Fuzhou, China
Fuzhou, China

Fuzhou University is a university located in Fuzhou, China. Split into two campuses by the Min River, Fuzhou University's Old Campus is located on the north bank of the river in the western part of Fuzhou City, while the New Campus is located on the edge of the city on the south bank, at the base of Qi Mountain.The university excels in the fields of science and engineering nationally. It also has similar nationally recognized programs such as economics, management, arts and law. The university is part of the PRC national policy called Project 211 to enhance the development of the tertiary education system in mainland China. Wikipedia.

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The aim of this paper is to develop a closeness coefficient based nonlinear programming method for solving multiattribute decision making problems in which ratings of alternatives on attributes are expressed using interval-valued intuitionistic fuzzy (IVIF) sets and preference information on attributes is incomplete. In this methodology, nonlinear programming models are constructed on the concept of the closeness coefficient, which is defined as a ratio of the square of the weighted Euclidean distance between an alternative and the IVIF negative ideal solution (IVIFNIS) to the sum of the squares of the weighted Euclidean distances between the alternative and the IVIF positive ideal solution (IVIFPIS) as well as the IVIFNIS. Simpler nonlinear programming models are deduced to calculate closeness intuitionistic fuzzy sets of alternatives to the IVIFPIS, which are used to estimate the optimal degrees of membership and hereby generate ranking order of the alternatives. The derived auxiliary nonlinear programming models are shown to be flexible with different information structures and decision environments. The proposed method is validated and compared with other methods. A real example is examined to demonstrate applicability of the proposed method in this paper. © 2011 Elsevier B.V.

Increasing interest has been devoted to preparing gold nanoparticle (GNP) functionalized TiO 2 nanotube array (TNTA) nanocomposites (GNP/TNTA) for photocatalytic applications. Nonetheless, achieving accurate control of surface assemblies of GNPs tethered on the TNTA substrate is far from satisfactory. Thus, in our work, applying 3-mercaptopropionic acid (MPA) as an interconnecting ligand, tailor-made monodispersed GNPs are evenly deposited on the interior and exterior surfaces of TNTAs with significant monodispersity via a self-assembly approach. The intrinsic self-assembly mechanism leading to the GNP/TNTA hybrid nanostructure is highlighted and ascertained. The photocatalytic performances of GNP/TNTAs are systematically evaluated in the photodegradation of organic dye pollutants under UV light irradiation. The ensemble of results indicates that the hierarchical nanostructure of the GNP/TNTA nanocomposite obtained via this self-assembly approach exhibits remarkably enhanced photocatalytic performance compared to its counterparts of P25 particulate film, a flat anodic TiO 2 layer (FTL), and GNP/FTL, in which well-dispersed GNPs and conducting titanium substrate are proposed to play crucial roles as efficient "electron traps" for the transfer of the photogenerated electrons and thus retard the recombination of photogenerated electron-hole pairs during the harvesting of photon-energy. In addition, the detection of increased amounts of highly active species (especially hydroxyl radicals) on the GNP/TNTAs by photoluminescence (PL) and electron spin resonance spectra (ESR) techniques further confirms the proposed mechanism. It is hoped that our knowledge regarding this simple self-assembly approach may cast new insight into the design and fabrication of noble-metal NPs/1-D nanotubular semiconductor hybrid nanomaterials for a wide range of photocatalytic applications. © 2012 The Royal Society of Chemistry.

Interval-valued intuitionistic fuzzy (IVIF) sets are useful to deal with fuzziness inherent in decision data and decision-making processes. The aim of this paper is to develop a nonlinear-programming methodology that is based on the technique for order preference by similarity to ideal solution to solve multiattribute decision-making (MADM) problems with both ratings of alternatives on attributes and weights of attributes expressed with IVIF sets. In this methodology, nonlinear-programming models are constructed on the basis of the concepts of the relative-closeness coefficient and the weighted-Euclidean distance. Simpler auxiliary nonlinear-programming models are further deduced to calculate relative-closeness of IF sets of alternatives to the IVIF-positive ideal solution, which can be used to generate the ranking order of alternatives. The proposed methodology is validated and compared with other similar methods. A real example is examined to demonstrate the applicability and validity of the methodology proposed in this paper. © 2010 IEEE.

Xiao F.-X.,Fuzhou University
ACS Applied Materials and Interfaces | Year: 2012

In recent years, strenuous efforts have been devoted to exploring ZnO functionalized TiO2 nanotube arrays (ZnO/TNTs) nanocomposites; however, there is still a paucity of reports on the construction of well-defined ZnO/TNTs heterostructure via efficient and easily accessible approach. In this work, drawing on a two-step anodization combined pyrolysis strategy, we attained a highly ordered ZnO/TNTs hybrid nanostructure. Combined with a collection of characterizations including X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), diffusion reflectance spectrum (DRS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), we found that, in this coupling, in situ formed ZnO phases were uniformly grafted to TNTs framework giving rise to hybrid nanostructure, which is ascribed to cooperative interfacial interaction between polar TiO2 layer and ZnO precursor. The underlying interaction leading to judicious combination of TNTs and ZnO was unveiled by Fourier transformed infrared spectrum (FTIR) and XPS. Alternatively, it has been shown that ZnO nanocrystals distributed on the TNTs could serve as favorable hole channels and receptors for efficient separation of photoexcited charge carriers, which results in significantly enhanced photocatalytic performances of ZnO/TNTs heterostructure in comparison with pure TNTs, ZnO film, and P25 particulate film. Furthermore, it is found that the hybrid photocatalyst demonstrated excellent photostability. It is hoped that our work could present a straightforward paradigm for preparation of hierarchical semiconductor/1-D semiconductor heterostructures. © 2012 American Chemical Society.

The new role of graphene (GR) in boosting the two-electron reduction of O2 to H2O2 has been first identified in the GR-WO3 nanorod (NR) nanocomposite photocatalysts, which are fabricated by a facile, solid electrostatic self-assembly strategy to integrate the positively charged branched poly(ethylenimine) (BPEI)-GR (BGR) and negatively charged WO3 NRs at room temperature. Photoactivity test shows that, as compared to WO3 NRs, BGR-WO3 NRs with an appropriate addition ratio of GR exhibit remarkably enhanced and stable visible-light photoactivity toward the degradation of Rhodamine B. Besides the common roles of GR observed in the GR-based composite photocatalysts in the literature, including enhancing the visible-light absorption intensity, improving the lifetime and transfer of photogenerated charge carriers, and increasing the adsorption capacity for reactants, we have observed the new role of GR in boosting the two-electron reduction of O2 to H 2O2 in this specific BGR-WO3 NR photocatalyst system. Importantly, this new role of GR does contribute to the overall photoactivity enhancement of BGR-WO3 NR nanocomposites. The synergistic contribution of GR on improving the photoactivity of WO3 NRs and the underlying reaction mechanism have been analyzed by the structure-photoactivity correlation analysis and controlled experiments using radicals scavengers. © 2014 American Chemical Society.

Peptide-protein interactions have critical roles in biology. Monitoring peptide-protein interactions plays an important role in investigating molecular recognition, screening drugs, and designing biosensors. In this paper, we develop a novel fluorescent approach to monitor peptide-protein interactions based on the assembly of pyrene-labeled peptide and graphene oxide (GO). The pyrene-labeled peptide is strongly adsorbed on the surface of GO via π-π interactions and hydrophobic interactions. As a result, the proximity of the GO to the pyrene moiety effectively quenches the fluorescence of pyrene. In the presence of target protein, the competitive binding of the target protein with GO for peptide results in the restoration of fluorescence signal. This signaling mechanism makes it possible to monitor the peptide-protein interactions in a homogeneous real-time format.

Lin Z.,Fuzhou University | Wang X.,Fuzhou University
Angewandte Chemie - International Edition | Year: 2013

Going flat out: Simultaneous modifications of the textural, surface, and electronic structures of a rigid conjugated carbon nitride polymer has been achieved using direct co-condensation of urea and Ph4BNa. This method gives boron-doped carbon nitride nanosheets (see picture) that optimize the capture of light, improve the charge-separation kinetics, and enhance the surface reactivity for hydrogen photosynthesis. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

We have developed a facile and easily accessible layer-by-layer (LBL) self-assembly route to synthesize hierarchically ordered M/TNTs (M = Au, Ag, Pt) heterostructures. These integrated heterostructures show remarkably enhanced photoactivity and outstanding photostability; photoelectrochemical exploitations substantiated the contribution role of metal NPs acting as "electron reservoir" in prolonging the lifetime of photogenerated electron-hole charge carriers. In addition, these well-defined self-assembled hybrid systems can also be used as a promising catalyst for recycled selective catalytic reduction of 4-nitrophenol toward 4-aminophenol. The integration of high photoactivity and efficient catalytic reduction properties of the heterostructures lies crucially on the LBL self-assembly-induced monodispersivity of metal NPs on the framework of TNTs, and, particularly, the intimate interfacial contact between metal NPs and TNTs substrate arising from the pronounced electrostatic attractive interaction afforded by polyelectrolytes multilayering. Our results show that the design and utilization of highly ordered metal/1-D semiconductor hybrid nanostructures based on the facile LBL self-assembly strategy can find diverse catalytic applications. © 2012 American Chemical Society.

We have successfully developed a facile two-step anodization combined layer-by-layer (LBL) self-assembly route for rapid fabrication of well-defined metal-TiO 2 nanoring/nanotube combined nanostructures, i.e. M/T-NRNT (M = Au, Ag, Pt). These hierarchically self-assembled hybrid systems are demonstrated to exhibit versatile photocatalytic and catalytic reduction capabilities. © 2012 The Royal Society of Chemistry.

This present invention discloses a polymer/potassium permanganate composite film obtainable by a process comprising the steps of using silane coupling agent for surface treatment of potassium permanganate, mixing 0.15-0.75 g of modified potassium permanganate with 10-20 g of polymers together to obtain a mixture, and coating the mixture to obtain a composite film. The composite film can absorb ethylene generated by fruit, thus extending fruit ripening time, keeping fruit fresh. It can be widely used as food packaging materials. The composite film also has a good oxygen barrier property and has a good efficiency to remove bacteria. Therefore it can be widely used in the pharmaceutical industry. The preparation method is scientifically sound, simple, and has high level of operability, thus making it possible for batch preparation.

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