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Preparation and characterization of copper nanoparticles surface‐capped by alkanethiols
Author(s) -
Yang Guangbin,
Zhang Zhanming,
Zhang Shengmao,
Yu Laigui,
Zhang Pingyu,
Hou Yanchao
Publication year - 2013
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5309
Subject(s) - nanoparticle , ammonium bromide , transmission electron microscopy , copper , bromide , chemistry , fourier transform infrared spectroscopy , melting point , surface modification , nuclear chemistry , chemical engineering , analytical chemistry (journal) , materials science , inorganic chemistry , pulmonary surfactant , nanotechnology , organic chemistry , biochemistry , engineering
Cu nanoparticles surface‐capped by alkanethiols were synthesized using ligand exchange method in a two‐phase system. The effects of synthetic conditions, including the pH value of CuSO 4 solution, the ratio of cetyltrimethyl ammonium bromide to CuSO 4 , and reaction temperature, on the size and shape of as‐synthesized Cu nanoparticles were investigated. As‐synthesized Cu nanoparticles surface‐capped by alkanethiols with different chain lengths (C x S‐Cu) were characterized by means of X‐ray diffraction, transmission electron microscopy, Fourier transform infrared spectrometry, and ultraviolet–visible light spectrometry. The tribological behavior of C x S‐Cu as an additive in liquid paraffin was evaluated with a four‐ball machine. Results indicate that cetyltrimethyl ammonium bromide plays an important role in controlling the dispersion of Cu nanoparticles before adding modifier octanethiol into the reaction solution. C x S‐Cu nanoparticles as additive in liquid paraffin possess excellent antiwear and friction‐reduction performance because of the deposition of nano‐Cu with low melting point on worn steel surface leading to the formation of a self‐repairing protective layer thereon. Copyright © 2013 John Wiley & Sons, Ltd.