39 results on '"Monni N"'
Search Results
2. Single axis FOG aided attitude estimation algorithm for mobile robots
- Author
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Allotta, B., Costanzi, R., Fanelli, F., Monni, N., and Ridolfi, A.
- Published
- 2015
- Full Text
- View/download PDF
3. Typhoon at CommsNet13: Experimental experience on AUV navigation and localization
- Author
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Allotta, B., Bartolini, F., Caiti, A., Costanzi, R., Di Corato, F., Fenucci, D., Gelli, J., Guerrini, P., Monni, N., Munafò, A., Natalini, M., Pugi, L., Ridolfi, A., and Potter, J.R.
- Published
- 2015
- Full Text
- View/download PDF
4. Typhoon at CommsNet 2013: experimental experience on AUV navigation and localization
- Author
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Allotta, B., Bartolini, F., Caiti, A., Costanzi, R., Corato, F. Di, Fenucci, D., Gelli, J., Guerrini, P., Monni, N., Munafò, A., Natalini, M., Pugi, L., Ridolfi, A., and Potter, J.R.
- Published
- 2014
- Full Text
- View/download PDF
5. Redox-active benzoquinones as challenging ' : non-innocent ' linkers to construct 2D frameworks and nanostructures with tunable physical properties
- Author
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Monni, N., Angotzi, M. S., Oggianu, M., Sahadevan, Suchithra Ashoka, Mercuri, M. L., Monni, N., Angotzi, M. S., Oggianu, M., Sahadevan, Suchithra Ashoka, and Mercuri, M. L.
- Abstract
Exploiting redox activity in supramolecular frameworks such as coordination polymers, metal-organic frameworks and related nanostructures is of paramount importance both at the molecular level and for their technological applications, since the modulation of their redox states is an emerging strategy to enhance their physical properties. In the plethora of organic linkers, quinone derivatives are excellent redox-active ligands, widely used for various applications such as electrode materials, flow batteries, pseudocapacitors, etc. Benzoquinones undergo a one-electron reversible reduction to form a semiquinone radical species that can be further reduced to form hydroquinone. Remarkably, the quinoid ring can be functionalized with various functional groups making these systems excellent linkers to construct supramolecular frameworks as well as challenging platforms to tune the redox potential and therefore the stability of radical anions and electrochemical performances of the obtained materials. The recent advances on benzoquinone-based 2D CPs/MOFs and related nanostructures are reported, highlighting the extreme versatility of this class of redox-active linkers in tailoring the physical properties of the obtained materials. The current/future potential of these materials in electrochemical and technologically relevant applications will also be envisioned., QC 20221027
- Published
- 2022
- Full Text
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6. Identifying submarine slope instability from lava delta deformation: the COSMO-SKYMED and SENTINEL-1 contribution
- Author
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Di Traglia, F., Nolesini, T., Solari, L., Ciampalini, A., Frodella, W., Allotta, B., Rindi, A., Marini, L., Monni, N., Galardi, E., and Casagli, N.
- Subjects
submarine slope instability - Published
- 2018
7. An IMU and USBL-aided buoy for underwater localization
- Author
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Allotta, B., Bianchi, M., Fanelli, F., Gelli, J., Monni, N., Marco Pagliai, Palma, N., and Ridolfi, A.
- Subjects
Finite element method ,Enginyeria naval ,Marine engineering ,Underwater Robotics, Underwater Localization ,Robotics ,Engineering, Ocean ,Matemàtiques i estadística::Anàlisi numèrica::Mètodes en elements finits [Àrees temàtiques de la UPC] ,Engineering, Marine - Abstract
Autonomous underwater navigation remains, as of today, a challenging task. The marine environment limits the number of sensors available for precise localization, hence Au- tonomous Underwater Vehicles (AUVs) usually rely on inertial and velocity sensors to obtain an estimate of their position either through dead reckoning or by means of more sophisticated navigation filters (such as Kalman filters and its extensions [1]). On the other hand, acoustic localization makes possible the determination of a reliable vehicles pose estimate exploiting suit- able acoustic modems [3]; such estimate can even be integrated within the navigation filter of the vehicle in order to increase its accuracy. In this paper, the authors discuss the development and the performance of an Ultra-Short BaseLine (USBL)-aided buoy to improve the localization of underwater vehicles. At first, the components and the physical realization of the buoy will be discussed; then, the procedure to compute the position of the target will be analyzed. The following part of the paper will be focused on the development of a recursive state estimation algorithm to process the measurements computed by the buoy; specifically, Extended Kalman Filter [4] has been adopted to deal with the nonlinearities of the sensors housed on the buoy. A validation of the measurement filtering through experimental tests is also proposed.
- Published
- 2017
8. Towards a robust system helping underwater archaeologists through the acquisition of geo-referenced optical and acoustic data
- Author
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Allotta B., Costanzi R., Magrini M., Monni N., Moroni D., Pascali M. A., Reggiannini M., Ridolfi A., Tampucci M., and Salvetti O.
- Subjects
Interactive 3D Environments ,Underwater exploration ,Underwater archaelogist ,AUV ,Optical and acoustical data integration - Abstract
In the framework of the ARROWS project (September 2012 - August 2015), a venture funded by the European Commission, several modular Autonomous Underwater Vehicles (AUV) have been developed to the main purposes of mapping, diagnosing, cleaning, and securing underwater and coastal archaeological sites. These AUVs consist of modular mobile robots, designed and manufactured according to specific suggestions formulated by a pool of archaeologists featuring long-standing experience in the field of Underwater Cultural Heritage preservation. The vehicles are typically equipped with acoustic modems to communicate during the dive and with different payload devices to sense the environment. The selected sensors represent appealing choices to the oceanographic engineer since they provide complementary information about the surrounding environment. The main topics discussed in this paper concern (i) performing a systematic mapping of the marine seafloors, (ii) processing the output maps to detect and classify potential archaeological targets and finally (iii) developing dissemination systems with the purpose of creating virtual scenes as a photorealistic and informative representation of the surveyed underwater sites.
- Published
- 2015
9. Improved structure of sampler for underwater inspections
- Author
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Casagli, N., Mugnai, F., Pugi, L., Ridolfi, A., Costanzi, Riccardo, Monni, N., Bartolini, F., Natalini, M., Meroi, S., and Allotta, B.
- Published
- 2014
10. Method for determining the orientation of a submerged surface and apparatus that carries out this method
- Author
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Casagli, N., Mugnai, F., Pugi, L., Ridolfi, A., Costanzi, Riccardo, Vettori, G., Monni, N., Bartolini, F., Natalini, M., Meroi, S., Gigli, G., Brandani, L., and Allotta, B.
- Published
- 2014
11. FeelHippo: A low-cost autonomous underwater vehicle for subsea monitoring and inspection
- Author
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Ridolfi, A., primary, Costanzi, R., additional, Fanelli, F., additional, Monni, N., additional, Allotta, B., additional, Bianchi, S., additional, Conti, R., additional, Gelli, J., additional, Gori, L., additional, Pugi, L., additional, and Rindi, A., additional
- Published
- 2016
- Full Text
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12. The THESAURUS Project: AUV software design
- Author
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Allotta, B., Bartolini, F., Costanzi, Riccardo, Gelli, J., Monni, N., Natalini, M., Pugi, L., Ridolfi, A., and Vettori, G.
- Subjects
mechatronics ,Autonomous Underwater Vehicle ,Unmanned and Underwater Vehicles ,Marine Robotics ,Underwater Robotics - Published
- 2013
13. Struttura perfezionata di campionatore per ispezioni subacquee
- Author
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Casagli, N., Mugnai, F., Pugi, L., Ridolfi, A., Costanzi, Riccardo, Monni, N., Bartolini, F., Natalini, M., Meroi, S., and Allotta, B.
- Published
- 2013
14. Metodo per determinare l’orientazione di una superficie sommersa ed apparecchiatura che attua tale metodo
- Author
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Casagli, N., Mugnai, F., Pugi, L., Ridolfi, A., Costanzi, Riccardo, Vettori, G., Monni, N., Bartolini, F., Natalini, M., Meroi, S., Gigli, G., Brandani, L., and Allotta, B.
- Published
- 2013
15. The THESAURUS Project: design of the Tifone Autonomous Underwater Vehicle
- Author
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Allotta, B., Bartolini, F., Costanzi, Riccardo, Gelli, J., Monni, N., Pugi, L., Ridolfi, A., and Vettori, G.
- Subjects
Marine Robotics ,mechatronics ,Autonomous Underwater Vehicle - Published
- 2013
16. Preventing the capsize of industrial vehicles: experimental activities on a scaled low cost demonstrator
- Author
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Allotta, B., Costanzi, Riccardo, Monni, N., Natalini, M., Pugi, L., and Ridolfi, A.
- Subjects
meccanica applicata - Published
- 2013
17. The thesaurus project, a long range auv for extended exploration, surveillance and monitoring of archaeological sites
- Author
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Allotta, B., Pugi, L., Bartolini, F., Costanzi, R., Alessandro Ridolfi, Monni, N., Gelli, J., Vettori, G., Gualdesi, L., and Natalini, M.
- Subjects
Finite element method ,Underwater Robotics ,Mechatronics ,Propulsion Systems ,Marine engineering ,Autonomous Underwater Vehicle, Design Optimization, Swarm Control and Navigation ,Matemàtiques i estadística::Anàlisi numèrica::Mètodes en elements finits [Àrees temàtiques de la UPC] - Abstract
Within the framework of the Thesaurus project (Italian acronym for “TecnicHe per l’Esplorazione Sottomarina Archeologica mediante l’Utilizzo di Robot aUtonomi in Sciami”), the authors have developed a low cost, multirole Autonomous Underwater Vehicle, briefly called Tifone, whose design is the main topic of this paper. According to the expected performances and specifications, the vehicle has to maintain a good autonomy and efficiency, typical features of an AUV (Autonomous Underwater Vehicle), also maintaining high manoeuvrability and hovering capabilities, which are instead more common on ROVs (Remotely Operated Vehicles).Cooperative exploration and surveillance tasks involve the use of swarms of vehicles; the control, the mutual localization and communications among vehicles are fundamental tasks to be optimized. In particular, the optimization of costs with respect to benefits plays a critical role, considering that within the Thesaurus project a first fleet of three vehicles has to be developed. This work mainly deals with the different design phases of the vehicle and with the results of preliminary simulations and tests performed in the MDM laboratories, before the next lake (Roffia basin, between Pisa and Florence, Italy) and sea testing activities (Elba Island, Italy) that will be performed in spring and summer 2013.
- Published
- 2013
18. ScienzaLudica.it - Impariamo con il LEGO
- Author
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Quercioli F., Giacomelli G., Puccioni G.P., Tiribilli B., Vassalli M., Basso M., Barani E., Danti P., Finocchi I., Monni N., Mati F., Borchi A., and Niccolai R.
- Abstract
Riassunto. Sono più di dieci anni ormai che, con alterne vicende, giochiamo con il LEGO escogitando nuovi esperimenti per invogliare studenti dogni ordine e grado e semplici curiosi ad avvicinarsi alla scienza in modo divertente. Con il contributo del MIUR `e adesso disponibile un sito internet dedicato a questa attività di diffusione della cultura scientifica e tecnica attraverso il gioco. Abstract. More than ten years ago we started to play with LEGO to set up optical experiments for students of every age and amateur scientists. Since then, now and again, in spare time, we design new experiments. Now thanks to a financial support from MIUR a web site is available devoted to the diffusion of scientific and technical culture through ludic activity.
- Published
- 2009
19. Toward underwater acoustic-based simultaneous localization and mapping. Experimental results with the Typhoon AUV at CommsNet13 sea trial
- Author
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Di Corato, F., primary, Fenucci, D., additional, Caiti, A., additional, Costanzi, R., additional, Monni, N., additional, Pugi, L., additional, Ridolfi, A., additional, and Allotta, B., additional
- Published
- 2014
- Full Text
- View/download PDF
20. Thesaurus: AUV teams for archaeological search. Field results on acoustic communication and localization with the Typhoon
- Author
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Caiti, A., primary, Calabro, V., additional, Di Corato, F., additional, Fabbri, T., additional, Fenucci, D., additional, Munafo, A., additional, Allotta, B., additional, Bartolini, F., additional, Costanzi, R., additional, Gelli, J., additional, Monni, N., additional, Natalini, M., additional, Pugi, L., additional, and Ridolfi, A., additional
- Published
- 2014
- Full Text
- View/download PDF
21. Design and simulation of an autonomous underwater vehicle
- Author
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Allotta, B., Costanzi, R., Monni, N., Pugi, L., Alessandro Ridolfi, and Vettori, G.
- Subjects
path following ,underwater dynamic simulation ,underwater actuation design ,AUV, underwater actuation design, underwater dynamic simulation, path following ,AUV
22. Piecewise planar underwater mosaicing
- Author
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Fabio Pazzaglia, Carlo Colombo, Marco Fanfani, Benedetto Allotta, Niccolò Monni, Alessandro Ridolfi, Fabio Bellavia, Riccardo Costanzi, Bellavia F., Fanfani M., Pazzaglia F., Colombo C., Costanzi R., Monni N., Ridolfi A., and Allotta B.
- Subjects
Settore ING-INF/05 - Sistemi Di Elaborazione Delle Informazioni ,Sustainability and the Environment ,Settore INF/01 - Informatica ,business.industry ,Color correction ,Frame (networking) ,Remotely operated underwater vehicle ,Oceanography ,Renewable Energy, Sustainability and the Environment ,Color correction, Experimental evaluation, Image frames, Mosaic construction, Noisy trajectory, Re-projection, Reference frame, Video sequences ,Colors of noise ,Piecewise ,Computer vision ,Artificial intelligence ,Noise (video) ,Renewable Energy ,business ,Reference frame ,Homography (computer vision) ,Mathematics - Abstract
A commonly ignored problem in planar mosaics, yet often present in practice, is the selection of a reference homography reprojection frame where to attach the successive image frames of the mosaic. A bad choice for the reference frame can lead to severe distortions in the mosaic and can degenerate in incorrect configurations after some sequential frame concatenations. This problem is accentuated in uncontrolled underwater acquisition setups as those provided by AUVs or ROVs due to both the noisy trajectory of the acquisition vehicle — with roll and pitch shakes — and to the non-flat nature of the seabed which tends to break the planarity assumption implicit in the mosaic construction. These scenarios can also introduce other undesired effects, such as light variations between successive frames, scattering and attenuation, vignetting, flickering and noise. This paper proposes a novel mosaicing pipeline, also including a strategy to select the best reference homography in planar mosaics from video sequences which minimizes the distortions induced on each image by the mosaic homography itself. Moreover, a new non-linear color correction scheme is incorporated to handle strong color and luminosity variations among the mosaic frames. Experimental evaluation of the proposed method on real, challenging underwater video sequences shows the validity of the approach, providing clear and visually appealing mosaics.
- Published
- 2015
23. Design of a modular Autonomous Underwater Vehicle for archaeological investigations
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Steven Baines, Fabio Pazzaglia, Jonathan Gelli, Hilal Tolasa Gundogdu, Roberto Conti, Marco Reggiannini, Fabio Bartolini, Enis I. Tekdemir, Fabio Bellavia, Maria Antonietta Pascali, Luca Pugi, Carlo Colombo, Daniel Roig, Benedetto Allotta, Alessandro Ridolfi, Can Dede, Marco Natalini, Ovidio Salvetti, Marco Fanfani, Riccardo Costanzi, Davide Moroni, Niccolò Monni, Allotta, B, Baines, S, Bartolini, F, Bellavia, F, Colombo, C, Conti, R, Costanzi, R, Dede, C, Fanfani, M, Gelli, J, Gundogdu, HT, Monni, N, Moroni, D, Natalini, M, Pascali, MA, Pazzaglia, F, Pugi, L, Ridolfi, A, Reggiannini, M, Roig, D, Salvetti, O, and Tekdemir, EI
- Subjects
0209 industrial biotechnology ,Engineering ,Underwater acoustic positioning system ,Context (archaeology) ,02 engineering and technology ,Underwater robotics ,Image-based modelling and 3D reconstruction ,020901 industrial engineering & automation ,Autonomous Underwater Vehicle ,0202 electrical engineering, electronic engineering, information engineering ,Marine Robotics ,14. Life underwater ,Underwater ,Autonomous Underwater Vehicles ,Underwater Robotics ,Underwater Cultural Heritage ,Settore ING-INF/05 - Sistemi Di Elaborazione Delle Informazioni ,Archaeological Object Recognition ,Marine Robotic ,Settore INF/01 - Informatica ,business.industry ,iRobot Seaglider ,020208 electrical & electronic engineering ,Modular design ,Archaeology ,Intervention AUV ,Multi-sensor data analysis ,Robot ,business - Abstract
MARTA (MARine Tool for Archaeology) is a modular AUV (Autonomous Underwater Vehicle) designed and developed by the University of Florence in the framework of the ARROWS (ARchaeological RObot systems for the World's Seas) FP7 European project. The ARROWS project challenge is to provide the underwater archaeologists with technological tools for cost affordable campaigns: i.e. ARROWS adapts and develops low cost AUV technologies to significantly reduce the cost of archaeological operations, covering the full extent of an archaeological campaign (underwater mapping, diagnosis and cleaning tasks). The tools and methodologies developed within ARROWS comply with the "Annex" of the 2001 UNESCO Convention for the protection of Underwater Cultural Heritage (UCH). The system effectiveness and MARTA performance will be demonstrated in two scenarios, different as regards the environment and the historical context, the Mediterranean Sea (Egadi Islands) and the Baltic Sea.
- Published
- 2015
24. Tunable SIM properties in a family of 3D anilato-based lanthanide-MOFs.
- Author
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Monni N, Dey S, García-López V, Oggianu M, Baldoví JJ, Mercuri ML, Clemente-León M, and Coronado E
- Abstract
By reacting a 3,6-ditriazolyl-2,5-dihydroxybenzoquinone (H
2 trz2 An) anilato linker with LnIII ions (LnIII = Dy, Tb, Ho), two different series of polymorphs, formulated as [Ln2 (trz2 An)3 (H2 O)4 ]n ·10H2 O (DyIII , 1a; TbIII , 2a, HoIII , 3a) and [Ln2 (trz2 An)3 (H2 O)4 ]n ·7H2 O (DyIII , 1b, TbIII , 2b, HoIII , 3b) have been obtained. In these series the two DyIII -coordination networks (1a and 1b) and the TbIII -coordination polymer (2b) show a Single Ion Magnet (SIM) behavior. 1-3a MOFs show reversible structural flexibility upon removal of a coordinated water molecule from a distorted hexagonal 2D framework to a distorted 3,6-brickwall rectangular 3D structure in [Ln2 (trz2 An)3 (H2 O)2 ]n ·2H2 O (DyIII , 1a_des; TbIII , 2a_des, HoIII , 3a_des) involving shrinkage/expansion of the hexagonal-rectangular networks. Noteworthy, 2b represents the first example of a TbIII -anilate-based coordination polymer showing SIM behaviour to date and the best SIM properties within the polymorphs. Theoretical investigation via ab initio CASSCF calculations supports this behavior, since 2b shows less mixing between the mJ states of the ground state among all the studied complexes., Competing Interests: There are no conflicts to declare., (This journal is © the Partner Organisations.)- Published
- 2024
- Full Text
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25. Insights into Nd III to Yb III Energy Transfer and Its Implications in Luminescence Thermometry.
- Author
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Oggianu M, Mameli V, Hernández-Rodríguez MA, Monni N, Souto M, Brites CDS, Cannas C, Manna F, Quochi F, Cadoni E, Masciocchi N, Carneiro Neto AN, Carlos LD, and Mercuri ML
- Abstract
This work challenges the conventional approach of using Nd
III 4 F3/2 lifetime changes for evaluating the experimental NdIII → YbIII energy transfer rate and efficiency. Using near-infrared (NIR) emitting Nd:Yb mixed-metal coordination polymers (CPs), synthesized via solvent-free thermal grinding, we demonstrate that the NdIII [2 H11/2 →4 I15/2 ] → YbIII [2 F7/2 →2 F5/2 ] pathway, previously overlooked, dominates energy transfer due to superior energy resonance and J -level selection rule compatibility. This finding upends the conventional focus on the NdIII [4 F3/2 →4 I11/2 ] → YbIII [2 F7/2 →2 F5/2 ] transition pathway. We characterized Nd0.890 Yb0.110 (BTC)(H2 O)6 as a promising cryogenic NIR thermometry system and employed our novel energy transfer understanding to perform simulations, yielding theoretical thermometric parameters and sensitivities for diverse Nd:Yb ratios. Strikingly, experimental thermometric data closely matched the theoretical predictions, validating our revised model. This novel perspective on NdIII → YbIII energy transfer holds general applicability for the NdIII /YbIII pair, unveiling an important spectroscopic feature with broad implications for energy transfer-driven materials design., Competing Interests: The authors declare no competing financial interest., (© 2024 The Authors. Published by American Chemical Society.)- Published
- 2024
- Full Text
- View/download PDF
26. Reversible tuning of luminescence and magnetism in a structurally flexible erbium-anilato MOF.
- Author
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Monni N, Baldoví JJ, García-López V, Oggianu M, Cadoni E, Quochi F, Clemente-León M, Mercuri ML, and Coronado E
- Abstract
By combining 3,6- N -ditriazolyl-2,5-dihydroxy-1,4-benzoquinone (H
2 trz2 An) with NIR-emitting ErIII ions, two different 3D neutral polymorphic frameworks (1a and 1b), differing in the number of uncoordinated water molecules, formulated as [Er2 (trz2 An)3 (H2 O)4 ]n · x H2 O ( x = 10, a; x = 7, b), have been obtained. The structure of 1a shows layers with (6,3) topology forming six-membered rings with distorted hexagonal cavities along the bc plane. These 2D layers are interconnected through the N4 atoms of the two pendant arms of the trz2 An linkers, leading to a 3D framework, where neighboring layers are eclipsed along the a axis, with hexagonal channels filled with water molecules. In 1b, layers with (6,3) topology in the [101] plane are present, each ErIII ion being connected to three other ErIII ions through bis-bidentate trz2 An linkers, forming rectangular six-membered cavities. 1a and 1b are multifunctional materials showing coexistence of NIR emission and field-induced slow relaxation of the magnetization. Remarkably, 1a is a flexible MOF, showing a reversible structural phase transition involving shrinkage/expansion from a distorted hexagonal 2D framework to a distorted 3,6-brickwall rectangular 3D structure in [Er2 (trz2 An)3 (H2 O)2 ]n ·2H2 O (1a_des). This transition is triggered by a dehydration/hydration process under mild conditions (vacuum/heating to 360 K). The partially dehydrated compound shows a sizeable change in the emission properties and an improvement of the magnetic blocking temperature with respect to the hydrated compound, mainly related to the loss of one water coordination molecule. Theoretical calculations support the experimental findings, indicating that the slight improvement observed in the magnetic properties has its origin in the change of the ligand field around the ErIII ion due to the loss of a water molecule., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)- Published
- 2022
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27. Combined Experimental/Theoretical Study on the Luminescent Properties of Homoleptic/Heteroleptic Erbium(III) Anilate-Based 2D Coordination Polymers.
- Author
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Ashoka Sahadevan S, Manna F, Abhervé A, Oggianu M, Monni N, Mameli V, Marongiu D, Quochi F, Gendron F, Le Guennic B, Avarvari N, and Mercuri ML
- Abstract
The synthesis, structural and photophysical characterization, and theoretical studies on homo/heteroleptic neutral 2D-layered coordination polymers (CPs), obtained by combining the Er
III ion with chlorocyananilate (ClCNAn) and/or tetrafluoroterephthalate (F4 BDC) linkers, are herein reported. The structure of the heteroleptic ErIII -based CP, formulated as [Er2 (ClCNAn)2 (F4 BDC)(DMSO)6 ]n ( 1 ) is also reported. 1 crystallizes in the triclinic P 1̅ space group, and the structure consists of neutral 2D layers formed by ErIII ions linked through the two linkers oriented in such a way that the neighboring 2D layers are eclipsed along the a axis, leading to parallelogram-like cavities. Photophysical measurements highlight the prominent role of chlorocyananilate linkers as optical antennas toward lanthanide ions, while wave-function-theory analysis supports the experimental findings, providing evidence for the effect of ligand substitution on the luminescence properties of homo/heteroleptic 2D CPs.- Published
- 2021
- Full Text
- View/download PDF
28. Nanoscaled Metal-Organic Frameworks: Challenges Towards Biomedical Applications.
- Author
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Oggianu M, Mameli V, Monni N, Ashoka Sahadevan S, Sanna Angotzi M, Cannas C, and Mercuri ML
- Subjects
- Porosity, Metal-Organic Frameworks, Nanoparticles
- Abstract
Achieving metal-organic frameworks (MOFs) in the form of nanoparticles (NanoMOFs) represents a recent challenge due to the possibility to combine the intrinsic porosity of these materials with the nanometric dimension, a fundamental requirement for strategic biomedical applications. In this outlook we envision the current/future opportunities of the NanoMOFs in the field of biomedicine, with particular emphasis on (i) biocompatible MOFs composition; (ii) MOFs miniaturization and (iii) nanoMOFs applications.
- Published
- 2021
- Full Text
- View/download PDF
29. Silicon-based fluorescent platforms for copper(ii) detection in water.
- Author
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Oggianu M, Figus C, Ashoka-Sahadevan S, Monni N, Marongiu D, Saba M, Mura A, Bongiovanni G, Caltagirone C, Lippolis V, Cannas C, Cadoni E, Mercuri ML, and Quochi F
- Abstract
The potential of silicon-based fluorescent platforms for the detection of trace toxic metal ions was investigated in an aqueous environment. To this aim, silicon chips were first functionalized with amino groups, and fluorescein organic dyes, used as sensing molecules, were then covalently linked to the surface via formation of thiourea groups. The obtained hybrid heterostructures exhibited high sensitivity and selectivity towards copper(ii), a limit of detection compatible with the recommended upper limits for copper in drinking water, and good reversibility using a standard metal-chelating agent. The fluorophore-analyte interaction mechanism at the basis of the reported fluorescence quenching, as well as the potential of performance improvement, were also studied. The herein presented sensing architecture allows, in principle, tailoring of the selectivity towards other metal ions by proper fluorophore selection, and provides a favorable outlook for integration of fluorescent chemosensors with silicon photonics technology., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)
- Published
- 2021
- Full Text
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30. Magnetic Molecular Conductors Based on Bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) and the Tris(chlorocyananilato)ferrate(III) Complex.
- Author
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Sahadevan SA, Abhervé A, Monni N, Auban-Senzier P, Cano J, Lloret F, Julve M, Cui H, Kato R, Canadell E, Mercuri ML, and Avarvari N
- Abstract
Electrocrystallization of the bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) organic donor in the presence of the [Fe(ClCNAn)
3 ]3- tris(chlorocyananilato)ferrate(III) paramagnetic anion in different stoichiometric ratios and solvent mixtures afforded two different hybrid systems formulated as [BEDT-TTF]4 [Fe(ClCNAn)3 ]·3H2 O ( 1 ) and [BEDT-TTF]5 [Fe(ClCNAn)3 ]2 ·2CH3 CN ( 2 ) (An = anilato). Compounds 1 and 2 present unusual structures without the typical segregated organic and inorganic layers, where layers of 1 are formed by Λ and Δ enantiomers of the anionic paramagnetic complex together with mixed-valence BEDT-TTF tetramers, while layers of 2 are formed by Λ and Δ enantiomers of the paramagnetic complex together with dicationic BEDT-TTF dimers and monomers. Compounds 1 and 2 show semiconducting behaviors with room-temperature conductivities of ca. 6 × 10-3 S cm-1 (ambient pressure) and 1 × 10-3 S cm-1 (under applied pressure of 12.1 GPa), respectively, due to strong dimerization between the donors. Magnetic measurements performed on compound 1 indicate weak antiferromagnetic coupling between high-spin FeIII ( SFe = 5/2) and mixed-valence radical cation diyads (BEDT-TTF)2 + ( Srad = 1/2) mediated by the anilate ligands, together with an important Pauli paramagnetism typical for conducting systems.- Published
- 2019
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31. Dysprosium Chlorocyanoanilate-Based 2D-Layered Coordination Polymers.
- Author
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Sahadevan SA, Monni N, Abhervé A, Cosquer G, Oggianu M, Ennas G, Yamashita M, Avarvari N, and Mercuri ML
- Abstract
A series of two-dimensional (2D)-layered coordination polymers (CPs) based on the heterosubstituted anilate ligand ClCNAn
2- derived from 3-chloro-6-cyano-2,5-dihydroxybenzoquinone and DyIII are reported. By changes in the synthetic methods (layering technique, solvothermal or conventional one-pot reactions) and conditions (solvent, concentration, etc.), different types of 2D extended networks could be prepared and structurally characterized. Compounds 1 and 1' , two polymorphs with the formula [Dy2 (ClCNAn)3 (DMSO)6 ]n ·(H2 O)x [ x = 7 ( 1 ), 0 ( 1' )], were prepared by a conventional one-pot reaction and recrystallized at different concentrations. Compound 2 , formulated as [Dy2 (ClCNAn)3 (DMF)6 ]n , was prepared by a layering technique, while compound 3 , formulated as {(Me2 NH2 )2 [Dy2 (ClCNAn)4 (H2 O)2 ]·(DMF)2 ·(H2 O)5 }n , was obtained by a solvothermal method. Compounds 1 and 2 are neutral 2D CPs of the ClCNAn2- ligand and DyIII ions, while 3 presents 2D anionic layers of [Dy2 (ClCNAn)4 (H2 O)2 ]2- alternating with cationic layers of Me2 NH2 + ions. These compounds show very diverse networks, with compound 1 forming 2D (8,3) and (4,3) topology with eight- and four-membered rings with square cavities, 1' and 2 , respectively, a 2D (6,3) topology with six-membered rings (a rectangular cavity for 1' and a regular hexagonal cavity for 2 ), and 3 a 2D (4,4) topology with distorted square cavities. In this respect, 1 and 1' represent the first examples of polymorphism in the family of anilate-based CPs. Thermal analysis measurements (differential scanning calorimetry and thermogravimetry) show an exothermic polymorphic transformation from the kinetically stable 1' phase to the thermodynamically stable phase 1 . The magnetic behavior of 1 - 3 very likely indicates depopulation of the mJ levels, while the presence of weak antiferromagnetic coupling between the DyIII centers mediated by the anilate bridge cannot be excluded.- Published
- 2019
- Full Text
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32. Raman Spectroscopy as a Probe for Monitoring the Zinc Presence in Zn-Substituted Cobalt Ferrites.
- Author
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Monni N, Mameli V, Sahadevan SA, Gai S, Cannas C, and Mercuri ML
- Abstract
A Raman study on Zinc-substituted Cobalt ferrites, with different Zn(II) contents in each sample of formula: CoFe₂O₄ ( 1 ), Zn
0.30 Co0.70 Fe2.00 O₄ ( 2 ), Zn0.46 Co0.54 Fe2.02 O₄ ( 3 ), Zn0.53 Co0.47 Fe2.02 O₄ ( 4 ) is reported. These samples show the same crystallite size (∼6 nm), particle size (∼7 nm) and particle size distribution (∼20%) and they have been synthesized through heating up surfactant-assisted thermal decomposition of metalorganic precursors. The effect of Zn(II) substitution in the cationic distribution is investigated by using the known metal-oxygen vibrational modes in tetrahedral and octahedral sites. The presence of Zn(II) metal ion is determined through the band at 150 cm-1 (T2g (1) phonon mode), which is not present in the pure Co-ferrite, a blue-shift of the Eg vibrational mode depending on Zn(II)/Co(II) cationic distribution and a shoulder at ∼250 cm-1 , which appears when zinc enters in the structure, and a broadening and a red-shift in the A1g phonon mode is observed in Raman spectra of 2-4 samples. Interestingly the latter represents a potential key probe to monitor the Zn(II) presence in Zn-substituted Co-ferrites.- Published
- 2019
- Full Text
- View/download PDF
33. Conducting Anilate-Based Mixed-Valence Fe(II)Fe(III) Coordination Polymer: Small-Polaron Hopping Model for Oxalate-Type Fe(II)Fe(III) 2D Networks.
- Author
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Sahadevan SA, Abhervé A, Monni N, Sáenz de Pipaón C, Galán-Mascarós JR, Waerenborgh JC, Vieira BJC, Auban-Senzier P, Pillet S, Bendeif EE, Alemany P, Canadell E, Mercuri ML, and Avarvari N
- Abstract
The mixed-valence Fe
II FeIII 2D coordination polymer formulated as [TAG][FeII FeIII (ClCNAn)3 ]·(solvate) 1 (TAG = tris(amino)-guanidinium, ClCNAn2- = chlorocyanoanilate dianionic ligand) crystallized in the polar trigonal space group P3. In the solid-state structure, determined both at 150 and at 10 K, anionic 2D honeycomb layers [FeII FeIII (ClCNAn)3 ]- establish in the ab plane, with an intralayer metal-metal distance of 7.860 Å, alternating with cationic layers of TAG. The similar Fe-O distances suggest electron delocalization and an average oxidation state of +2.5 for each Fe center. The cation imposes its C3 symmetry to the structure and engages in intermolecular N-H···Cl hydrogen bonding with the ligand. Magnetic susceptibility characterization indicates magnetic ordering below 4 K and the presence of a hysteresis loop at 2 K with a coercive field of 60 Oe. Mössbauer measurements are in agreement with the existence of Fe(+2.5) ions at RT and statistic charge localization at 10 K. The compound shows semiconducting behavior with the in-plane conductivity of 2 × 10-3 S/cm, 3 orders of magnitude higher than the perpendicular one. A small-polaron hopping model has been applied to a series of oxalate-type FeII FeIII 2D coordination polymers, providing a clear explanation on the much higher conductivity of the anilate-based systems than the oxalate ones.- Published
- 2018
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34. Synthesis and Physical Properties of Purely Organic BEDT-TTF-Based Conductors Containing Hetero-/Homosubstituted Cl/CN-Anilate Derivatives.
- Author
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Ashoka Sahadevan S, Monni N, Abhervé A, Auban-Senzier P, Canadell E, Mercuri ML, and Avarvari N
- Abstract
Radical cation salts composed of a bis(ethylenedithio)tetrathiafulvalene (ET) donor with homo-/heterosubstituted Cl/CN anilic acids as purely organic molecular conducting materials formulated as [BEDT-TTF]
2 [HClCNAn] (1) and [BEDT-TTF][HCl2 An] (2) have been prepared by electrocrystallization. Compounds 1 and 2 crystallized in the monoclinic space group P2/c for 1 and I2/a for 2, showing segregated donor-anion layers arranged in a α'-type donor packing pattern (1) and twisted parallel columns (2), respectively. Single-crystal conductivity measurements show that 1 is a semiconductor with room-temperature conductivity of 10-2 S cm-1 and an activation energy Ea of 1900 K.- Published
- 2017
- Full Text
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35. Bilateral breast reconstruction with DIEP flaps: 4 years' experience.
- Author
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Drazan L, Vesely J, Hyza P, Castagnetti F, Stupka I, Justan I, Novak P, and Monni N
- Subjects
- Adult, Breast Neoplasms prevention & control, Esthetics, Feasibility Studies, Female, Humans, Mastectomy methods, Middle Aged, Patient Satisfaction, Postoperative Complications, Quality of Life, Retrospective Studies, Treatment Outcome, Mammaplasty methods, Surgical Flaps
- Abstract
Unlabelled: Bilateral prophylactic mastectomy without reconstruction is not accepted by the majority of patients. Successful reconstruction is therefore a mandatory condition for prophylactic mastectomy. Of the many options for autologous breast reconstruction, the deep inferior epigastric perforator (DIEP) flap best meets requirements for bilateral reconstruction in selected patients. The goal of this study is to verify the feasibility of the procedure in our conditions and to find out how it is accepted by patients. We present 55 consecutive patients who were scheduled for bilateral DIEP flap reconstruction during a 4-year period. We reviewed medical charts, performed clinical assessments and processed anonymous questionnaires. There were 77 immediate and 33 delayed breast reconstructions. There was 100% flap survival and no microanastomoses revisions. In 11 patients (10%) the surgeon preferred to convert the DIEP into a mini transverse rectus abdominis muscle (miniTRAM) flap in order to provide adequate blood supply., Complications: revision for haematoma under the flap in four patients (7.2%), excessive blood loss in four patients (7.2%) and partial mastectomy skin flap necrosis in 10 immediate breast reconstructions (12.9%). Patients' evaluation of the aesthetic result was good or excellent in 96.2% of cases. In 33.9% of patients the postoperative quality of life was considered unchanged and 50.9% of them it even improved. The DIEP flap is recommended for bilateral breast reconstruction. Occasional conversion into a miniTRAM flap can increase the total flap survival rate. Bilateral prophylactic mastectomy and DIEP flap reconstruction are very well accepted by patients.
- Published
- 2008
- Full Text
- View/download PDF
36. The preservation of a spare hemi-abdominal flap in unilateral breast reconstruction with abdominal free flap in high risk patients.
- Author
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Vesely J, Hyza P, Monni N, Lonigro J, Stupka I, DiMatteo A, and Choudry U
- Subjects
- Breast Neoplasms surgery, Female, Humans, Mastectomy, Middle Aged, Risk Factors, Surgical Flaps, Abdominal Muscles transplantation, Breast surgery, Plastic Surgery Procedures methods
- Abstract
Background: Unilateral breast reconstruction with a free abdominal TRAM or DIEP flap restores the shape of the amputated breast with acceptable donor site morbidity. In patients with small breasts and ample lower abdominal tissue this can be achieved by using only a hemi-abdominal flap. In these cases, the contra-lateral flap is usually discarded, but it could potentially be left in situ as a "spare" hemi-abdominal flap, especially in patients at high risk for contra-lateral breast cancer or flap failure. We report our early experience with this preservation technique., Material and Methods: The authors report two cases of unilateral breast reconstruction with hemi-abdominal DIEP free flaps in women at high risk for contra-lateral breast cancer and/or flap failure, who opted not to have prophylactic contra-lateral mastectomies. They consented to having the unused "spare" hemi-abdominal deepithelialized flap left in situ in case the need for a secondary flap arose., Results: The "spare" hemi-abdominal flap was used for immediate reconstruction as an SIEA free flap when the first patient's original flap necrosed secondary to microcirculation problems. The second patient's spare flap was left in situ by burying it after de-epithelialization., Conclusions: We believe that patients undergoing unilateral breast reconstruction who are at high risk for contra-lateral breast cancer and/or free flap failure, and who choose not to undergo an immediate contra-lateral prophylactic mastectomy, should have the "spare" hemi-abdominal flap buried. This tissue could be used as a potential bailout flap in cases of original flap failure or for contralateral breast reconstruction at a later date.
- Published
- 2008
37. New technique of total phalloplasty with reinnervated latissimus dorsi myocutaneous free flap in female-to-male transsexuals.
- Author
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Vesely J, Hyza P, Ranno R, Cigna E, Monni N, Stupka I, Justan I, Dvorak Z, Novak P, and Ranno S
- Subjects
- Coitus, Female, Humans, Male, Muscle Contraction, Muscle, Skeletal transplantation, Penis physiology, Penis surgery, Plastic Surgery Procedures methods, Surgical Flaps, Transsexualism surgery
- Abstract
From December 2001 to September 2005, the technique of total penile reconstruction with a reinnervated free latissimus dorsi myocutaneous flap was used in 22 patients (24-38 years old) with gender dysphoria. These patients were followed up for at least 11 months (range, 11-44 months). All flaps survived. Complications include hematoma (7 cases), vascular thrombosis (2 cases), partial necrosis (1 case), excessive swelling of the neophallus (3 cases), and skin graft loss at the donor site (1 case). Of the 19 patients included in the final evaluation, the transplanted muscle was able to obtain contraction in 18 (95%) cases and 8 patients (42%) had sexual intercourse by contracting the muscle to stiffen and move the neopenis. The described technique of neophalloplasty proved to be a reliable technique and the muscle movement in the neophallus can be expected in almost all cases. The muscle contraction in the neophallus leads to "paradox" erection-stiffening, widening, and shortening of the neopenis, which allows for sexual intercourse in some patients. Subsequent reconstruction of the urethra is possible.
- Published
- 2007
- Full Text
- View/download PDF
38. Neo-phalloplasty with re-innervated latissimus dorsi free flap: a functional study of a novel technique.
- Author
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Ranno R, Veselý J, Hýza P, Stupka I, Justan I, Dvorák Z, Monni N, Novák P, and Ranno S
- Subjects
- Coitus physiology, Female, Humans, Male, Muscle, Skeletal transplantation, Penis anatomy & histology, Penis physiology, Plastic Surgery Procedures methods, Surgical Flaps, Transsexualism surgery
- Abstract
Twenty two patients with gender dysphoria underwent neo-phalloplasties using a novel technique. Latissimus dorsi musculocutaneus re-innervated free flap was used to allow voluntary rigidity of the neo-penis. From the first 22 patients, 18 have obtained motoric function of reconstructed penis; the "paradox erection" was obtained. 14 patients came for examination after a follow-up period of mean 26.4 months. We evaluated the motility and shape changes of neo-phallus measuring its different size and dimension during relax and muscle contraction. The range of neo-phallus length in relaxed position was between 7 and 17 cm (mean 12.2 cm), its circumference in the same position had a range between 13 and 20 cm (mean 13.7 cm). All patients were able to contract the muscle with an average length reduction of 3.08 cm and an average circumference enlargement of 4 cm. In this study, the dimensions and motility were quantified demonstrating the neo-phallus function and size changes during sexual intercourse.
- Published
- 2007
39. The bilobed arterialized venous free flap for simultaneous coverage of 2 separate defects of a digit.
- Author
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Hyza P, Vesely J, Stupka I, Cigna E, and Monni N
- Subjects
- Adolescent, Debridement, Female, Humans, Microsurgery, Plastic Surgery Procedures, Finger Injuries surgery, Surgical Flaps blood supply
- Abstract
We report a case of a 17-year-old patient who sustained multiple finger contusions on the left hand. After thorough debridement, the volar and dorsal defects of the middle finger were covered simultaneously with bilobed arterialized venous free flap from the left forearm. The flap was composed of 2 paddles, which were connected by a subcutaneous bridge containing a subcutaneous venous network. The subdermal plexus in the bridge was interrupted with no impairment of blood supply to the second cutaneous paddle. The flap survived completely with only temporary mild venous congestion. Excellent functional and cosmetic result was reached. We consider bilobed arterialized venous free flap as a useful option for coverage of concomitant volar and dorsal digital defects.
- Published
- 2005
- Full Text
- View/download PDF
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