Materials Literature
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Two one-dimensional gallium fluorodiphosphates Ga(P 2 O 7 )F·H 3 N(CH 2 ) 3 NH 3 ·3H 2 O, 1, and Ga(P 2 O 7 )F·H 3 N(CH 2 ) 3 NH 3 ·H 2 O, 2, have been synthesized under mild conditions (<100 °C) from aqueous mixtures of Ga(NO 3 ) 3 ·6H 2 O, P 2 O 5, 1,3-diaminopropane, and HF. Their structures consist of anionic chai…
The photophysical and photochromic properties of 2,2-diphenyl-2H-naphtho[1,2-b]pyran and substituted derivatives were investigated by steady state and time-resolved optical absorption and emission spectroscopy in solution at room temperature and in a frozen matrix at 77 K. Fluorescence quantum yields, fluorescence lif…
Simple methods for preparing boron carbide nanowires have been investigated. The methods involve thermal evaporation of C/B/B 2 O 3 powder precursors in an argon atmosphere with or without metal catalysts. High-purity nanowires (50−200 nm) were obtained by employing a precursor that has C:B:B 2 O 3 molar ratios of 1:2…
Palladium-catalyzed polymerization of pseudo- p -divinyl[2.2]paracyclophane ( 2 ) and 2,5-dialkoxy-1,4-diiodobenzenes ( 3a and 3b ) was carried out to give the corresponding polymers ( 4a and 4b ) having [2.2]paracyclophane as a repeating unit. The structures of the polymers were supported by 1 H and 13 C NMR spectra.…
We successfully formed an inclusion complex between nylon-6 and α-cyclodextrin and attempted to use the formation and subsequent disassociation of the nylon-6/α-cyclodextrin inclusion complex to manipulate the polymorphic crystal structures, crystallinity, and orientation of nylon-6. Formation of the inclusion complex…
Two families of narrow polydispersity poly(styrene)-based block copolymers bearing side groups containing both a phenyl ring and a para -linked semifluorinated side group were designed to produce stable low energy surfaces. The effects of the phenyl ring on the surface and bulk structure of the materials were investig…
Magnetic properties of the Co valence tautomers are considered in wide range of magnetic field and temperature. Particularly, a model of the first order structural phase transition accompanied by a magnetic moment jump is proposed. The phase diagrams of the phase transition on a B-T plane (B is magnetic field and T is…
A transition for a random coil to an extended chain conformation in dilute polyaniline solutions has been shown to induce delocalization of polarons and to increase the conductivity in the solid state by MacDiarmid et al. We have investigated a similar chain extension during a transition from isotropic to a liquid cry…
Polymeric light-emitting diodes with sufficient brightnesses, sufficient efficiencies, sufficiently low driving voltages, and various interesting features have been reported. The relatively short device lifetime, however, still remains as a major problem to be solved before any commercial applications can be realized.…
Thin films were made by spinning a dispersion of tin-doped indium oxide particles, having an average diameter of 14 nm, onto glass substrates. As-deposited thin films displayed a resistivity ρ of 0.3 Ω m and some optical absorption. Annealing in vacuum at 200–400 o C for 2 h, and subsequently in air at 500 o C for 2 h…
Fucans are sulphated polysaccharides extracted from brown seaweed, which display a wide scale of activities including inhibition of tumour cell invasion. Like several sulphated polysaccharides, they have been shown to be potent inhibitors of experimental metastasis. However, their mechanism of action is not fully unde…
A liquid−gel transition measured for a polymerically stabilized dispersion as a function of solvent quality and particle volume fraction is compared with theoretical predictions of phase behavior. The experimental liquid−gel transition is interpreted from rheological measurements of 360 nm polystyrene (PS) particles w…
For many applications, it is essential to be able to control the interface between devices and the biological environment by nanoscale control of the composition of the surface chemistry and the surface topography. Application of molecular thickness coatings of biologically active macromolecules provides predictable i…
Carbon nanotubes have fascinating physical properties. In order to use these novel one-dimensional structures for applications (such as in electronic devices, mechanical reinforcements and nano-electromechanical systems) the structure of nanotubes needs to be tailored and various architectures have to be configured us…
New [M(R(2)pipdt)(2)](BF(4))(2) salts [R(2)pipdt = N,N'-dialkyl-piperazine-2,3-dithione; M = Pd(II), R = Me and M = Pt(II), R = Me, Et, Pr(i)] bearing redox-active cationic dithiolene complexes have been prepared and characterized. These cations react with the redox-active [M(mnt)(2)](2-) [M = Pd(II), Pt(II); mnt = ma…
Isothermal miscibility maps for blends of styrene−acrylonitrile (SAN) copolymers with methyl methacrylate (MMA) copolymers containing n -alkyl acrylates (xA) have been determined at 120 °C. The miscibility region increases and then decreases as the size of the n -alkyl pendant group increases. Binary interaction energ…
Thin films consisting of polyelectrolytes and positively charged TiO 2 nanoparticles were fabricated by the dip and the spin self-assembly (SA) methods. Employing the same deposition sequence in both methods, both SA films showed a similar thickness. We observed a comparatively layered structure in the spin SA film an…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTRadial Size of a Starburst Dendrimer in Solvents of Varying QualityYu-Jane Sheng, Shaoyi Jiang, and Heng-Kwong TsaoView Author Information Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan 106, Republic…
Changes of higher-order structure of poly(ethylene glycol)−poly(butadiene) (PEG−PBd) di- and triblock copolymers in isothermal crystallization from microphase-separated melts were studied using time-resolved synchrotron small-angle X-ray scattering (SR−SAXS) techniques. Lamellar microphase structure of PEG−PBd with we…
Free-standing sterilized edible films based on milk proteins, namely calcium caseinate and whey protein isolate, and polysaccharides, namely pectin and agar, were developed. Cross-linking of the proteins was achieved by the combination of thermal and radiative treatments. Autoclaving pectin and agar prior to their add…