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Papers by maria fortuna bevilacqua
Materials, 2015
In this work, two procedures for fabrication of polymeric microneedles based on direct photolitho... more In this work, two procedures for fabrication of polymeric microneedles based on direct photolithography, without any etching or molding process, are reported. Polyethylene glycol (average molecular weight 250 Da), casted into a silicone vessel and exposed to ultraviolet light (365 nm) through a mask, cross-links when added by a commercial photocatalyzer. By changing the position of the microneedles support with respect to the vessel, different shapes and lengths can be achieved. Microneedles from a hundred microns up to two millimeters have been obtained just tuning the radiation dose, by changing the exposure time (5-15 s) and/or the power density (9-18 mW/cm 2) during photolithography. Different microneedle shapes, such as cylindrical, conic or lancet-like, for specific applications such as micro-indentation or drug delivery, are demonstrated.
Lecture notes in electrical engineering, Jun 29, 2022
La risonanza suscitata dall’individuazione della classe dei fullereni e nanotubi di carbonio e le... more La risonanza suscitata dall’individuazione della classe dei fullereni e nanotubi di carbonio e legata alla possibilita di disegnare e progettare un materiale ad hoc per applicazioni in campo elettronico, sfruttando la connessione tra le caratteristiche geometriche del materiale e le proprieta elettroniche ad esso connesse. I nanotubi di carbonio a parete singola (SWNTs), possono avere le caratteristiche elettroniche sia di un metallo che di un semiconduttore a bandgap diretta a l’interesse verso questa classe di materiali e principalmente legato alla possibilita di sfruttare la modulabilita delle proprieta elettroniche per sostituire l’elettronica classica in silicio realizzando, ad esempio, dispositivi ad effetto di campo che utilizzino nanotubi semiconduttori come canali (CNT-FET). Nel caso della dispositivistica basata sui CNTs, cio che ha fortemente ridimensionato il raggiungimento della maturita necessaria al processo di integrazione dei nanotubi in dispositivi commercializzabi...
Lecture Notes in Electrical Engineering, 2017
Multianalyte biosensor patch based on polymeric microneedles (MNs) have been fabricated by photol... more Multianalyte biosensor patch based on polymeric microneedles (MNs) have been fabricated by photolithography of poly (ethylene glycol) diacrylate (PEGDA) and have been dynamically characterized by means of quartz crystal microbalance and electrochemical measurements. The resulting flexible device acts as multianalyte working electrodes detecting glucose and lactic acid into interstitial liquid by means of redox reaction with glucose oxidase (GOx) and lactose oxidase (LOx) enzymes. Sensitivities of the order of nA mM−1 in the mM range are revealed in both case, after five minutes of swelling time and ten second of interaction.
Materials, 2015
In this work, two procedures for fabrication of polymeric microneedles based on direct photolitho... more In this work, two procedures for fabrication of polymeric microneedles based on direct photolithography, without any etching or molding process, are reported. Polyethylene glycol (average molecular weight 250 Da), casted into a silicone vessel and exposed to ultraviolet light (365 nm) through a mask, cross-links when added by a commercial photocatalyzer. By changing the position of the microneedles support with respect to the vessel, different shapes and lengths can be achieved. Microneedles from a hundred microns up to two millimeters have been obtained just tuning the radiation dose, by changing the exposure time (5-15 s) and/or the power density (9-18 mW/cm 2) during photolithography. Different microneedle shapes, such as cylindrical, conic or lancet-like, for specific applications such as micro-indentation or drug delivery, are demonstrated.
Lecture notes in electrical engineering, Jun 29, 2022
La risonanza suscitata dall’individuazione della classe dei fullereni e nanotubi di carbonio e le... more La risonanza suscitata dall’individuazione della classe dei fullereni e nanotubi di carbonio e legata alla possibilita di disegnare e progettare un materiale ad hoc per applicazioni in campo elettronico, sfruttando la connessione tra le caratteristiche geometriche del materiale e le proprieta elettroniche ad esso connesse. I nanotubi di carbonio a parete singola (SWNTs), possono avere le caratteristiche elettroniche sia di un metallo che di un semiconduttore a bandgap diretta a l’interesse verso questa classe di materiali e principalmente legato alla possibilita di sfruttare la modulabilita delle proprieta elettroniche per sostituire l’elettronica classica in silicio realizzando, ad esempio, dispositivi ad effetto di campo che utilizzino nanotubi semiconduttori come canali (CNT-FET). Nel caso della dispositivistica basata sui CNTs, cio che ha fortemente ridimensionato il raggiungimento della maturita necessaria al processo di integrazione dei nanotubi in dispositivi commercializzabi...
Lecture Notes in Electrical Engineering, 2017
Multianalyte biosensor patch based on polymeric microneedles (MNs) have been fabricated by photol... more Multianalyte biosensor patch based on polymeric microneedles (MNs) have been fabricated by photolithography of poly (ethylene glycol) diacrylate (PEGDA) and have been dynamically characterized by means of quartz crystal microbalance and electrochemical measurements. The resulting flexible device acts as multianalyte working electrodes detecting glucose and lactic acid into interstitial liquid by means of redox reaction with glucose oxidase (GOx) and lactose oxidase (LOx) enzymes. Sensitivities of the order of nA mM−1 in the mM range are revealed in both case, after five minutes of swelling time and ten second of interaction.