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

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 (SiO? NPs) functionalized with different mono-alkoxy derivatives (methoxytrimethylsilane, TMeMS; ethoxydimethylvinylsilane, DMeVES; ethoxydimethylphenylsilane, DMePhES; and methoxydimethyloctylsilane, DMeC?MS) were added, assuring the microscale roughness on the glass surface. Influences of the functionalized SiO? NPs and surface morphology on the hydrophobicity of the hybrid films were discussed. The successful functionalization of SiO? NPs with hydrophobic alkyl groups were confirmed by Fourier transform infrared spectroscopy (FTIR). The thermal stability of hydrophobic SiO? NPs showed that the degradation of the alkyl groups takes place in the 200-400 °C range. Bilayer coating with C₁₆TMS/TMOS and SiO? NPs modified with alkoxysilane substituted with C? alkyl chain (SiO? NP-C?) has micro/nano structure. Hydrophobicity of functionalized SiO? NPs-C? and its higher degree of nanometer-scale roughness gave rise to ultra-hydrophobicity performance for bilayer coating C₁₆TMS/TMOS + SiO? NPs-C? (145°), compared to other similar hybrid structures. Our synthesis method for the functionalization of SiO? NPs is useful for the modification of surface polarity and roughness.

SUBMITTER: Petcu C

PROVIDER: S-EPMC5333032 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature

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

Petcu Cristian C Purcar Violeta V Spătaru Cătălin-Ilie CI Alexandrescu Elvira E Şomoghi Raluca R Trică Bogdan B Niţu Sabina Georgiana SG Panaitescu Denis Mihaela DM Donescu Dan D Jecu Maria-Luiza ML

Nanomaterials (Basel, Switzerland) 20170220 2

Ultra-hydrophobic bilayer coatings on a glass surface were fabricated by sol-gel process using hexadecyltrimethoxysilane (C<sub>16</sub>TMS) 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 t ...[more]

PMID: 28336881

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Project description:This paper presents the synthesis and physicochemical characterization of a new hybrid composite. Its main goals are evaluating the structure and studying the thermal and mechanical properties of the crosslinked polymeric materials based on varying chemical properties of the compounds. As an organic crosslinking monomer, bisphenol A glycerolate diacrylate (BPA.GDA) was used. Trimethoxyvinylsilane (TMVS) and N-vinyl-2-pyrrolidone (NVP) were used as comonomers and active diluents. The inorganic fraction was the silica in the form of nanoparticles (NANOSiO2). The hybrid composites were obtained by the bulk polymerization method using the UV initiator Irqacure 651 with a constant weight ratio of the tetrafunctional monomer BPA.GDA to TMVS or NVP (7:3 wt.%) and different wt.% of silica nanoparticles (0, 1, 3%). The proper course of polymerization was confirmed by the ATR/FTIR spectroscopy and SEM EDAX analysis. In the composites spectra the signals correspond to the C=O groups from NVP at 1672-1675 cm-1, and the vibrations of Si-O-C and Si-O-Si groups at 1053-1100 cm-1 from TMVS and NANOSiO2 are visible. Thermal stabilities of the obtained composites were studied by a differential scanning calorimetry DSC. Compared to NVP the samples with TMVS degraded in one stage (422.6-425.3 °C). The NVP-derived materials decomposed in three stages (three endothermic effects on the DSC curves). The addition of NANOSiO2 increases the temperature of composites maximum degradation insignificantly. Additionally, the Shore D hardness test was carried out with original metrological measurements of changes in diameter after indentation in relation to the type of material. The accuracy analysis of the obtained test results was based on a comparative analysis of graphical curves obtained from experimental tests. The values of the changes course of similarity in the examined factors, represented by those of characteristic coefficients were determined based on the Fréchet's theory.

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

Publications

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

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