TiO2 nanocrystals/graphene （TiO2/GR） composite are prepared by combining flocculation and hydrothermal reduction technology using graphite oxide and TiO2 colloid as precursors. The obtained materials are examined by...TiO2 nanocrystals/graphene （TiO2/GR） composite are prepared by combining flocculation and hydrothermal reduction technology using graphite oxide and TiO2 colloid as precursors. The obtained materials are examined by scanning electron microscopy, transition electron microscopy, X-ray diffraction, N2 adsorption desorption, and ultraviolet-visible diffuse spectroscopy. The results suggest that the presence of TiO2 nanocrystals with diameter of about 15 nm prevents GR nanosheets from agglomeration. Owing to the uniform distribution of TiO2 nanocrystals on the GR nanosheets, TiO2/GR composite exhibits stronger light absorption in the visible region, higher adsorption capacity to methylene blue and higher efficiency of charge separation and transportation compared with pure TiO2. Moreover, the TiO2/GR composite with a GR content of 30% shows higher photocatalytic removal efficiency of MB from water than that of pure TiO2 and commercial P25 under both UV and sunlight irradiation.展开更多
α-Fe_2O_3 nanocrystal was encapsulated by a block-copolymer, hydroxylated poly (styrene-b- butadiene-styrene) (HO-SBS) to fabricate composite microspheres with α-Fe_2O_3 cores and HOSBS shell. Its film fabricated o...α-Fe_2O_3 nanocrystal was encapsulated by a block-copolymer, hydroxylated poly (styrene-b- butadiene-styrene) (HO-SBS) to fabricate composite microspheres with α-Fe_2O_3 cores and HOSBS shell. Its film fabricated on n-Si wafer acts as the insulator layer in the metal-insulator- semiconductor(MIS) structure. The capacitance-voltage (C-V) properties were measured to characterize the composite particulate films.展开更多
Poly（3-hydroxybutyrate-co-3-hydroxyvalerate）（PHBV）/chitin nanocrystals（CNC） composite scaffolds were synthesized by the salt leaching and thermally induced phase separation（TIPS） technique.The scaffolds have p...Poly（3-hydroxybutyrate-co-3-hydroxyvalerate）（PHBV）/chitin nanocrystals（CNC） composite scaffolds were synthesized by the salt leaching and thermally induced phase separation（TIPS） technique.The scaffolds have porous structures with macro-pores（100-300 μm in diameters） and micro-pores（10μm）.The surface characteristics of the scaffolds were characterized by X-ray photoelectron spectroscopy（XPS） and static water contact angle measurement,and the mechanical properties were investigated by a compression test.Human adipose-derived stem cells（hADSCs） were seeded onto the PHBV/CNC scaffolds and in vitro cell culture results showed that the composite scaffolds enhanced the hADSCs adhesion,which implies that the material may have potential application in tissue engineering.展开更多
Pyrex glasses with different ZnS: Mn^(2+) contents were prepared by melting method. It has been found that Mn ion may occupy two sites: (Mn^(2+) )sub and (Mn^(2+) )int from photoluminescene (PL) and photoluminescence ...Pyrex glasses with different ZnS: Mn^(2+) contents were prepared by melting method. It has been found that Mn ion may occupy two sites: (Mn^(2+) )sub and (Mn^(2+) )int from photoluminescene (PL) and photoluminescence excitation (PLE) spectra. The results were confirmed by the further electron paramagnetic resonance (EPR) experiments and the three types of states (Mn^(2+) )sub, (Mn^(2+) )int and Mn clusters were identified. It was observed that the g-factor and the hyperfine structure (HFS) constant increase with the decreasing size of nanocrystallite. This may result from hybridization of sp3 electron states of ZnS and 3d5 electron states of Mn by the effects of quantum confinement and the surface states.展开更多
文摘TiO2 nanocrystals/graphene （TiO2/GR） composite are prepared by combining flocculation and hydrothermal reduction technology using graphite oxide and TiO2 colloid as precursors. The obtained materials are examined by scanning electron microscopy, transition electron microscopy, X-ray diffraction, N2 adsorption desorption, and ultraviolet-visible diffuse spectroscopy. The results suggest that the presence of TiO2 nanocrystals with diameter of about 15 nm prevents GR nanosheets from agglomeration. Owing to the uniform distribution of TiO2 nanocrystals on the GR nanosheets, TiO2/GR composite exhibits stronger light absorption in the visible region, higher adsorption capacity to methylene blue and higher efficiency of charge separation and transportation compared with pure TiO2. Moreover, the TiO2/GR composite with a GR content of 30% shows higher photocatalytic removal efficiency of MB from water than that of pure TiO2 and commercial P25 under both UV and sunlight irradiation.
基金the National Natural Science Foundation of China
文摘α-Fe_2O_3 nanocrystal was encapsulated by a block-copolymer, hydroxylated poly (styrene-b- butadiene-styrene) (HO-SBS) to fabricate composite microspheres with α-Fe_2O_3 cores and HOSBS shell. Its film fabricated on n-Si wafer acts as the insulator layer in the metal-insulator- semiconductor(MIS) structure. The capacitance-voltage (C-V) properties were measured to characterize the composite particulate films.
基金Ministry of Science and Technology of the People's Republic of China(No.1106)Ningbo Science Foundation (No.2011A610116)+1 种基金National Key Basic Research Program of China(973,No.2014CB643305)the China Postdoctoral Science Foundation Funded Project(No.2012T50564) for financial support
文摘Poly（3-hydroxybutyrate-co-3-hydroxyvalerate）（PHBV）/chitin nanocrystals（CNC） composite scaffolds were synthesized by the salt leaching and thermally induced phase separation（TIPS） technique.The scaffolds have porous structures with macro-pores（100-300 μm in diameters） and micro-pores（10μm）.The surface characteristics of the scaffolds were characterized by X-ray photoelectron spectroscopy（XPS） and static water contact angle measurement,and the mechanical properties were investigated by a compression test.Human adipose-derived stem cells（hADSCs） were seeded onto the PHBV/CNC scaffolds and in vitro cell culture results showed that the composite scaffolds enhanced the hADSCs adhesion,which implies that the material may have potential application in tissue engineering.
基金Project supported by the National Natural Science Foundation of ChinaLaboratory of Excited State Processes, Chinese Academy of Sciences
文摘Pyrex glasses with different ZnS: Mn^(2+) contents were prepared by melting method. It has been found that Mn ion may occupy two sites: (Mn^(2+) )sub and (Mn^(2+) )int from photoluminescene (PL) and photoluminescence excitation (PLE) spectra. The results were confirmed by the further electron paramagnetic resonance (EPR) experiments and the three types of states (Mn^(2+) )sub, (Mn^(2+) )int and Mn clusters were identified. It was observed that the g-factor and the hyperfine structure (HFS) constant increase with the decreasing size of nanocrystallite. This may result from hybridization of sp3 electron states of ZnS and 3d5 electron states of Mn by the effects of quantum confinement and the surface states.
