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Updated: Jun 29, 2026

Dry Film Photoresist-based Electrochemical Microfluidic Biosensor Platform: Device Fabrication, On-chip Assay Preparation, and System Operation

Dry Film Photoresist-based Electrochemical Microfluidic Biosensor Platform: Device Fabrication, On-chip Assay Preparation, and System Operation

Published on: September 19, 2017

Electroosmotic flow-based pump for liquid chromatography on a planar microchip.

Joseph F Borowsky¹, Braden C Giordano, Qin Lu

¹Chemistry Division, Naval Research Laboratory, 4555 Overlook Avenue, SW, Code 6112, Washington, DC 20375-5342, USA.

Analytical Chemistry

|October 8, 2008

Summary

This study presents a novel microchip system for explosives detection using an electroosmotic flow (EOF) pump and sol-gel chromatography. The integrated device efficiently separates explosives and their byproducts, offering a portable analytical solution.

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Area of Science:

Analytical Chemistry
Microfluidics
Materials Science

Background:

Explosives detection remains critical for security and environmental monitoring.
Existing analytical methods often require bulky equipment and extensive sample preparation.
Microfluidic devices offer potential for miniaturized, portable analytical systems.

Purpose of the Study:

To develop an integrated electroosmotic flow (EOF) pump and liquid chromatography (LC) system on a single microchip.
To utilize a sol-gel stationary phase for the separation of nitroaromatic and nitramine explosives and their degradation products.
To demonstrate a portable, lab-on-chip analytical platform for explosives analysis.

Main Methods:

Fabrication of an integrated EOF pump and LC system within a quartz substrate.
Packing the pump channel with porous silica beads.
Synthesizing a sol-gel stationary phase monolith in the electric field-free region.
Characterizing pump and separation performance, including flow rate, injection, elution, separation, and detection.

Main Results:

Successful integration of an EOF pump with an LC system on a single microchip.
Efficient separation of six nitroaromatic and nitramine explosives and their degradation products.
Demonstrated viability of the sol-gel stationary phase for explosives analysis.
Achieved performance metrics indicating a functional analytical chemistry platform.

Conclusions:

The developed microchip system provides a viable analytical chemistry platform for explosives detection.
The integrated EOF pump and sol-gel LC system offer benefits of portability, reduced sample requirements, and small packaging.
This lab-on-chip approach shows promise for field-deployable explosives analysis.