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Superhydrophobic to superhydrophilic wettability transition of functionalized SiO2 nanoparticles

Journal Article · · Ceramics International
 [1];  [1];  [1];  [1];  [1];  [2]
  1. Inst. Politecnico Nacional (IPN), Ramos Arizpe, Coahuila (Mexico). Centro de Investigacion y de Estudios Avanzados (CINVESTAV)
  2. Inst. Politecnico Nacional (IPN), Ramos Arizpe, Coahuila (Mexico). Centro de Investigacion y de Estudios Avanzados (CINVESTAV); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
The superhydrophobic and superhydrophilic surfaces and their transitions are of great interest for the production of self-cleaning, anti-biofouling, or corrosion-resistant materials. This research reports the wettability transition from superhydrophobic to superhydrophilic SiO2 nanoparticles functionalized with 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (POTS) and induced by temperature. The functionalization of these nanoparticles was confirmed by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy. The functionalization of SiO2 nanoparticles with POTS resulted in superhydrophobic surfaces with water contact angles up to 157°. A sudden transition to superhydrophilic behavior with water contact angles (WCA) below 5° was observed when the sample was heat-treated at 500 °C, despite the presence of fluorine on the surface of these nanoparticles, as confirmed by XPS and transmission electron microscopy. XPS suggested that the transition was caused by the change in orientation of the fluoroalkyl molecules and its partial decomposition due to the loss of the –CF3 group, resulting in shorter chains with a tail-end group with C–O bonds, which promoted the superhydrophilicity.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
National Council for Science and Technology (CONACYT); USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1872869
Journal Information:
Ceramics International, Journal Name: Ceramics International Journal Issue: 15 Vol. 48; ISSN 0272-8842
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (10)


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