Materials Literature
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The electrosynthesis of poly(p-xylylenes) (PPXs) and poly(p-phenylenevinylenes) (PPVs) by the direct and mediated cathodic reduction of (halomethyl)arenes is reviewed and, where appropriate, comparisons made with more conventional chemical routes. Attention is drawn to the advantages of mild (non-thermal) conditions a…
Pyrolysis of six nonconventional fuels has been studied by means of nonisothermal thermogravimetric analysis from low (5 °C/min) to high heating rates (as large as 900 °C/min). The fuels tested included plastics, rubbers, and ligno-cellulosic materials, namely, polyethylene, poly(ethylene terephthalate), scrap tires,…
We have studied the optical conductivity of several intermetallic compounds of the Al-Cr-Fe system in a broad range of frequencies. Depending on composition, the crystallographic structure of these compounds evolves from that of a close approximant of the decagonal phase to a \ensuremath{\gamma}-brass structure, a sup…
We introduce a new combination of diene/diene microstructures to form microphase-separated ABC terpolymers. The synthesis and morphology of two triblock terpolymers of the poly(butadiene - b -styrene - b -isoprene) (BSI) type and one poly(styrene - b -butadiene - b -isoprene) (SBI) type are reported. The microstructur…
A highly lipophilic polyion complex [Pt(en)(2)][PtCl(2)(en)(2)](1)(4) (en, 1,2-diaminoethane) is prepared from one-dimensional mixed valence Pt(II)/Pt(IV) complex and newly designed chiral amphiphile 1. The powdery sample showed purple color, which is a result of the mixed valence absorption of the linear chlorobridge…
We have deposited continuous Au films on the Cu 2 S nanowire surfaces using a simple redox reaction, forming a novel type of Cu 2 S/Au core/sheath nanowires. The core/sheath nanostructures were characterized by various spectroscopic and microscopic techniques. The Cu 2 S core that was used as the template was typicall…
The complex dielectric permittivity $(\ensuremath{\varepsilon}={\ensuremath{\varepsilon}}^{\ensuremath{'}}\ensuremath{-}i{\ensuremath{\varepsilon}}^{\ensuremath{''}})$ of relaxor ferroelectric $0.75\mathrm{Pb}({\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}){\mathrm{O}}_{3}\ensuremath{-}0.25{\mathrm{PbTiO}}_{3}$ ceramics with…
Attachment of Fréchet-type poly(benzyl ether) dendrons [G-n] to carbonylruthenium(II) meso-tetraphenylporphyrin (5) using covalent etheric bonds forms a series of dendritic ruthenium(II) porphyrins 5-[G-n](m) (m=4, n=1, 2; m=8, n=0-2). The attachment was realized by treating the carbonylruthenium(II) complex of 5,10,1…
The syntheses, structures, and characterization of three new mixed metal selenites, Al 2 (Se 2 O 5 ) 3, Ga 2 (Se 2 O 5 ) 3, and In 2 (Se 2 O 5 ) 3 are reported. Al 2 (Se 2 O 5 ) 3 and Ga 2 (Se 2 O 5 ) 3 are isostructural to Cr 2 (Se 2 O 5 ) 3 and crystallize in the monoclinic space group P 2 1 / n (No. 14) with a = 10…
We show that the morphology of polyethylene oxide crystallization in thin films can be tuned to obtain circular spherulites, seaweed and symmetric dendrites, and fractal aggregation forms through the addition of clay particles and the amorphous polymer, polymethyl methacrylate. The thin-film polymer crystallization pa…
Nanosheet sols of exfoliated layered niobate K4Nb6O17 exhibited a drastic increase in viscosity upon acidification to form unusual pseudoplastic gels, which may be applicable as future soft nanomaterials.
A general synthetic approach to variously polarised merocyanines and a cyanine with enhanced thermal and (photo)chemical stability by a locked all-trans conformation (derived from a rigidified hexatriene unit and a variety of common donor and acceptor groups) is presented as well as a systematic study of their (non)li…
Globally conserved phase ordering dynamics is investigated in systems with short range correlations at t=0. A Ginzburg-Landau equation with a global conservation law is employed as the phase field model. The conditions are found under which the sharp-interface limit of this equation is reducible to the area-preserving…
Polyaniline (PANI)-intercalated graphite oxides (GOs) or FeOCl were synthesized via exchange reaction of n-hexadecylamine-intercalated graphite oxides or FeOCl by PANI in an organic solvent. PANI-intercalated GOs with interlayer spacings (Ic values) of 1.14–1.68 nm and compositions of (PANI)1.1–5.0GO were obtained, de…
Immobilized gold nanoparticles on a three-dimensionally ordered macroporous (3DOM) film were prepared by a dipping method. The localized surface plasmon resonance of the nanoparticles and the stop-band of the 3DOM film, both still evident after immobilization, are both dependent on the refractive index of the surround…
Intramolecular energy transfer from a non-protonated phenanthridine chromophore to ytterbium occurs rapidly despite negligible overlap of the triplet state of phenanthridine with the absorption band of the metal centre. This can be explained by a sequential electron transfer and back electron transfer, or redox, mecha…
Unknown in bulk BaI2: Ba coordination numbers of 5 and 6 are present in the one-dimensional (1D) crystal chains formed by BaI2 within single-walled carbon nanotubes (SWNTs). This is revealed by high-resolution transmission electron microscopy images (I). The derived structure model II shows the bond angles measured fo…
Immobilisation of Co-salen and Co-fluomine onto ordered mesoporous silica has been achieved through coordination of the cobalt to pyridine or imidazole groups covalently attached to the silica matrix. Two routes have been investigated to obtain mesoporous hybrid materials containing coordinating ligands: post synthesi…
The structures of the liquid crystalline chiral subphases exhibited by several materials containing either a selenium or sulphur atom have been investigated using a resonant x-ray scattering technique. This technique provides a unique structural probe for the ferroelectric, ferrielectric, antiferroelectric, and SmC(*)…
Alternating naphthyridine–pyrimidine strands self-organize into a helical conformation containing a strongly polar cavity. The binding of metal and ammonium cations promotes supramolecular self-assembly in a sort of effector-induced growth process to form polymolecular stacks (see schematic representation) and fibers…