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Browsing Department of Physics by Author "Qi, Shuanhu"

Browsing Department of Physics by Author "Qi, Shuanhu"

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  • Adsorption Active Diblock Copolymers as Universal Agents for Unusual Barrier-Free Transitions in Stimuli-Responsive Brushes 
    Qi, Shuanhu; Klushin, Leonid I.; Skvortsov, Aleksander M.; Schmid, Friederike (American Chemical Society, 2021)
    We reconsider a recently proposed design for smart responsive brushes, which is based on a conformational transition in very dilutely embedded block copolymers with a surface active block (Qi et al., Macromolecules 53, ...
  • Anomalous critical slowdown at a first order phase transition in single polymer chains 
    Zhang, Shuangshuang; Qi, Shuanhu; Klushin, Leonid I.; Skvortsov, Aleksander M.; Yan, Dadong; Schmid, Friederike (American Institute of Physics Inc., 2017)
    Using Brownian dynamics, we study the dynamical behavior of a polymer grafted onto an adhesive surface close to the mechanically induced adsorption-stretching transition. Even though the transition is first order (in the ...
  • Phase transitions in single macromolecules: Loop-stretch transition versus loop adsorption transition in end-grafted polymer chains 
    Zhang, Shuangshuang; Qi, Shuanhu; Klushin, Leonid I.; Skvortsov, Aleksander M.; Yan, Dadong; Schmid, Friederike (American Institute of Physics Inc., 2018)
    We use Brownian dynamics simulations and analytical theory to compare two prominent types of single molecule transitions. One is the adsorption transition of a loop (a chain with two ends bound to an attractive substrate) ...
  • Polydisperse Brush with the Linear Density Profile 
    Klushin, Leonid I.; Skvortsov, Aleksander M.; Qi, Shuanhu; Schmid, Friederike (Pleiades Publishing, 2018)
    Macromolecules densely end-grafted to a planar solid surface form a polymer monolayer (brush). It is known that, in a good solvent, the density profile of monodisperse brushes parabolically decays on moving away from the ...
  • Polydisperse Polymer Brushes: Internal Structure, Critical Behavior, and Interaction with Flow 
    Qi, Shuanhu; Klushin, Leonid I.; Skvortsov, Aleksander M.; Schmid, Friederike (American Chemical Society, 2016)
    We study the effect of polydispersity on the structure of polymer brushes by analytical theory, a numerical self-consistent field approach, and Monte Carlo simulations. The polydispersity is represented by the Schulz-Zimm ...
  • Polydispersity Effects on Interpenetration in Compressed Brushes 
    Klushin, Leonid I.; Skvortsov, Aleksander M.; Qi, Shuanhu; Kreer, Torsten; Schmid, Friederike (American Chemical Society, 2019)
    We study the effect of polydispersity on the compression and interpenetration properties of two opposing polymer brushes by numerical self-consistent field approach and by analytical theory. Polydispersity is represented ...
  • Sharp and fast: Sensors and switches based on polymer brushes with adsorption-active minority chains 
    Klushin, Leonid I.; Skvortsov, Aleksander M.; Polotsky, Alexey A.; Qi, Shuanhu; Schmid, Friederike (American Physical Society, 2014)
    We propose a design for polymer-based sensors and switches with sharp switching transition and fast response time. The switching mechanism involves a radical change in the conformations of adsorption-active minority chains ...
  • Stimuli-Responsive Brushes with Active Minority Components: Monte Carlo Study and Analytical Theory 
    Qi, Shuanhu; Klushin, Leonid I.; Skvortsov, Aleksander M.; Polotsky, Alexey A.; Schmid, Friederike (American Chemical Society, 2015)
    Using a combination of analytical theory, Monte Carlo simulations, and three-dimensional self-consistent field calculations, we study the equilibrium properties and the switching behavior of adsorption-active polymer chains ...
  • Tuning Transition Properties of Stimuli-Responsive Brushes by Polydispersity 
    Qi, Shuanhu; Klushin, Leonid I.; Skvortsov, Aleksander M.; Liu, Mingjie; Zhou, Jiajia; Schmid, Friederike (Wiley-VCH Verlag, 2018)
    A new design for sensors and switches based on polymer brushes including a small fraction of end-grafted adsorption-active minority chains has been proposed recently. The switching transition is controlled by temperature ...
  • Using Copolymers to Design Tunable Stimuli-Reponsive Brushes 
    Qi, Shuanhu; Klushin, Leonid I.; Skvortsov, Aleksander M.; Schmid, Friederike (American Chemical Society, 2020)
    Recently, a new design for switch sensors has been proposed that exploits a conformational transition of end-grafted minority adsorption-active homopolymers in a monodisperse polymer brush [Klushin et al. Phys. Rev. Lett. ...

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