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Multiscale Structures Aggregated by Imprinted Nanofibers for Functional Surfaces

Multiscale Structures Aggregated by Imprinted Nanofibers for Functional Surfaces

Published on: September 11, 2018

Filled nanoporous surfaces: controlled formation and wettability.

Eyal Bittoun¹, Abraham Marmur, Mattias Ostblom

¹Department of Chemical Engineering, Technion- Israel Institute of Technology, 32000 Haifa, Israel.

Langmuir : the ACS Journal of Surfaces and Colloids

|August 25, 2009

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Researchers controlled the filling of nanoporous surfaces with hydrophilic molecules using thiocholesterol (TC) and mercaptoundecanoic acid (MUA). This method precisely tunes surface wetting properties at the nanoscale.

Area of Science:

Surface Science
Nanotechnology
Physical Chemistry

Background:

Hydrophobic surfaces with nanopores present challenges for controlled molecular filling.
Understanding wetting properties of such surfaces is crucial for various applications.
Self-assembled monolayers (SAMs) offer a platform for creating well-defined nanoporous structures.

Purpose of the Study:

To demonstrate controlled filling of hydrophobic nanoporous surfaces with hydrophilic molecules.
To investigate the wetting properties of these modified surfaces.
To develop a novel procedure for nanopore filling using thiocholesterol (TC) and mercaptoundecanoic acid (MUA).

Main Methods:

Fabrication of thiocholesterol (TC) self-assembled monolayers (SAMs) on gold substrates.

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A novel immersion procedure using a TC and MUA "cocktail" solution for nanopore filling.

Contact angle measurements (stable contact angle and contact angle hysteresis) to characterize wetting properties.

Main Results:

A procedure was developed to fill nanopores in TC SAMs with MUA, achieving up to 23% area fraction coverage.
The filling process resulted in a homogeneously mixed SAM, not a phase-segregated overlayer.
The most stable contact angle was well-described by the Cassie equation.
Contact angle hysteresis proved sensitive to nanoscale chemical heterogeneity.

Conclusions:

Controlled nanopore filling with hydrophilic molecules can be achieved using a specific immersion technique.
The developed method allows for tuning surface wetting properties at the nanoscale.
Contact angle hysteresis is a sensitive indicator of surface chemical heterogeneity at the nanometric scale.