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Related Experiment Video

Updated: May 11, 2026

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices

Published on: March 27, 2019

Quantification of surface charge density and its effect on boundary slip.

Dalei Jing¹, Bharat Bhushan

¹Nanoprobe Laboratory for Bio- and Nanotechnology and Biomimetics (NLB2), The Ohio State University, Columbus, Ohio 43210-1142, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|May 21, 2013

Summary

Surface charge influences fluid drag in microfluidics. This study quantifies surface charge and slip length, finding higher surface charge density reduces boundary slip on octadecyltrichlorosilane (OTS) surfaces.

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Area of Science:

Physical Chemistry
Surface Science
Microfluidics

Background:

Fluid drag reduction is critical for micro-/nanofluidic systems.
Surface charge and boundary slip are known to influence fluid drag.
The relationship between surface charge and boundary slip requires further investigation.

Purpose of the Study:

To quantify surface charge density and boundary slip length at solid-liquid interfaces.
To investigate the effect of pH and electric fields on surface charge.
To analyze the impact of surface charge on slip length for octadecyltrichlorosilane (OTS) surfaces.

Main Methods:

Atomic Force Microscopy (AFM) was used to collect electrostatic force data.
A theoretical model was employed to fit AFM data and quantify surface charge density.
Slip length measurements were performed on OTS surfaces under varying conditions.

Main Results:

Surface charge density of borosilicate glass and OTS surfaces is affected by pH and electric fields.
A correlation was established between surface charge density and slip length.
Increased absolute surface charge density on OTS surfaces resulted in decreased slip length.

Conclusions:

pH and electric fields modulate surface charge density at solid-liquid interfaces.
Surface charge significantly impacts boundary slip, with higher charge leading to reduced slip.
Understanding this relationship is crucial for controlling fluid behavior in microfluidic applications.