We investigate the optical Kerr effect of SrTiO3 (STO) crystal, of which the nonlinear response time was measured to be less than 200 fs, while the nonlinear refractive index is estimated to be 2.16 × 10 −15 cm 2 /W. Using the optical Kerr gate (OKG) technique with an STO crystal as the Kerr medium, we obtain narrow-bandwidth and symmetric gated spectra from a supercontinuum generated in distilled water by a femtosecond laser. The experimental results show superiority compared with the gated spectra obtained using OKG with CS2 as the Kerr medium, demonstrating that STO crystal is a promising OKG medium.
A method of fine and equiaxed microstructure production through Sandglass Extrusion (SE) has been investigated in this paper. In the experiment, a special severe plastic deformation process was conducted in a sandglass die, which is different from Equal-Channel-Angular-Extrusion and looks like cyclic and reciprocating extrusion and compression. A cast Zn-5%Al eutectic alloy with initial grain size about 200*m and another extruded LY 12 Al-alloy with initial strong texture have been used as the test materials.The Sandglass Extrusion Processing (SEP) has been described in details. The microstructures after different SEP were observed. The influences of SEP, SE passes and extrusion ratios on the microstructures have been analyzed and discussed. The experimental results showed that the streamlines in test material could be destroyed and uniform equiaxed microstructures with phase particle size of about 1*m could be achieved in Zn-5%Al by SEP at 553K, the m value in superplastic compression test after SEP reached 0.49 under 573K at strain rate of 4.7 10 -2 s -1 . The initial crystal preferential orientation in extruded LY 12 alloy was weakened greatly by means of SEP and strong oriented textures disappeared almost.
poly[(2-methoxy,5-octoxy)1,4- phenylenevinylene-carbon nanotube composites (MOPPV-CNTs) were synthetized by In-situ polymerization in the paper. The molecular structure and surface morphology of the nanocomposites were characterized by the TEM. The TEM results showed that the MOPPV coated on the CNTs forming Core-shell nanowires structure composite. The wavelength of UV-absorption spectra of the composites exhibited a blue shift caused by the functionalized MWCNTs. the energy gap of the composites were increased. The band structures of the composite were determined by using cyclic voltammetry, the result shown that the HOMO energy and the LUMO energy increased with the concentration of CNTS. The increase of LUMO energy would benefit for balance of the carries injection when the composites used in the optoelectronic devices.
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