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1. The highest oxidation state observed in graphene-supported sub-nanometer iron oxide clusters

Author

Deborah Perco, Federico Loi, Luca Bignardi, Luca Sbuelz, Paolo Lacovig, Ezequiel Tosi, Silvano Lizzit, Aras Kartouzian, Ueli Heiz, and Alessandro Baraldi

Subjects
Materials Chemistry, Environmental Chemistry, General Chemistry, Biochemistry
Abstract

Size-selected iron oxide nanoclusters are outstanding candidates for technological-oriented applications due to their high efficiency-to-cost ratio. However, despite many theoretical studies, experimental works on their oxidation mechanism are still limited to gas-phase clusters. Herein we investigate the oxidation of graphene-supported size-selected Fen clusters by means of high-resolution X-ray Photoelectron Spectroscopy. We show a dependency of the core electron Fe 2p3/2 binding energy of metallic and oxidized clusters on the cluster size. Binding energies are also linked to chemical reactivity through the asymmetry parameter which is related to electron density of states at the Fermi energy. Upon oxidation, iron atoms in clusters reach the oxidation state Fe(II) and the absence of other oxidation states indicates a Fe-to-O ratio close to 1:1, in agreement with previous theoretical calculations and gas-phase experiments. Such knowledge can provide a basis for a better understanding of the behavior of iron oxide nanoclusters as supported catalysts.

Published
2023

2. Casemix, management, and mortality of patients receiving emergency neurosurgery for traumatic brain injury in the Global Neurotrauma Outcomes Study: a prospective observational cohort study

Author

David Clark, Alexis Joannides, Amos Olufemi Adeleye, Abdul Hafid Bajamal, Tom Bashford, Hagos Biluts, Karol Budohoski, Ari Ercole, Rocío Fernández-Méndez, Anthony Figaji, Deepak Kumar Gupta, Roger Härtl, Corrado Iaccarino, Tariq Khan, Tsegazeab Laeke, Andrés Rubiano, Hamisi K Shabani, Kachinga Sichizya, Manoj Tewari, Abenezer Tirsit, Myat Thu, Manjul Tripathi, Rikin Trivedi, Bhagavatula Indira Devi, Franco Servadei, David Menon, Angelos Kolias, Peter Hutchinson, Ghayur Abbas, Omar Ibrahim Abdallah, Ahmed Abdel-Lateef, Khalif Abdifatah, Awfa Abdullateef, Ruvini Abeygunaratne, Mostafa Aboellil, Abass Adam, Robert Adams, Amos Adeleye, Augustine Adeolu, Novan Krisno Adji, Nur Afianti, Sudarsan Agarwal, Ifeanyi Kene Aghadi, Paúl Martín Méndez Aguilar, Syeda Rida Ahmad, Daniyal Ahmed, Nafees Ahmed, Haider Aizaz, Yunus Kuntawi Aji, Alex Alamri, Augusto Jacinto Mussindo Alberto, Luis Alcocer Alcocer, Lesly Gonzales Alfaro, Amro Al-Habib, Ahmad Alhourani, Syed Muhammad Rafay Ali, Fahad Alkherayf, Ahmed AlMenabbawy, Aliyah Alshareef, Muhammad Adil s/o Aminullah, Madeha Amjad, Robson Luis Oliveira de Amorim, Sathiaprabhu Anbazhagan, Almir Andrade, Waleed Antar, Theophilus T.K. Anyomih, Salah Aoun, Tedy Apriawan, Daniele Armocida, Paul Arnold, Miguel Arraez, Temesgen Assefa, Andres Asser, S.P. Athiththan, Deepal Attanayake, Maung Maung Aung, Allan Avi, Victor Enrique Antolinez Ayala, Mohammed Azab, Gaousul Azam, Mohd Azharuddin, Olukemi Badejo, Mohamed Badran, Azam Ali Baig, Rehman Ali Baig, Ankur Bajaj, Paul Baker, Renu Bala, Artur Balasa, Ross Balchin, James Balogun, Vin Shen Ban, Bharath Kumar Reddy Bandi, Soham Bandyopadhyay, Matthew Bank, Ernest Barthelemy, Mohammed Talha Bashir, Luciano Silveira Basso, Surajit Basu, Auricelio Batista, Marlies Bauer, Devi Bavishi, Abi Beane, Shmuel Bejell, Anteneh Belachew, Antonio Belli, Amani Belouaer, Najia El Abbadi Bendahane, Okanga Benjamin, Youssef Benslimane, Chaymae Benyaiche, Claudio Bernucci, Luigi Valentino Berra, Arnold Bhebe, Alexios Bimpis, Diana Blanaru, Jean Claude Bonfim, Luis A B Borba, Alp Ozgun Borcek, Erika Borotto, Ahmad Elmabri Mohammad Bouhuwaish, Facundo Bourilhon, Gioia Brachini, Joshua Breedon, Maximilian Broger, Giacoma Maria Floriana Brunetto, Placido Bruzzaniti, Natalia Budohoska, Hira Burhan, Maximiliano Luis Calatroni, Catherine Camargo, Pier Francesco Cappai, Salvatore Massimiliano Cardali, Ana M Castaño-Leon, David Cederberg, Mikel Celaya, Marco Cenzato, Lakshmi Madhavi Challa, Dhanny Charest, Bipin Chaurasia, Rabah Chenna, Iype Cherian, Juliana Henry Ching'o, Tejas Chotai, Ajay Choudhary, Nabeel Choudhary, Florence Choumin, Tomislav Cigic, Juan Ciro, Carlo Conti, Antônio Carlos de Souza Corrêa, Giulia Cossu, Maíra Piani Couto, Aurora Cruz, Divya D'Silva, Giuseppe Antonio D'Aliberti, Lamin Dampha, Roy Thomas Daniel, Andrew Dapaah, Aneela Darbar, Gabriel Dascalu, Happy Amos Dauda, Owain Davies, Andrea Delgado-Babiano, Markus Dengl, Marko Despotovic, Indira Devi, Celeste Dias, Mohamed Dirar, Melina Dissanayake, Hananiah Djimbaye, Simon Dockrell, Ali Dolachee, Julija Dolgopolova, Muge Dolgun, Abdalrouf Dow, Davide Drusiani, Artjom Dugan, Dinh Tuan Duong, Trung Kien Duong, Tomasz Dziedzic, Ali Ebrahim, Nizar El Fatemi, Antonios El El Helou, Rachid El El Maaqili, Brahim El El Mostarchid, Abdessamad El El Ouahabi, Mohammad Elbaroody, Ahmed El-Fiki, Ahmed El-Garci, Nasser M.F. El-Ghandour, Muhammed Elhadi, Vanessa Elleder, Safa Elrais, Mohamed El-shazly, Mohamed Elshenawy, Hesham Elshitany, Omar El-Sobky, Marwa Emhamed, Basil Enicker, Onur Erdogan, Sebastian Ertl, Ignatius Esene, Omar Ocampo Espinosa, Tarig Fadalla, Mohammed Fadelalla, Rodrigo Moreira Faleiro, Nida Fatima, Charbel Fawaz, Assefa Fentaw, Carla Eiriz Fernandez, Ana Ferreira, Francesco Ferri, Tony Figaji, Emerson L B Filho, Loic Fin, Benjamin Fisher, Fitra Fitra, Alexis Palpan Flores, Ioan Stefan Florian, Vincenzo Fontana, Lauren Ford, Daniel Fountain, Jose Maria Roda Frade, Antonio Fratto, Christian Freyschlag, Aranzazu Sánchez Gabin, Clare Gallagher, Mario Ganau, Maria Luisa Gandia-Gonzalez, Andoni Garcia, Borja Hernandez Garcia, Sanjeewa Garusinghe, Biniam Gebreegziabher, Adrian Gelb, Jerome St George, Antonino Francesco Germanò, Ilaria Ghetti, Prajwal Ghimire, Alessandro Giammarusti, Jose Luis Gil, Panagiota Gkolia, Yoseph Godebo, Prakash Rao Gollapudi, Jagos Golubovic, Jeremias Fernando Gomes, Javier Gonzales, William Gormley, Alexander Gots, Giulia Letizia Gribaudi, Dylan Griswold, Paolo Gritti, Ruan Grobler, Rudy Gunawan, Birhanu Hailemichael, Elmehdi Hakkou, Mark Haley, Alhafidz Hamdan, Ali Hammed, Waeel Hamouda, Nurul Ashikin Hamzah, Nyein Latt Han, Sahin Hanalioglu, Rashan Haniffa, Martin Hanko, John Hanrahan, Timothy Hardcastle, Fahd Derkaoui Hassani, Volkmar Heidecke, Eirik Helseth, Miguel Ángel Hernández-Hernández, Zachary Hickman, Le Minh Chau Hoang, Alexa Hollinger, Lenka Horakova, Kismet Hossain-Ibrahim, Boru Hou, Samer Hoz, Janine Hsu, Martin Hunn, Madiha Hussain, Giorgia Iacopino, Mylena Miki Lopes Ideta, Irene Iglesias, Ali Ilunga, Nafiz Imtiaz, Rafiza Islam, Serge Ivashchenko, Karim Izirouel, Mohamed Sobhi Jabal, Soubhi Jabal, John Nute Jabang, Aimun Jamjoom, Irfan Jan, Landing BM Jarju, Saad Javed, Bojan Jelaca, Sukhdeep Singh Jhawar, Ting Ting Jiang, Fernando Jimenez, Jorge Jiris, Ron Jithoo, Walt Johnson, Mathew Joseph, Rameshman Joshi, Eija Junttila, Mubashir Jusabani, Stephen Akau Kache, Satyavara Prasad Kadali, Gabriela F Kalkmann, Usman Kamboh, Hitham Kandel, Ahmet Kamil Karakus, Mengistu Kassa, Ari Katila, Yoko Kato, Martin Keba, Kristy Kehoe, Huseyin Hayri Kertmen, Soha Khafaji, Monty Khajanchi, Mohammed Khan, Muhammad Mukhtar Khan, Sohail Daud Khan, Ahtesham Khizar, Amir Khriesh, Sara Kierońska, Paul Kisanga, Boniface Kivevele, Kacper Koczyk, Anna-Lucia Koerling, Danielle Koffenberger, Kennet Kõiv, Leho Kõiv, Branislav Kolarovszki, Marton König, Dilek Könü-Leblebicioglu, Santhoshi Devi Koppala, Tommi Korhonen, Boguslaw Kostkiewicz, Kacper Kostyra, Srinivas Kotakadira, Arjun Reddy Kotha, Madhu Narayana Rao Kottakki, Nenad Krajcinovic, Michal Krakowiak, Andreas Kramer, Selvamuthukumaran Krishnamoorthy, Ashok Kumar, Pankaj Kumar, Pradhumna Kumar, Nilaksha Kumarasinghe, Gowtham Kuncha, Raja K. Kutty, Ghazwan Lafta, Simon Lammy, Pierfrancesco Lapolla, Jacopo Lardani, Nebojsa Lasica, Giancarlo Lastrucci, Yoann Launey, Laura Lavalle, Tim Lawrence, Albert Lazaro, Vitalii Lebed, Ville Leinonen, Lawrence Lemeri, Leon Levi, Jia Yi Lim, Xiao Yi Lim, Jorge Linares-Torres, Laura Lippa, Lurdes Lisboa, Jinfang Liu, Ziyuan Liu, William B Lo, Jan Lodin, Federico Loi, Daniella Londono, Pedro Antonio Gomez Lopez, Cristina Barceló López, Madeleine De Lotbiniere-Bassett, Rihards Lulens, Facundo Hector Luna, Teemu Luoto, Vijaya Sekhar M.V., Ndyebo Mabovula, Matthew MacAllister, Alcina Americo Macie, Rodolfo Maduri, Moufid Mahfoud, Ashraf Mahmood, Fathia Mahmoud, Dominic Mahoney, Wissam Makhlouf, George Malcolm, Adefolarin Malomo, Toluyemi Malomo, Manoranjitha Kumari Mani, Tomás Gazzinelli Marçal, Jacopo Marchello, Nicolò Marchesini, Franz Marhold, Niklas Marklund, Rubén Martín-Láez, Vickneswaran Mathaneswaran, David José Mato-Mañas, Helen Maye, Aaron Lawson McLean, Catherine McMahon, Saniya Mediratta, Mehreen Mehboob, Alisson Meneses, Nesrine Mentri, Hagos Mersha, Ana Milena Mesa, Cristy Meyer, Christopher Millward, Salomao Amone Mimbir, Andrea Mingoli, Parashruram Mishra, Tejesh Mishra, Basant Misra, Siddharth Mittal, Imran Mohammed, Ioana Moldovan, Masechaba Molefe, Alexis Moles, Preston Moodley, Mario Augusto Narváez Morales, Lucy Morgan, German Del Castillo Morillo, Wahab Moustafa, Nikolaos Moustakis, Salma Mrichi, Satya Shiva Munjal, Abdul-Jalilu Mohammed Muntaka, Denver Naicker, Paulo E H Nakashima, Pratap Kumar Nandigama, Samantha Nash, Ionut Negoi, Valetina Negoita, Samundra Neupane, Manh Hung Nguyen, Fajar Herbowo Niantiarno, Abbi Noble, Mohd Arman Muhamad Nor, Blazej Nowak, Andrei Oancea, Frazer O'Brien, Oghenekevwe Okere, Sandra Olaya, Leandro Oliveira, Louise Makarem Oliveira, Fatma Omar, Okezi Ononeme, René Opšenák, Simone Orlandini, Alrobah Osama, Dorcas Osei-Poku, Haytham Osman, Alvaro Otero, Malte Ottenhausen, Shuli Otzri, Oumaima Outani, Emmanuel Abem Owusu, Kevin Owusu-Agyemang, Ahmad Ozair, Baris Ozoner, Elli Paal, Mauro Sérgio Paiva, Wellingson Paiva, Sharad Pandey, Gastone Pansini, Luigi Pansini, Tobias Pantel, Nikolaos Pantelas, Konstantinos Papadopoulos, Vladimir Papic, Kee Park, Nick Park, Eric Homero Albuquerque Paschoal, Mylla Christie de Oliveira Paschoalino, Rajesh Pathi, Anilkumar Peethambaran, Thiago Andrade Pereira, Irene Panero Perez, Claudio José Piqueras Pérez, Tamilanandh Periyasamy, Stefano Peron, Michael Phillips, Sofía Sotos Picazo, Ertugrul Pinar, Daniel Pinggera, Rory Piper, Pathmanesan Pirakash, Branko Popadic, Jussi P. Posti, Rajmohan Bhanu Prabhakar, Sivanesalingam Pradeepan, Manjunath Prasad, Paola Calvachi Prieto, Ron Prince, Andrea Prontera, Eva Provaznikova, Danilo Quadros, Nezly Jadid Romero Quintero, Mahmood Qureshi, Happiness Rabiel, Gabriel Rada, Sivagnanam Ragavan, Jueria Rahman, Omar Ramadhan, Padma Ramaswamy, Sakina Rashid, Jagath Rathugamage, Tõnu Rätsep, Minna Rauhala, Asif Raza, Naga Raju Reddycherla, Linus Reen, Mohamed Refaat, Luca Regli, Haijun Ren, Antonio Ria, Thales Francisco Ribeiro, Alessandro Ricci, Romana Richterová, Florian Ringel, Faith Robertson, Catarina Mayrink Siqueira Cabral Rocha, Juvenal de Souza Rogério, Adan Anibal Romano, Sally Rothemeyer, Gail Rousseau Gail Rousseau, Ranette Roza, Kevin David Farelo Rueda, Raiza Ruiz, Malin Rundgren, Radoslaw Rzeplinski, Raj S.Chandran, Ramesh Andi Sadayandi, William Sage, André Norbert Josef Sagerer, Mustafa Sakar, Mohcine Salami, Danjuma Sale, Youssuf Saleh, Cristina Sánchez-Viguera, Saning'o Sandila, Ahmet Metin Sanli, Laura Santi, Antonio Santoro, Aieska Kellen Dantas Dos Santos, Samir Cezimbra dos Santos, Borja Sanz, Shabal Sapkota, Gopalakrishnan Sasidharan, Ibrahim Sasillo, Rajeev Satoskar, Ali Caner Sayar, Vignesh Sayee, Florian Scheichel, Felipe Lourenzon Schiavo, Alexander Schupper, Andreas Schwarz, Teresa Scott, Esther Seeberger, Claudionor Nogueira Costa Segundo, Anwar Sadat Seidu, Antonio Selfa, Nazan Has Selmi, Claudiya Selvarajah, Necmiye Şengel, Martin Seule, Luiz Severo, Purva Shah, Muhammad Shahzad, Thobekile Shangase, Mayur Sharma, Ehab Shiban, Emnet Shimber, Temitayo Shokunbi, Kaynat Siddiqui, Emily Sieg, Martin Siegemund, Shahidur Rahman Sikder, Ana Cristina Veiga Silva, Ana Silva, Pedro Alberto Silva, Deepinder Singh, Carly Skadden, Josef Skola, Eirini Skouteli, Pawel Słoniewski, Brandon Smith, Guirish Solanki, Davi Fontoura Solla, Davi Solla, Ozcan Sonmez, Müge Sönmez, Wai Cheong Soon, Roberto Stefini, Martin Nikolaus Stienen, Bogdan Stoica, Matthew Stovell, Maria Natalia Suarez, Alaa Sulaiman, Mazin Suliman, Adi Sulistyanto, Şeniz Sulubulut, Sandra Sungailaite, Madlen Surbeck, Tomasz Szmuda, Graziano Taddei, Abraham Tadele, Ahmed Saleh Ahmed Taher, Riikka Takala, Krishna Murthy Talari, Bih Huei Tan, Leonardo Tariciotti, Murad Tarmohamed, Oumayma Taroua, Emiliano Tatti, Olli Tenovuo, Sami Tetri, Poojan Thakkar, Nqobile Thango, Satish Kumar Thatikonda, Tuomo Thesleff, Claudius Thomé, Owen Thornton, Shelly Timmons, Eva Ercilio Timoteo, Campbell Tingate, Souhil Tliba, Christos Tolias, Emma Toman, Ivan Torres, Luis Torres, Youness Touissi, Musa Touray, Maria Pia Tropeano, Georgios Tsermoulas, Christos Tsitsipanis, Mehmet Erhan Turkoglu, Özhan Merzuk Uçkun, Jamie Ullman, Gheorghe Ungureanu, Sarah Urasa, Obaid Ur-Rehman, Muhammed Uysal, Antonios Vakis, Egils Valeinis, Vaishali Valluru, Debby Vannoy, Pablo Vargas, Phillipos Varotsis, Rahul Varshney, Atul Vats, Damjan Veljanoski, Sara Venturini, Abhijit Verma, Clara Villa, Genaro Villa, Sofia Villar, Erin Villard, Antonio Viruez, Stefanos Voglis, Petar Vulekovic, Saman Wadanamby, Katherine Wagner, Rebecca Walshe, Jan Walter, Marriam Waseem, Tony Whitworth, Ruwani Wijeyekoon, Adam Williams, Mark Wilson, Sein Win, Achmad Wahib Wahju Winarso, Abraão Wagner Pessoa Ximenes, Anurag Yadav, Dipak Yadav, Kamal Makram Yakoub, Ali Yalcinkaya, Guizhong Yan, Eesha Yaqoob, Carlos Yepes, Ayfer Nazmiye Yılmaz, Betelehem Yishak, Farhat Basheer Yousuf, Muhammad Zamzuri Zahari, Hussein Zakaria, Diego Zambonin, Luca Zavatto, Bassel Zebian, Anna Maria Zeitlberger, Furong Zhang, Fengwei Zheng, and Michal Ziga

Subjects
casemix, management, mortality, emergency neurosurgery, traumatic brain injury, prospective observational cohort study, Neurology (clinical)
Abstract

© 2022 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY 4.0 licenseBackground: Traumatic brain injury (TBI) is increasingly recognised as being responsible for a substantial proportion of the global burden of disease. Neurosurgical interventions are an important aspect of care for patients with TBI, but there is little epidemiological data available on this patient population. We aimed to characterise differences in casemix, management, and mortality of patients receiving emergency neurosurgery for TBI across different levels of human development. Methods: We did a prospective observational cohort study of consecutive patients with TBI undergoing emergency neurosurgery, in a convenience sample of hospitals identified by open invitation, through international and regional scientific societies and meetings, individual contacts, and social media. Patients receiving emergency neurosurgery for TBI in each hospital's 30-day study period were all eligible for inclusion, with the exception of patients undergoing insertion of an intracranial pressure monitor only, ventriculostomy placement only, or a procedure for drainage of a chronic subdural haematoma. The primary outcome was mortality at 14 days postoperatively (or last point of observation if the patient was discharged before this time point). Countries were stratified according to their Human Development Index (HDI)—a composite of life expectancy, education, and income measures—into very high HDI, high HDI, medium HDI, and low HDI tiers. Mixed effects logistic regression was used to examine the effect of HDI on mortality while accounting for and quantifying between-hospital and between-country variation. Findings: Our study included 1635 records from 159 hospitals in 57 countries, collected between Nov 1, 2018, and Jan 31, 2020. 328 (20%) records were from countries in the very high HDI tier, 539 (33%) from countries in the high HDI tier, 614 (38%) from countries in the medium HDI tier, and 154 (9%) from countries in the low HDI tier. The median age was 35 years (IQR 24–51), with the oldest patients in the very high HDI tier (median 54 years, IQR 34–69) and the youngest in the low HDI tier (median 28 years, IQR 20–38). The most common procedures were elevation of a depressed skull fracture in the low HDI tier (69 [45%]), evacuation of a supratentorial extradural haematoma in the medium HDI tier (189 [31%]) and high HDI tier (173 [32%]), and evacuation of a supratentorial acute subdural haematoma in the very high HDI tier (155 [47%]). Median time from injury to surgery was 13 h (IQR 6–32). Overall mortality was 18% (299 of 1635). After adjustment for casemix, the odds of mortality were greater in the medium HDI tier (odds ratio [OR] 2·84, 95% CI 1·55–5·2) and high HDI tier (2·26, 1·23–4·15), but not the low HDI tier (1·66, 0·61–4·46), relative to the very high HDI tier. There was significant between-hospital variation in mortality (median OR 2·04, 95% CI 1·17–2·49). Interpretation: Patients receiving emergency neurosurgery for TBI differed considerably in their admission characteristics and management across human development settings. Level of human development was associated with mortality. Substantial opportunities to improve care globally were identified, including reducing delays to surgery. Between-hospital variation in mortality suggests changes at an institutional level could influence outcome and comparative effectiveness research could identify best practices. Funding: National Institute for Health Research Global Health Research Group.

Published
2022

3. Oxidation at the sub-nanoscale: oxygen adsorption on graphene-supported size-selected Ag clusters

Author

Federico Loi, Monica Pozzo, Luca Sbuelz, Luca Bignardi, Paolo Lacovig, Ezequiel Tosi, Silvano Lizzit, Aras Kartouzian, Ueli Heiz, Dario Alfè, Alessandro Baraldi, Loi, F, Pozzo, M, Sbuelz, L, Bignardi, L, Lacovig, P, Tosi, E, Lizzit, S, Kartouzian, A, Heiz, U, Alfe, D, Baraldi, A, Loi, F., Pozzo, M., Sbuelz, L., Bignardi, L., Lacovig, P., Tosi, E., Lizzit, S., Kartouzian, A., Heiz, U., Alfe, Dario, and Baraldi, A.

Subjects
Silver-oxide, Silver, AgO, oxidation, Renewable Energy, Sustainability and the Environment, nanoclusters, nanocluster, x-ray photoelectron spectroscopy, General Materials Science, Ag, General Chemistry
Abstract

The evolution of the aggregation of condensed matter from single atoms to three-dimensional structures represents an important topic in nanoscience, since it contains essential information to achieve tailor- made growth of nanostructured materials. Such an issue is particularly important in the case of the formation of nano-oxides, which have strong potentialities in heterogeneous catalysis reactions. Herein, we show that a low-nuclearity graphene supported Ag cluster (formed by 11 atoms) shows a local AgO4 configuration, spatial charge distribution and two oxidation states that are similar to those of bulk AgO. This result indicates that bulk oxide conformations can start to develop already for extremely small atomic aggregates (

Published
2022

4. Breakdown of the correlation between oxidation states and core electron binding energies at the sub-nanoscale

Author

Federico Loi, Monica Pozzo, Luca Sbuelz, Luca Bignardi, Paolo Lacovig, Ezequiel Tosi, Silvano Lizzit, Aras Kartouzian, Ulrich Heiz, Rosanna Larciprete, Dario Alf è, Alessandro Baraldi, Loi, F., Pozzo, M., Sbuelz, L., Bignardi, L., Lacovig, P., Tosi, E., Lizzit, S., Kartouzian, A., Heiz, U., Larciprete, R., Alfe, Dario, and Baraldi, A.

Subjects
General Physics and Astronomy, Surfaces and Interfaces, General Chemistry, Condensed Matter Physics, Surfaces, Coatings and Films
Abstract

X-ray photoelectron spectroscopy is a powerful analytical tool to fingerprint the atomic oxidation state. However, the well-established trend that is found for bulk, ultra-thin films and surface oxides, which is usually characterized by an incremental binding energy shift upon increasing oxidation state, may not apply at the sub-nanoscale where reduced dimensionality and quantum size effects play a relevant role. Here we investigate through a combined experimental and theoretical approach the oxidation of size-selected Ag7 and Ag11 clusters supported on graphene, revealing an anomalous Ag 3d5/2 core level shift trend upon increasing O coverage. We show that the negative core level shift trend typical of Ag reverts back in the case of the highest Ag(III) oxidation state, an effect that is due to the peculiar electronic structure of Ag nano-oxides. Our results highlight the great care needed to extend at the zero-dimensional scale the knowledge acquired for the spectral interpretation of 3D and 2D materials.

Published
2023

5. Carotid artery imaging: The study of intra-plaque vascularization and hemorrhage in the era of the 'vulnerable' plaque

Author

Jasjit S. Suri, Roberto Sanfilippo, Pierleone Lucatelli, Michele Porcu, Bruce A. Wasserman, Nicoletta Anzalone, Federico Loi, Vasileios Rafailidis, Roberto Montisci, Luca Saba, Michele Anzidei, Porcu, Michele, Anzidei, Michele, Suri, Jasjit S, A Wasserman, Bruce, Anzalone, Nicoletta, Lucatelli, Pierleone, Loi, Federico, Montisci, Roberto, Sanfilippo, Roberto, Rafailidis, Vasileio, and Saba, Luca

Subjects
medicine.medical_specialty, Carotid arteries, Hemorrhage, Computed tomography, medicine.disease_cause, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, medicine, Humans, Carotid Stenosis, Radiology, Nuclear Medicine and imaging, Ultrasonography, Radiological and Ultrasound Technology, medicine.diagnostic_test, business.industry, Ultrasound, Magnetic resonance imaging, Magnetic Resonance Imaging, Vulnerable plaque, Ischemic stroke, Neurology (clinical), Radiology, Tomography, X-Ray Computed, business, 030217 neurology & neurosurgery
Abstract

Intraplaque hemorrhage (IPH) is one of the main factors involved in atherosclerotic plaque (AP) instability. Its recognition is crucial for the correct staging and management of patients with carotid artery plaques to limit ischemic stroke. Imaging plays a crucial role in identifying IPH, even if the great variability of intraplaque vascularization and the limitations of our current imaging technologies make it difficult. The intent of this review is to give a general overview of the main features of intraplaque vascularization and IPH on Ultrasound (US), Computed Tomography (CT), Magnetic Resonance (MR) and Nuclear Medicine, and a brief description on the future prospectives.

Published
2020

6. Giant magneto-electric coupling in 100 nm thick Co capped by ZnO nanorods

Author

R. Ciprian, Federico Loi, Giovanni Vinai, F. Cugini, Antonio Caretta, B. Gobaut, Piero Torelli, Luca Capasso, Regina Ciancio, Barbara Ressel, Barbara Casarin, Fulvio Parmigiani, Massimo Solzi, Marco Malvestuto, Vinai, Giovanni, Ressel, Barbara, Torelli, Piero, Loi, Federico, Gobaut, Benoit, Ciancio, Regina, Casarin, Barbara, Caretta, Antonio, Capasso, Luca, Parmigiani, Fulvio, Cugini, Francesco, Solzi, Massimo, Malvestuto, Marco, and Ciprian, Roberta

Subjects
Materials science, Magnetic moment, business.industry, 02 engineering and technology, Coercivity, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, Piezoelectricity, multiferroic heterostructure, Condensed Matter::Materials Science, magnetism, 0103 physical sciences, Optoelectronics, General Materials Science, Nanorod, Crystallite, Materials Science (all), 010306 general physics, 0210 nano-technology, Spectroscopy, Absorption (electromagnetic radiation), business
Abstract

Here we report a giant, completely reversible magneto-electric coupling of 100 nm polycrystalline Co layer in contact with ZnO nanorods. When the sample is under an applied bias of ±2 V, the Co magnetic coercivity is reduced by a factor 5 from the un-poled case, with additionally a reduction of total magnetic moment in Co. Taking into account the chemical properties of ZnO nanorods measured by X-rays absorption near edge spectroscopy under bias, we conclude that these macroscopic effects on the magnetic response of the Co layer are due to the microstructure and the strong strain-driven magneto-electric coupling induced by the ZnO nanorods, whose nanostructuration maximizes the piezoelectric response under bias.

Published
2018

7. Gender differences in motor and non-motor symptoms among Sardinian patients with Parkinson's disease

Author

Maria Giovanna Marrosu, Gianni Orofino, Francesco Marrosu, Federica Carla Ibba, Federico Loi, Paolo Solla, Antonino Cannas, and M. Corona

Subjects
Male, medicine.medical_specialty, Parkinson's disease, Hypokinesia, Disease, Motor Activity, Severity of Illness Index, Antiparkinson Agents, Internal medicine, Tremor, Severity of illness, Prevalence, medicine, Humans, Psychiatry, Depression (differential diagnoses), Aged, Depressive Disorder, Sex Characteristics, Mood Disorders, Parkinsonism, Parkinson Disease, Middle Aged, Urination Disorders, medicine.disease, Anxiety Disorders, Muscle Rigidity, Sexual Dysfunction, Physiological, Sleep Disorders, Intrinsic, Sexual dysfunction, Italy, Psychotic Disorders, Neurology, Anxiety, Female, Neurology (clinical), Symptom Assessment, medicine.symptom, Cognition Disorders, Psychology, Sex characteristics
Abstract

Parkinson's disease (PD) occurs more frequently in men than in women and a higher risk for PD development in males compared with females has been hypothesized, suggesting gender may be a significant factor in the development and progression of parkinsonism. To date, gender differences in non-motor symptoms are under-reported.To assess gender differences in motor and non-motor symptoms among Sardinian PD patients.One hundred fifty-six (91 male and 65 female) consecutive Sardinian PD outpatients were included in this analysis. Modified Hoehn and Yahr scale and UPDRS were used to assess motor symptoms, while non-motor disturbances were evaluated with the non-motor symptoms scale (NMSS). Presence of depression, anxiety and other iatrogenic behavioral disorders was also investigated. In order to determine how gender differences could be specific to PD, 132 age-matched normal controls were assessed with the NMSS.Women were more likely than men to present with tremor as initial symptom (p.025) and worse UPDRS instability score (p.02). NMSS score in females was significantly higher than that in males (p.018). A significantly higher severity in cardiovascular (p0.002), sleep/fatigue (p.018) and mood/apathy (p.001) domains was observed in female PD patients, while the sexual dysfunction domain was reported with a significantly higher score in male patients (p.017). Fatigue (p.03), lack of motivation (p.015) and sadness (p.009) were observed significantly more frequent in females, while altered interest in sex was noted as more common in males (p.001). Frequency of depression (p.011) and anxiety (p.001) was significantly higher in females, while male patients had increased frequency of compulsive sexual behaviors (p.05). There was a significantly higher frequency of non-motor symptoms in eight domains in both male and female PD patients compared with controls (p.001, for all comparisons, with the exception of urinary disturbances in females: p.004). Only sexual dysfunctions were not significantly higher in male and female PD patients compared with controls.The present study highlights the role of gender differences associated with the occurrence of motor and non-motor disorders and our findings indicate that spectrum and severity of non-motor symptoms may present with different gender distribution in PD patients, suggesting a possible sex-related effect.

Published
2012

8. MOKE setup exploiting a nematic liquid crystal modulator

Author

Marco Malvestuto, Antonio Caretta, E Busetto, Valentina Bonanni, Massimo Solzi, R. Ciprian, Barbara Casarin, and Federico Loi

Subjects
010302 applied physics, Liquid crystal devices, Materials science, Kerr effect, business.industry, Physics::Optics, 02 engineering and technology, 021001 nanoscience & nanotechnology, Polarization (waves), 01 natural sciences, Ray, Chopper, Optical modulator, Liquid crystal, 0103 physical sciences, Optoelectronics, 0210 nano-technology, business, Instrumentation
Abstract

Here we report on the magneto-optical Kerr effect employing a nematic liquid crystal (LC) device as an optical modulator. This device allows performing intensity, phase, and polarization modulated measurements with a huge signal-to-noise ratio when compared to those obtained by means of an opto-mechanical chopper and a photo-elastic modulator. The results demonstrate that the optimal performance is achieved modulating the polarization state of the incident light by means of the LCs. © 2018 Author(s).

Published
2018

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