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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

Published on: September 7, 2018

Modulation of electroosmotic flow by neutral polymers.

Rui Qiao¹, Ping He

¹Department of Mechanical Engineering, Clemson University, Clemson, South Carolina 29634, USA. rqiao@ces.clemson.edu

Langmuir : the ACS Journal of Surfaces and Colloids

|April 17, 2007

Summary

Neutral polymers modulate electroosmotic flow (EOF) in microfluidics. Increasing electric fields nonlinearly decrease polymer screening of EOF, offering insights for flow control applications.

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Area of Science:

Fluid dynamics
Polymer science
Surface chemistry

Background:

Polymer coatings are essential for controlling fluid flow in micro- and nanofluidic systems.
Electroosmotic flow (EOF) is particularly sensitive to surface properties and polymer interactions.

Purpose of the Study:

To investigate how neutral polymers modulate electroosmotic flow using dissipative particle dynamics simulations.
To understand the relationship between polymer conformation, fluid flow, and external electric fields.

Main Methods:

Utilized coarse-grained dissipative particle dynamics (DPD) simulations.
Explicitly modeled the two-way coupling between polymer conformation and fluid flow.
Resolved fluid and polymers at a scale comparable to polymer size.

Main Results:

Observed a nonlinear decrease in EOF screening by polymers as the external electric field strength increased.
Analyzed polymer surface coverage, grafted polymer height, and orientation.
Identified two distinct modes of flow screening dependent on the electric field.

Conclusions:

The study provides a mechanistic understanding of polymer-induced EOF modulation.
Findings are crucial for the rational design of polymer coatings for precise flow control in microfluidics and nanofluidics.