文献类型：期刊文献

英文题名：Controlling the Coffee Ring Effect on Graphene and Polymer by Cations

作者：Yang, Haijun[1,5];Yang, Yizhou[5,6];Sheng, Shiqi[5];Wen, Binghai[4];Sheng, Nan[1,5];Liu, Xing[2,3];Wan, Rongzheng[1,5];Yan, Long[5];Hou, Zhengchi[1,5];Lei, Xiaoling[1,5];Shi, Guosheng[2,3];Fang, Haiping[1,5,6]

机构：[1]Chinese Acad Sci, Shanghai Adv Res Inst, Zhangjiang Lab, Shanghai Synchrotron Radiat Facil,SSRF,ZJLab, Shanghai 201204, Peoples R China;[2]Shanghai Univ, Shanghai Appl Radiat Inst, Shanghai 200444, Peoples R China;[3]Shanghai Univ, State Key Lab Adv Special Steel, Shanghai 200444, Peoples R China;[4]Guangxi Normal Univ, Guangxi Key Lab Multisource Informat Min & Secur, Guilin 541004, Peoples R China;[5]Chinese Acad Sci, Shanghai Inst Appl Phys, Key Lab Interfacial Phys & Technol, Div Interfacial Water, Shanghai 201800, Peoples R China;[6]East China Univ Sci & Technol, Sch Sci, Shanghai 200237, Peoples R China

年份：2020

卷号：37

期号：2

外文期刊名：CHINESE PHYSICS LETTERS

收录：;EI(收录号：20220711653132);WOS:【SCI-EXPANDED(收录号:WOS:000510669600001)】；

基金：Supported by the National Natural Science Foundation of China under Grant Nos. U1632135, U1832170, 11862003, 11474299, 11574339, U1932123, and 11722548, the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (Nos. QYZDJ-SSW-SLH053 and QYZDJ-SSW-SLH019), and the Key Research Program of the Chinese Academy of Sciences (No. KJZD-EW-M03).

语种：英文

外文关键词：Positive ions - Substrates - Friction - Hydration - Molecular dynamics - Plastic bottles

摘要：Recently, there are great efforts that have been taken to suppressing/controlling the coffee ring effect, but it is of challenge to achieve inexpensive and efficient control with less disturbance, suitable for scalable production and highly enhancing the printing/dyeing color fastness. By only adding trace amounts of salt into the suspensions, here we experimentally achieve the facile and highly efficient control of the coffee ring effect of suspended matter on substrates of graphene, natural graphite, and polyethylene terephthalate surfaces. Notably, friction force measurements show that ion-controlled uniform patterns also greatly enhance color fastness. Molecular dynamics simulations reveal that, due to strong hydrated cation-pi interactions between hydrated cations and aromatic rings in the substrate surface, the suspended matters are adsorbed on the surfaces mediated by cations so that the suspended matters are uniformly distributed. These findings will open new avenues for fabricating functional patterns on graphene substrates and will benefit practical applications including printing, coating, and dyeing.