DOI: 10.5281/zenodo.16054027
title: Dataset of the manuscript: A supraparticle-based approach to robust biomimetic superhydrophobic coatings

description: This data publication is based on the metadata and datasets underlying the manuscript:

A supraparticle-based approach to robust biomimetic superhydrophobic coatings  

Abstract:

Repellent surfaces provide resistance to biofouling, ice formation, bacteria adhesion, or corrosion. Inspired by the hierarchical structure of the lotus leaf, such surfaces minimize water adhesion through micro- and nanostructuring. Conventional fabrication methods to mimic the lotus leaf often involve problematic fluorinated compounds, sophisticated preparation conditions or lack mechanical robustness. Here, we present a fluorine-free, scalable approach for fabricating durable superhydrophobic coatings using supraparticles. Supraparticles are structured aggregates of colloidal primary particles and serve as intermediate building blocks that provide hierarchical surface roughness. We fabricate these supraparticles by spray drying and introduce hydrophobic surface properties via alkyl-silanes. These preassembled structures are then simply spray coated onto a polymeric primer layer to create a coating with hierarchical roughness features, mimicking the surface of the lotus leaf. We assess the performance of the coatings by water contact angles, contact angle hystereses, roll-off angles, and water droplet pinning fraction and show how the robustness can be enhanced by the addition of binder and choice of primer layer. Our method offers an experimentally simple, scalable and versatile process strategy for robust superhydrophobic coatings.

The data is organized according to the figures presented in the manuscript.

Folder '"Figure 1" contains:



Photograph of lotus leaf with water droplets.

High and low magnification SEM images of the lotus leaf.


Folder "Figure 2" contains:



High and low magnification SEM images of the supraparticle (SP).

SP size distribution

ChemDraw vector file of the octyl-trichlorosilane molecule.

Video of a droplet of water being pushed onto a bed of SPs.


Folder '"Figure 3" contains:



Top-view SEM images of the SP-based superhydrophobic coating.

High and low magnification side-view SEM images of the SP-based superhydrophobic coating.

Time-lapsed photographs of a dyed droplet of water rolling off the fabricated repellent coating.

Contact angle, hysteresis, and roll-off angle data for the SP-based superhydrophobic coating fabricated using spray coating.


Folder '"Figure 4" contains:



High and low magnification top-view SEM images of the superhydrophobic coating fabricated using sieved and unsieved SPs and a polydimethylsiloxane (PDMS) primer layer.

Particle size distribution of sieved and unsieved SPs.

Contact angle data for the bare PDMS primer layer.

Contact angle, hysteresis, roll-off angle and pinning fraction data for the superhydrophobic coatings fabricated using unsieved and sieved SPs, and a PDMS primer layer.


Folder "Figure 5" contains:



Contact angle, hysteresis, roll-off angle, and pinning fraction data for the superhydrophobic coatings fabricated using unsintered and sintered SPs, and a PDMS primer layer, subjected to multiple cycles of the tape test and abrasion test.

SEM image of coating made from unsintered SPs and a PDMS primer layer, after one cycle of tape peel test.

SEM image of coating made from SPs sintered at 900 °C and a PDMS primer layer, after five cycles of tape peel test.


Folder "Figure 6" contains:



Contact angle, hysteresis, roll-off angle, and pinning fraction data for the superhydrophobic coatings fabricated using unsintered and sintered SPs, and a polyurethane (PUR) primer layer, subjected to multiple cycles of the tape test and abrasion test.

High and low magnification SEM images of coating made from SPs sintered at 900 °C and PUR primer layer, after 15 cycles of abrasion test.

High and low magnification SEM images of coating made from binder-containing SPs and PUR primer layer, after 25 cycles of tape test.


Folder '"Supplementary Figure S1" contains:



SEM image of silica primary particles.

Particle size distribution of silica primary particles.


Folder "Supplementary Figure S2" contains:



High and low magnification SEM images of the SPs.


Folder '"Supplementary Figure S3" contains:



SEM images of the SP-based superhydrophobic coatings fabricated using one, two, and three cycles of spray coating.


Folder '"Supplementary Figure S4" contains:



Top-view SEM image of the SP-based superhydrophobic coating fabricated using dip coating method.

Contact angle, hysteresis, and roll-off angle data for the SP-based superhydrophobic coating fabricated using dip coating method.


Folder "Supplementary Figure S6" contains:



Contact angle data for the superhydrophobic coatings fabricated using unsintered and sintered SPs, and a PDMS primer layer, subjected to multiple cycles of the tape test and abrasion test.


Folder "Supplementary Figure S7" contains:



High and low magnification top-view SEM images of the superhydrophobic coating fabricated using sieved and unsieved SPs and a PUR primer layer.

Contact angle data for the bare PUR primer layer.

Contact angle, hysteresis, roll-off angle and pinning fraction data for the superhydrophobic coatings fabricated using unsieved and sieved SPs and a PUR primer layer.


Folder "Supplementary Figure S8" contains:



High and low magnification SEM images of the binder-containing SPs.

Particle size distribution of binder-containing SPs.


Folder "Supplementary Figure S9" contains:



Contact angle data for the superhydrophobic coatings fabricated using unsintered and sintered SPs, and a PUR primer layer, subjected to multiple cycles of the tape test and abrasion test.


Folder "Supplementary Figure S10" contains:



Contact angle, hysteresis, roll-off angle and pinning fraction data for the superhydrophobic coatings fabricated using binder-containing SPs, and a PUR primer layer, exposed to liquids with pH 1 and pH 14, and water.