Advanced Materials Research Vols. 399-401

Abstract: Highly dispersed ZnO/TiO₂ nanotube composites (NTCs) were successfully synthesized via a facile ethylenediamine-assisted deposition-precipitation route. This NTCs were characterized by XRD, TEM, and photcatalytic testing.The results revealed that hexagonal wurtzite phase ZnO NPs with an average size of about 2 nm were homogeneously dispersed and anchored on the surface of TiO₂ nanotubes (NTs) to form ZnO/TiO₂ NTCs, which exhibited excellent photocatalytic activity for photodegradation of methyl orange (MO) compared with P25 and Pure TiO₂ NTs. Furthermore, ZnO/TiO₂ NTCs possessed very favorable recycle efficiency due to their relatively high sedimentation rate and only slightly decrease of photocatalytic activity after a six- time recycle.

Abstract: 5-nitro-1,10-phenanthroline together with its Eu(III) complex were encapsulated into three kinds of silica hosts. The inorganic-organic hybrid materials were red emissive and presented various emissions under the base or acid catalysis. In addition, the thermal stabilities were enhanced compared with organic complex.

Abstract: The microstructure of catalyst discs and fracture topography of boron-doped diamond blocks are analyzed in this paper. The results show that boron can promote or inhibit the growth of diamond crystal. The battens of metal carbides in catalyst are the main carbon source in the nucleation and growth of diamond. Crystal nucleus can absorb the carbon atoms from metal carbide in catalyst disc, and continually grow. It is resulted that the carbon atoms around the diamond grains in catalyst disc reduce, and the battens of metal carbides are thin. The more diamond grains are produced, the thinner battens of metal carbides in catalyst disc are formed.

Abstract: The orange fluorescent compound 2-[2-(p-toluenesulphonylamino)-5-chlorophenyl]-6- chloro-4H-3,1-benzoxazin-4-one (Cl-TSB) was synthesized by reacting 2-amino-5-chlorobenzoic acid with p-toluenesulphonyl chloride. The strong photoluminescent peak was at 544 nm in solid film. HOMO and LUMO energy levels were calculated -5.00 and -1.82 eV. The multilayer organic light-emitting devices (OLEDs) ITO/NPB/Cl-TSB/BCP/TPBi or Alq3/LiF/Al were fabricated. The electroluminescent peaks of all devices were at ca. 620 nm with luminance of over 100 cd/m². The characteristics of devices demonstrated that Cl-TSB was an orange emitter suitable for OLED.

Abstract: In this paper, a kind of RHA-paraffin phase change material was prepared, and the SEM was used for observing its internal morphologies, DSC analysis was carried out for detecting its temperature and enthalpy of phase transition. The results showed that rice husk ash have a greater absorption rate for paraffin; a large number of pores of the RHA were filled by paraffin in the RHA-paraffin phase change material, and the absorption rate can reach 53.5%.

Abstract: Na₂O-CaO-SiO₂ flat glasses were prepared with traditional melt-quenching methods.The effect of different fining glass agent,such as Na₂SO₄,Ce₂(CO₃)₃,Rare earth composite fining agent,and content on the fining and decolourizing of glass was studied. In addition,the effect of rare-earth composite glass fining agent on the fining and decolourizing of molten glass was analyzed.Mechanism of fining was discussed.Comparative results indicate that composite agent is better than a single agent on the effect of clarification and decolourization.increasing the transparency of glass,glass’s strength was increased largely.

Abstract: P(AA-co-DMAA) superporous drug-loaded hydrogels containing berberine hydrochloride were prepared by dispersion polymerization in foam system with acrylic acid (AA) and N,N-dimethyl acrylamide (DMAA) as monomers. Then sodium alginate (SA) as the second network was added to the system, and P(AA-co-DMAA)/SA interpenetrating polymer network (IPN) hydrogels were formed. The effects of pH value, reaction time between SA and glutaric dialdehyde (GA), the concentration of SA and GA on release behavior of berberine hydrochloride were discussed. The FT-IR spectra showed that P(AA-co-DMAA)/SA IPN hydrogels were synthesized successfully. The inverted fluorescence micrograph of P(AA-co-DMAA)/SA showed that some part of the superporous structures were still retained.The cumulative release profiles showed that the release rates were slightly higher in pH=6.8 phosphate buffer solution (PBS) than the one in pH=1 HCl solution. The release rate was the slowest in distilled water, only 7.3% within 24h. When the reaction time between SA and GA was shortened, the release speed of berberine hydrochloride became faster. The pore size of P(AA-co-DMAA) hydrogels was reduced with the concentration of SA and GA increased, and the release rate decreased due to the more dense network structures.

Abstract: The phosphors Sr₃B₂O₆: Ce³⁺, Sr₃B₂O₆: Tb³⁺ and Sr₃B₂O₆: Ce³⁺, Tb³⁺ were synthesized by the solid-state reaction method at high temperature. For the phosphor Sr₃B₂O₆: Ce³⁺, the lowest 5d levels, the emission and the Stokes shifts of Ce³⁺ in the host lattice were identified. In addition, its concentration quenching process was also studied. For the phosphor Sr₃B₂O₆: Tb³⁺, the f-d transitions of Tb³⁺ in the host lattice were assigned and discussed. Moreover, the energy transfer phenomenon between Ce³⁺ and Tb³⁺ in Sr₃B₂O₆: Ce³⁺, Tb³⁺ was discussed. The emission of Tb³⁺ is significantly enhanced due to energy transfer from Ce³⁺ to Tb³⁺ when Ce³⁺, Tb³⁺ dopants were used together in Sr₃B₂O₆.

Abstract: Two types of 60° perfect dislocation in Cd_0.9Zn_0.1Te single crystals were observed by HRTEM. The Burger’s vector of the two dislocation were and respectively. With reasonable premise, the possible dissociation mechanisms of the two kinds of dislocations were supposed to be and . There are two kinds of the formation mechanisms, the first one is the accumulation of the point defects and the other kind of dislocation is the lattice gliding caused by the thermal stress.

Abstract: A novel unsymmetrical diarylethene derivative 1-[2-methyl-5-(4-pyridine)-3-thienyl]-2-[2-methyl-5-(4-hydroxylphenyl)-3-thienyl]hexafluorocyclopentene (1a) was successfully synthesized. The properties of the compound, including photochromic and fluorescence properties of the diarylethene were also investigated systematically. The results showed that absorption maxima of this compound were observed at 606 nm in methanol and at 612 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light. In methanol solution, the open-ring isomer of the diarylethene 1 exhibited relatively fluorescence at 499 nm when excited at 414 nm. This new photochromic compound also exhibited remarkable optical storage character.