The Influence of New Hydrophobic Silica Nanoparticles on the Surface Properties of the Films Obtained from Bilayer Hybrids

  • Nanomaterials (Basel). 2017 Feb 20;7(2):47. doi: 10.3390/nano7020047.
Cristian Petcu  1 ,  Violeta Purcar  2 ,  Cătălin-Ilie Spătaru  3 ,  Elvira Alexandrescu  4 ,  Raluca Şomoghi  5 ,  Bogdan Trică  6 ,  Sabina Georgiana Niţu  7 ,  Denis Mihaela Panaitescu  8 ,  Dan Donescu  9 ,  Maria-Luiza Jecu  10
Affiliations
  • 1. R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  • 2. R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  • 3. R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  • 4. R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  • 5. R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  • 6. R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  • 7. R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  • 8. R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  • 9. R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  • 10. R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
PMID: 28336881 DOI: 10.3390/nano7020047
Abstract

Ultra-hydrophobic bilayer coatings on a glass surface were fabricated by sol-gel process using hexadecyltrimethoxysilane (C16TMS) and tetramethoxysilane (TMOS) (1:4 molar ratio) as precursors. After coating, silica nanoparticles (SiO₂ NPs) functionalized with different mono-alkoxy derivatives (methoxytrimethylsilane, TMeMS; ethoxydimethylvinylsilane, DMeVES; ethoxydimethylphenylsilane, DMePhES; and methoxydimethyloctylsilane, DMeC₈MS) were added, assuring the microscale roughness on the glass surface. Influences of the functionalized SiO₂ NPs and surface morphology on the hydrophobicity of the hybrid films were discussed. The successful functionalization of SiO₂ NPs with hydrophobic alkyl groups were confirmed by Fourier transform infrared spectroscopy (FTIR). The thermal stability of hydrophobic SiO₂ NPs showed that the degradation of the alkyl groups takes place in the 200-400 °C range. Bilayer coating with C16TMS/TMOS and SiO₂ NPs modified with alkoxysilane substituted with C₈ alkyl chain (SiO₂ NP-C₈) has micro/nano structure. Hydrophobicity of functionalized SiO₂ NPs-C₈ and its higher degree of nanometer-scale roughness gave rise to ultra-hydrophobicity performance for bilayer coating C16TMS/TMOS + SiO₂ NPs-C₈ (145°), compared to Other similar hybrid structures. Our synthesis method for the functionalization of SiO₂ NPs is useful for the modification of surface polarity and roughness.

Keywords
nanostructuration; organic–inorganic hybrids; silica nanoparticles; sol–gel process; trialkylmonoalkoxysilanes.
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