Morphology and Wettability of [Bmim] [PF6] Ionic Liquid on HOPG Substrate

We investigate the morphology and wettability of [Bmira][PF6] ionic liquid （IL） on a highly oriented pyrolitic graphite （HOPG） substrate using atomic force microscopy. Thin films, nanometer-sized droplets, and ＂drop-onlayer＂ structures of the IL are found on the substrate. Films with a thickness of...

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Published inChinese physics letters Vol. 27; no. 8; pp. 125 - 128
Main Author 张福春 沙茂林 任秀平 吴国忠 胡钧 张益
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.08.2010
Subjects
Atomic structure
Droplets
Graphite
HOPG
Ionic liquids
Liquids
Morphology
Thin films
Wettability
原子力显微镜
形态
润湿性
白细胞介素
离子液体
纳米尺度
衬底
Online AccessGet full text
ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/27/8/086101

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Abstract We investigate the morphology and wettability of [Bmira][PF6] ionic liquid （IL） on a highly oriented pyrolitic graphite （HOPG） substrate using atomic force microscopy. Thin films, nanometer-sized droplets, and ＂drop-onlayer＂ structures of the IL are found on the substrate. Films with a thickness of up to 2nm （about 4 IL layers） show the solid-like behavior. In contrast, a dewetting phenomenon is observed for thicker IL films, indicating that the IL films retain liquid properties. The contact angle of a buck IL droplet on the HOPG is measured to be about 35°. The wettability of the bulk IL droplet on the HOPG is found to be quite different from that of IL films. These results indicate that the IL molecules can be organized into various micro-morphologies when they are confined to a solid substrate and show characteristic behavior at nanometer scales.
AbstractList We investigate the morphology and wettability of [Bmim][PF6] ionic liquid (IL) on a highly oriented pyrolitic graphite (HOPG) substrate using atomic force microscopy. Thin films, nanometer-sized droplets, and 'drop-on-layer' structures of the IL are found on the substrate. Films with a thickness of up to 2 nm (about 4 IL layers) show the solid-like behavior. In contrast, a dewetting phenomenon is observed for thicker IL films, indicating that the IL films retain liquid properties. The contact angle of a buck IL droplet on the HOPG is measured to be about 35 degree . The wettability of the bulk IL droplet on the HOPG is found to be quite different from that of IL films. These results indicate that the IL molecules can be organized into various micro-morphologies when they are confined to a solid substrate and show characteristic behavior at nanometer scales.
We investigate the morphology and wettability of [Bmira][PF6] ionic liquid （IL） on a highly oriented pyrolitic graphite （HOPG） substrate using atomic force microscopy. Thin films, nanometer-sized droplets, and ＂drop-onlayer＂ structures of the IL are found on the substrate. Films with a thickness of up to 2nm （about 4 IL layers） show the solid-like behavior. In contrast, a dewetting phenomenon is observed for thicker IL films, indicating that the IL films retain liquid properties. The contact angle of a buck IL droplet on the HOPG is measured to be about 35°. The wettability of the bulk IL droplet on the HOPG is found to be quite different from that of IL films. These results indicate that the IL molecules can be organized into various micro-morphologies when they are confined to a solid substrate and show characteristic behavior at nanometer scales.
Author 张福春 沙茂林 任秀平 吴国忠 胡钧 张益
AuthorAffiliation Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800 Department of Chemistry and Chemical Engineering, Hefei Normal University, Hefei 230061 Graduate School of the Chinese Academy of Sciences, Beijing 100049
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Snippet We investigate the morphology and wettability of [Bmira][PF6] ionic liquid （IL） on a highly oriented pyrolitic graphite （HOPG） substrate using atomic force...
We investigate the morphology and wettability of [Bmim][PF6] ionic liquid (IL) on a highly oriented pyrolitic graphite (HOPG) substrate using atomic force...
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SubjectTerms Atomic structure
Droplets
Graphite
HOPG
Ionic liquids
Liquids
Morphology
Thin films
Wettability
原子力显微镜
形态
润湿性
白细胞介素
离子液体
纳米尺度
衬底
Title Morphology and Wettability of [Bmim] [PF6] Ionic Liquid on HOPG Substrate
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