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    Controllable synthesis of in situ grown titanate hierarchical microspheres and subsequent chemical modifications for superhydrophobic and oil-water separation properties

    Year: 2020

    Journal: RSC Adv., Volume 10, MAR 19, page 11182–11187

    Authors: Li, Yong; Xie, Jiyang; Guo, Changjin; Wang, Jian; Liu, Huan; Hu, Wanbiao

    Organizations: National Key R&D Program of China [2017YFB0406300]; Natural Science Foundations of ChinaNational Natural Science Foundation of China (NSFC) [51702281, 21773205]; Key R&D program of Yunnan Province [2018BA068]; "One Thousand Youth Talents" Program of China

    Sodium titanate nanowire-assembled microspheres on titanium mesh have been synthesized through controlling an over the surface acidification and hydrothermal process in terms of a proposed in situ "nucleation-cum-growth" solution chemistry strategy. These directly grown microspheres crystallize in an orthorhombic lepidocrocite layered structure of sodium titanate with the composition of Na1.8Ti1.95 square O-0.05(4.8) (square similar to vacancy) determined by the XRD, Raman and SEM-EDX techniques. An individual microsphere has a uniform size of around 10 microns while the constituent nanowires have a diameter of 100 nm growing along the [110] orientation. Owing to the specially well-defined hierarchical structure and robust in situ interfaces, these titanate nanowire-assembled microspheres, after 2,2,3,3,4,4,5,5-octafluoro-1-pentanol (OFP) surface modification, could achieve superhydrophobicity. This work demonstrates an in situ "nucleation-cum-growth" synthesis strategy and facile functionalization towards superhydrophobicity for oil-water separation, which might extend to a broad variety of oxide nanowire systems to fabricate well-defined structures for wettability tailoring and multi-functional applications.
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