Sunday 24 September 2017
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Colloidal Soft Matter

Our research interests are mainly related to the study of the "Structure, Dynamics and Rheology of Colloidal Suspensions". The systems investigated are charge-stabilized, magnetic and neutral colloidal dispersions.
Within the employed methods, we can mention: Ornstein-Zernike-type integral equation schemes, for the structure; and, mode-coupling schemes for Brownian systems, Stokesian Dynamics and Brownian Dynamics computer simulations, for the dynamics and rheology.
Current projects:

  • Diffusion and rheology of charged and neutral colloids.
  • Diffusion and rheology in charge-stabilized and weakly attractive colloidal mixtures.
  • Long-time self-diffusion and rheology of highly concentrated hard-sphere colloids.

Participants:

  • Adolfo Banchio

Collaborations:

  • G. Nägele, Forschungszentrum Jülich, Alemania.
  • J.F. Brady, California Institute of Technology, USA.

Criticality and Entanglement in Quantum Few Body Systems

We study the behavior of weakly bound-states in quantum few body systems near critical points, where the ground-state energy changes abruptly as a function of one of the Hamiltonian parameters. This critical behavior is relevant for stability, ionization and dissociation problems in atomic and molecular Hamiltonians. Currently we propose to analyze the electron binding capacity of several molecules models, including multipolar potentials and exotic molecules (one or more particles are antiparticles, such as positrons or antiprotons).

Another way to characterize quantum states in systems of several particles comes from the study of entanglement. The entanglement contains information about the correlations in the state, but it is itself a resource very useful in Quantum Information (QI); manipulation of entanglement in a system by tuning some of its parameters, not only gives information on the physics of the problem but also on its possible use to implement QI. The project points to research entanglement in spins chains, particle traps, quantum dots, and other indentified systems on wich QI could be possible. At the same time, we study basic properties of entangled quantum states such as the critical behavior in weakly bound states, its dynamics in disipatives systems or its behavior in systems with long range interactions.

Participants:

  • Pablo Serra
  • Omar Osenda
  • Guido Raggio
  • Julio H. Toloza (UNN)
  • Federico Pont
  • Analía Zwick
  • Alejandro Ferrón (actualmente Investigador en UNNE- Corrientes)


Dynamics of Complex Systems

Non-equilibrium dynamics in micro-nano structures systems: magnetic domain walls, superconducting vortices, bio-ratchets.
Rheology and dynamics of colloidal systems: gel.


Participants:

  • Verónica Marconi
  • Francisco Tamarit
  • Pablo Sartorio
  • Pablo Serra
  • Iván Berdakin
  • Carlos Condat

Dynamics of Vesicles and Membranes

This research line is oriented to the study of the mecanical and dynamical properties of closed supramolecular structures with membrane walls. In particular, lipidic vesicles and liposomes are considered. We study mecanical stability of the vesicles, and its relation to the structure and dynamics of the membrane.

Participants:

  • Adolfo J. Banchio
  • Ezequiel Farrher

Entanglement of Quantum States of Composite Systems

Study of basic features of the entanglement of quantum states. For example: criteria for separability/entanglement; asymptotic temporal behaviour of entanglement in open systems; spectral characterization of separable states.

Participants:

  • Guido A. Raggio

Modeling Dynamic Processes In Biophysics

We apply mathematical modeling and numerical simulation to various biophysical problems of current interest. They include, but are not limited to:

  • The formulation of macroscopic and mesoscopic models of the various stages of cancer growth and therapy.
  • The interaction between the parasite population and the immune system in Chagas disease and the effects of external intervention.
  • The energetics and dynamics of bacterial motion.
  • The construction of a comprehensive biophysical model for the dynamics of agonist-activated ionic channels.
  • The evolution of the olfactory system.
  • The evolution of epidemics in a system of mobile agents


Participants:

  • Carlos Condat
  • Gustavo Sibona
  • Silvia Menchón (Post-doc en la Universidad de Lovaina, Bélgica.)
  • Lucas Barberis
  • Iván Berdakin
  • Mario Disalvo
  • Soledad Castaño
  • Horacio Mors

Pattern formation and statistical mechanics of ultrathin magnetic films

Magnetic materials films  (ex., Fe)  with a few monolayers thickness deposited on a non-magnetic metalic substrate (ex., Cu) present highly regular and complex out of plane magnetic domain patterns, such as periodic arrays with alternated magnetization sign in the form of stripes, labyrinths, bubbles, etc..  Such patterns often correspond to different thermodynamical phases.  The main objective  of this line of research is to understand and characterize how those patterns are generated and modified as the external conditions, such as temperature, external magnetic fields, sample preparation conditions, etc., are varied.  In particular, we study the critical properties of the transitions between the thermodynamical phases associated to the different paterrns.


 Participantes:

  • Sergio A. Cannas
  • Orlando V. Billoni
  • Marianela Carubelli
  • Santiago A. Pighin
  • Francisco A. Tamarit

Colaboraciones:

  • Daniel A. Stariolo, Universidade Federal do Rio Grande do Sul, Brasil
  • Danilo Pescia,  ETHZ, Zürich, Suiza
  • Alessandro Vindigni, ETHZ, Zürich, Suiza
  • Sebastian Bustingorry, CAB, Bariloche, Argentina