Effect of anion on micro/nano-tribological properties of ultra-thin imidazolium ionic liquid films on silicon wafer

Zhao, Wenjie; Zhu, Min; Mo, Yufei; Bai, Ming

doi:10.1016/j.colsurfa.2008.09.025

Cited by 55 publications

(51 citation statements)

References 27 publications

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“…This provides greater resistance to tip sliding, leading to higher coefficient of friction values. It is worth noting that comparable results were obtained by other groups who performed AFM-based adhesion and friction measurements on untreated IL films on silicon [74][75][76][77][78]. The role of meniscus formation in the adhesive and friction forces obtained for the uncoated Si and the untreated, partially bonded and fully bonded lubricant-coated Si surfaces is depicted in the schematic at the lower portion of Fig.…”

Section: Nanotribological Studiessupporting

confidence: 79%

A Review of Ionic Liquids for Green Molecular Lubrication in Nanotechnology

2010

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Common industrial lubricants include natural and synthetic hydrocarbons and perfluoropolyethers (PFPEs), where the latter is widely used in commercial applications requiring extreme operating conditions due to their high temperature stability and extremely low vapor pressure. However, PFPEs exhibit low electrical conductivity, making them undesirable in some nanotechnology applications. Ionic liquids (ILs) have been explored as lubricants for various device applications due to their excellent electrical conductivity as well as good thermal conductivity, where the latter allows frictional heating dissipation. Since they do not emit volatile organic compounds, they are regarded as ''green'' lubricants. In this article, we review the different types of ILs and their physical properties responsible for lubrication. We also discuss their suitability as lubricants, since the long-term performance of ILs as lubricants may be affected by issues such as corrosion, oxidation, tribochemical reactions, and toxicity. We present nanotribological, electrical, and spectroscopic studies of IL films along with conventional tribological investigations, recognizing that understanding the tribological performance at various length scales is a crucial step in selecting and designing effective lubricants.

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Section: Nanotribological Studiessupporting

confidence: 79%

A Review of Ionic Liquids for Green Molecular Lubrication in Nanotechnology

2010

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“…Table 1 lists hydrophilic and hydrophobic ILs used in this study. All ILs used were purchased from Tokyo Chemical Industry Co. (Tokyo, Japan) and were ultrapurified to make them usable for SEM (Jimenez and Bermudez, 2009;Wilkes and Zaworotko, 1992;Zhao et al, 2009). We followed the newly developed protocol for SEM with IL (Ishigaki et al, 2011a), with slight modifications.…”

Section: Methodsmentioning

confidence: 99%

Comparative study of hydrophilic and hydrophobic ionic liquids for observing cultured human cells by scanning electron microscopy

Ishigaki¹,

Nakamura²,

Takehara³

et al. 2011

Microscopy Res & Technique

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An ionic liquid (IL) is a salt that remains in the liquid state at room temperature. It does not vaporize under vacuum and imparts electrical conductivity to samples for observation by scanning electron microscopy (SEM). Recently, the usefulness of ILs has been widely recognized. In our previous study, one of the ILs 1-ethyl-3-methylimidazolium tetrafluoroborate (EtMelm(+) BF(4)(-)) was used for SEM analysis of biological samples. In comparison with the conventional method, samples prepared using EtMelm(+) BF(4)(-) provided more detailed SEM images of the cell ultrastructure, enabling the observation of protrusions. In addition, the IL treatment is a less time consuming and simple method that does not include dehydration, drying, and conductivity treatments, which are an essential parts of the conventional method. In this study, we compared the usefulness of four hydrophobic and three hydrophilic ILs for SEM to observe fixed cultured human A549 cells. All ILs worked well to prevent "charge-up" effect for SEM observation. However, the hydrophilic ILs tended to provide clearer images than the hydrophobic ILs. We concluded that various ILs can be used for SEM sample preparation and their application to a wide range of fields is anticipated in future.

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“…To study surface morphology of thin films on a micro-and a nano-scale, atomic force microscopy (AFM) is considered as an excellent tool [14,15]. The surface roughness of one bilayer DR/PAA-CNTs film and five bilayers films on mica was visualized using AFM in tapping mode, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Study of Poly(Acrylic Acid)–Carbon Nanotube Self-Assembly Films

Lia

Yanb

Penga

2011

Designed Monomers and Polymers

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A poly(acrylic acid)-carbon nanotube (PAA-CNT) was successfully prepared. The fabrication of selfassembly films from diazoresin and PAA-CNTs was confirmed with UV-Vis spectrometry. Thickness of the films was regularly increased by a layer-by-layer self-assembly process. Furthermore, the ionic bonds in the polymer films converted to covalent bonds under UV irradiation, with the decomposition of diazoresin group. Finally, the surface morphology of the films was investigated by atomic force microscopy. The films are rather flat and uniform through the self-assembly technique.

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Effect of anion on micro/nano-tribological properties of ultra-thin imidazolium ionic liquid films on silicon wafer

Cited by 55 publications

References 27 publications

A Review of Ionic Liquids for Green Molecular Lubrication in Nanotechnology

A Review of Ionic Liquids for Green Molecular Lubrication in Nanotechnology

Comparative study of hydrophilic and hydrophobic ionic liquids for observing cultured human cells by scanning electron microscopy

Study of Poly(Acrylic Acid)–Carbon Nanotube Self-Assembly Films

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