Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Photons probe entropic potential variation during molecular confinement in nanocavities
Δημιουργός/Συγγραφέας:	Gavriil V. Chatzichristidi M. [EL] Κόλλια, Ζωή[EN] Kollia, Zoe [EL] Κεφαλάς, Αλκιβιάδης Κωνσταντίνος[EN] Cefalas, Alciviadis Constantinos Spyropoulos-Antonakakis N. Semashko V.V. [EL] Σαραντοπούλου, Ευαγγελία[EN] Sarantopoulou, Evangelia
Εκδότης:	MDPI AG
Ημερομηνία:	2018
Γλώσσα:	Αγγλικά
ISSN:	1099-4300
DOI:	10.3390/e20080545
Περίληψη:	In thin polymeric layers, external molecular analytes may well be confined within tiny surface nano/microcavities, or they may be attached to ligand adhesion binding sites via electrical dipole forces. Even though molecular trapping is followed by a variation of the entropic potential, the experimental evidence of entropic energy variation from molecular confinement is scarce because tiny thermodynamic energy density diverseness can be tracked only by sub-nm surface strain. Here, it is shown that water confinement within photon-induced nanocavities in Poly (2-hydroxyethyl methacrylate), (PHEMA) layers could be trailed by an entropic potential variation that competes with a thermodynamic potential from electric dipole attachment of molecular adsorbates in polymeric ligands. The nano/microcavities and the ligands were fabricated on a PHEMA matrix by vacuum ultraviolet laser photons at 157 nm. The entropic energy variation during confinement of water analytes on the photon processed PHEMA layer was monitored via sub-nm surface strain by applying white light reflectance spectroscopy, nanoindentation, contact angle measurements, Atomic Force Microscopy (AFM) imaging, and surface and fractal analysis. The methodology has the potency to identify entropic energy density variations less than 1 pJm-3 and to monitor dipole and entropic fields on biosurfaces.
Τίτλος πηγής δημοσίευσης:	Entropy
Τόμος/Κεφάλαιο:	20
Τεύχος:	8
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Εφαρμοσμένη οπτική. Φωτονική[EN] Applied optics. Photonics
Λέξεις-Κλειδιά:	157 nm laser Atomic Force Microscopy Electric dipole interactions Entropy Fractal analysis Nanoindentation Nanothermodynamics PHEMA Water contact angle White light reflectance spectroscopy
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2018 by the authors.
Όροι και προϋποθέσεις δικαιωμάτων:	All Open Access, Gold, Green
Σημειώσεις:	3.1156.2017/4.6, 3.5835.2017/6.7; European Commission, EC; European Regional Development Fund, FEDER Funding: We acknowledge support of this work by the project “Advanced Materials and Devices” (MIS 5002409) which is implemented under the “Action for the Strategic Development on the Research and Technological Sector”, funded by the Operational Programme “Competitiveness, Entrepreneurship and Innovation” (NSRF 2014-2020) and co-financed by Greece and the European Union (European Regional Development Fund) and by the subsidy allocated to KFU for the state assignment in the sphere of scientific activities [3.1156.2017/4.6, 3.5835.2017/6.7].
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο