Advanced Materials Research Vols. 306-307

Abstract: Toughening of poly(lactic acid) (PLA) biopolymer by particles of acrylic based core-shell rubber (CSR) was conducted to observe the influences of the rubber contents on the properties of the modified PLA. A series of PLA specimens modified with the CSR by 0.1-10 wt% was prepared by twin screw extrusion and injection. Diminishing brittleness was reflected in the dramatic increment of both the impact strength by threefolds and the elongation at break by fifteenfolds when CSR was employed by 10 wt%. The toughening was also accompanied with a decrease in the tensile modulus and strength. At low loading, the added CSR by 0.5wt% also assisted crystallization of the PLA by slightly lowering the crystallization temperature, allowing decreased processing time and improving the degree of crystallinity of the generally difficult to crystallize PLA.

Abstract: TiO_2-xN_x film was prepared by the combination of sol-gel and spin-coating method on indium-tin oxide (ITO) conducting glass substrate. Then an ITO/TiO_2-xN_x/NiO composite electrode was obtained by chemical bath deposition (CBD). The morphology, crystal structure and composition of the ITO/TiO_2-xN_x film were characterized by SEM, XRD, and XPS. The photoelectrochemical properties of the ITO/TiO_2-xN_x/NiO electrode were evaluated by photocurrent transient measurements and UV-visible transmittance spectra. The results showed that the ITO/TiO_2-xN_x/NiO electrode was sensitive to light and exhibited a noticeable photoelectrochromism.

Abstract: Hyperbranched poly(amido amine) (PAMAM) was prepared by Michael addition reaction of methyl acrylate (MA) and ethidenediamine (EDA). The result showed that fluorescence intensities increased with increasing the molecular weight. Importantly, the present work showed a new kind of fluorescence-emitting moieties in the fluorescence spectra, which different from the results as reported in PAMAM dendrimers.

Abstract: Cubic KTa_1-xNb_xO₃ single crystals with difference compositions have been grown by Czochralski technique in KTaO₃- KNbO₃ solid solution system. Growth habit, morphological feature, and other properties of two different composition KTN crystals, KTa_0.65Nb_0.35O₃, and KTa_0.63Nb_0.37O₃ are investigated in this work. The X-ray diffraction (XRD) experimental results show that all crystals belong to cubic phase at room temperature, lattice parameter a is 3.993 and 3.994Å corresponded to the composition of x (Nb) =0.35, 0.37, respectively. HXRD and AFM measurement results show all KTN crystals are in high integrity and good quality. The transmittance spectra of KTN crystals show that the cut off wavelength of KTN crystals decreased with the Nb increasing in the crystal. The dielectric-temperature measurement results shows KTN crystal have optimal performance on Kerr effect at the Currie temperature of the crystal. All the results show that the KTN crystals we grown are in good quality and have a broad application prospects

Abstract: We report the synthesis, photophysical investigation, computational studies and electroluminescent(EL) properties of an organic electroluminescent material-Bis(8-hydroxyQuino line) acetylacetone aluminum (Alq₂A). It is characterized by ¹H NMR, IR and elemental analysis techniques. The absorption and fluorescence spectra of various Alq₂A systems including solution in ethanol, powder and thin film on quartz (thickness of 50nm) have also been systematically evaluated. Analysis of the electronic structure of Alq₂A calculated by quantum chemical calculations reveals a localization of orbital and the distribution of orbital energy. The results from EL experiments indicate that Alq₂A has good electron transport properties as compared with tris(8-hydroxyquinolinato) aluminum (Alq₃). Thus, Alq₂A is considered to be a superior emitter and electron transporting material for display application compared with Alq₃.

Abstract: The high quality ZAO thin films were successfully produced by DC reaction magnetron sputtering technology. The XRD，electrical and optical properties of films are particular investigated. The results show that ZAO films are polycrystalline hexagonal wurtzite structure，and Al2O3 crystal phase are not found. At the same time，the high quality ZAO films with the minimum resistivity of 4.5x10^-4Ω•㎝, the transmittance in visible region above 80% and the reflectivity in IR region above 70% are gained.

Abstract: To prepare the amorphous SiO₂ optical fiber preform which has lower attenuation, we selected TEOS as raw material, H₂O as menstruum, HCl as catalyst, CH3NO as anti-cracking agent, prepared the mandrel material of SiO₂ optical fiber preform by sol-gel method. The XRD, SEM, FT-IR and TG were used to study the characteristic of the samples. The results show that the TEOS and H2O can be uniformly mixed with vigorous stirring and water increasing. The hydrolysis rate of TEOS will increase with the increasing HCl volume. The transparency will decrease when the HCl reaches a fixed value. The CH₃NO can play a role of anti-cracking agent, it also can affect the transparency if it is more. The optimal capability parameter TEOS: H₂O: HCl: CH₃NO = 1: 25: 0.5: 0.1. The optimal heat treatment process was determined by TG and FT-IR as follows: the temperature was risen slowly to 170°C and 300 °C for 1h, and then reluxed at 900°C for 2h.

Abstract: The NiOx thin flims deposited on SnO2/glass substrates by RF sputtering were investigated through XRD、SEM、spectrophotometer and Cyclic voltammetry. The relationship between electrochromic properties and micro-structure of NiOx was also studied. Results show that NiOx films prepared by sputtering are preferred to grow along (200) direction; the crystallize size of NiOx films increases and the transmittance of colored and bleached states of NiOx films also increases with annealing temperature rising, but the transmittance different between bleached and coloured states reduces. The declined electrochromic propertiey of NiOx with the increase of annealing temperature is also found.

Abstract: 0.2mm-thick high silicon steel thin sheet under 94% cold rolling reductions has been successfully produced by conventional rolling method. Texture evolution during hot rolling, cold rolling and final annealing as well as magnetic properties has been investigated with emphasis on the effect of finishing temperature. It is found that a favorable strong {001}<210> recrystallization texture and evidently improved magnetic properties can be obtained at the finishing temperature of 900°C, which is in contrast with relatively strong detrimental {111}<112> and weak {001}<210> recrystallization texture at the finishing temperature of 700°C. Effects of finishing temperature can be explained in terms of the cold rolling texture due to different texture morphology in hot bands.

Abstract: In this paper, a novel composite material of Acrylonitrile-Butadlene-Styrene resin (ABS)-based fabric coated with Cu/Ni-P was prepared via chemical redox plating technique. A series of such composite materials with varying thickness of Cu and Ni-P showed remarkable electromagnetic shielding ability. With the increase of Cu thickness, the shielding effect (SE) increased gradually, but leveled off after 1.5μm at a SE of about 70dB. Similarly, with the increase of the depth of Ni-P coats, the SE showed a trendency of gradual increase, and leveled off after 1.0μm at a SE of about 45dB. The optimum ABS/Cu/Ni-P was Cu 1.5μm and Ni-P 1.0μm unilaterally. The ABS/Cu/Ni-P composite material possessed excellent shielding ability in the range of 0.001-1000MHz at a stable SE of >80dB, and it also possessed ideal shielding effect in the range of >36GHz. But in the range of 10-18GHz, the shielding effect is slightly decreased gradually to about 60dB. So the ABS/Cu/Ni-P fabric composite is an ideal candidate for electromagnetic shielding material at low and high frequency radiations.