Materials Literature
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A concept is demonstrated for comb-shaped supramolecules based on dodecylbenzenesulfonic acid-doped polyaniline, i.e., PANI(DBSA) 0.5, by complexation with zinc dodecylbenzenesulfonate, Zn(DBS) 2 . Model studies using related protonated single crystalline bipyridine oligomers suggest that Zn(DBS) 2 molecules are bonde…
We report on the electrical and defect characterization of Au Schottky diodes formed on single-crystal ZnO, before and after irradiating with high-energy (1.8 MeV) protons. Prior to bombardment we observed that several electron traps (E1-E4), with energies between 0.10 and 0.57 eV below the conduction band, are presen…
Combined high-resolution transmission electron microscopy, selected area electron diffraction and parallel electron energy loss spectroscopy are used to characterise carbon nano-phases found embedded in fused quartz. These appear after implantation of 1 MeV carbon ions, followed by annealing in argon, oxygen and formi…
Abstract The anisotropic structures found in drawn poly(lactic acid) films are strongly correlated to their overall dimensional stability. Several aspects of this relationship can be efficiently characterized by Raman spectroscopy. We determined the degree of orientation in these drawn films by measuring the relative…
Abstract This article demonstrated the possibility of recycling PVC pipes by investigating the effect of adding PVC pipes (varying from 0 to 80 % wt) into two commercial PVC virgin grades on the rheological, morphological, mechanical, and thermal properties of the PVC blends. The results obtained showed an increase in…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTToward the Biaxial Nematic Phase of Low Molar Mass Thermotropic Mesogens: Substantial Molecular Biaxiality in Covalently Linked Rod−Disk DimersJonathan J. Hunt, Richard W. Date, Bakir A. Timimi, Geoffrey R. Luckhurst, and Duncan W. BruceView Author Information School o…
A finite-depth square-well model is used to show that the band gap of a nanoparticle for a given size can be tuned by embedding the nanoparticle in different matrices. This may find a technological importance in different branches of physics. The band gaps calculated using this model are found to be consistent with re…
A facile, single-step transesterification approach to poly(lactides) with controlled molecular weights and end-group functionality, as well as block and star-shaped architectures is described using nucleophilic amine catalysts.
Modification of polypropylene by hyperbranched grafting with a poly(acrylic acid) graft was carried out using techniques previously used with gold, aluminum, silicon, and polyethylene surfaces. An initial etching oxidation produced a modified polypropylene that was presumed to contain carboxylic acid functional groups…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTA New C−F Bond-Cleavage Route for the Synthesis of Octafluoro[2.2]paracyclophaneHideki Amii, Yasushi Hatamoto, Motoharu Seo, and Kenji UneyamaView Author Information Department of Applied Chemistry, Faculty of Engineering, Okayama University 3-1-1 Tsushimanaka, Okayama 700-8530…
The syntheses of trans -[Ru(C CHR)Cl(pp) 2 ]PF 6 (pp = dppm, R = 4-C 6 H 4 C⋮CPh, 4-C 6 H 4 CHO, 4,4‘-C 6 H 4 C⋮CC 6 H 4 NO 2, ( E )-4,4‘-C 6 H 4 CH CHC 6 H 4 NO 2, 4,4‘,4‘ ‘-C⋮CC 6 H 4 C⋮CC 6 H 4 C⋮CC 6 H 4 NO 2; pp = dppe, R = 4-C 6 H 4 CHO, ( E )-4,4‘-C 6 H 4 CH CHC 6 H 4 NO 2 ) and trans -[Ru(C⋮CR)Cl(pp) 2 ] (pp =…
We report viscosity and compressibility measurements of trehalose, maltose, and sucrose aqueous solutions at different concentration and temperature values. What emerges from the concentration dependence of viscosity and compressibility is that trehalose, in comparison to maltose and sucrose, shows a higher interactio…
Influence of disorder on the ferromagnetic phase transition in diluted (III,Mn)V semiconductors is investigated analytically. The regime of small disorder is addressed, and the enhancement of the critical temperature by disorder is found both in the mean field approximation and from the analysis of the zero temperatur…
Many glass-forming substances display heat capacities for their supercooled liquids that substantially exceed those of the corresponding crystals. Reasonable extrapolation below the kinetic glass transition temperature indicates that the molar entropies of the supercooled liquid and crystal phases would become equal a…
The ligand 2-mercapto-3,5-di-tert-butylaniline, H[L(AP)], an o-aminothiophenol, reacts with metal(II) salts of Ni and Pd in CH3CN or C2H5OH in the presence of NEt3 under strictly anaerobic conditions with formation of beige to yellow cis-[M(II)(L(AP))2] (M = Ni (1), Pd (2)) where (L(AP))1- represents the o-aminothioph…
The Nobel Prize in Chemistry 2000 was awarded for our discovery and development of conducting polymers, but that discovery only happened after much work on polyacetylene. In this lecture, I would like to talk about the early investigations that preceded and eventually led to the discovery of chemical doping. I do hope…
We study the effect of fluid flow on three-dimensional (3D) dendrite growth using a phase-field model on an adaptive finite-element grid. In order to simulate 3D fluid flow, we use an averaging method for the flow problem coupled to the phase-field method and the semi-implicit approximated projection method (SIAPM). W…
The present paper describes the synthesis and characterization of nanocomposite materials built from the assembly of organic polymers and two-dimensional host materials, particularly reviewing those composed of layered double hydroxide (LDH) inorganic frameworks. When the meaning commonly adopted for nanocomposites is…
together with a talented group of graduate students and postdoctoral researchers, discovered conducting polymers and the ability to dope these polymers over the full
Abstract In addition to round nanofibers, electrospinning a polymer solution can produce thin fibers with a variety of cross‐sectional shapes. Branched fibers, flat ribbons, ribbons with other shapes, and fibers that were split longitudinally from larger fibers were observed. The transverse dimensions of these asymmet…