Effects of nanorod structure and conformation of fatty acid self-assembled layers on superhydrophobicity of zinc oxide surface

Badre, Chantal; Dubot, Pierre; Lincot, Daniel; Pauporté, Thierry; Turmine, Mireille

doi:10.1016/j.jcis.2007.07.046

Cited by 72 publications

(52 citation statements)

References 38 publications

(24 reference statements)

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“…The difference between the trans-alkenyl elaidic and cis-alkenyl oleic acid isomers has been noted by several authors in the contexts of adsorption [61], friction [14] and contact angle [62]. Elaidic acid, with an alkyl group arranged in a trans-geometry across the C=C double bond is able to adopt an almost linear configuration and thus form a close-packed monolayer structure in a similar fashion, though not quite as effectively as, stearic acid.…”

Section: Discussionmentioning

confidence: 91%

In Situ Study of Model Organic Friction Modifiers Using Liquid Cell AFM; Saturated and Mono-unsaturated Carboxylic Acids

et al. 2015

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Fatty acids and their derivatives have been used as model organic friction modifiers for almost a century, but there is still debate as to the nature of the boundary films that they form on rubbed surfaces. In this study, in situ liquid cell atomic force microscopy (AFM) is used to monitor the self-assembly of boundary films from solutions of fatty acids in alkanes on to mica surfaces. Because the mica surfaces are wholly immersed in solution it is possible to study directly changes in the morphology and friction of these films over time and during heating and cooling.It has been found that stearic and elaidic acid, that are able to adopt a linear molecular configurations, form irregular islands on mica that are tens to hundreds of microns in diameter and typically 1.6 nm thick, corresponding to domains of tilted single monolayers. At a relatively high concentration of 0.01M, stearic acid in hexadecane forms an almost complete monolayer, but at lower concentrations, in dodecane solution and for elaidic acid solutions these films remain incomplete after prolonged immersion of more than a day. The films formed by fatty acids on mica are displaced by repeated scanning in contact mode AFM but can be imaged without damage using tapping mode AFM.Rubbed quartz surfaces from a sliding ball-on-disc test were also scanned ex-situ using AFM and these showed that stearic acid forms similar monolayer island films on quartz in macroscale friction experiments as are found on mica.Oleic acid solutions behave quite differently from stearic acid and elaidic acid, forming irregular globular films on both mica and rubbed quartz surfaces. This is believed to be because its cis-double bond geometry means that, unlike its trans-isomer elaidic acid or saturated stearic acid, it is unable to adopt a linear molecular configuration and so is less able to form close-packed monolayers.

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Section: Discussionmentioning

confidence: 91%

In Situ Study of Model Organic Friction Modifiers Using Liquid Cell AFM; Saturated and Mono-unsaturated Carboxylic Acids

et al. 2015

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“…ZnO has been widely utilized due to its optoelectronic, piezoelectric, transparent and large band gap properties for potential applications in UV detector [4], chemical and biological sensors [5,6], solar cells [7], piezoelectric materials [8], and low friction/wear coatings for wide temperature range sliding applications [9,10]. A ZnO surface is generally known to be hydrophilic [11,12]. However, a highly hydrophilic ZnO nanorod array surface could be transformed into a superhydrophobic surface by chemical modification of the surface by coating it with octdecanethiol [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…However, a highly hydrophilic ZnO nanorod array surface could be transformed into a superhydrophobic surface by chemical modification of the surface by coating it with octdecanethiol [13,14]. Also, Badre et al [12] reported that the a ZnO is an important material that is used in a variety of technologies including optical devices, sensors, and other microsystems. In many of these technologies, wettability is of great concern because of its implications in numerous surface related interactions.…”

Section: Introductionmentioning

confidence: 99%

Wetting characteristics of ZnO smooth film and nanowire structure with and without OTS coating

Lin

Kim

2008

Applied Surface Science

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“…Recently, there have been many reports on the use of zinc oxide (ZnO) for the fabrication of superhydrophobic surfaces [22][23][24][25][26][27][28]. Hydrophobic modification of ZnO films has been carried out with long-chain fatty acids or their sodium salts [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of superhydrophobic sol–gel composite films using hydrophobically modified colloidal zinc hydroxide

Lakshmi

Basu

2009

Journal of Colloid and Interface Science

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Effects of nanorod structure and conformation of fatty acid self-assembled layers on superhydrophobicity of zinc oxide surface

Cited by 72 publications

References 38 publications

In Situ Study of Model Organic Friction Modifiers Using Liquid Cell AFM; Saturated and Mono-unsaturated Carboxylic Acids

In Situ Study of Model Organic Friction Modifiers Using Liquid Cell AFM; Saturated and Mono-unsaturated Carboxylic Acids

Wetting characteristics of ZnO smooth film and nanowire structure with and without OTS coating

Fabrication of superhydrophobic sol–gel composite films using hydrophobically modified colloidal zinc hydroxide

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