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Nanoparticle-Induced Interfacial Director Straining Enables Ultrasensitive Molecular Detection at Microfluidic Liquid
Pouriya Esmaeilzadeh1, Emre Bukusoglu1,2
1Department of Chemical Engineering, Middle East Technical University, Dumlupınar Bulvarı No.1, Çankaya, Ankara06800, Türkiye.
ACS Applied Materials & Interfaces
|July 16, 2026
Summary
New nanoparticle-decorated liquid crystal (LC) microfluidic sensors detect trace pollutants in water with high sensitivity. These advanced sensors offer a powerful tool for environmental monitoring and public health applications.
Area of Science:
- Materials Science
- Environmental Science
- Analytical Chemistry
Background:
- Detecting trace pollutants in aqueous environments is crucial for environmental and public health monitoring.
- Traditional methods often face limitations in sensitivity and specificity for detecting a wide range of contaminants.
Purpose of the Study:
- To develop and validate a novel microfluidic platform using nanoparticle-decorated liquid crystals (LCs) for sensitive detection of aqueous trace analytes.
- To investigate the sensor's performance, including limit of detection (LOD) and selectivity, for various environmental pollutants.
Main Methods:
- Utilized silica nanoparticles functionalized with alkyl-terminated silanes to decorate LC-aqueous interfaces, inducing LC strain.
- Employed microfluidic platforms and LC droplet-based sensors to optically observe LC ordering transitions in response to analytes.
- Investigated the impact of nanoparticle loading and interface geometry on sensor sensitivity and selectivity.
Main Results:
- Achieved a limit of detection (LOD) as low as 0.1 ppb for trace analytes using concentrated nanoparticle-decorated LC interfaces in microfluidics.
- Demonstrated a significant 4-orders-of-magnitude reduction in LOD by optimizing interfacial nanoparticle loading.
- Observed selectivity for analytes with aromatic structures, indicating potential for specific pollutant identification.
Conclusions:
- Nanoparticle-decorated LC microfluidic sensors offer a highly sensitive and selective platform for detecting aqueous trace pollutants.
- The developed sensor technology shows promise for real-time environmental monitoring, micropollutant tracking, and medical diagnostics.
