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Prof. Fabio Bruni

Struttura: Dip. Scienze
Ruolo: Professore Associato
Mansioni Esterne:
Gruppi di Ricerca: Liquidi ;
Corsi del CD: Fisica della Materia Biologica
Orario Ricevimento
Email: bruni|At| fis.uniroma3.it
Home Page-> www.fis.uniroma3.it/liquidsgroup
Telefono: (+39) 065733 7223
Fax: (+39) 0657337102
Cellulare Aziend.: 87882
Edificio: Via della Vasca Navale 84
Piano: T
Stanza: 150


Fabio Bruni got a Degree in Physics in 1986, and he then obtained a Ph.D. in Biophysics at Cornell University (USA) in 1991. Researcher in the Department of Physics at Università di Roma Tre from 1995 to 2004, he is at present Associate Professor of Physics (FIS/07) in the same institution.
He has been member of the selection panel for the ISIS neutron source from december 2002 until december 2004, and member of the Board of the International Dielectric Society from december 2002 until december 2004.
He is a consultant for Centro Linceo Interdisciplinare "B. Segre", Accademia Nazionale dei Lincei, and for the Segretariato Generale della Presidenza della Repubblica.
His scientific activity, documented by more than 90 articles in international journals, has been mainly centered on,

• Dynamic percolation and hopping of protons in biosystems.
• Macroscopic quantum mechanics effects in chains of water molecules
• Glass transition and survival of anhydrous organisms.
• Analogies between a protein and a spin glass.
• Structure of water in solutions, under extreme thermodynamic conditions, and in confined geometries.

These studies have been performed mainly by means of Broadband Dielecfric spectroscopy techniques (he has set up an apparatus covering 12 frequency decades), Thermally Stimulated Depolarization techniques, and neutron scattering supported by Monte Carlo computer simulations.
The following results, among those published, should be considered of particular relevance::

• The first experimental determination of the temperature dependence of orientational defects in polycrystalline ice. The most interesting result is indeed the temperature dependence of the dielectric relaxation time of such defects, that can be successfully described by the “Dissipative Quantum Tunneling” theory, firstly proposed at the beginning of 1990 and experimentally tested in the temperature region around 50mK for SQUID devices and around 260 K for polycrystalline ice.
• The first experimental determinations of the microscopic structure of water near the critical point and in confined geometries. The characteristic properties of of water at ambient conditions are dependent upon the ability of the water molecule to form an extended network of hydrogen bonds. The most interesting results include an unexpected density dependence of the length of the hydrogen bond, and the absence of tetrahedral coordination near the critical point and under conditions of strong confinement.
• The first experimental determinations of the hydration shells of the H+ and OH- ions: these results are at odds with the currently accepted ones and forced a re-consideration of the shell microscopic structure and coordination numbers.
Moreover, his most recent studies suggested a possible microscopic description for the electrostriction effect in terms of equivalent pressure to be applied to the pure solvent to obtain the same effect due to the presence of solutes.
In addition, a very recent experimental work that, based on data taken by mean of Deep Inelastic Neutron Scattering technique, suggests a possible link between the kinetic energy of water protons and the oxygen-oxygen intermolecular distance. This, in turn, is dictating the anomalous temperature dependence of water density. These results provide a possible key to interpret microscopically a well known albeit still not understood macroscopic property of water.

Ultimo aggiornamento della scheda:2013-06-25

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