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- W2090902403 abstract "The interfacial properties of <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$n$</tex></formula> -alkylsilane monolayers on silicon were investigated by normal force spectroscopy, lateral force measurements, and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. Monolayers of <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$(hbox{CH}_{3}{( hbox{CH}_{2})}_{n - 1}hbox{SiCl}_{3})$</tex></formula> with chain lengths <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$n = 5$</tex></formula> , 8, 12, and 18 were prepared and NEXAFS spectra were used to compute the dichroic ratio, <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$R_{rm I}$</tex></formula> . As <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$n$</tex> </formula> decreased from 18 to 5, the film structures change from ordered <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$(R_{ rm I} = 0.41)$</tex></formula> to disordered <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$(R_{rm I} = 0.12)$</tex></formula> states. Normal force spectroscopy data were analyzed with a modified elastic adhesive contact model to extract Young's modulus, <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$E_{rm film}$</tex></formula> , and the work of adhesion, <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$w$</tex></formula> , of the film; <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$E_{rm film}$</tex></formula> decreased from 1.2 to 0.67 GPa, and <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$w$</tex></formula> increased from 48.6 to 60.1 <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$hbox{mJ}cdothbox{m}^{-2}$</tex></formula> as <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$n$</tex></formula> decreased from 18 to 5. Lateral force measurements quantified the reduction in friction via an interfacial shear strength, <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$tau$</tex> </formula> , and a lateral deformation analog, <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$eta$</tex></formula> . Monolayer adsorption reduced <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$tau$</tex></formula> from 3500 MPa for <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$hbox{SiO}_{2}$</tex></formula> to less than 50 MPa for <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$n = 12$</tex></formula> and 18 alkylsilanes and was dependent on contact pressure. Conversely, <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$eta$</tex></formula> was pressure invariant, with values of <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$approx$</tex></formula> 3500 MPa for <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$n = 5$</tex></formula> and 8 and <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$approx$</tex></formula> 1000 MPa for <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$n = 12$</tex></formula> and 18. <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$hfill$</tex> </formula> [2012-0165]" @default.
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- W2090902403 date "2013-02-01" @default.
- W2090902403 modified "2023-09-27" @default.
- W2090902403 title "Interfacial Mechanical Properties of $n$ -Alkylsilane Monolayers on Silicon Substrates" @default.
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- W2090902403 doi "https://doi.org/10.1109/jmems.2012.2213798" @default.
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