Microtribological Characterization of Self-Assembled and Langmuir-Blodgett Monolayers by Atomic and Friction Force Microscopy

Bhushan, Bharat; Kulkarni, Ashok V.; Koinkar, Vilas N.

doi:10.1021/la00008a052

Cited by 204 publications

(119 citation statements)

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“…The superiority of covalent bonding can be reflected by comparing with another popular candidate for MEMS/NEMS lubricant of Langmuir-Blodgett (LB) film, which attaches to the substrate via weak van der Waal force. As expected, SAMs is found to be much more stable against shear stress and possesses better wear resistance as compared with LB film with similar composition and structures (Bliznyuk et al, 1998;Bushan et al, 1995;DePalma & Tillman, 1989;Kim et al, 1999;Overney et al, 1992;Peach et al, 1996;b,Tsukruk et al, 1996;Tsukruk, 2001.). As shown in Fig.…”

Section: The Influence Of Headgroupssupporting

confidence: 62%

Construction of Various Self-assembled Films and Their Application as Lubricant Coatings

Wang¹,

Ou²,

Ren³

et al. 2011

New Tribological Ways

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Section: The Influence Of Headgroupssupporting

confidence: 62%

Construction of Various Self-assembled Films and Their Application as Lubricant Coatings

Wang¹,

Ou²,

Ren³

et al. 2011

New Tribological Ways

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“…A number of other groups have now used this method to form multilayer films of gold particles [117] , polymer-capped platinum colloidal particles [118] , bulky balls [119] . The Brust synthesis procedure [7] wherein gold nanoparticles are synthesized and capped with alkanethiols in a nonpolar organic phase continues to be the most popular means of obtaining hydrophobic gold nanoparticles that are readily dispersible in different nonpolar/weakly polar organic solvents [120] .…”

Section: Thiol-stabilised Gold Nanoparticlesmentioning

confidence: 99%

Plasmonic Nanoparticles and Their Conjugates: Preparation, Optical Properties and Antimicrobial Activity

Capek¹,

Internationals²

2015

JNMS

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To manipulate the size of noble metal particles on a nanometer scale are priority subjects in the field of nanotechnology. So far various approaches have been developed to synthesize noble metal nanoparticles in controlled sizes and dimensions. Among them the colloidal systems become broadly used. These systems can be made up of several very different reactants and solvents: a continuous medium water or alkane, surfactant and precursor(s). In some systems the formation of (sub) nanoparticles is based on the supersaturation of solution by reactants. The existence of the microenvironments gives them a particular ability to modulate the chemical reactivity of the reactants due to their compartmentalization in different microenvironments. The size and shape of noble metal nanoparticles follow the feed composition of reactants in the precursor solution, the reaction conditions and concentration and type of reactants. Surface modification and functionalization is expected to increase the stability of nanoparticles and organize them to the assembly of higher order array conjugates. Various soft and hard templates can be applied to produce noble metal nanoparticles in different shaped nanoreactors. Monodisperse gold nano crystals can grow inside soft templates and the cavities of hard templates by the reduction of metal ions trapped in the cavities. The interesting optical properties of noble metal nanoparticles and their (bio)conjugates results from the strong absorption in the visible spectrum region, so called the surface plasmon absorption. Some noble metal nanoparticles have been studied for their antimicrobial potential and have proven to be antibacterial and antiviral agents.

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Section: Citationmentioning

confidence: 99%

“…These properties make them good candidates for use in micro/nano devices. Alkylsilane SAM films have therefore been extensively studied, and proposed as lubricants for MEMS [15][16][17][18]. It is known that roughness has a significant effect on the friction characteristics of solid surfaces [19][20][21].…”

mentioning

confidence: 99%

Tunable water-based lubrication behavior of alkyl- and fluoroalkyl-silanes

Liu

Xiao

2012

Chin. Sci. Bull.

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In this paper, we report the tribological properties of self-assembled molecular (SAM) films of fluoroalkylsilanes and non-fluoroalkylsilanes, with different chain-lengths, adsorbed on Si substrate surfaces by covalent bonds. The SAM films were characterized using a universal ball-disk experimental tester in aqueous solutions. The substrate surface was examined by X-ray photoelectron spectroscopy (XPS), and the SAM films adsorbed on the Si surfaces were inspected by contact angle measurements and XPS. Lubrication studies revealed that several kinds of fluoroalkylsilanes had similar friction coefficients; the small differences were attributed to the chain flexibility. In contrast, differences in the aqueous lubrication properties of SAM films of non-fluoroalkylsilanes were clearly identified. It is suggested that substitution with fluorine atoms and the surface affinities of fluoroalkylsilanes contributed to redistribution of surface changes, causing variations in lubrication behaviors. water-based lubrication, wettability, self-assmebled molecular films Citation:Liu Y H, Liu P X, Xiao Y Q. Tunable water-based lubrication behavior of alkyl-and fluoroalkyl-silanes. Chin Sci Bull, 2012, 57: 18791885, doi: 10.1007/s11434-012-5106-2Friction is a common phenomenon in engineering, and much energy is wasted because of serious friction or wear between moving parts. Much effort has been devoted to controlling energy dissipation during surface interactions. Also, micro/nano-electromechanical systems (MEMS/ NEMS), the use of which has increased in recent decades, have many other tribological problems [1][2][3][4]. As the dimensions of a system decrease, the surface area/volume ratio increases. This could cause surface forces such as adhesion and friction to predominate over inertial forces [5]. Tribological limitations such as stiction, friction, and wear are major problems that limit the efficiency, power output, and reliability of these devices [6][7][8].Although Si is the material most used in MEMS/NEMS components, the tribological performance of Si is very poor . Nanometer-thick organic self-assembled molecular (SAM) films are potential candidates as lubricants for improving the performance of MEMS and NEMS. Recently, much attention has been paid to self-assembled monolayers because they are easy to prepare, and they have excellent properties such as low thickness, stable physical and chemical properties, and good covalent bonding with substrates [9]. Moreover, the properties of SAM films can be extended by changing the lengths of the molecules, the type of terminal group, and the degree of cross-linking within the layer. In particular, fluorinated organic thin-films have been much studied because of their unique chemical stabilities and anti-adhesive properties [10][11][12]. Organosilane ultrathin films have been identified as promising boundary lubricants. This is because organosilane molecules interact strongly with substrates and their thicknesses are commensurate with the dimensions of the structures in these appl...

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Microtribological Characterization of Self-Assembled and Langmuir-Blodgett Monolayers by Atomic and Friction Force Microscopy

Cited by 204 publications

References 0 publications

Construction of Various Self-assembled Films and Their Application as Lubricant Coatings

Construction of Various Self-assembled Films and Their Application as Lubricant Coatings

Plasmonic Nanoparticles and Their Conjugates: Preparation, Optical Properties and Antimicrobial Activity

Tunable water-based lubrication behavior of alkyl- and fluoroalkyl-silanes

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