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Atomic Force Microscopy

Atomic Force Microscopy

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The AFM Probe
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Updated: Jun 1, 2026

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

Nanoscale electrowetting effects observed by using friction force microscopy.

Reynier Revilla¹, Li Guan, Xiao-Yang Zhu

¹Key Laboratory of Standardization and Measurement for Nanotechnology, the Chinese Academy of Sciences, National Center for Nanoscience and Technology, Beijing 100190, China.

Langmuir : the ACS Journal of Surfaces and Colloids

|May 25, 2011

Summary

We used friction force microscopy to study electrowetting on poly(methyl methacrylate) surfaces. Strong electric fields reduced friction and revealed electrowetting saturation, impacting nanoscale capillary phenomena.

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Area of Science:

Surface science
Nanotechnology
Tribology

Background:

Electrowetting (EW) phenomena are crucial for microfluidic devices and tunable optics.
Understanding EW at the nanoscale is essential for precise control of interfacial properties.
Poly(methyl methacrylate) (PMMA) is a common polymer with applications in various fields.

Purpose of the Study:

To investigate electrowetting effects on a poly(methyl methacrylate) (PMMA) surface under strong electric fields.
To explore the relationship between friction force and electrowetting at the nanoscale.
To identify the ideal EW region and EW saturation using friction force microscopy.

Main Methods:

Utilizing friction force microscopy (FFM) with a conductive atomic force microscopy (AFM) tip.
Measuring friction force dependence on applied electric field strength on a PMMA surface.
Analyzing nanoscale capillary phenomena influencing frictional behavior.

Main Results:

Friction force dependence on electric field was closely related to electrowetting processes.
The ideal EW region, described by the Young-Lippmann equation, and EW saturation were identified.
A reduction in the friction coefficient was observed with increasing electric field in the ideal EW region.
Changes in interfacial contact correlated with the transition from ideal EW to EW saturation.

Conclusions:

Friction force microscopy is a viable technique for studying nanoscale electrowetting.
The study provides insights into the interplay between electric fields, capillary forces, and friction on polymer surfaces.
Results demonstrate the influence of electric fields on interfacial contact and tribological properties of PMMA.