Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Functional surfaces of laser-microstructured silicon coated with thermoresponsive PS/PNIPAM polymer blends: switching reversibly between hydrophilicity and hydrophobicity
Δημιουργός/Συγγραφέας:	Kanidi, Maria [EL] Παπαγιαννόπουλος, Αριστείδης[EN] Papagiannopoulos, Aristeidis Matei, Andreea Dinescu, Maria [EL] Πίσπας, Στέργιος[EN] Pispas, Stergios [EL] Κάνδυλα, Μαρία[EN] Kandyla, Maria
Εκδότης:	Elsevier
Ημερομηνία:	2020-06-22
Γλώσσα:	Αγγλικά
ISSN:	01694332
DOI:	10.1016/j.apsusc.2020.146841
Περίληψη:	We developed functional surfaces of laser-microstructured silicon coated with blends of polystyrene (PS) and poly(N-isopropylacrylamide) (PNIPAM) and we study their switching wetting behavior between hydrophilicity and hydrophobicity. Large areas of silicon are processed with reproducible surface micromorphology and spin-coated with PS/PNIPAM blends of two blend ratios. The wetting behavior of the surfaces is modified by the combination of surface topography and surface chemistry effects. PS/PNIPAM films are casted on flat and microstructured silicon substrates with or without a native SiO2 layer. All films respond to the stimulus of temperature and films casted on microstructured silicon substrates with a native SiO2 layer show the highest thermoresponsiveness presumably because they adopt a more favorable structure. Microstructuring provides a large specific area that extends the contact of PNIPAM chains with water molecules according to the Wenzel model, and thus increasing the film thermoresponsiveness, resulting in a reversible transition from hydrophilicity to hydrophobicity upon heating. The absence of the native SiO2 layer from the silicon substrates affects the PS and PNIPAM arrangement in the films, increasing the water contact angle both below and above the lower critical solution temperature of PNIPAM and decreasing their thermoresponsiveness.
Τίτλος πηγής δημοσίευσης:	Applied Surface Science
Τόμος/Κεφάλαιο:	527
Σελίδες:	146841
Θεματική Κατηγορία:	[EL] Φυσική[EN] Physics [EL] Χημικά προϊόντα: Παραγωγή, χρήση κλπ[EN] Chemicals: Manufacture, use etc. [EL] Φασματοσκοπία[EN] Spectroscopy
Λέξεις-Κλειδιά:	Laser-microstructured silicon PNIPAM Thermoresponsive polymers Wettability Blends Spin coating
Κάτοχος πνευματικών δικαιωμάτων:	Copyright © 2020 Elsevier B.V. All rights reserved.
Ηλεκτρονική διεύθυνση στον εκδότη (link):	http://arxiv.org/pdf/2006.12236v1 https://www.sciencedirect.com/science/article/abs/pii/S0169433220315981?via%3Dihub
Ηλεκτρονική διεύθυνση περιοδικού (link) :	https://www.sciencedirect.com/journal/applied-surface-science
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο