Sustainable superhydrophobic and self-cleaning wood via wax within Epoxy/PDMS nano-composite coatings: Durability related to surface morphology

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41320%2F24%3A100570" target="_blank" >RIV/60460709:41320/24:100570 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/j.porgcoat.2023.107951" target="_blank" >http://dx.doi.org/10.1016/j.porgcoat.2023.107951</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.porgcoat.2023.107951" target="_blank" >10.1016/j.porgcoat.2023.107951</a>

Result language

angličtina

Original language name

Sustainable superhydrophobic and self-cleaning wood via wax within Epoxy/PDMS nano-composite coatings: Durability related to surface morphology

Original language description

The stability of wood materials in harsh environments requires a durable superhydrophobic (SH) coating. In this paper, a sustainable SH coating, suitable for interior and exterior applications of wood, was produced by reinforcing with bio based carnauba-wax two matrices, i.e. Epoxy resin or polydimethylsiloxane (PDMS). Fluorinefree dodecyl-terminated silica nanoparticles (DDT-SiO2), prepared through a chemical procedure, have been used to increase the hydrophobicity of all coating formulations. A novel approach for the wood substrate preparation was proposed and tested. The results showed that long-term water-repellency of the SH coatings can be enhanced by solvent/ultrasonic pre-treatments, controlling the chemical and morphological characteristics of the wood substrate before coating. The formulation containing wax exhibited a contact angle of 172 degrees and a sliding angle <3 degrees when applied on a clean/micro-structured wood surface subjected to solvent pre-treatments. The PDMSbased coating displayed excellent durability to water impact test, 120 cycles outdoor weathering/aging and severe environments (i.e. chemicals, ultrasonic and sea-water) than Epoxy one. While wax decreased the transparency of Epoxy-based coatings, the synergistic effect on the durability of the coating was evident. The superior characteristics of non-wetting, mechanically durable and resistance to finger-touch test of wax-PDMSDDT-SiO2 coating were attributed to the hierarchical structure caused by carnauba-wax self-assembly and interwoven morphology. In fact, the wax helps keep the PDMS-NPs lotus-like structures tightly connected, producing a robust surface. The self-cleaning test, carried out using commonly used liquids and colored water, confirmed the admirable performance of the PDMS-based coating, guaranteeing also aesthetic property. The surface treatment obtained can be considered eco-friendly as it is composed of vegetable carnauba-wax containing nanoparticles modified with non-fluorinated compounds.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

PROGRESS IN ORGANIC COATINGS

ISSN

0300-9440

e-ISSN

0300-9440

Volume of the periodical

186

Issue of the periodical within the volume

14.0

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

14

Pages from-to

1-14

UT code for WoS article

001300742100001

EID of the result in the Scopus database

2-s2.0-85173829973