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2. Morphology and magneto-transport in exfoliated graphene on ultrathin crystalline \b{eta}-Si3N4(0001)/Si(111)

Author

Salimian, Sedighe, Xiang, Shaohua, Colonna, Stefano, Ronci, Fabio, Fosca, Marco, Rossella, Francesco, Beltram, Fabio, Flammini, Roberto, and Heun, Stefan

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science, Physics - Applied Physics
Abstract

We report the first experimental study of graphene transferred on \b{eta}-Si3N4(0001)/Si(111). Our work provides a comprehensive quantitative understanding of the physics of ultrathin Si3N4 as a gate dielectric for graphene-based devices. The Si3N4 film was grown on Si(111) under ultra-high vacuum (UHV) conditions and investigated by scanning tunneling microscopy (STM). Subsequently, a graphene flake was deposited on top of it by a polymer-based transfer technique, and a Hall bar device was fabricated from the graphene flake. STM was employed again to study the graphene flake under UHV conditions after device fabrication and showed that surface quality is preserved. Electrical transport measurements, carried out at low temperature in magnetic field, revealed back gate modulation of carrier type and density in the graphene channel and showed the occurrence of weak localization. Under these experimental conditions, no leakage current between back gate and graphene channel was detected.

Published
2020
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8. Coated Biodegradable Zinc Lithium Alloys: Development and Characterization of Co-Doped Strontium Copper Tricalcium Phosphate Coating for Antimicrobial Applications.

Author

Rau, Julietta V., De Bonis, Angela, Curcio, Mariangela, Barbaro, Katia, Fosca, Marco, Fadeeva, Inna V., Cardoso, Giovana Collombaro, Teghil, Roberto, Slonskaya, Tatiana K., and Zheng, Yufeng

Subjects
PHOSPHATE coating, LITHIUM alloys, COPPER, ZINC alloys, FOURIER transform infrared spectroscopy, GRAM-positive bacteria
Abstract

Zinc biodegradable implants represent a revolutionary advancement in medical technology, offering a promising alternative to titanium and stainless-steel implants and avoiding the need for secondary surgeries for removal. In this study, we aimed to fulfil the clinical demand for biodegradable implant materials by applying a coating of double-doped strontium and copper resorbable tricalcium phosphate (SrCu-TCP) onto a zinc-lithium (Zn-Li) biodegradable alloy using the Pulsed Laser Deposition method. The coated surfaces were thoroughly characterized using X-ray Diffraction, Fourier Transform Infrared Spectroscopy, Atomic Force Microscopy, and Scanning Electron Microscopy coupled with Energy Dispersive X-ray. Microbiology experiments were conducted to assess the inhibitory effects on the growth of various bacteria strains, including gram-positive Staphylococcus aureus and Enterococcus faecalis, gram-negative Pseudomonas aeruginosa and Escherichia coli, as well as the fungus Candida albicans. The obtained results showed that the roughness of the Zn-Li alloy increased from 91.8 ± 29.4 to 651.0 ± 179.5 nm when coated with SrCu-TCP. The thickness of the coating ranged between 3–3.5 µm. The inhibition of growth for all four bacteria strains and the fungus was in the range of 24–35% when cultured on SrCu-TCP coated Zn-Li samples. These findings suggest that the developed coatings are promising candidates for applications requiring inhibition of microorganisms. [ABSTRACT FROM AUTHOR]

Published
2024
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15. In Vitro Studies Regarding the Effect of Cellulose Acetate-Based Composite Coatings on the Functional Properties of the Biodegradable Mg3Nd Alloys

Author

Streza, Alexandru, primary, Antoniac, Aurora, additional, Manescu (Paltanea), Veronica Manescu, additional, Ciocoiu, Robert, additional, Cotrut, Cosmin-Mihai, additional, Miculescu, Marian, additional, Miculescu, Florin, additional, Antoniac, Iulian, additional, Fosca, Marco, additional, Rau, Julietta V., additional, and Dura, Horatiu, additional

Published
2023
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19. Relationship between Reflectivity, Chemical Composition and Mechanical Behaviour of Orthodontic Bonding Nanofiller Resin Materials: A Proposal of an Alternative Method of Investigation

Author

Condò, Roberta, primary, Mampieri, Gianluca, additional, Cioffi, Alessandro, additional, Pirelli, Paola, additional, Giancotti, Aldo, additional, Maiolo, Luca, additional, Maita, Francesco, additional, Convertino, Annalisa, additional, Lucarini, Ivano, additional, Notargiacomo, Andrea, additional, Rau, Julietta V., additional, Fosca, Marco, additional, and Marzo, Giuseppe, additional

Published
2022
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21. Effect of the Antimicrobial Agents Peppermint Essential Oil and Silver Nanoparticles on Bone Cement Properties

Author

Robu, Alina, primary, Antoniac, Aurora, additional, Ciocoiu, Robert, additional, Grosu, Elena, additional, Rau, Julietta V., additional, Fosca, Marco, additional, Krasnyuk, Ivan I., additional, Pircalabioru, Gratiela Gradisteanu, additional, Manescu (Paltanea), Veronica, additional, Antoniac, Iulian, additional, and Gradinaru, Sebastian, additional

Published
2022
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23. Strontium Substituted Tricalcium Phosphate Bone Cement: Short and Long‐Term Time‐Resolved Studies and In Vitro Properties

Author

Rau, Julietta V., primary, Fadeeva, Inna V., additional, Forysenkova, Anna A., additional, Davydova, Galina A., additional, Fosca, Marco, additional, Filippov, Yaroslav Yu., additional, Antoniac, Iulian V., additional, Antoniac, Aurora, additional, D'Arco, Annalisa, additional, Di Fabrizio, Marta, additional, Petrarca, Massimo, additional, Lupi, Stefano, additional, Di Menno Di Bucchianico, Massimo, additional, Yankova, Viktoriya G., additional, Putlayev, Valery I., additional, and Cristea, Mihai Bogdan, additional

Published
2022
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25. Double Substituted with Manganese and Strontium Tricalcium Phosphate Coatings on Zinc-Lithium Biodegradable Alloys for Biomedical Implant Applications.

Author

Rau, Julietta V., De Bonis, Angela, Teghil, Roberto, Curcio, Mariangela, Fadeeva, Inna V., Barbaro, Katia, Di Menno Di Bucchianico, Massimo, Fosca, Marco, and Zheng, Yufeng

Subjects
PHOSPHATE coating, ZINC alloys, STRONTIUM, FOURIER transform infrared spectroscopy, PULSED laser deposition, X-ray photoelectron spectroscopy, MANGANESE, CANDIDA albicans
Abstract

To address the clinical needs for biodegradable implant materials, in this work, zinc-lithium (Zn-Li) biodegradable alloy was coated with double-doped manganese and strontium resorbable tricalcium phosphate (Mn,Sr-TCP). The Pulsed Laser Deposition method was applied for coating preparation. For coating characterization, Fourier Transform Infrared Spectroscopy, X-ray Diffraction, Scanning Electron Microscopy coupled with Energy Dispersive X-ray, and X-ray Photoelectron Spectroscopy were used. The microbiology experiments were performed, testing the inhibition of growth of Gram-positive (Staphylococcus aureus, Enterococcus faecalis) and Gram-negative (Salmonella typhimurium, Escherichia coli) bacteria strains and Candida albicans fungus. The obtained results evidenced about 10% of inhibition of all four bacteria strains by the Mn,Sr-TCP-coated Zn-Li samples, exerting the most pronounced effect on C. albicans fungus (about 50% of inhibition of growth). The prepared coatings can be useful for improving the degradation behavior and biological characteristics of Zn-Li alloys. [ABSTRACT FROM AUTHOR]

Published
2023
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26. High-Fat Diet Impairs Mouse Median Eminence: A Study by Transmission and Scanning Electron Microscopy Coupled with Raman Spectroscopy

Author

Severi, Ilenia, primary, Fosca, Marco, additional, Colleluori, Georgia, additional, Marini, Federico, additional, Imperatori, Luca, additional, Senzacqua, Martina, additional, Di Vincenzo, Angelica, additional, Barbatelli, Giorgio, additional, Fiori, Fabrizio, additional, Rau, Julietta V., additional, and Giordano, Antonio, additional

Published
2021
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27. Thermal crystallization of amorphous calcium phosphate combined with citrate and fluoride doping: a novel route to produce hydroxyapatite bioceramics

Author

Degli Esposti, Lorenzo, Marković, Smilja, Ignjatović, Nenad, Panseri, Silvia, Montesi, Monica, Adamiano, Alessio, Fosca, Marco, Rau, Julietta V., Uskoković, Vuk, and Iafisco, Michele

Subjects
animal structures, stomatognathic system, fluoride, bioceramics, hydroxyapatite, lipids (amino acids, peptides, and proteins), doping, citrate, amorphous materials, humanities, calcium phosphate
Abstract

Amorphous calcium phosphate (ACP) is a material of high interest for dentistry, orthopedics, and other biomedical sectors. Being intrinsically metastable, the process of transformation of ACP into a crystalline phase upon heating is of high relevance for the development of innovative bioceramics. Here we have first studied the thermal behavior of a citrate-stabilized ACP (Cit-ACP) also doped with fluoride ions (Cit-FACP) prepared at three different nominal Cit/Ca ratios (i.e. 4, 2, 1) by differential thermal analysis. Next, the physico-chemical features of the crystalline products as well as the in vitro cell response to the materials were investigated. A citrate and fluoride free ACP sample was also tested as the blank. We have found that the activation energy of crystallization of Cit-(F)ACP samples is lower in comparison to the blank ACP and this is influenced by the nominal Cit/Ca molar ratio. Interestingly, we have discovered that the thermal treatment of Cit-(F)ACP at 800 °C yields hydroxyapatite (HA) or fluorapatite (FHA) as the main products differently from blank ACP that, like most of the ACPs reported in the literature, yields β-tricalcium phosphate. This was attributed to the Ca/P ratio of Cit-(F)ACP, which is similar to HA. A study of the crystalline products has revealed that all the (F)HA samples were non-cytotoxic, and retained carbonate ions in the crystal structure despite the heat treatment that should have induced decarbonation. The morphology of the products is influenced by the nominal Cit/Ca ratio and the presence of fluoride, ranging from spherical nanoparticles to micrometric hexagonal rods. Overall, our results prove that the thermal crystallization of Cit-(F)ACP is markedly different from classic ACP based materials and the thermal treatment of Cit-(F)ACP represents an attractive route for producing pure bioactive HA ceramics. This is the peer-reviewed version of the article: Degli Esposti Lorenzo, Marković Smilja, Ignjatović Nenad, Panseri Silvia, Montesi Monica, Adamiano Alessio, Fosca Marco, Rau Julietta V., Uskoković Vuk, Iafisco Michele, "Thermal crystallization of amorphous calcium phosphate combined with citrate and fluoride doping: a novel route to produce hydroxyapatite bioceramics" Journal of Materials Chemistry B, 9, no. 24 (2021):4832-4845, [https://doi.org/10.1039/D1TB00601K] Supplementary information: [https://hdl.handle.net/21.15107/rcub_dais_11642]

Published
2021

28. Electronic Supplementary Information associated with the article: Degli Esposti Lorenzo, Marković Smilja, Ignjatović Nenad, Panseri Silvia, Montesi Monica, Adamiano Alessio, Fosca Marco, Rau Julietta V., Uskoković Vuk, Iafisco Michele, 'Thermal crystallization of amorphous calcium phosphate combined with citrate and fluoride doping: a novel route to produce hydroxyapatite bioceramics.' Journal of Materials Chemistry B, 9, no. 24 (2021):4832-4845, https://doi.org/10.1039/D1TB00601K

Author

Degli Esposti, Lorenzo, Degli Esposti, Lorenzo, Marković, Smilja, Ignjatović, Nenad, Panseri, Silvia, Montesi, Monica, Adamiano, Alessio, Fosca, Marco, Rau, Julietta V., Uskoković, Vuk, Iafisco, Michele, Degli Esposti, Lorenzo, Degli Esposti, Lorenzo, Marković, Smilja, Ignjatović, Nenad, Panseri, Silvia, Montesi, Monica, Adamiano, Alessio, Fosca, Marco, Rau, Julietta V., Uskoković, Vuk, and Iafisco, Michele

Abstract

Figure S1. The shift in the crystallization peak for (A) Cit-ACP-1 and (B) Cit-FACP-1 to higher temperatures in direct proportion with the heating rate; Figure S2. TGA curves of calcined Cit-ACP-4, Cit-ACP-2, and Cit-ACP-1; Figure S3. Pictures of calcined (A) Cit-ACP-4 and (B) Cit-ACP-1

Published
2021

30. Thermal crystallization of amorphous calcium phosphate combined with citrate and fluoride doping: a novel route to produce hydroxyapatite bioceramics

Author

Degli Esposti, Lorenzo, primary, Markovic, Smilja, additional, Ignjatovic, Nenad, additional, Panseri, Silvia, additional, Montesi, Monica, additional, Adamiano, Alessio, additional, Fosca, Marco, additional, Rau, Julietta V., additional, Uskoković, Vuk, additional, and Iafisco, Michele, additional

Published
2021
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31. In Vitro Properties of Manganese-Substituted Tricalcium Phosphate Coatings for Titanium Biomedical Implants Deposited by Arc Plasma

Author

Fadeeva, Inna V., primary, Kalita, Vasilii I., additional, Komlev, Dmitry I., additional, Radiuk, Alexei A., additional, Fomin, Alexander S., additional, Davidova, Galina A., additional, Fursova, Nadezhda K., additional, Murzakhanov, Fadis F., additional, Gafurov, Marat R., additional, Fosca, Marco, additional, Antoniac, Iulian V., additional, Barinov, Sergey M., additional, and Rau, Julietta V., additional

Published
2020
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32. Iron Ion‐Doped Tricalcium Phosphate Coatings Improve the Properties of Biodegradable Magnesium Alloys for Biomedical Implant Application

Author

Antoniac, Iulian V., primary, Filipescu, Mihaela, additional, Barbaro, Katia, additional, Bonciu, Anca, additional, Birjega, Ruxandra, additional, Cotrut, Cosmin M., additional, Galvano, Ettore, additional, Fosca, Marco, additional, Fadeeva, Inna V., additional, Vadalà, Gianluca, additional, Dinescu, Maria, additional, and Rau, Julietta V., additional

Published
2020
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34. Morphology and Magneto‐Transport in Exfoliated Graphene on Ultrathin Crystalline β‐Si3N4(0001)/Si(111).

Author

Salimian, Sedighe, Xiang, Shaohua, Colonna, Stefano, Ronci, Fabio, Fosca, Marco, Rossella, Francesco, Beltram, Fabio, Flammini, Roberto, and Heun, Stefan

Subjects
SCANNING tunneling microscopy, GRAPHENE, DIELECTRIC devices, CARRIER density, INDIUM gallium zinc oxide, FIELD-effect transistors
Abstract

This work reports the first experimental study of graphene transferred on β‐Si3N4(0001)/Si(111). A comprehensive quantitative understanding of the physics of ultrathin Si3N4 as a gate dielectric for graphene‐based devices is provided. The Si3N4 film is grown on Si(111) under ultra‐high vacuum (UHV) conditions and investigated by scanning tunneling microscopy (STM). Subsequently, a graphene flake is deposited on top of it by a polymer‐based transfer technique, and a Hall bar device is fabricated from the graphene flake. STM is employed again to study the graphene flake under UHV conditions after device fabrication and shows that the surface quality is preserved. Electrical transport measurements, carried out at low temperature in magnetic field, reveal back gate modulation of carrier density in the graphene channel and show the occurrence of weak localization. Under these experimental conditions, no leakage current between back gate and graphene channel is detected. [ABSTRACT FROM AUTHOR]

Published
2020
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35. Raman Spectroscopy Applied to Parathyroid Tissues: A New Diagnostic Tool to Discriminate Normal Tissue from Adenoma

Author

Palermo, Andrea, primary, Fosca, Marco, additional, Tabacco, Gaia, additional, Marini, Federico, additional, Graziani, Valerio, additional, Santarsia, Maria Carla, additional, Longo, Filippo, additional, Lauria, Angelo, additional, Cesareo, Roberto, additional, Giovannoni, Isabella, additional, Taffon, Chiara, additional, Rocchia, Massimiliano, additional, Manfrini, Silvia, additional, Crucitti, Pierfilippo, additional, Pozzilli, Paolo, additional, Crescenzi, Anna, additional, and Rau, Julietta V., additional

Published
2017
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38. Raman Spectroscopy Applied to Parathyroid Tissues: A New Diagnostic Tool to Discriminate Normal Tissue from Adenoma

Author

Palermo, Andrea, Fosca, Marco, Tabacco, Gaia, Marini, Federico, Graziani, Valerio, Santarsia, Maria Carla, Longo, Filippo, Lauria, Angelo, Cesareo, Roberto, Giovannoni, Isabella, Taffon, Chiara, Rocchia, Massimiliano, Manfrini, Silvia, Crucitti, Pierfilippo, Pozzilli, Paolo, Crescenzi, Anna, and Rau, Julietta V.

Abstract

Primary hyperparathyroidism is an endocrine disorder characterized by autonomous production of parathyroid hormone. Patients with the symptomatic disease should be referred for parathyroidectomy. However, the distinction between the pathological condition and the benign one is very challenging in the surgical setting; therefore, accurate recognition is important to ensure success during minimally invasive surgery. At present, all intraoperative techniques significantly increase surgical time and, consequently, cost. In this proof-of-concept study, Raman microscopy was used to differentiate between healthy parathyroid tissue and parathyroid adenoma from 18 patients. The data showed different spectroscopic features for the two main tissue types of healthy and adenoma. Moreover, the parathyroid adenoma subtypes (chief cells and oxyphil cells) were characterized by their own Raman spectra. The partial least-squares discriminant analysis (PLS-DA) model built to discriminate healthy from adenomatous parathyroid tissue was able to correctly classify all samples in the calibration and validation data sets, providing 100% prediction accuracy. The PLS-DA model built to discriminate chief cell adenoma from oxyphil cell adenoma allowed us to correctly classify >99% of the spectra during calibration and cross-validation and to correctly predict 100% of oxyphil and 99.8% of chief cells in the external validation data set. The results clearly demonstrate the great potential of Raman spectroscopy. The final goal would be development of a Raman portable fiber probe device for intraoperative optical biopsy, both to improve the surgical success rate and reduce surgical cost.

Published
2024
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39. In Situ Time-Resolved Studies of Octacalcium Phosphate and Dicalcium Phosphate Dihydrate in Simulated Body Fluid: Cooperative Interactions and Nanoapatite Crystal Growth

Author

Rau, Julietta V., Fosca, Marco, Komlev, Vladimir S., Fadeeva, Inna V., Rossi Albertini, Valerio, and Barinov, Sergey M.

Abstract

The present study is focused on the in vitro study of the biphasic octacalcium phosphate (OCP)−dicalcium phosphate dihydrate (DCPD) system transformations in simulated body fluid (SBF) for possible applications as bone substitute materials. The aim of this paper is to outline the role of the additional component DCPD during a transformation/crystallization processes. Energy dispersive X-ray diffraction and FTIR spectroscopy techniques were used for in situ monitoring of the processes taking place in the system in real time. Morphological investigations were performed applying the scanning electron microscopy technique. Several OCP−DCPD combinations were investigated: (1) 100% OCP; (2) 70% OCP−30% DCPD; (3) 100% DCPD. The obtained experimental results allowed us to conclude that when only OCP is present in SBF, the formation of carbonated hydroxyapatite takes place, whereas for the OCP−DCPD (30%) system in SBF, less kinetically favorable hydroxyapatite (HA) is formed. The additional component (DCPD) influences significantly the structural behavior of hydroxyapatite, acting as the HA crystallization inhibition agent. By means of this approach, allowing for the control of the HA crystallization, the calcium phosphate based biomaterials can be suitably modified for implant use in bone tissue engineering. The results obtained in this work provided some insights into the biomineralization mechanism.

Published
2024
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42. Raman Spectroscopy Applied to Parathyroid Tissues: A New Diagnostic Tool to Discriminate Normal Tissue from Adenoma.

Author

Palermo, Andrea, Fosca, Marco, Tabacco, Gaia, Marini, Federico, Graziani, Valerio, Santarsia, Maria Carla, Longo, Filippo, Lauria, Angelo, Cesareo, Roberto, Giovannoni, Isabella, Taffon, Chiara, Rocchia, Massimiliano, Manfrini, Silvia, Crucitti, Pierfilippo, Pozzilli, Paolo, Crescenzi, Anna, and Rau, Julietta V.

Subjects
*RAMAN spectroscopy, *HYPERPARATHYROIDISM treatment, *PARATHYROIDECTOMY, *PARATHYROID hormone, *HYPERPLASIA
Abstract

Primary hyperparathyroidism is an endocrine disorder characterized by autonomous production of parathyroid hormone. Patients with the symptomatic disease should be referred for parathyroidectomy. However, the distinction between the pathological condition and the benign one is very challenging in the surgical setting; therefore, accurate recognition is important to ensure success during minimally invasive surgery. At present, all intraoperative techniques significantly increase surgical time and, consequently, cost. In this proof-of-concept study, Raman microscopy was used to differentiate between healthy parathyroid tissue and parathyroid adenoma from 18 patients. The data showed different spectroscopic features for the two main tissue types of healthy and adenoma. Moreover, the parathyroid adenoma subtypes (chief cells and oxyphil cells) were characterized by their own Raman spectra. The partial least-squares discriminant analysis (PLS-DA) model built to discriminate healthy from adenomatous parathyroid tissue was able to correctly classify all samples in the calibration and validation data sets, providing 100% prediction accuracy. The PLS-DA model built to discriminate chief cell adenoma from oxyphil cell adenoma allowed us to correctly classify >99% of the spectra during calibration and cross-validation and to correctly predict 100% of oxyphil and 99.8% of chief cells in the external validation data set. The results clearly demonstrate the great potential of Raman spectroscopy. The final goal would be development of a Raman portable fiber probe device for intraoperative optical biopsy, both to improve the surgical success rate and reduce surgical cost. [ABSTRACT FROM AUTHOR]

Published
2018
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