Research and development in textiles have gone beyond the conventional applications as clothing and furnishing materials;for example, the convergence of textiles, nanotechnologies, and energy science opens up the oppo...
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Research and development in textiles have gone beyond the conventional applications as clothing and furnishing materials;for example, the convergence of textiles, nanotechnologies, and energy science opens up the opportunity to take on one of the major challenges in the 21st century-energy. This presentation addresses the development of high-energy lithium-ion batteries using electrospun nanofibers.
Complex phase transformation between the hexagonal cylinder (Hex) and double gyroid (G) phases in a polystyrene-block-poly(ethylene oxide) (PS-b-PEO) diblock copolymer was investigated using two-dimensional (2D) synch...
Complex phase transformation between the hexagonal cylinder (Hex) and double gyroid (G) phases in a polystyrene-block-poly(ethylene oxide) (PS-b-PEO) diblock copolymer was investigated using two-dimensional (2D) synchrotron small-angle X-ray scattering (SAXS), and transmission electron microscope (TEM). The PS-b-PEO sample contained a small population of another bicontinuous cubic phase having an Im3m symmetry. These two bicontinuous cubic phases (G and Im3m) had the same unit cell dimensions. Under a large-amplitude reciprocating shear, the bicontinuous cubic phases transformed into a “single-crystal”-like Hex phase. When annealed at 150 °C for 40 min, the Hex phase partially transformed into well-oriented twinned structures of the G and Im3m phases without significant loss of orientation in 2D SAXS measurements. Epitaxial phase transformation relationships between the Hex/G and Hex/ Im3m phases were identified. The mechanism of the Hex → G transformation was examined by TEM.
New polyfluorene copolymers containing phenothiazine derivatives have been designed, synthesized, and characterized. Synthesized copolymers, PFPCVBs and PFPTRs, are shown that their CIE coordinate values are very clos...
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The thermal conductivity of wurtzite and zinc blende indium arsenide nanowires was measured using a microfabricated device, with the crystal structure of each sample controlled during growth and determined by transmis...
The thermal conductivity of wurtzite and zinc blende indium arsenide nanowires was measured using a microfabricated device, with the crystal structure of each sample controlled during growth and determined by transmission electron microscopy. Nanowires of both phases showed a reduction of the thermal conductivity by a factor of 2 or more compared to values reported for zinc blende indium arsenide bulk crystals within the measured temperature range. Theoretical models were developed to analyze the measurement results and determine the effect of phase on phonon transport. Branch-specific phonon dispersion data within the discretized first Brillouin zone were calculated from first principles and used in numerical models of volumetric heat capacity and thermal conductivity. The combined results of the experimental and theoretical studies suggest that wurtzite indium arsenide possesses similar volumetric heat capacity, weighted average group velocity, weighted average phonon-phonon scattering mean free path, and anharmonic scattering-limited thermal conductivity as the zinc blende phase. Hence, we attribute the differing thermal conductivity values observed in the indium arsenide nanowires of different phases to differences in the surface scattering mean free paths between the nanowire samples.
Corrosion inhibition effect of cationic surfactants, DTAB (Dodecyl Three methyl Ammonium Bromide) and TTAB (Tetradecyl Three methyl Ammonium Bromide) on low carbon steel was studied using weight loss, Open circuit pot...
Corrosion inhibition effect of cationic surfactants, DTAB (Dodecyl Three methyl Ammonium Bromide) and TTAB (Tetradecyl Three methyl Ammonium Bromide) on low carbon steel was studied using weight loss, Open circuit potentional (OCP) and Electrochemical Impedance Spectroscopy (EIS) measurements. The effect of chain length compatibility on corrosion inhabitancy of surfactant and co-surfactant was investigated by C7OH (1-heptanol), C12OH (1-dodecanol) and C15OH (1-pentadecanol) as nonionic co-surfactants in acidic media at different concentrations of DTAB and TTAB. Data represented that the corrosion rate decreased by increasing concentration of DTAB and TTAB, independently. The effect of chain length compatibility on surfactant behavior was discussed. Decreasing of corrosion rate for DTAB+C12OH was more pronounced than other mixtures.
Corrosion inhibition efficiency of Gemini surfactant 1,4-butan-bis-dimethyl dodecyl ammonium bromide (designed as 12-4-12), 1,4-butan-bis-dimethyl tetradecyl ammonium bromide (designed as 14-4-14), conventional surfac...
Corrosion inhibition efficiency of Gemini surfactant 1,4-butan-bis-dimethyl dodecyl ammonium bromide (designed as 12-4-12), 1,4-butan-bis-dimethyl tetradecyl ammonium bromide (designed as 14-4-14), conventional surfactants dodecyl thrimethyl ammonium bromide (DTAB) and tetradecyl thrimethyl ammonium bromide (TTAB) on low carbon steel is investigated using three common methods namely, weight loss, open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS). The influence of chain length and temperature of the media is verified. Data indicate that, the corrosion inhibition efficiency is improved by increasing the concentration and chain length of the surfactants. Corrosion rate of steel increases by increasing the temperature of the medium containing surfactant. Adsorption isotherm of used surfactants and kinetic parameters are studied.
Corrosion inhibitors are widely used in acid solutions during pickling and descaling. In this study, the inhibition performance of different alkaline metal salts in the concentration range 0-0.1 M has been found out. ...
Corrosion inhibitors are widely used in acid solutions during pickling and descaling. In this study, the inhibition performance of different alkaline metal salts in the concentration range 0-0.1 M has been found out. The corrosion behavior of low carbon steel in 1 M HCl in the presence of different metal cations and different anions is studied using weight loss and OCP (Open Circuit Potential) methods at 20 åC. It is found that the addition of these salts inhibits the corrosion markedly. The inhibition effect is in the following order Na2SO4 >NaI > LiCl > NaCl > KCl > NaNO3 > NaBr.
Although a high electric energy density was recently reported for defect-modified poly(vinylidene fluoride) (PVDF) copolymers at millisecond discharge, they usually deliver less energy at a high pulse rate. In this wo...
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