AUB ScholarWorks

Browsing Department of Physics by Author "Klushin, Leonid I."

Browsing Department of Physics by Author "Klushin, Leonid I."

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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, ...
  • Adsorption-active polydisperse brush with tunable molecular mass distribution 
    Ivanova, Anna S.; Polotsky, Alexey A.; Skvortsov, Aleksander M.; Klushin, Leonid I.; Schmid, Friederike (American Institute of Physics Inc., 2022)
    Recently, a novel class of responsive uncharged polymer brushes has been proposed [Klushin et al., J. Chem. Phys. 154(7), 074904 (2021)] where the brush-forming chains have an affinity to the substrate. For sufficiently ...
  • 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 ...
  • Arm retraction dynamics and bistability of a three-arm star polymer in a nanopore 
    Milchev, Andrey I.; Müller, Marcus; Klushin, Leonid I. (American Chemical Society, 2014)
    Using molecular dynamics and Monte Carlo simulations as well as analytical considerations, we study the arm-retraction dynamics of a three-arm star polymer in a narrow nanotube as a function of arm length, N, and tube ...
  • Coil-bridge transition in a single polymer chain as an unconventional phase transition: Theory and simulation 
    Klushin, Leonid I.; Skvortsov, Aleksander M.; Polotsky, Alexey A.; Hsu, Hsiaoping; Binder, Kurt (American Institute of Physics Inc., 2014)
    The coil-bridge transition in a self-avoiding lattice chain with one end fixed at height H above the attractive planar surface is investigated by theory and Monte Carlo simulation. We focus on the details of the first-order ...
  • Compression and interpenetration of adsorption-active brushes 
    Ivanova, Anna S.; Polotsky, Alexey A.; Skvortsov, Aleksander M.; Klushin, Leonid I.; Schmid, Friederike (American Institute of Physics Inc., 2023)
    Compression and interpenetration of two opposing polymer brushes formed by end-grafted adsorption-active chains are studied by the numerical self-consistent field approach and by analytical theory. For sufficiently strong ...
  • Force-extension curves for broken-rod macromolecules: Dramatic effects of different probing methods for two and three rods 
    Alexeev, A. V.; Maltseva, Diana V.; Ivanov, Viktor A.; Klushin, Leonid I.; Skvortsov, Aleksander M. (American Institute of Physics Inc., 2015)
    We study force-extension curves of a single semiflexible chain consisting of several rigid rods connected by flexible spacers. The atomic force microscopy and laser optical or magnetic tweezers apparatus stretching these ...
  • Interpenetration and Friction of Brush-Coated Surfaces under External Load: Analytical Theory and SCF Calculations 
    Klushin, Leonid I.; Ivanova, Anna S.; Polotsky, Alexey A.; Skvortsov, Aleksander M. (American Chemical Society, 2023)
    We studied the compression and interpenetration properties of two opposing monodisperse polymer brushes under external load by analytical theory and by a numerical self-consistent field (SCF) approach. Analytical expressions ...
  • 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 ...
  • Polymer brushes with reversibly tunable grafting density 
    Klushin, Leonid I.; Skvortsov, Aleksander M.; Polotsky, Alexey A.; Ivanova, Anna S.; Schmid, Friederike (American Institute of Physics Inc., 2021)
    We propose a novel class of responsive polymer brushes, where the effective grafting density can be controlled by external stimuli. This is achieved by using end-grafted polymer chains that have an affinity to the substrate. ...
  • Selective Colloid Transport across Planar Polymer Brushes 
    Laktionov, Mikhail Y.; Zhulina, Ekaterina B.; Klushin, Leonid I.; Richter, Ralf P.; Borisov, Oleg V. (John Wiley and Sons Inc, 2023)
    Polymer brushes are attractive as surface coatings for a wide range of applications, from fundamental research to everyday life, and also play important roles in biological systems. How colloids (e.g., functional nanoparticles, ...
  • 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 ...
  • Steady and transient states in low-energy swarms: Stability and first-passage times 
    Al-Sayegh, Amara A.; Klushin, Leonid I.; Touma, Jihad R. (American Physical Society, 2016)
    We investigate a class of agent-based models of self-propelled particles (SPP) that interact according to a Morse potential in the presence of friction, a class which was able to reproduce many of the intriguing patterns ...
  • 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 ...
  • Transport properties of thermoplastic R-BAPB polyimide: Molecular dynamics simulations and experiment 
    Volgin, Igor V.; Andreeva, Maria V.; Larin, Sergey V.; Didenko, Andrey L.; Vaganov, Gleb V.; Borisov, Il'ya L.; Volkov, Alexey Vladimirovich; Klushin, Leonid I.; Lyulin, Sergey V. (MDPI AG, 2019)
    Thepresentwork evaluates the transportproperties of thermoplasticR-BAPBpolyimide based on 1,3-bis(3,30,4,40-dicarboxyphenoxy)benzene (dianhydride R) and 4,40-bis(4-aminophenoxy)biphenyl (diamine BAPB). Both experimental ...
  • 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 ...
  • Unexpected stray attractors in confined leader-follower dynamics driven by cone-of-vision interactions 
    Al-Sayegh, Amara A.; Najem, Sara A.; Klushin, Leonid I.; Touma, Jihad R. (Nature Publishing Group, 2019)
    Experiments with groups of fish inside a circular tank have provided valuable insights into the nature of leadership in social groups. Sophisticated mathematical models were constructed with a view to recovering observed ...

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