Abstract
The paper studies the possibility of superhydrophobic coatings formations at exposure of powder mixture of polytetrafluorethylene and hydrocarbons having various molecular weights to low-energy electron beam in vacuum. It is shown that paraffin and PTFE based thin composite coatings may be characterized by superhydrophobic properties. The superhydrophobic properties are attained due to low surface energy of the fluorine-containing component and structured surface due to peculiarities of composite layer formation. The chemical processes observed in electron beam exposed area determine the molecular structure, morphology and the contact angle of thin organic coatings deposited. It is shown that high-molecular-weight hydrocarbon compounds should not be recommended for vacuum electron-beam deposition of superhydrophobic thin coatings because of deep changes in the molecular structure exposed to electron beam. These processes are responsible for high degree of unsaturation of the thin layer formed and for occurrence of oxygen-containing polar groups. The influence of substrate temperature on molecular structure, morphology and hydrophobic properties of thin coatings deposited is investigated. Potentially such coatings may be applied for deposition on the surface of metal capillaries used in biotechnological analyzers.
Highlights
If the contact angle of a solid surface exceeds 150°, such surface is called superhydrophobic [1, 2]
For attaining the goal it was necessary to solve a number of problems: to identify the impact of the nature and the ratio of the components on peculiarities of the chemical reactions observed in electron beam impact zone, the impact of the mentioned chemical processes, as well as the substrate temperature, on molecular structure, morphology and hydrophobic properties of thin coatings deposited
The reaction activity of the products of electron beam dispersion of hydrocarbons sequentially decreases in the series of paraffin, PE, UHMWPE
Summary
If the contact angle of a solid surface exceeds 150°, such surface is called superhydrophobic [1, 2]. The method of electron-beam forming of polymer coatings is devoid of most of the mentioned disadvantages It makes it possible to deposit the coatings of complex composition and structure onto the finished products using technologically simple equipment [19, 20]. The exposure of polymer materials to low-energy electron beam in vacuum is followed by formation of thin layers based on various macromolecular compounds, polytetrafluorethylene (PTFE) [21] in particular. For attaining the goal it was necessary to solve a number of problems: to identify the impact of the nature and the ratio of the components on peculiarities of the chemical reactions observed in electron beam impact zone, the impact of the mentioned chemical processes, as well as the substrate temperature, on molecular structure, morphology and hydrophobic properties of thin coatings deposited
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