Thermal plasmas

Equilibrium (or LTE) plasmas are characterized, deriving thermodynamic, transport properties and equilibrium composition, in a wide range of pressure and temperatures, ranging from technological applications to planetary atmospheres and stellar plasmas.

atmospheres

Thermodynamics and Transport in Equilibrium Plasmas

Thermodynamic properties and equilibrium chemical composition of complex gas mixtures (Earth, Mars and Jupiter atmospheres) have been calculated in the framework of the statistical thermodynamics, exploiting a fast and stable algorithm for the solution of the chemical equilibrium composition with the hierarchical approach. A simplified model, the two-level approach, to calculate partition functions and thermodynamic properties of atomic species has been proposed, reducing the number of the true atomic states in few virtual levels through a grouping procedure.
Transport coefficients (thermal conductivity λ, viscosity η and electrical conductivity σe) for plasmas generated in the impact of space vehicles on different planetary atmospheres (Earth, Jupiter, Mars), have been derived, in the framework of the Chapman Enskog theory, considering a high-order approximation and including also minor species. The core of the calculation is represented by the characterization of binary interactions, i.e. the derivation of collision integrals, describing the microscopic dynamics. The phenomenological approach has been proposed and validated for a number of different systems, that is based on modeling the average interparticle interaction with a phenomenological potential, whose parameters can be estimated through correlation formulas from physical properties of the collisional partners. Moreover a novel efficient algorithm has been implemented based on fractal integration.
The web-access computational tool EquilTheta, that calculates chemical equilibrium product concentrations, thermodynamic and transport properties for a given mixture in wide temperature and pressure ranges, is the focus of a business plan for the creation of a CNR-UniBAS spin-off.

High-Density Plasmas

The thermodynamic properties and the electrical conductivity of non-ideal, high-density hydrogen plasma have been investigated, accounting for quantum effects due to the change in the energy spectrum of atomic hydrogen when the electron-proton interaction is considered embedded in the surrounding particles. High-density conditions have been simulated assuming a simple confined-atom model, with the atom fixed in the centre of a spherical box, or atomic hydrogen subject to a screened Coulomb potential.

Laser-induced Plasmas

Laser induced plasma, LIP, is a technique of growing interest in different fields such as material processing, diagnostic, chemical analysis and space applications (Mars Curiosity Rover). Theoretical investigations have been dedicated to verify the assumption of local thermodynamic equilibrium (LTE), commonly considered for calibration-free LIBS.

  1. titanium laser-induced plume expansion
    Nanosecond laser pulsed have been used to evaporate metal and metal oxides, in different environments, such as vacuum chamber, free air and water, in this last case also simulating the bubble dynamics. The role of chemical reactions in the dynamics of plume expansion has been investigated under different assumptions, such as LTE, free flow (without reactions) and chemical kinetics.
  2. collisional-radiative (CR) model of aluminium-laser induced plasma
    A deeper analysis can be carried out by considering a collisional radiative model for atomic metals, using experimental values of plume parameters such as pressure and temperature.
  3. electron and phonon dynamics in metals
    A similar approach can be used to investigate electron and phonon gas in a solid hitted by a fs laser pulse, exciting the electrons, which relax in ps range exchanging energy with the phonon-lattice.

Fluctuations in Gases and Plasmas

Fluctuation theory describes fundamental plasma processes and also provides expressions for the spectral densities of fluctuating plasma quantities as function of the averaged distribution function. This particular outcome of the fluctuation framework constitutes the basis of a number of independent diagnostics that can be implemented in diverse plasma environments. While fluctuation theory is rigorous for collisionless fully ionized plasmas, there exist regimes where approximate methods have to be invoked. Numerical experiments, which are performed by mean of Molecular Dynamics simulations, allows us to explore such regimes which are intractable by the analytical approach.

Facilities & Labs

HPC Cluster and Services @ Bari

People

Domenico_bruno

Domenico

Bruno

CNR Researcher

gcolonnaGianpiero

Colonna

CNR Researcher

alaricchiutaAnnarita

Laricchiuta

CNR Researcher

mcapitelliMario

Capitelli

Associate Professor

ldpietanza

Lucia Daniela

Pietanza

CNR Researcher

savino_longo

Savino

Longo

Professor Associate

adangolaAntonio

D’Angola

Professor Associate

Publications

  1. D. Bruno, A. Frezzotti, G.P. Ghiroldi, Oxygen transport properties estimation by classical trajectory–direct simulation Monte Carlo, Phys. Fluids 27 057101 (2015). DOI: 10.1063/1.4921157.
  2. V. Laporta, D. Bruno, Electron-vibration energy-exchange models in nitrogen-containing plasma flows, J. Chem. Phys. 138 104319 (2013). DOI: 10.1063/1.4794690.
  3. D. Bruno, F. Esposito, V. Giovangigli, Relaxation of rotational-vibrational energy and volume viscosity in H-H2 mixtures, J. Chem. Phys. 138 084302 (2013). DOI: 10.1063/1.4792148.
  4. M. Tuttafesta, A. D’Angola, A. Laricchiuta, P. Minelli, M. Capitelli, G. Colonna, GPU and Multi-core based Reaction Ensemble Monte Carlo method for non-ideal thermodynamic systems, Computer Physics Communications, 185, 540–549, (2014); doi: 10.1016/j.cpc.2013.10.017
  5. G. Colonna, A. D’Angola, A. Laricchiuta, D. Bruno, M. Capitelli, Analytical Expressions of Thermodynamic and Transport Properties of the Martian Atmosphere in a Wide Temperature and Pressure Range, Plasma Chemistry and Plasma Processing, 33, 401–431, (2013); doi: 10.1007/s11090-012-9418-4
  6. G. D’Ammando, G. Colonna, M. Capitelli, A simplified approach to calculate atomic partition functions in plasmas, Physics of Plasmas, 20, 032108, (2013); doi: 10.1063/1.4794286
  7. A. V. Kosarim, B. M. Smirnov, A. Laricchiuta, M. Capitelli, Resonant charge-exchange involving excited helium atoms and reactive transport of local thermodynamic equilibrium helium plasma, Physics of Plasmas, 19, 062309, (2012); doi: 10.1063/1.4729727
  8. D. Bruno, G. Colonna, A. Laricchiuta and M. Capitelli, Reactive and internal contributions to the thermal conductivity of local thermodynamic equilibrium nitrogen plasma: The effect of electronically excited states, Physics of Plasmas, 19, 122309, (2012); doi:10.1063/1.4771689
  9. A. D’Angola, G. Colonna, A. Bonomo, D. Bruno, A. Laricchiuta, M. Capitelli, A phenomenological approach for the transport properties of air plasmas, The European Physical Journal D, 66, 205, (2012); doi: 10.1140/epjd/e2012-30147-8
  10. M. Capitelli, G. Colonna, G. D’Ammando, R. Gaudiuso, L. D. Pietanza, Physical Processes in Optical Emission Spectroscopy, Chapter in Laser-Induced Breakdown Spectroscopy in the series Springer Series in Optical Sciences, vol. 182, 31-57, (2014); doi: 10.1007/978-3-642-45085-3_2

Latest News

I° meeting TecnoMed Puglia

Lecce, 05 dicembre 2019 - Aula Rita Levi Montalcini - CNR NANOTEC Lecce

Si terrà domani, giovedì 05 dicembre, con inizio alle ore 14.00 presso l'aula Rita Levi Montalcini del Cnr Nanotec, il "I° meeting TecnoMed Puglia: Tecnopolo per la medicina di precisione". Il meeting mira a fare il punto sulle attività programmate, sullo stato di avanzamento e sugli highlights.

Puoi scaricare la locandina da qui

Jam session Nanotec... note di scienza su scala nanometrica

Lecce, 27 settembre 2019 - ex monastero degli Olivetani "CAR-T: l'alba di una nuova era"  con: Attilio Guarini (IRCCS Istituto Tumori “Giovanni Paolo II” di Bari)  introduce e modera: Marco Ferrazzoli (Ufficio Stampa CNR Roma) a cura di: Gabriella Zammillo 

Le CAR-T (Chimeric Antigens Receptor Cells-T) sono cellule modificate in laboratorio a partire dai linfociti T. Rappresentano una nuova strategia di cura che sfrutta il sistema immunitario per combattere alcuni tipi di tumore come linfomi aggressivi a grandi cellule e leucemie linfoblastiche acute a cellule B. Il prof Attilio Guarini, ematologo all’Istituto tumori Giovanni Paolo II di Bari, le definisce la “vis sanatrix naturae della antica medicina salernitana”, trattandosi del potenziamento dell’attività citotossica dei linfociti del paziente opportunamente ingegnerizzati per riconoscere e contrastare alcuni tipi di cellule tumorali.

 

Le CAR-T possono quindi essere definite un “farmaco vivente” proprio perché prodotto a partire dalle cellule dello stesso paziente aprendo così ad un nuovo mondo, considerato che i farmaci convenzionali sono prodotti da sostanze chimiche o, in alternativa, sono anticorpi prodotti in laboratorio dai biologi. Un trattamento estremamente complesso e costoso, non sempre applicabile, ma laddove possibile, dai risultati incoraggianti per le aspettative di vita. Lo sviluppo di nuove tecnologie per la produzione di CAR-T è parte integrante delle attività di ricerca condotte dal TecnoMed Puglia, il TecnoPolo per la Medicina di Precisione, coordinato da Giuseppe Gigli direttore del Cnr Nanotec di Lecce, e che nel suo nucleo fondatore vede anche l’IRCCS Istituto Tumori “Giovanni Paolo II” di Bari, il Centro di malattie neurodegenerative e dell’invecchiamento cerebrale dell’Università di Bari con sede presso l’Ospedale " G. Panico" di Tricase e la Regione Puglia.

 

L'evento apre la nuova stagione della rassegna divulgativa "Jam session Nanotec: note di scienza su scala nanometrica", un progetto Cnr Nanotec di Gabriella Zammillo, realizzato in collaborazione con Liberrima.

A condurre e moderare la serata, Marco Ferrazzoli, capo ufficio stampa dal CNR. Puoi scaricare la locandina da qui

Notte dei Ricercatori

Lecce, 27 settembre 2019

 

ex monastero degli Olivetani, ore 18:00 - 24:00

 
 Ritorna puntuale la Notte dei Ricercatori, l’evento più atteso dai tanti appassionati di scienza, ghiotti di conoscenza senza distinzione di età. E sempre più densa di contenuti è la partecipazione del @CnrNanotec che, per l’edizione 2019,  ha reso ancora più appetibile il calendario degli appuntamenti programmati all’interno del progetto europeo #ERN-Apulia  coordinato da Unisalento, tracciando un ideale tour tra gli intriganti campi del sapere che si dipana attraverso narrazioni, illustrazioni, laboratori hand-on, dibattiti, giochi per grandi e piccini e rappresentazioni teatrali. Clicca qui per il programma completo delle attività di Nanotec.   Per l'evento completo apri il link: www.laricercaviendinotte.it