Study on the adsorption process of a semi-flexible polymer onto homogeneous attractive surfaces

Yang, Xiao; Yang, Qinghui; Fu, Yang; Wu, Fan; Huang, Jianhua; Luo, Meng‐Bo

doi:10.1016/j.polymer.2019.03.064

Cited by 16 publications

(7 citation statements)

References 48 publications

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“…It indicates that mixed polymer brushes with stiffer polymer R will take longer time to complete the height-switching process. The conclusion is consistent with our previous results on the adsorption time of semi-flexible polymer chains, where the adsorption time of a polymer increases with the bending rigidity …”

Section: Resultssupporting

confidence: 93%

“…The conclusion is consistent with our previous results on the adsorption time of semi-flexible polymer chains, where the adsorption time of a polymer increases with the bending rigidity. 48 The effect of grafting density f on the height-switching time τ hs is also studied. Figure 5 shows the dependence of τ hs on f. τ hs increases monotonically with increasing f. Analogous to the relationship between the height-switching transition points ε PS c and f, 36 we believe that there is also a vertical asymptote between τ hs and f, which is named as a limit grafting density f limit .…”

Section: Height-switching Case Of Sudden Change In ε Psmentioning

confidence: 99%

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Height-Switching Dynamics of Mixed Polymer Brushes with Polymers of Different Stiffnesses

Yang

et al. 2023

Langmuir

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Mixed brushes consisting of flexible and semiflexible polymers of the same chain length exhibit a height-switching phenomenon because of rigidity-dependent critical adsorption [Yang et al. Macromolecules 2020, 53, 7369]. Semiflexible polymers stand higher at weak surface attraction (high temperature), but they close to the attractive surface at strong attraction (low temperature). In this work, the height-switching dynamics of the mixed polymer brushes is studied by Metropolis Monte Carlo simulation. The height-switching time is calculated by a sudden change in the surface attraction. Two surface attraction change modes, i.e., the weak-to-strong mode where the attraction is changed from weak to strong and the strong-to-weak mode where it is changed from strong to weak, are investigated. Simulation results show that the height-switching time is related to the grafting density, the polymer stiffness, and surface attraction change mode. We find that the height-switching time is significantly decreased for the strong-to-weak mode. And our results also show that the height switching in the mixed polymer brushes is reversible.

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Section: Resultssupporting

confidence: 93%

Section: Height-switching Case Of Sudden Change In ε Psmentioning

confidence: 99%

Height-Switching Dynamics of Mixed Polymer Brushes with Polymers of Different Stiffnesses

Yang

et al. 2023

Langmuir

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“…The attractive surface at z = 0 is assumed as a thick surface consisting of beads of a size σ . The polymer–surface interaction is described by the following integrated Lennard-Jones (LJ) potential: where ρ s is the surface density, ε PS is the LJ interaction strength, z is the distance between the monomer unit and the surface, and U 0 is used to shift the value of the LJ potential to 0 at z = z c . In simulations, the surface density ρ s = 1 and the cut-off distance z c = 2.5 are used.…”

Section: Model and Methodsmentioning

confidence: 99%

Height Switching in Mixed Polymer Brushes with Polymers of Different Stiffnesses

et al. 2020

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The conformational properties of mixed polymer brushes made of polymers with different stiffnesses are studied by using Monte Carlo computer simulations and the Scheutjens− Fleer self-consistent field approach. We find a height-switching phenomenon for the mixed brushes consisting of flexible and semiflexible polymers of the same chain length. The semi-flexible polymers are located above the flexible ones at weak surface attraction, whereas the flexible polymers are located above the semi-flexible ones at strong surface attraction due to the adsorption of the semi-flexible polymers. The height-switching transition point depends on the grafting density, the rigidity of the stiff polymer, and the polymer chain length. Our results indicate that it is possible to control the surface property by mixed polymer brushes.

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“…Adsorption/desorption is a ubiquitous phenomenon affecting the properties of interfaces. For the traditional polymer, experimental and theoretical studies − have been devoted to exploring the desorption affected by the adsorption strength, − surface roughness, − and crowding environment. , For instance, Luo et al . found that the interplay of the external driving force and thermal noise results in an adsorption–desorption transition.…”

Section: Introductionmentioning

confidence: 99%

Desorption of a Flexible Polymer with Activity from a Homogeneous Attractive Surface

Feng

Tian

2023

Macromolecules

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The interfacial behavior of a flexible polymer with activity, which is named active Brownian polymer (ABPO), is studied by Langevin dynamics simulations. On the dependence of the adsorption strength and activity characterized by the Pećlet number (Pe), the polymer displays two typical states on the surface: adsorption and desorption states. We find that the diffusion behavior of ABPO that is parallel to the surface yields the "active Rouse model" and the activity causes the adsorption− desorption transition at a certain adsorption strength. Particular attention is given to how the desorption time, τ des , changes with the activity. At intermediate activity, τ des displays an exponential decay with the inverse of the effective temperature, T eff ∝1 + Pe 2 /18, which is reminiscent of the mechanism of thermal activation. At higher activity, due to easily overcoming the attractive energy barrier, τ des ∝Pe −1 is found. At lower activity, a power-law dependence of τ des on the diffusion coefficient perpendicular to the surface (D ⊥ ) is observed (τ des ∼D ⊥ −1.28 ). Further, we observed a non-monotonic dependence of desorption time on the rotation diffusion coefficient D R of the monomer and found that τ des exists on a scaling relation with the chain length N, τ des ∼ N ϕ , and the scaling exponent ϕ decreases with the increase of activity. Our results highlight that the activity can be used to regulate the polymer adsorption and desorption behavior.

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Study on the adsorption process of a semi-flexible polymer onto homogeneous attractive surfaces

Cited by 16 publications

References 48 publications

Height-Switching Dynamics of Mixed Polymer Brushes with Polymers of Different Stiffnesses

Height-Switching Dynamics of Mixed Polymer Brushes with Polymers of Different Stiffnesses

Height Switching in Mixed Polymer Brushes with Polymers of Different Stiffnesses

Desorption of a Flexible Polymer with Activity from a Homogeneous Attractive Surface

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