Departamento de Física

Este viernes de 15:30hs. a 18hs. en el laboratorio de grado vamos a utilizar la cámara rápida Phantom V1210 , ese tipo de experimentos que rompen la cabeza, te lo vas a perder?

Publicado por Departamento de Física-UNS el jueves, 15 de junio de 2017
 Noticias del Departamento
 15 Jun 2017
Charlas informativas viernes 16 de junio
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 Noticias del Departamento
 15 Jun 2017
Charlas informativas viernes 16 de junio
image
 Noticias del Departamento
 15 Jun 2017
Charlas informativas viernes 16 de junio
image
 Noticias del Departamento
 15 Jun 2017
Charlas informativas viernes 16 de junio
image
 Noticias del Departamento
 15 Jun 2017
Charlas informativas viernes 16 de junio
image
 Noticias del Departamento
 15 Jun 2017
Charlas informativas viernes 16 de junio
image
 Noticias del Departamento
 15 Jun 2017
Charlas informativas viernes 16 de junio
image

Polymer brushes are of great importance for new technologies and applications in health care, lubrication of surfaces, protective coatings, switchable wetting, etc.  We use Molecular Dynamics simulations to study the behavior of a model polymer brush comprised of semi-stiff linear macromolecules when pressure is applied on the brush surface by a planar piston. We find a two-stage process:  for a small compression the chains were shown to contract by buckling deformation whereas for a larger compression the chains exhibit a collective (almost uniform) bending deformation.
This deformation proceeds as a 2nd-order phase transition. Surprisingly, the pressure, required to keep the stiff brush at a given degree of compression, is significantly smaller than for an otherwise identical brush made of entirely flexible polymer chains!
A simple theoretical consideration suggests a ‘soliton solution’ of the pertinent nonlinear differential equation, which describes the deformation of the stiff brush, in good agreement with results of the computer experiment.

Professor Andrey Milchev
Bulgarian Academy of Sciences, Institute for Physical Chemistry, Sofia, Bulgaria

Sala de conferencias del departamento de Física, Viernes 9 de Junio 15:00 hs

Publicado por Departamento de Física-UNS el martes, 13 de junio de 2017
 Defensa Oral de Tesis
 7 Jun 2017
Defensa de Tesis - Javier Gómez
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Departamento de Física, Universidad Nacional del Sur
 Avenida Alem 1253 - Bahía Blanca, Buenos Aires, Argentina
 Tel: 54-(0291)-4595141
 Fax: 54-(0291)-4595142
2010 - 2018
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