase separation in crystalline polymers, and coarsening of liquid crystal polymers is reviewed. The effect of shear and electrical and magnetic fiel…
Superplastic Forming and Diffusion Bonding of Aircraft Structures
The diffusion bonding (DB)/superplastic forming (SPF) manufacturing process, for titanium 6A1/4V material, has been developed within British Aerospace for the manufacture of military aircraft components. Diffusion bonding of titanium alloys offers the potential for parent metal joint strengths, and when combined with…
Synthesis and Characterization of Graft Copolymers with Molecularly Uniform Urethane-Based Side Chains with Special Structural Elements
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Characterization of Graft Copolymers with Molecularly Uniform Urethane-Based Side Chains with Special Structural ElementsClaus D. Eisenbach and T. HeinemannCite this: Macromolecules 1995, 28, 14, 4815–4821Publication Date (Print):July 1, 1995Publication History…
Effective Thermal Conductivity of Monolithic and Porous Catalyst Supports by the Moment Technique
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffective Thermal Conductivity of Monolithic and Porous Catalyst Supports by the Moment TechniqueKirali Murtezaoglu, Esra Oray, Timur Dogu, Gulsen Dogu, Nurdan Saracoglu, and Canan CabbarCite this: J. Chem. Eng. Data 1995, 40, 4, 720–725Publication Date (Print):July 1, 1995P…
Self‐assembly via a complex phase transition in mixtures of polystyrene‐block ‐polybutadiene block copolymer and poly(methyl vinyl ether)
Abstract The self‐assembly of a binary mixture of polystyreneblock‐polybutadiene (SB) and poly(methyl vinyl ether) (PVME) was studied by transmission electron microscopy and time‐resolved light scattering. The self‐assembly studied involved first microphase separation, in which a microdomain structure composed of poly…
Composition‐dependent Flory‐Huggins parameters: molecular weight influences at high concentrations
Abstract Flory‐Huggins interaction parameters χ were determined by means of equilibrium vapor pressures (measured via a combination of a head‐space sampler with a gas chromatograph) and light scattering as a function of composition and temperature for the systems cyclohexanone/polystyrene [CHO/PS] and cyclohexanone/po…
High magnetic field investigations of the magnetoelectric effect in magnetic ferroelectrics (RBi)FeO3
The field induced transition from the space modulated spin structures to the homogeneous antiferro-magnetic state in magnetic ferroelectrics R x Bi1–x FeO3 (R = La3+, Nd3+, Dy3+) was investigated. It has been established that space modulated spin structures (SMSS) exists in compounds: with La up to concentration x = 0…
In situ, quantitative characterization of gelation and fusion mechanism in poly(vinyl chloride) plastisols by small angle light scattering (SALS)
Abstract The present paper explores an effective means of characterizing structural changes of poly(vinyl chloride) (PVC) particles during gelation and fusion of PVC plastisols with small angle light scattering (SALS). The SALS method was shown to provide an in situ observation of swelling of PVC particles as well as…
Charge Separation in Zinc Diporphyrin-Zinc Porphyrin-Pyromellitimide-Quinone Tetrads
Abstract Tetrads 3 and 5 consisting of 1,2-phenylene-bridged zinc diporphyrin (D), zinc porphyrin (M), pyromellitimide (I), and quinone (Q) were synthesized. Upon photoexcitation, these tetrads provide fully charge separated ion pair states (D)+—M—I—(Q)−, whose lifetimes are longer than those of corresponding Q-free t…
Helium reemission, desorption and microstructure evolution of graphites under helium ion implantation
Helium reemission, trapping, and thermal desorption from highly ordered pyrolytic graphite (HOPG and HPG) of different orientation, polycrystalline graphite (EK98), and titanium doped graphite (RG-Ti-91) have been measured at irradiation temperatures of 300 K and 800 K. The implantation was performed with a 40 keV 4He…
Smoke/Char Relationships in PVC Formulations
Two blends of acrylonitrile-butadiene-styrene with unplasticised poly (vinyl chloride) and a tertiary blend of acrylonitrile-butadiene-styrene, unplasticised poly (vinyl chloride) and poly (propylene) containing a smoke sup pressing iron compound gives good reductions in smoke and high yields of car bonaceous char whe…
Complete Density Functional Normal Coordinate Analysis of Dichlorosilicon Porphyrazine
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplete Density Functional Normal Coordinate Analysis of Dichlorosilicon PorphyrazineDieter Braun and Arnout CeulemansCite this: J. Phys. Chem. 1995, 99, 28, 11101–11114Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 Ju…
Secondary doping: A new concept in conducting polymers
Abstract Phenomenologically, a primary dopant for a conducting polymer is a substance which drastically changes the electronic, optical, magnetic, and/or structural properties of the polymer and is accompanied by a large increase in conductivity. Phenomenologically, a secondary dopant is an apparently “inert” substanc…