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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

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Pore shape of honeycomb-patterned films: modulation and interfacial behavior.

Ling-Shu Wan¹, Bei-Bei Ke, Jing Zhang

¹MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, China. lswan@zju.edu.cn

The Journal of Physical Chemistry. B

|December 14, 2011

Summary

This study demonstrates tunable pore shapes in polystyrene films using different solvents and additives. Researchers found that controlling interfacial tension via additive aggregation is key to modulating pore morphology for various applications.

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Micropunching Lithography for Generating Micro- and Submicron-patterns on Polymer Substrates

Micropunching Lithography for Generating Micro- and Submicron-patterns on Polymer Substrates

Published on: July 2, 2012

Area of Science:

Materials Science
Polymer Science
Surface Science

Background:

Breath figures are commonly studied for pore size control, but pore shape modulation is often overlooked.
Pore shape is critical for applications like replica molding, filtration, particle assembly, and cell culture.

Purpose of the Study:

To investigate tunable pore shape control in patterned films.
To explore the influence of solvents and hydrophilic additives on pore morphology.
To understand the mechanism of pore shape formation in breath figures.

Main Methods:

Preparation of patterned polystyrene (PS) films using tetrahydrofuran (THF) and chloroform (CF) solvents.
Inclusion of hydrophilic additives: poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA), poly(ethylene glycol) (PEG), and poly(N-vinyl pyrrolidone) (PVP).
Observation and analysis of water droplet formation and interfacial tension measurements.

Main Results:

Pore shape transitioned from near-spherical to ellipsoidal with increasing additive concentration in CF.
THF solvent exclusively produced ellipsoidal pores.
Additive aggregation at the water/polymer interface, influenced by solvent choice, controlled interfacial tension and pore shape.

Conclusions:

Additive aggregation efficiency at the interface dictates pore shape modulation.
The findings offer insights into the breath figure process and a method for creating patterned films with controlled pore structures.