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Updated: Feb 27, 2026

A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction

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Published on: January 26, 2016

Microfluidic Surface Titrations of Electroactive Thin Films.

Morgan J Anderson¹, Richard M Crooks¹

¹Department of Chemistry, The University of Texas at Austin , 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|July 1, 2017

Summary

This summary is machine-generated.

Microfluidic surface titrations (MSTs) offer a sensitive method for quantifying electroactive thin films. This technique, using a dual channel electrode, can detect surface coverages at levels undetectable by direct electrochemical measurements.

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Area of Science:

Electrochemistry
Surface Science
Nanotechnology

Background:

Electroactive self-assembled monolayers (eSAMs) are crucial for applications in electronics and sensing.
Accurate quantification of surface coverage is essential for understanding and optimizing eSAM performance.
Existing electrochemical methods may underestimate the true concentration of electroactive species in eSAMs.

Purpose of the Study:

To introduce and validate microfluidic surface titrations (MSTs) as a novel technique for studying eSAMs and thin films.
To demonstrate the capability of MSTs in quantifying low surface coverages of electroactive materials.
To compare MST results with direct electrochemical measurements for eSAMs.

Main Methods:

Utilizing a microfluidic generation-collection dual channel electrode (DCE) configuration.
Performing microfluidic surface titrations to quantify charge associated with thin films.
Measuring surface coverages (Γ) of electrodeposited copper and ferrocene-terminated alkylthiols.

Main Results:

MSTs enable quantitative measurement of surface coverages as low as 30 pmol cm⁻² for Cu thin films.
The technique successfully quantifies surface coverage for ferrocene-terminated alkylthiols in mixed-monolayer eSAMs.
MSTs revealed up to a two-fold higher eSAM concentration than direct electrochemical methods.

Conclusions:

MSTs provide a powerful and sensitive tool for characterizing electroactive thin films and eSAMs.
The discrepancy between MST and direct electrochemical measurements suggests inaccessible electroactive moieties in some eSAMs.
This technique enhances the understanding of eSAM structure and interfacial properties.