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Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

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Interfacial Inversion of Stealth Surfactants.

Hong-Gyu Seong¹, Pan Sun², Jan-Michael Y Carrillo³

¹Polymer Science & Engineering Department, Conte Center for Polymer Research, University of Massachusetts, Amherst, Massachusetts 01003, United States.

Journal of the American Chemical Society

|April 24, 2026

Summary

This summary is machine-generated.

Core-shell bottlebrush polymers act as pH-responsive stealth surfactants. These polymers undergo structural inversion at liquid-liquid interfaces, altering their configuration to reduce interfacial tension and free energy.

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Area of Science:

Polymer Science
Surface Chemistry
Materials Science

Background:

Amphiphilic macromolecular surfactants reduce interfacial tension by adsorbing at liquid-liquid interfaces.
Core-shell bottlebrush polymers with pH-responsive diblock copolymer side chains offer tunable solubility and interfacial behavior.

Purpose of the Study:

To investigate the interfacial behavior and surfactant properties of pH-responsive core-shell bottlebrush polymers.
To understand the structural inversion mechanism and its influence on interfacial tension.
To explore the design of advanced polymeric surfactants and compatibilizers.

Main Methods:

Synthesis and characterization of core-shell bottlebrush polymers.
Interfacial tension measurements over time.
Sum-frequency generation vibrational spectroscopy (SFG-VS) for interfacial configuration analysis.
Coarse-grained molecular dynamics (CGMD) simulations.

Main Results:

Polymers exhibit a structural inversion at liquid-liquid interfaces, with hydrophilic cores moving to the aqueous phase and hydrophobic shells to the oil phase.
Interfacial tension shows a nonmonotonic dependence on time, attributed to progressive structural inversion.
SFG-VS confirmed pH-dependent configurational changes and interfacial coverage.
CGMD simulations supported experimental findings, revealing time-averaged orientations of polymer components.

Conclusions:

pH-responsive core-shell bottlebrush polymers function as effective "stealth surfactants" through a pH-induced structural inversion.
The study elucidates the kinetics and thermodynamics of this interfacial reconfiguration.
Findings enable the design of stimuli-responsive polymeric surfactants for diverse applications.