Synergistic effect of surfactant and saccharin on dispersion and crystal refinement for electrodeposition of nanocrystalline nickel/graphene oxide composite
Synergistic effect of surfactant and saccharin on dispersion and crystal refinement for electrodeposition of nanocrystalline nickel/graphene oxide composite
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表面活性剂和糖精对纳米晶镍/氧化石墨烯复合材料电沉积分散和晶体细化的协同作用
DOI：
10.1016/j.surfcoat.2020.126292
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发表时间：
2020-11
影响因子：
5.4
通讯作者：
Fengzhou Fang
中科院分区：
文献类型：
--
作者：
Honggang Zhang;Nan Zhang;Fengzhou Fang
氧化石墨烯（GO）在氨基磺酸镍溶液中的均匀分散是电沉积高性能镍/GO复合涂层的重大挑战。本文采用阴离子表面活性剂十二烷基硫酸钠（SDS）、阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）、非离子表面活性剂聚乙二醇（PEG）和糖精三种典型的表面活性剂分散GO纳米颗粒，细化Ni/GO复合镀层的晶粒尺寸。从表面活性剂和糖精在镍/GO复合镀层中的分散、晶粒细化以及对镀层力学性能和摩擦学性能的影响等方面揭示了表面活性剂和糖精的协同作用。结果表明，PEG对GO的分散性最好，其次是CTAB和SDS.在电解质中添加糖精不影响GO颗粒的表面电荷，但它有助于减小GO的粒度，从而减少潜在的再聚集。此外，PEG显示出微晶尺寸从约35 nm至约19 nm的最显著减小。表面活性剂和糖精的协同效应通过用各种表面活性剂将糖精的浓度从0增加到0.2g/L来表示，其中总体微晶尺寸逐渐减小。此外，PEG-GO和CTAB-GO涂层的硬度显着增加，分别为252%和312%，相比于纯镍涂层。增加的硬度是由于添加GO和糖精两者的晶体细化的协同效应。摩擦学试验表明，当糖精的添加量为0.2 g/L时，PEG-GO涂层的摩擦系数降低最大，达到0.15。
Homogeneous dispersion of graphene oxide (GO) in nickel sulfamate solution is a significant challenge for electrodepositing high-performance nickel/GO composite coatings. In the present work, three typical surfactants, including anionic surfactant Sodium dodecyl sulfate (SDS), cationic surfactant Cetyltrimethylammonium bromide (CTAB), and non-ionic surfactant Polyethylene glycol (PEG), and saccharin are used to disperse GO nanoparticles and refine crystallite size of nickel/GO composite coating. The synergistic effect of surfactant and saccharin is revealed from the perspectives of dispersion, crystal refinement and their impact on mechanical and tribological properties of nickel/GO composite coating. Our results indicate that PEG possesses the optimal dispersibility to GO dispersion, followed by CTAB and SDS. The addition of saccharin in electrolyte does not affect the surface charge of GO particles, but it helps to reduce the particle size of GO and thus reduce potential reaggregation. Additionally, PEG shows the most significant reduction of crystallite size from ~35 nm to ~19 nm. The synergetic effect of surfactant and saccharin is indicated by increasing the concentration of saccharin from 0 to 0.2 g/L with various surfactants, where the overall crystallite size is gradually reduced. Moreover, the hardness of PEG-GO and CTAB-GO coatings is remarkably increased by 252% and 312%, respectively, compared to pure nickel coating. The increased hardness is due to the synergistic effect of crystal refinement from both additions of GO and saccharin. The tribological test indicates that the PEG-GO coating can achieve the maximum reduction of friction coefficient with 0.15 with the addition of saccharin of 0.2 g/L.
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影响因子：
5
作者：
Carpenter, C. R.;Shipway, P. H.;Zhu, Y.
通讯作者：
Zhu, Y.
影响因子：
3.9
作者：
Yi Fan;Yi He;P. Luo;Shi Taihe;Xi Chen
通讯作者：
Yi Fan;Yi He;P. Luo;Shi Taihe;Xi Chen
影响因子：
8.4
作者：
Honggang Zhang;N. Zhang;F. Fang
通讯作者：
Honggang Zhang;N. Zhang;F. Fang
使用星形图案表征微型器件微注射成型的微结构的可制造性
影响因子：
2.3
作者：
Hou, Jian;Zhang, Honggang;Fang, Fengzhou
通讯作者：
Fang, Fengzhou
影响因子：
0.5
作者：
Blanton, Thomas N.;Majumdar, Debasis
通讯作者：
Majumdar, Debasis