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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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Enhanced fluid flow through nanopores by polymer brushes.

¹Department of Chemistry, The Chinese University of Hong Kong , Shatin, N.T. Hong Kong.

Langmuir : the ACS Journal of Surfaces and Colloids

|June 24, 2014

Summary

Adsorbing polystyrene-b-polyisoprene (PS-b-PI) copolymers to nanopore walls significantly reduces organic solvent friction. This polymer adsorption dramatically increases apparent slip length in nanofluidic transport.

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Area of Science:

Nanoscale science
Polymer physics
Fluid dynamics

Background:

Nanoscale transport is complex and a focus of extensive research.
Understanding friction at the nanoscale is crucial for developing advanced materials and devices.

Purpose of the Study:

To investigate the effect of polystyrene-b-polyisoprene (PS-b-PI) diblock copolymer adsorption on organic solvent friction in nanopore channels.
To quantify the change in apparent slip length due to polymer adsorption.

Main Methods:

Utilized 20 nm nanopore membranes made of aluminum oxide.
Studied the flow of tetrahydrofuran (THF) through bare and polymer-adsorbed nanopores.
Measured apparent slip length at various liquid flow shear rates.

Main Results:

Adsorption of PS-b-PI to the nanopore wall significantly reduced solvent friction.
Apparent slip length for THF increased from 0.13-0.16 μm (bare) to 3-13 μm (polymer-adsorbed).
Slip length became shear rate-dependent after polymer adsorption, unlike bare nanopores.

Conclusions:

Polymer chain stretching dynamics under shear flow explain the observed slip length behavior.
Findings offer insights into nanofluidics and potential biolubrication mechanisms.
Surface modification with block copolymers can effectively control friction in nanopores.