Seminario DFI, Viernes 30 de julio, 16:15 Hrs: fuerza de Casimir crítica
Susana Garay Romero 26 Jul 202126/07/21 a las 18:53 hrs.2021-07-26 18:53:26
The universal force of critical fluctuations: Casimir effect in soft matter.
Dr. Andrea Gambassi
SISSA - International School for Advanced Studies and INFN,
Italy
Resumen
In 1948, Hendrik Casimir predicted that two uncharged conducting surfaces in vacuum attract each other due to the quantum fluctuations of the electromagnetic field which are spatially confined by these surfaces. The classical analogue of this effect originates from the confinement of thermal fluctuations in fluids near continuous phase transitions, such as the demixing of a mixture of two liquids or the normal-superfluid transition in 4He, and it was first investigated theoretically by Michael Fisher and Pierre-Gilles de Gennes in 1978. Early indirect experimental evidence of the force of these fluctuations - known as critical Casimir force - were provided by detailed studies of complete wetting films. Its first direct measurement at the sub-micrometer scale, instead, was achieved only in 2008 by monitoring the Brownian motion of a colloidal particle close to a surface, immersed in a near-critical liquid mixture.
In this talk I will present recent advances in the theoretical and experimental study of the universal properties of this fluctuation-induced force, discussing in particular its non-equilibrium behavior, its non-additivity, and possible relevant applications to soft matter systems.
Fecha y hora: Viernes 30 de julio, 16:15 hrs
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El seminario será transmitido via Zoom por el enlace
uchile.zoom.us/ ... Z01Ia3d1bnQ0S3REUT09
Meeting ID: 893 5917 6363
Passcode: 021892
[se agradece difundir]
——
Rodrigo Soto
Coordinador de seminarios
Departamento de Fïsica - FCFM
Universidad de Chile
www.dfi.uchile.cl
Dr. Andrea Gambassi
SISSA - International School for Advanced Studies and INFN,
Italy
Resumen
In 1948, Hendrik Casimir predicted that two uncharged conducting surfaces in vacuum attract each other due to the quantum fluctuations of the electromagnetic field which are spatially confined by these surfaces. The classical analogue of this effect originates from the confinement of thermal fluctuations in fluids near continuous phase transitions, such as the demixing of a mixture of two liquids or the normal-superfluid transition in 4He, and it was first investigated theoretically by Michael Fisher and Pierre-Gilles de Gennes in 1978. Early indirect experimental evidence of the force of these fluctuations - known as critical Casimir force - were provided by detailed studies of complete wetting films. Its first direct measurement at the sub-micrometer scale, instead, was achieved only in 2008 by monitoring the Brownian motion of a colloidal particle close to a surface, immersed in a near-critical liquid mixture.
In this talk I will present recent advances in the theoretical and experimental study of the universal properties of this fluctuation-induced force, discussing in particular its non-equilibrium behavior, its non-additivity, and possible relevant applications to soft matter systems.
Fecha y hora: Viernes 30 de julio, 16:15 hrs
-----
El seminario será transmitido via Zoom por el enlace
uchile.zoom.us/ ... Z01Ia3d1bnQ0S3REUT09
Meeting ID: 893 5917 6363
Passcode: 021892
[se agradece difundir]
——
Rodrigo Soto
Coordinador de seminarios
Departamento de Fïsica - FCFM
Universidad de Chile
www.dfi.uchile.cl
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