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Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

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Carbohydrate-actuated nanofluidic diode: switchable current rectification in a nanopipette.

Boaz Vilozny¹, Alexander L Wollenberg, Paolo Actis

¹Department of Biomolecular Engineering, Baskin School of Engineering at University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA. pourmand@soe.ucsc.edu.

|August 13, 2013

Summary

Researchers developed a novel carbohydrate-responsive polymer system to control ion flow in nanofluidic devices. This breakthrough allows for reversible switching of ion conductance, paving the way for advanced sensors and drug delivery applications.

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Area of Science:

Biomimetic systems
Nanofluidics
Polymer science

Background:

Nanofluidic structures mimic biological ion channels, but controlling ion flow in artificial systems remains difficult.
Developing methods for precise molecular actuation of ion conductance is crucial for advanced applications.

Purpose of the Study:

To design and demonstrate a system for modulating ion conductance in nanofluidic devices using a carbohydrate-responsive polymer.
To investigate the reversible switching of current rectification based on monosaccharide concentration.

Main Methods:

Fabrication of a quartz nanopipette system incorporating a cationic polymer.
Utilizing a poly(vinylpyridine) derivative functionalized with benzylboronic acid groups.
Observing polymer conformational changes (swollen to collapsed) upon monosaccharide binding.

Main Results:

The carbohydrate-responsive polymer successfully modulated ion conductance within the nanopipette.
Reversible switching of current rectification was achieved by varying monosaccharide concentrations.
Demonstrated molecular actuation of nanofluidic conductance.

Conclusions:

The developed system offers a novel approach for controlling ion transport in nanofluidics.
This technology holds potential for creating advanced biosensors and targeted drug delivery systems.
Molecular actuation of nanofluidic conductance is feasible using responsive polymers.