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Molecular basis for solvent dependent morphologies observed on electrosprayed surfaces.

Elif Ozden-Yenigun¹, Eren Simsek, Yusuf Ziya Menceloglu

¹Sabancı University, Faculty of Engineering and Natural Sciences, Material Science and Engineering Program, Istanbul, Turkey. canan@sabanciuniv.edu.

Physical Chemistry Chemical Physics : PCCP

|September 24, 2013

Summary

This summary is machine-generated.

We investigated tunable hydrophobicity in electrosprayed polymer beads. Solvent choice influences morphology, leading to superhydrophobic surfaces due to microphase separation and controlled drying dynamics.

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Area of Science:

Materials Science
Polymer Chemistry
Surface Science
Computational Chemistry

Background:

Tunable hydrophobicity is crucial for advanced material applications.
Electrospraying offers a method to create complex surface morphologies.
Understanding solvent effects on polymer behavior is key to controlling electrosprayed structures.

Purpose of the Study:

To elucidate the causes of tunable hydrophobicity in electrosprayed poly(styrene-co-perfluoroalkyl ethylacrylate).
To correlate solvent properties with the resulting surface morphology and superhydrophobicity.
To investigate the role of solvent-polymer interactions and drying phenomena in achieving dual-scale roughness.

Main Methods:

Atomistic and coarse-grained molecular dynamics simulations.
Dissipative particle dynamics (DPD) simulations for mesoscopic morphologies.
Dynamic light scattering (DLS) experiments to measure polymer chain size distributions.

Main Results:

DLS and simulations confirmed differing polymer chain size distributions in THF, DMF, and THF:DMF solvents.
DPD simulations revealed microphase separation in binary mixtures, favoring THF, leading to dual-scale roughness.
Drying phenomena were described in three stages, influenced by solvent diffusion and mass transfer coefficients.

Conclusions:

The preference of the polymer for THF in a binary mixture drives microphase separation and dual-scale roughness.
Controlled drying dynamics, governed by solvent properties, are essential for creating superhydrophobic surfaces.
The study provides a mechanistic understanding of how solvent selection impacts electrosprayed polymer morphology and hydrophobicity.