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Related Experiment Video

Updated: Dec 9, 2025

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

Published on: December 24, 2014

Computer simulation of anisotropic polymer brushes.

Alla I Tupitsyna¹, Anatoly A Darinskii², Igor Emri³

¹Institute of Problems of Mechanical Engineering, Russian Academy of Sciences, St. Petersburg, Russia. atupitsyna@mail.ru and Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg, Russia.

|September 10, 2020

Summary

This summary is machine-generated.

A polymer brush undergoes a liquid-crystal transition when mixed with spherical particles. This transition, driven by sphere concentration, forms ordered structures within the brush, independent of grafting density.

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Sample Preparation in Quartz Crystal Microbalance Measurements of Protein Adsorption and Polymer Mechanics

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Published on: January 22, 2020

Area of Science:

Polymer Physics
Soft Matter Physics
Materials Science

Background:

Polymer brushes are versatile materials with applications in coatings, sensors, and nanotechnology.
Understanding the self-assembly and phase behavior of polymer brushes in complex fluids is crucial for designing advanced materials.

Purpose of the Study:

To investigate the liquid-crystal and oriented-domain transitions in polymer brushes composed of anisotropic monomers immersed in a liquid of spherical particles.
To determine the influence of sphere concentration and grafting density on the observed phase transitions and resulting structures.

Main Methods:

Molecular dynamics simulations were employed to model the behavior of the polymer brush and spherical particles.
The study examined both densely-grafted and sparsely-grafted polymer brushes.

Main Results:

A liquid-crystal or oriented-domain transition occurs in the polymer brush at a specific sphere concentration.
The transition point is largely independent of the grafting density.
In densely-grafted brushes, the transition proceeds through a microphase-segregated state with distinct ordered and disordered regions.
The ordered microphase, rich in monomers, is near the grafting surface, while the disordered, sphere-rich microphase is at the periphery.
Increasing sphere concentration leads to the expansion of the ordered microphase, eventually occupying the entire brush volume.
Ordered monomers form smectic structures at lower sphere concentrations and orientationally ordered domains at higher concentrations.

Conclusions:

The study reveals a concentration-driven liquid-crystal transition in polymer brushes with anisotropic monomers.
The formation of distinct microphases and ordered structures (smectic, domains) is dependent on sphere concentration.
Grafting density has a minimal impact on the transition point, suggesting a robust phenomenon driven by monomer-particle interactions.