Gas discharges

Plasma sources based on discharges created by direct current, capacitively coupled radiofrequency, inductively coupled radiofrequency and microwaves are characterized by thermal non-equilibrium condition and therefore modelled by kinetic approaches: polynomial expansion, state-to-state and particle-based (Particle-in-Cell, Monte Carlo and Molecular Dynamics) methods.

gas discharges

Low- & High-Pressure Electric Discharges

In many technological plasmas formed in electrical discharges, the onset of non-equilibrium conditions significantly affect the EEDF (electron energy distribution function) determining large deviation from Maxwell distribution. The shape of the EEDF depends not only on the gas composition, but also on the level distribution. The synergy between electrons and excited states is investigated by a self-consistent approach, instead of the common assumption electron-impact process rates depending only on the applied reduced electric field (E/N). Self-consistent model demonstrate a very large impact in the post-discharge phase (E/N=0), where excited states transfer energy to free electrons through superelastic collisions, creating pronounced structures in the EEDF as peaks and plateaux.

Different gas discharge configurations (DC glow, DBD, RF capacitive and inductive, MW and helicon discharges) have been studied using multidimensional Particle-in-Cell/Monte Carlo Collisional (PIC-MCC) approach [1, 2]. The methodology allows the characterization of plasma-gas dynamics and kinetics in the self-consistent electromagnetic field taking into account volume and surface processes. Self-organized structures and non-equilibrium effects of electron distribution function, ion distribution function, molecular vibrational distribution function and production of hot atoms have been detected in the different cases. The same numerical technique has been applied to model zoomed region of the different discharges studied (sheath regions in ExB glow discharges, plume expansion, extraction region in RF-inductive negative ion source) and experimental diagnostic methods (electrostatic probe, laser photodetachment).

CO2 Destruction

The plasma assisted conversion of greenhouse gases, such as CO2, is collecting a large interest in the community both for its scientific relevance and also for technological applications in energetic and environment fields. CO2 dissociation is the first step in the global conversion process. Discharge mechanisms that promote dissociation through vibrational excitation can maximize the energy efficiency of the conversion.
This is a new research line and the results, due to their relevance in the modeling community, have been published as a Fast Track Communication in the Plasma Sources Science and Technology Journal

Nucleation and growth of nanoparticle in plasma

Laser ablation of solids in liquids is considered a very efficient technique for the synthesis of nanocrystals. The most important feature is the extreme confinement effect of liquid, i.e., the liquid restricts the expansion of the plasma plume. The extreme confined conditions and induced high-pressure region favor the formation of unusual metastable phases. These advantages allow the designer to combine selected solid targets and liquid to fabricate compound nanostructures with desired functions. The kinetic approach to model the nanoparticle nucleation and growth is based on the explicit sequential nanoparticle charging, ion adhesion and atom evaporation as the nanoparticle grows and as the plasma parameters (density and temperature) in which it is immersed change. Particle-based numerical models has been chosen to simulate this process

Facilities & Labs

HPC Cluster and Services @ Bari

People

Fracnesco_tacccognaFrancesco

Taccogna

CNR Researcher

Pierpaolo_minelliPierpaolo

Minelli

CNR Researcher

ldpietanzaLucia Daniela

Pietanza

CNR Researcher

gcolonnaGianpiero

Colonna

CNR Researcher

savino_longoSavino

Longo

Associate Professor

mcapitelliMario

Capitelli

Associate Professor

Publications

  1. N. Oudini, N. Sirse, F. Taccogna, A. R. Ellingboe and A. Bendib, Photo-detachment signal analysis to accurately determine electronegativity, electron temperature, and charged species density, Appl. Phys. Lett. 109, 124101 (2016); doi: 10.1063/1.4963138
  2. L. D. Pietanza, G. Colonna, V. Laporta, R. Celiberto, G. D’Ammando, A. Laricchiuta, and M. Capitelli, Influence of Electron Molecule Resonant Vibrational Collisions over the Symmetric Mode and Direct Excitation-Dissociation Cross Sections of CO2 on the Electron Energy Distribution Function and Dissociation Mechanisms in Cold Pure CO2 Plasmas, J.Phys. Chem. A, 120 (2016) 2614–2628, Doi: 10.1021/acs.jpca.6b01154
  3. L. D. Pietanza, G. Colonna, G. D’Ammando, A. Laricchiuta, M. Capitelli, Non equilibrium vibrational assisted dissociation and ionization mechanisms in cold CO2 plasmas, Chem. Phys. 468 (2016) 44, Doi: 10.1016/j.chemphys.2016.01.007
  4. L. D. Pietanza, G. Colonna, G. D’Ammando, A. Laricchiuta, M. Capitelli, Electron energy distribution functions and fractional power transfer in “cold” and excited CO2 discharge and post discharge conditions, Phys. Plasmas, 23 (2016) 013515  Doi: 10.1063/1.4940782
  5. G. Colonna, V Laporta, R Celiberto, M Capitelli and J Tennyson, Non-equilibrium vibrational and electron energy distributions functions in atmospheric nitrogen ns pulsed discharges and μs post-discharges: the role of electron molecule vibrational excitation scaling-laws, Plasma Sources Science and Technology, 24 (2015) 035004,  Doi: 10.1016/j.chemphys.2016.01.007
  6. G. D’Ammando, G Colonna, M Capitelli and A Laricchiuta, Superelasticcollisions under low temperature plasma and after glow conditions: A golden rule to estimate their quantitative effects, Phys. Plasmas 22 (2015) 034501, Doi: 10.1063/1.4913670
  7. M. Capitelli, G. Colonna, G. D’Ammando, V. Laporta, A. Laricchiuta, Non equilibrium dissociation mechanisms in low temperature nitrogen and carbon monoxide plasmas,ChemicalPhysics 438 (2014) 31-36, Doi: 10.1016/j.chemphys.2014.04.003
  8. M. Capitelli, G Colonna, G D’Ammando, V Laporta and A Laricchiuta, The role of electron scattering with vibrationally excited nitrogen molecules on non-equilibrium plasma kinetics, Phys. Plasmas 20 (2013) 101609, Doi: 10.1063/1.4824003
  9. F. Taccogna, Non-classical plasma sheaths: space-charge-limited and inverse regimes under strong emission from surfaces, Europ. Phys. J. D 68(7), 199-206, (2014); ISNN: 1434-6060; doi: 10.1140/epjd/e2014-50132
  10. M. Capitelli, I. Armenise, E. Bisceglie, D. Bruno, R. Celiberto, G. Colonna, G. D’Ammando, O. De Pascale, F. Esposito, C. Gorse, V. Laporta, A. Laricchiuta, Thermodynamics, Transport and Kinetics of Equilibrium and Non-Equilibrium Plasmas: A State-to-State Approach, Plasma Chemistry and Plasma Processing 32 (2012 427),doi:10.1007/s11090-011-9339-7

Projects

MWPECVD: Microwave Plasma Enhanced Chemical Vapor Deposition – Progetto Strategico ATS PS_136 (2007 – 2010)

Progetto Partenariati Regionali per l’Innovazione – PUGLIA Fesr (2007-2013)

APULIA SPACE: Esperti nell’uso di tecnologia abilitanti nel settore dello spazio,  PON03PE_00067_6, (2014-2016)

Latest News

Loretta del Mercato, si aggiudica l'ERC STARTING GRANT 2017

Loretta del Mercato, si aggiudica  l'ERC STARTING GRANT 2017

uno dei bandi più competitivi a livello europeo.

Lecce, 6 settembre 2017 

Lo European Research Council, che promuove la ricerca di eccellenza in Europa, nei giorni scorsi ha reso noti i nomi dei 406 vincitori della selezione ERC STARTING GRANT 2017, il bando tra i più competitivi a livello internazionale.

Su 3085 progetti presentati, 406 i progetti selezionati a cui sono stati destinati i 605 i milioni di euro di investimento. 48 le nazioni di provenienza dei ricercatori, soltanto 17 gli Italiani che condurranno le loro ricerche nel nostro paese, tra cui Loretta del Mercato, ricercatrice dell'Istituto di Nanotecnologia del Consiglio Nazionale delle Ricerche di Lecce.

Un importante riconoscimento alla ricerca nel settore della medicina di precisione condotta presso il CNR NANOTEC, un indiscusso premio al talento della giovane ricercatrice che, a 38 anni e un contratto a tempo determinato, sarà a capo del progetto "Sensing cell-cell interaction heterogeneity in 3D tumor models: towards precision medicine – INTERCELLMED".

Il progetto, il cui obiettivo è affrontare uno dei problemi più spinosi della ricerca sul cancro, ovvero la difficoltà nel trasformare i risultati delle ricerche scientifiche in applicazioni cliniche per i pazienti e che vedrà coinvolto l'Istituto tumori "Giovanni Paolo II" di Bari, si propone di sviluppare nuovi modelli in vitro 3D di tumore del pancreas, alternativi ai modelli animali, ingegnerizzati con un set di sensori nanotecnologici che consentiranno di monitorare le interazioni delle cellule tumorali con il loro micorambiente, verificare l'appropriatezza delle terapie prima della somministrazione ai pazienti oncologici e quindi prevedere la risposta dei singoli pazienti ad una o più terapie antitumorali.

La realizzazione di queste piattaforme 3D multifunzionali consentirà di superare le evidenti differenze intercorrenti tra "modelli animali" ed esseri umani fornendo dati attendibili ed in tempi più rapidi rispetto ai dati ottenuti tramite lunghi e costosi procedimenti di sperimentazione sugli animali. Le tecnologie e i modelli sviluppati saranno estesi anche ad altre forme di tumori solidi nonché impiegati per studi nell'ambito della ingegneria tissutale e della medicina rigenerativa.

Rassegna stampa e Video

Zeiss Microscopy Technology and Complete Correlative Workflow

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Zeiss Microscopy Technology and Complete Correlative Workflow

Lecce, Italy, 2017 Wednesday July 19th 

CNR NANOTEC @ Lecce, Aula Seminari – pal. G, Piano Terra

Program - PDF

Zeiss, as microscopy technology leader, provides the unique complete imaging solution ranging from light, confocal, electron, ion and Xray modalities with a complete and straightforward correlative workflow. An overview of different technologies will be presented with a special focus on X-Rray microscopy.

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MCS 2017

International Workshop on Micropropulsion and CubeSats

Bari, Italy, 26 - 27 June 2017

Program - MSC2017

This narrow-field, invited-only meeting is the first attempt to bring together the Materials and Micropropulsion communities with a view to contribute to the development of the Global Materials and Micropropulsion Roadmap, and set such meetings to a regular basis.