Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Electro-thermal poling in bioactive sodium‑calcium phosphate-silicate glass: Anodic near-surface network connectivity changes and second harmonic generation
Δημιουργός/Συγγραφέας:	[EL] Παλλές, Δημήτρης[EN] Palles, Dimitris Dussauze, M. Mariappan, C.R. Rodriguez, V. Roling, B. [EL] Καμίτσος, Ευστράτιος Ι.[EN] Kamitsos, Efstratios I.
Ημερομηνία:	2023
Γλώσσα:	Αγγλικά
ISSN:	25901591
DOI:	10.1016/j.nocx.2023.100164
Περίληψη:	We report Raman spectra in the sub-anodic region after electro-thermal poling of the 46S4 bioglass and show a correlation between structural changes and the induced second harmonic generation (SHG). The Raman peak at ca. 625 cm−1, due to the symmetric stretching-bending vibration of Si-O-Si bridges, was employed to quantify the poling-induced structural changes since its frequency νs(Si-O-Si) varies linearly with the silicate network connectivity, NC. Key results include the increase of network connectivity towards the anode after poling, with NC varying from 2.24 before poling to 2.37 at the anode after poling. SHG measurements showed the presence of an optically-inactive layer of 1.0 μm thick below the anode, followed by an optically-active layer where the SHG signal is maximized from about 1.5 to 4.0 μm. In this layer the NC takes intermediate values and reflects modest changes with respect to the pristine bioglass. The present findings suggest that the transport of electrons near the metal film anode is faster than the Na ion transport towards the cathode.
Τίτλος πηγής δημοσίευσης:	Journal of Non-Crystalline Solids: X
Τόμος/Κεφάλαιο:	17
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Φασματοσκοπία[EN] Spectroscopy
Λέξεις-Κλειδιά:	phosphate-silicate bioglasses electro-thermal poling Raman spectroscopy second harmonic generation network connectivity
Κάτοχος πνευματικών δικαιωμάτων:	© 2023 The Authors. Published by Elsevier B.V.
Όροι και προϋποθέσεις δικαιωμάτων:	This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/).
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://doi.org/10.1016/j.nocx.2023.100164
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο