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A Filter-based Surface Enhanced Raman Spectroscopic Assay for Rapid Detection of Chemical Contaminants

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Published on: February 19, 2016

A liquid drop RC filter apparatus for detection.

Yasith S Nanayakkara¹, Daniel W Armstrong

¹Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019, USA.

Analytical and Bioanalytical Chemistry

|October 1, 2011

Summary

This summary is machine-generated.

A novel liquid drop resistor-capacitor (RC) filter detector analyzes compounds using gain vs. frequency curves. This device detects diverse species in liquids and integrates with microfluidic systems.

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Area of Science:

Analytical Chemistry
Physical Chemistry
Materials Science

Background:

Traditional analytical methods often require complex sample preparation.
Developing portable and versatile analytical detectors is crucial for various applications.
Electrowetting on dielectric (EWOD) systems offer unique platforms for fluid manipulation and sensing.

Purpose of the Study:

To introduce a new analytical detector based on a liquid drop resistor-capacitor (RC) filter.
To demonstrate the detector's capability in analyzing various chemical species dissolved in liquids.
To explore the integration of this detector with microfluidic systems.

Main Methods:

Fabrication of the detector by modifying an electrowetting on dielectric (EWOD) experimental setup.
Utilizing a liquid drop on a dielectric surface as an RC filter.
Analyzing transformed gain vs. frequency curves to characterize different solutions.
Testing the detector with various solutions including zinc chloride, benzalkonium chloride, 1-methylimidazole, and cetyltrimethyl-ammonium chloride (CTAC) in water and ethylene glycol.

Main Results:

The liquid drop acts as a RC filter, with gain being a function of liquid properties and applied voltage.
Each liquid/solution exhibits a unique gain vs. frequency curve, enabling compound identification.
Successful detection of various compounds dissolved in different solvents was achieved.
The detector demonstrated potential for both stand-alone use and integration with microfluidic platforms.

Conclusions:

The developed liquid drop RC filter detector offers a novel approach for analyzing dissolved species.
The device's sensitivity to physical properties like conductivity and dielectric constant allows for differentiation of compounds.
This technology holds promise for versatile, lab-on-a-chip analytical applications.