jp7b03645_si_005.avi (2.02 MB)
Matchstick-Like Cu2S@CuxO Nanowire Film: Transition of Superhydrophilicity to Superhydrophobicity
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posted on 2017-08-22, 00:00 authored by Cailong Zhou, Huijing Li, Jing Lin, Kun Hou, Zhijie Yang, Pihui Pi, Shouping Xu, Xiufang Wen, Jiang ChengWe
fabricated a matchstick-like Cu2S@CuxO nanowire film on copper mesh by applying a Cu(OH)2 nanowires template-sacrificial method, which can transformed
from superhydrophilic to superhydrophobic just after storage in air
for a certain period without any further organic modification. The
surface morphology, chemical composition and the wettability were
investigated by Scanning Electron Microscopy (SEM), X-ray diffractometer
(XRD), Raman, X-ray Photoelectron Microscopy (XPS), and contact angle
measurement. Results showed that the change of surface chemical composition
and the trapped air among the matchstick-like structures were the
decisive factors for the wettability transition. Therefore, on-demand
oil/water separation was achieved, which was performed by using the
superhydrophilic–underwater superoleophobic mesh for separating
light oil/water mixtures and the superhydrophobic one for separating
heavy oil/water mixtures.