两性离子和离子单体与石墨烯表面的相互作用,Langmuir

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两性离子和离子单体与石墨烯表面的相互作用
Langmuir ( IF 3.7 ) Pub Date : 2018-05-23 00:00:00 , DOI: 10.1021/acs.langmuir.8b00975
Suguna Perumal , Atchudan Raji ₁ , In Woo Cheong

Affiliation

两种材料之间相互作用力的测量提供了有关各种特性的重要信息，例如吸附，粘合或与涂料，附着力和复合材料的相容性。通过原子力显微镜（AFM）在空气和水中系统地研究了两性离子和离子单体与石墨薄片（G）和还原的氧化石墨烯（rGO）表面的相互作用力。检验的单体为2-（甲基丙烯酰氧基）乙基2-（三甲基铵）乙基磷酸酯（MPC），[2-（甲基丙烯酰氧基）乙基]二甲基-（3-磺丙基）氢氧化铵（SBE），[2-（丙烯酰氧基）乙基]三甲基氯化铵（ATC）和2-甲基-2-丙烯-1-磺酸钠（MSS）。AFM研究表明，具有磺酸盐单元的MSS和SBE单体与空气中的G表面具有更强的相互作用力，具有季铵单元的MPC和ATC单体在水中具有更高的相互作用力。在rGO表面的情况下，无论使用哪种介质，具有季铵单元的单体都表现出更强的相互作用。这些相互作用可以通过单体与石墨烯表面之间的相互作用机理来合理化，例如MPC和ATC的阳离子-π和MSS和SBE的阴离子-π。总的来说，阳离子-π相互作用在水中有效，而阴离子-π相互作用在具有G表面的空气中有效。MGO，SBE，ATC和MSS在rGO上的附着力值低于在G表面测得的附着力值。在单体中，MPC对石墨烯水性分散液显示出最高的分散性。进一步，

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Interaction of Zwitterionic and Ionic Monomers with Graphene Surfaces

Measurement of the interaction force between two materials provides important information on various properties, such as adsorption, binding, or compatibility for coatings, adhesion, and composites. The interaction forces of zwitterionic and ionic monomers with graphite platelets (G) and reduced graphene oxide (rGO) surfaces were systematically investigated by atomic force microscopy (AFM) in air and water. The monomers examined were 2-(methacryloyloxy)ethyl 2-(trimethylammonio)ethyl phosphate (MPC), [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide (SBE), [2-(acryloyloxy)ethyl]trimethylammonium chloride (ATC), and 2-methyl-2-propene-1-sulfonic acid sodium (MSS). The AFM studies revealed that MSS and SBE monomers with sulfonate units have stronger interaction forces with G surface in air and that MPC and ATC monomers with quaternary ammonium units have higher interaction forces in water. In the case of rGO surface, the monomers with quaternary ammonium units showed stronger interactions regardless of the medium. These interactions could be rationalized by the interaction mechanism between the monomers with graphene surfaces, such as cation−π for MPC and ATC and anion−π for MSS and SBE. Overall, cation−π interactions were effective in water, whereas anion−π interactions are effective in air with G surface. The adhesion values of MPC, SBE, ATC, and MSS on rGO were lower than the values measured on G surface. Among the monomers, MPC showed the highest dispersibility for aqueous graphene dispersions. Further, the adsorption of MPC on G and rGO surfaces was verified by high-resolution transmission electron microscopy and X-ray diffraction patterns.

更新日期：2018-05-23

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