Critical adsorption at silicon surfaces in binary liquid mixtures

Cho, J.-H. J.; Law, Bruce M.

doi:10.1103/physreve.72.041601

Cited by 3 publications

(3 citation statements)

References 31 publications

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“…[8] provides a review of experimental results, more recent studies are found in Refs. [9][10][11][12][13][14][15]. While most theoretical investigations concern with adsorption on a plane [16][17][18][19][20][21][22], the case of a nonplanar geometry was studied in Refs.…”

Section: Order-parameter Profiles and Local Susceptibilitiesmentioning

confidence: 99%

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Critical behavior in the presence of an order-parameter pinning field

2017

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We apply a recently advocated simulation scheme that employs a local order-parameter pinning field to study quantum critical phenomena in the two-dimensional square-lattice bilayer quantum Heisenberg model. Using a world-line quantum Monte Carlo approach, we show that for this model, the pinning-field approach allows to locate the quantum critical point over a wide range of pinning-field strengths. However, the identification of the quantum critical scaling behavior is found to be hard since the pinning field introduces strong corrections to scaling. In order to further elucidate the scaling behavior in this situation, we also study an improved classical lattice model in the three-dimensional Ising universality class by means of Monte Carlo simulations on large lattice sizes, which allow us to employ refined finite-size scaling considerations. A renormalization group analysis exhibits the presence of an important crossover effect from the zero pinning-field to a critical adsorption fixed point. In line with field-theoretical results, we find that at the critical adsorption fixed point the shortdistance expansion of the order-parameter profile exhibits a new universal critical exponent. This result also implies the presence of slowly decaying scaling corrections, which we analyze in detail.

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Section: Order-parameter Profiles and Local Susceptibilitiesmentioning

confidence: 99%

“…[8] for a review, and Refs. [9][10][11][12][13][14][15] for more recent results), as well as theoretical investigations (see, e.g., Refs. [16][17][18][19][20][21][22][23][24][25][26]).…”

Section: Introductionmentioning

confidence: 99%

Critical behavior in the presence of an order-parameter pinning field

2017

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“…For adsorption experiments, especially on planar interfaces, it is essential that the surface be well cleaned and that the oxidation of the surface be reproducible, but to achieve this, researchers employ a wide variety of cleaning and treatment methods. For example, silica can be exposed to a gas flame or treated with a piranha solution (70% H 2 SO 4 and 30% H 2 O 2 ), , with UV ozone, or with different types of plasma such as air, nitrogen, argon, or oxygen . DeRosa et al compared a number of these methods (UV ozone and oxygen and H 2 O plasma).…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Surfactant-Mediated Desorption of Poly(vinylpyrrolidone) on Plasma- and Piranha-Cleaned Silica Surfaces

et al. 2014

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Optical flow cell reflectometry was used to study the adsorption of poly(vinylpyrrolidone) (PVP) to a silica surface and the subsequent surfactant adsorption and polymer desorption upon exposure to the anionic surfactant sodium dodecyl sulfate (SDS). We have studied these effects as a function of pH and surfactant concentration, but also for two different methods of silica preparation, O2 plasma and piranha cleaning. As a function of pH, a plateau in the amount adsorbed of ∼0.6 mg/m(2) is observed below a critical pH, above which the adsorption decreases to zero within 2-3 pH units. An increase in pH leads to dissociation of surface OH groups and a decreased potential for hydrogen bonding between the polymer and surface. For the plasma- and piranha-cleaned silica, the critical pH differs by 1-2 pH units, a reflection of the much larger amount of surface OH groups on piranha-cleaned silica (for a given pH). Subsequent rinsing of the adsorbed layer of PVP with an SDS solution leads to total or partial desorption of the PVP layer. Any remaining adsorbed PVP then acts as an adsorption site for SDS. A large difference between plasma- and piranha-cleaned silica is observed, with the PVP layer adsorbed to plasma-cleaned silica being much more susceptible to desorption by SDS. For a plasma-cleaned surface at pH 5.5, only 30% of the originally adsorbed PVP is remaining, while for piranha-cleaned silica, the pH can be increased to 10 before a similar reduction in the amount of adsorbed PVP is seen. For a given pH, piranha-cleaned silica has a higher surface charge, leading to a smaller amount of adsorbed SDS per PVP chain on a piranha-cleaned surface compared to a plasma-cleaned surface under identical conditions. In that way, the high negative surface charge makes desorption by negatively charged SDS more difficult. The high surface charge thus protects the neutral polymer from surfactant-mediated desorption.

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Comparison of critical adsorption scaling functions obtained from neutron reflectometry and ellipsometry

Brown

Law

Satija

et al. 2007

The Journal of Chemical Physics

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Carpenter et al. [Phys. Rev. E 59, 5655 (1999); 61, 532 (2000)] managed to explain ellipsometric critical adsorption data collected from the liquid-vapor interface of four different critical binary liquid mixtures near their demixing critical temperature using a single model. This was the first time a single universal function had been found which could quantitatively describe the surface critical behavior of many different mixtures. There have also been various attempts to investigate this surface critical behavior using neutron and x-ray reflectometries. Results have been mixed and have often been at variance with Carpenter et al. In this paper, the authors show that neutron reflectometry data collected from a crystalline quartz-critical mixture interface, specifically deuterated water plus 3-methylpyridine, can be quantitatively explained using the model of Carpenter et al. derived from ellipsometric data.

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Critical adsorption at silicon surfaces in binary liquid mixtures

Cited by 3 publications

References 31 publications

Critical behavior in the presence of an order-parameter pinning field

Critical behavior in the presence of an order-parameter pinning field

Adsorption and Surfactant-Mediated Desorption of Poly(vinylpyrrolidone) on Plasma- and Piranha-Cleaned Silica Surfaces

Comparison of critical adsorption scaling functions obtained from neutron reflectometry and ellipsometry

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