Solvent-dependent critical properties of polymer adsorption

Plascak, J. A.; Martins, P. H. L.; Bachmann, Michael

doi:10.1103/physreve.95.050501

Cited by 16 publications

(38 citation statements)

References 34 publications

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“…It is important to notice that the estimate of φ (s) is highly dependent on the precise location of the adsorption point, but no such argument can be made for the method of estimating 1/δ (s) . However, it is also important to highlight that the presence of strong finitesize corrections seriously affects exponent estimates for the ordinary surface transition, having recently led to claims of non-universality in the case of self-avoiding walks [10,16]. We also find evidence for strong finite-size corrections at the special point.…”

Section: Resultsmentioning

confidence: 60%

“…Recently, there has been renewed interest in the polymer adsorption transition. In [10,16], it was argued based on numerical simulations in three dimensions, that the generally accepted scaling theory for polymer adsorp- * Electronic address: nathan.rodrigues@ufv.br † Electronic address: t.prellberg@qmul.ac.uk ‡ Electronic address: owczarek@unimelb.edu.au tion in terms of a single crossover exponent may break down in the presence of bulk interactions. Specifically, it was claimed that the exponent involved in the temperature scaling of the free energy around the adsorption critical point is distinct from the exponent describing the scaling of the order parameter at this critical point, and moreover that these two exponents are not universal with respect to varying the strength of the bulk interactions.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of interacting self-avoiding trails in two dimensions

2019

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We investigate the surface adsorption transition of interacting self-avoiding square lattice trails onto a straight boundary line. The character of this adsorption transition depends on the strength of the bulk interaction, which induces a collapse transition of the trails from a swollen to a collapsed phase, separated by a critical state. If the trail is in the critical state, the universality class of the adsorption transition changes; this is known as the special adsorption point. Using flatPERM, a stochastic growth Monte Carlo algorithm, we simulate the adsorption of self-avoiding interacting trails on the square lattice using three different boundary scenarios which differ with respect to the orientation of the boundary and the type of surface interaction. We confirm the expected phase diagram, showing swollen, collapsed, and adsorbed phases in all three scenarios, and confirm universality of the normal adsorption transition at low values of the bulk interaction strength. Intriguingly, we cannot confirm universality of the special adsorption transition. We find different values for the exponents; the most likely explanation is that this is due to the presence of strong corrections to scaling at this point.

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Section: Resultsmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Adsorption of interacting self-avoiding trails in two dimensions

2019

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“…2 we show the s-T phase diagram from Ref. [18] (black circles) augmented with our estimates of the SAG-AE transition transformed to the same parameters (red squares). The blue dotted lines are the transformed schematic phase boundaries from Fig.…”

Section: Simulations and Resultsmentioning

confidence: 99%

“…Numerical simulation is thus a useful tool in this field and can be applied to other questions. For the effect of the bulk interaction on polymer adsorption, recent work by Plascak et al [18,19] has suggested that altering the strength of the bulk interactions with respect to the surface interactions has a significant effect on φ and the critical temperature T ads . For the case where the bulk interaction is made increasingly repulsive the critical temperature decreases slightly from the noninteracting case.…”

Section: Introductionmentioning

confidence: 99%

Phase transitions in solvent-dependent polymer adsorption in three dimensions

2019

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We consider the phase diagram of self-avoiding walks (SAW) on the simple cubic lattice subject to surface and bulk interactions, modeling an adsorbing surface and variable solvent quality for a polymer in dilute solution, respectively. We simulate SAWs at specific interaction strengths to focus on locating certain transitions and their critical behavior. By collating these new results with previous results we sketch the complete phase diagram and show how the adsorption transition is affected by changing the bulk interaction strength. This expands on recent work considering how adsorption is affected by solvent quality. We demonstrate that changes in the adsorption crossover exponent coincide with phase boundaries.

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“…At higher temperatures, where entropic effects dominate, the polymer was found to desorb, assuming an extended conformation (DE). The effect of solvent conditions on polymer conformations near the surface have also been studied using lattice models of a grafted polymer on a surface 42 . Under good solvent conditions, a grafted polymer on a flat surface is adsorbed on the surface at low temperatures, while it assumes a desorbed conformation at higher temperatures.…”

Section: Introductionmentioning

confidence: 99%

Confined crowded polymers near attractive surfaces

Tripathi

Menon

Vemparala

2019

The Journal of Chemical Physics

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We present results from molecular dynamics simulations of a spherically confined neutral polymer in the presence of crowding particles, studying polymer shapes and conformations as a function of the strength of the attraction to the confining wall, solvent quality and the density of crowders. The conformations of the polymer under good solvent conditions are seen to be largely independent of crowder particle density, even when the polymer is strongly confined. In contrast, under poor solvent conditions, when the polymer assumes a collapsed conformation when unconfined, it can exhibit transitions to two different adsorbed phases, when either the interaction with the wall or the density of crowder particles is changed. One such transition involves a desorbed collapsed phase change to an adsorbed extended phase as the attraction of the polymer towards the confining wall is increased. Such an adsorbed extended phase can exhibit a second transition to an ordered adsorbed collapsed phase as the crowder particle density is increased. The ordered adsorbed collapsed phase of the polymer differs significantly in its structure from the desorbed collapsed phase. We revisit the earlier understanding of the adsorption of confined polymers on attractive surfaces in the light of our results.

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Solvent-dependent critical properties of polymer adsorption

Cited by 16 publications

References 34 publications

Adsorption of interacting self-avoiding trails in two dimensions

Adsorption of interacting self-avoiding trails in two dimensions

Phase transitions in solvent-dependent polymer adsorption in three dimensions

Confined crowded polymers near attractive surfaces

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