Particle Morphology Dependent Superhydrophobicity In Treated Diatomaceous Earth/Polystyrene Coatings

Keywords

Contact angle; Diatomaceous earth polystyrene; Fluorosilane coupling agent; Scanning electron microscopy; Superhydrophobic surface

Abstract

Superhydrophobic surfaces have been prepared from three different types of diatomaceous earth (DE) particles treated with 3-(heptafluoroisopropoxy)propyltrimethoxysilane (HFIP-TMS) and low molecular mass polystyrene. The untreated particles, consisting of CelTix DE (disk shape), DiaFil DE (rod shape) and EcoFlat DE (irregular), were studied using particle size analysis, bulk density, pore volume and surface area analysis (via Brunauer–Emmett–Teller, BET, methods). The treated particles were characterized with thermogravimetric analysis (TGA), contact angles, scanning electron microscopy, profilometry, and FTIR spectroscopy. The minimum amount of silane coupling agent on the DE surfaces required to obtain superhydrophobicity of the particles was determined and found to be dependent on the particle morphology. In the coatings made from different particles with 2.4 wt% HFIP-TMS, the minimum amounts of treated particles (loadings) for superhydrophobicity was determined with the less dense CelTix DE requiring about 30 wt%, DiaFil DE requiring about 40 wt%, and EcoFlat DE each requiring about 60 wt% loading of treated particles.

Publication Date

9-15-2017

Publication Title

Applied Surface Science

Volume

416

Number of Pages

947-956

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.apsusc.2017.04.207

Socpus ID

85019022628 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85019022628

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