Surface properties of superhydrophobic coatings for stone protection

P. N. Manoudis, I. Karapanagiotis, A. Tsakalof, I. Zuburtikudis, B. Kolinkeová, C. Panayiotou

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Superhydrophobic films are produced by a simple and low cost method. Silica (SiO2) nanoparticles are dispersed in solutions of Rhodorsil 224, a commercial poly(alkyl siloxane) which is used for the protection of outdoor cultural heritage objects, and the suspensions are sprayed on glass surfaces. It is shown that the siloxane-nanoparticle composite films prepared from dispersions of high particle concentrations (≥ 0.5% w/v) exhibit superydrophobic properties (high static contact angle and small hysteresis) which can be rationalized by the Cassie-Baxter model, according to quantitative measurements obtained by SEM images. Siloxane-nanoparticle films are then deposited (sprayed) on "Opuka", a fine-grained argillite which was used for the restoration of the castle of Prague. It is shown that the treated stone surfaces exhibit superydrophobic properties, similar to the treated glass surfaces. The efficacy of the superhydrophobic films to protect Opuka is evaluated by performing water contact angle, water capillary absorption, water vapor permeability and colorimetric measurements. It is shown that the use of nanoparticles in the protective coating has a positive effect on the results of the aforementioned tests, except for the colorimetric measurements.

Original languageEnglish
Pages (from-to)23-33
Number of pages11
JournalJournal of Nano Research
Volume8
DOIs
Publication statusPublished - Sep 2 2009

Keywords

  • Cultural heritage
  • Monument protection
  • Nanoparticles
  • Siloxane
  • Superhydrophobicity

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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