X-ray specular reflection studies of silicon coated by organic monolayers (alkylsiloxanes)

Tidswell, I. M.; Ocko, B. M.; Pershan, Peter S.; Wasserman, S.R.; Whitesides, George M.; Axe, J.D.

doi:10.1103/physrevb.41.1111

Cited by 362 publications

(310 citation statements)

References 41 publications

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“…14 Finally, we mention that the oxide-vacuum interface has a root mean square roughness of 3.5-5.1 Å, in agreement with similar oxide measurements. 15 In conclusion, we have used x-ray reflectivity to probe the Si/SiO 2 interface, revealing an interfacial layer with density higher than either crystalline Si or the main oxide layer. Quantitative values obtained for the excess scattering strength, a measure of the extent of this layer, is a function of the O 2 partial pressure of the growth environment in the as-grown oxide.…”

Section: ͓S0003-6951͑97͒02823-4͔mentioning

confidence: 99%

Evidence of annealing effects on a high-density Si/SiO2 interfacial layer

Kosowsky

Pershan

Krisch³

et al. 1997

Applied Physics Letters

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Section: ͓S0003-6951͑97͒02823-4͔mentioning

confidence: 99%

Evidence of annealing effects on a high-density Si/SiO2 interfacial layer

Kosowsky

Pershan

Krisch³

et al. 1997

Applied Physics Letters

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“…The water surface is set to coincide with the xy plane at z = 0. The interfacial electron density profile ρ(z) is described by the following equation [28]:…”

Section: Interfacial Modelsmentioning

confidence: 99%

Vaporization and layering of alkanols at the oil/water interface

Tikhonov¹,

Schlossman²

2007

J. Phys.: Condens. Matter

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This study of adsorption of normal alkanols at the oil/water interface with x-ray reflectivity and tensiometry demonstrates that the liquid to gas monolayer phase transition at the hexane/water interface is thermodynamically favorable only for long-chain alkanols. As the alkanol chain length is decreased, the change in excess interfacial entropy per area ΔS a σ decreases to zero. Systems with small values of ΔS a σ form multi-molecular layers at the interface instead of the monolayer formed by systems with much larger ΔS a σ . Substitution of n-hexane by n-hexadecane significantly alters the interfacial structure for a given alkanol surfactant, but this substitution does not change fundamentally the phase transition behavior of the monolayers. These data show that the critical alkanol carbon number, at which the change in excess interfacial entropy per area decreases to zero, is approximately six carbons larger than the number of carbons in the alkane solvent molecules.2

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“…6,12 The interface between each of these layers and an adjacent layer (or bulk) is roughened by capillary waves such that a single roughness parameter describes all the interfaces. The other fitting parameters include the electron density and thickness of each layer.…”

Section: Data and Analysismentioning

confidence: 99%

Tail Ordering Due to Headgroup Hydrogen Bonding Interactions in Surfactant Monolayers at the Water−Oil Interface

et al. 2006

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Interactions between surfactants, and the resultant ordering of surfactant assemblies, can be tuned by the appropriate choice of head-and tailgroups. Detailed studies of the ordering of monolayers of long-chain n-alkanoic and n-alkanol monolayers at the water-vapor interface have demonstrated that rigid-rod all-trans ordering of the tailgroups is maintained upon replacing the alcohol with a carboxylic acid headgroup. In contrast, at the water-hexane liquid-liquid interface, we demonstrate that substitution of the -CH 2 OH with the -COOH headgroup produces a major conformational change of the tailgroup from disordered to ordered. This is demonstrated by the electron density profiles of triacontanol (CH 3 (CH 2 ) 29 OH) and triacontanoic acid (CH 3 (CH 2 ) 28 COOH) monolayers at the water-hexane interface, as determined by X-ray reflectivity measurements. Molecular dynamics simulations illustrate the presence of hydrogen bonding between the triacontanoic acid headgroups that is likely responsible for the tail ordering. A simple free energy illustrates the interplay between the attractive hydrogen bonding and the ordering of the tailgroup.

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X-ray specular reflection studies of silicon coated by organic monolayers (alkylsiloxanes)

Abstract: Axe. 1990. X-ray specular reflection studies of silicon coated by organic monolayers (alkylsiloxanes). Physical Review B 41(2): 1111-1128.

Cited by 362 publications

References 41 publications

Evidence of annealing effects on a high-density Si/SiO2 interfacial layer

Evidence of annealing effects on a high-density Si/SiO2 interfacial layer

Vaporization and layering of alkanols at the oil/water interface

Tail Ordering Due to Headgroup Hydrogen Bonding Interactions in Surfactant Monolayers at the Water−Oil Interface

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