Time filter

Source Type

Bai X.,Heilongjiang Academy of Science | Bai X.,Heilongjiang University | Li J.,Heilongjiang University
Materials Research Bulletin | Year: 2011

Hexagonal ZnIn 2S 4 porous microspheres were synthesized via a cetylpyridinium bromide (CPBr)-assisted hydrothermal method. The structure, morphology and optical property of these prepared products were characterized by wide angle X-ray diffraction (WAXRD), small angle X-ray diffraction (SAXRD), UV-Vis diffusive reflectance spectroscopy (DRS), field emission scanning electron microscopy (FESEM), energy dispersive X-ray analyzer (EDX) and nitrogen sorption analysis. The effects of CPBr and pH on the crystal structure, morphology and photocatalytic activity of ZnIn 2S 4 products were studied. The results demonstrated that the flowerlike ZnIn 2S 4 microspheres, which were composed of numerous nanosheets, performed higher visible-light photocatalytic activity than bulk ZnIn 2S 4 for hydrogen evolution. The CPBr addition influenced the crystal structure including the position and intensity of some peaks. Furthermore, the pH played a crucial role in the formation of ZnIn 2S 4 porous microspheres. The as-synthesized porous ZnIn 2S 4 microspheres possessed the specific surface area of 165.4 m 2 g -1 and the slit-like porous configuration, which was beneficial to photocatalytic reaction. © 2011 Elsevier Ltd. All rights reserved.

Chen Z.,University of Alberta | Chen Z.,Heilongjiang Academy of Science | Hu L.,University of Alberta | Serpe M.J.,University of Alberta
Journal of Materials Chemistry | Year: 2012

We present a new method to synthesize hydrogel particles by exploiting the interface formed between two immiscible liquids. Spherical monomer droplets, of varying diameters, could be suspended at the planar interface formed between two immiscible liquids. While suspended, polymerization could proceed, after which the hydrogel particles that were formed could be collected. Using this approach, we were able to synthesize particles containing various monomers/co-monomers including: N-isopropylacrylamide, 2-hydroxyethyl methacrylate, and N-(3-aminopropyl)methacrylamide hydrochloride. The approach also allowed for the facile encapsulation of various inorganic nanoparticles and small molecules, including: Au nanoparticles, Ag nanoparticles, magnetic cobalt (Co) nanoparticles, tris(4-(dimethylamino)phenyl)methylium chloride (crystal violet) and fluorescein isothiocyanate isomer I (FITC). The benefit of this approach is the ability to load polymer particles with a wide variety of moieties without the need to optimize any reaction conditions. So long as the species to be encapsulated in the particle are soluble in water, and minimally soluble in the solvents used to form the interface, they will be incorporated in the polymerized particle. This journal is © 2012 The Royal Society of Chemistry.

Gao J.,Heilongjiang University | Wang L.,Heilongjiang University | Kan K.,Heilongjiang University | Kan K.,Heilongjiang Academy of Science | And 6 more authors.
Journal of Materials Chemistry A | Year: 2014

The mesoporous Al2O3-In2O3 composites with one-dimensional (1D) nanofibres (NFs) have been fabricated via a facile one-step synthesis of the electrospinning approach, followed by appropriate thermal treatment under ambient conditions. The composite nanomaterials display high dispersion of both In2O3 and Al2O3, forming a heterostructure and mesoporous tubular structure in a broad Al:In atomic ratio up to 1:4. It has been found that the Al2O3 composite tube-like nanostructures not only increase efficient sites for gas adsorption, but also possess higher donor densities. Moreover, the mesoporous structure also provides effective and fast channels for fast capturing and migration of electrons. The results show that the mesoporous Al2O3-In2O3 nanotubes exhibit excellent sensing properties to NOx down to a detection limit of 291 ppb at room temperature (RT), while containing 20 at% Al2O 3 (labeled as meso-20AI NTs) with an average diameter of nanoparticles of about 10 nm. With respect to the 97 ppm NOx, the maximum response of 100 was determined, 7.3 times as high as the pure In 2O3 NTs. Owing to its unique composite structure, 1D meso-20AI NTs may be promising for application in gas sensors. © 2014 The Royal Society of Chemistry.

Dong Z.,Henan Normal University | Yuwen Y.,Henan Normal University | Wang Q.,Henan Normal University | Chen G.,Henan Normal University | Liu D.,Heilongjiang Academy of Science
Gene Expression Patterns | Year: 2012

Dugesia japonica has become the suitable model system for studying the visual system molecular developmental processes because of their simple structure and high regenerative capacity. To further dissect the molecular events of genetic network controlling the visual system regeneration in D. japonica, we investigated the morphogenesis of regenerating eyes under the stereomicroscope and the transcripts expression levels of eight genes involved in this process by quantitative real-time PCR. The eight genes were Djeya, Djsix-1, Eye53, DjotxA, Djpax6, Djopsin, Djnetrin and 1020HH. The results showed that each gene was of different expression pattern at distinct regeneration stage and these eight genes could be divided into three groups according to the expression levels at different time points and the morphogenesis during eye reconstruction: (1) the early expression group, including Djeya, Djsix-1, Eye53, and DjotxA, which expression levels were significant increase from 1 to 3 days after amputation; (2) the medium-term expression group, only including one gene, Djpax6, which expression level reached the peak on day 5; and (3) the late expression genes, including Djopsin, Djnetrin and 1020HH, which gradually increase transcription with the eye regeneration. Our data suggested that eye reconstruction was the results of polygenic services and the genes in the same group might have similar role or function in symphony. © 2011 Elsevier B.V. All rights reserved.

Bai X.-F.,Heilongjiang Academy of Science | Cao Y.,Heilongjiang University | Wu W.,Heilongjiang University
Renewable Energy | Year: 2011

The H2 production rate from H2S photocatalytic decomposition under visible light irradiation (λ > 400 nm) over CdS nanoparticules formed in HY-zeolite pore (named CdS/HY) was much higher compared to the commercial bulk CdS. The CdS/HY photocatalyst was characterized by UV-Vis, XRD, FT-IR, N2 adsorption, SEM and HRTEM. The blue shift from bulk which confirmed CdS nanoparticles located in the pore of HY-Zeolite (named HY). Photocatalytic activity and surface area were enhanced by such structures. © 2010 Elsevier Ltd.

Discover hidden collaborations