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Janus graphene oxide nanosheets prepared via Pickering emulsion template
Affiliation:1. Department of Applied Chemistry, School of Science, Tianjin University of Commerce, Tianjin 300134, PR China;2. Department of Chemistry, Tianjin University, Tianjin 300072, PR China;1. Department of Environmental Engineering, National Chung Hsing University, Taichung, Taiwan, ROC;2. Department of Chemical Engineering, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan, ROC;3. Department of Chemical Engineering, Imperial College London, South Kensington Campus, Exhibition Road, London SW7 2AZ, UK;1. Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, People’s Republic of China;2. School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, People’s Republic of China;1. Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology, Xi’an, 710021, China;2. College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi’an, 710021, Shaanxi, China;3. College of Chemistry and Chemical Engineering, Yantai University, Yantai, 264005, Shandong, China;4. National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi’an, 710021, Shaanxi, China
Abstract:Janus graphene oxide (GO) nanosheets functionalized by amino-containing chemicals were prepared via Pickering emulsion template. A wax-in-water Pickering emulsion was used to mask one side of GO nanosheets in order to achieve asymmetric chemical functionalization. Janus particles were obtained by removing the oil phase. The successful reaction of epoxy groups on the surface of GO with amino-containing chemicals was confirmed by Fourier transform infrared spectroscopy (FT-IR) and thermal gravimetric analysis (TGA). The asymmetric surface structure of Janus GO nanosheets was detected by atomic force microscope (AFM) and X-ray diffraction (XRD). The efficient stabilization of an oil-in-water Pickering emulsion by Janus GO was proved. Polymer microspheres fabricated by using Janus GO as Pickering stabilizer had a more hydrophilic surface compared with those stabilized by symmetrically modified GO.
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