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      Surfactant-Free and Controlled Synthesis of Hexagonal CeVO 4 Nanoplates: Photocatalytic Activity and Superhydrophobic Property

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          Abstract

          Nanomaterials with both superhydrophobic surface properties as well as photocatalytic activities could have important industrial applications. Herein, we synthesized CeVO 4 nanocrystals with hexagonal nanoplate structures from the reaction of decavanadate (K 6V 10O 28⋅9 H 2O) and CeCl 3⋅H 2O precursors via a hydrothermal method. This synthetic route has four advantages: 1) the reaction condition is relatively mild, 2) it doesn′t need surfactants or templates, 3) it requires no expensive equipment, and 4) products are of higher purity. During synthesis, solution pH, and reaction temperature were found to play important roles in determining the growth process and final morphologies of the CeVO 4 products. These products were characterized spectrophotometrically and via scanning and transmission electron microscopy. Furthermore, the wettability of the as-synthesized film CeVO 4 nanoplates was studied by measuring water contact angle (CA). The largest CA measured was at 169.5 ° for a glass substrate treated with 0.06 g mL −1 CeVO 4 followed by 2 % 1 H, 1 H, 2 H, 2 H-perfluorodecyltriethoxysilane. Finally, the CeVO 4 nanoplates exhibited excellent photocatalytic activity in degradation of rhodamine B (RhB) under UV irradiation and was stable even after repeated cycles of use.

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          Most cited references32

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          Single-nanowire electrically driven lasers.

          Electrically driven semiconductor lasers are used in technologies ranging from telecommunications and information storage to medical diagnostics and therapeutics. The success of this class of lasers is due in part to well-developed planar semiconductor growth and processing, which enables reproducible fabrication of integrated, electrically driven devices. Yet this approach to device fabrication is also costly and difficult to integrate directly with other technologies such as silicon microelectronics. To overcome these issues for future applications, there has been considerable interest in using organic molecules, polymers, and inorganic nanostructures for lasers, because these materials can be fashioned into devices by chemical processing. Indeed, amplified stimulated emission and lasing have been reported for optically pumped organic systems and, more recently, inorganic nanocrystals and nanowires. However, electrically driven lasing, which is required in most applications, has met with several difficulties in organic systems, and has not been addressed for assembled nanocrystals or nanowires. Here we investigate the feasibility of achieving electrically driven lasing from individual nanowires. Optical and electrical measurements made on single-crystal cadmium sulphide nanowires show that these structures can function as Fabry-Perot optical cavities with mode spacing inversely related to the nanowire length. Investigations of optical and electrical pumping further indicate a threshold for lasing as characterized by optical modes with instrument-limited linewidths. Electrically driven nanowire lasers, which might be assembled in arrays capable of emitting a wide range of colours, could improve existing applications and suggest new opportunities.
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            Fabrication of superhydrophobic surfaces with high and low adhesion inspired from rose petal.

            Certain rose petals are known to be superhydrophobic with high adhesion. There also exist rose petals which are superhydrophobic with low adhesion similar to lotus leaf. The purpose of this study is to characterize systematically the superhydrophobic rose petal with high and low adhesion surfaces and understand the mechanism for adhesion characteristics. Based on these, artificial superhydrophobic surfaces with high and low adhesion are fabricated using a two-step molding process and wax evaporation method. It is shown that the pitch values of microstructures and density of nanostructures play an important role in real rose petals and artificial surfaces to control their adhesion properties.
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              A thermodynamic approach for determining the contact angle hysteresis for superhydrophobic surfaces.

              Contact angle hysteresis (CAH) is critical to superhydrophobicity of a surface. This study proposes a free energy thermodynamic analysis (of a 2-D model surface) that significantly simplifies calculations of free energy barrier associated with CAH phenomena. A microtextured surface with pillar structure, typical of one used in experimental studies, is used as an example. We demonstrate that the predicted CAH and equilibrium contact angles are consistent with experimental observations and predictions of Wenzel's and Cassie's equations, respectively. We also establish a criterion for transition between noncomposite and composite wetting states. The results and methodology presented can potentially be used for designing superhydrophobic surfaces.
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                Author and article information

                Journal
                ChemistryOpen
                ChemistryOpen
                open
                ChemistryOpen
                John Wiley & Sons, Ltd (Chichester, UK )
                2191-1363
                2191-1363
                June 2015
                30 March 2015
                : 4
                : 3
                : 288-294
                Affiliations
                [a ]College of Chemistry, Key Lab of Environment Friendly Chemistry and Application of the Ministry of Education, Xiangtan University Xiangtan, 411105, P. R. China
                Author notes
                Article
                10.1002/open.201402163
                4522178
                a9b566b1-0ff6-43b8-a61a-974354ad5fd8
                © 2015 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

                This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

                History
                : 22 December 2014
                Categories
                Full Papers

                cevo4,hexagonal,nanoplates,photocatalytic degradation,superhydrophobicity

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