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Controlling Lengthscales in Water-Solvent Induced Self-Organized Dewetting of Thin Polystyrene Films by Modulating the Surface Properties of the Substrate.
- Source :
-
Journal of Macromolecular Science: Physics . 2022, Vol. 61 Issue 7/8, p914-925. 12p. - Publication Year :
- 2022
-
Abstract
- We report here a facile method of modulating the lengthscales of self-organized dewetting of polystyrene thin films by varying the extent of silane grafting on the substrate. The self-assembled monolayers (SAM) of octadecyltrichlorosilane (OTS) were grafted on glass substrates by exposing them to different doses of OTS vapors in a controlled, low pressure environment. Measurement of water contact angles on the modified glass surfaces showed that the contact angles could be continuously increased from 40° to 70° by increasing the time of exposure to the OTS vapors from a few minutes to several hours. Polystyrene (PS) thin films were spin coated on the modified glass substrates and water-solvent mixture induced dewetting of the PS thin films was carried out, where the dewetting kinetics depended on the spreadability of water on the surface. We observed a reduction in the length scales of the dewetting, i.e. the wavelength of instability (λ) and droplet size (d), by increasing the extent of OTS exposure. The λ for a 50 nm thick PS film decreased from 12 to 4 µm while the droplet diameter (d) also decreased, from 2.5 to 1.6 µm. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222348
- Volume :
- 61
- Issue :
- 7/8
- Database :
- Academic Search Index
- Journal :
- Journal of Macromolecular Science: Physics
- Publication Type :
- Academic Journal
- Accession number :
- 159934257
- Full Text :
- https://doi.org/10.1080/00222348.2022.2118482