2PM

Two-point microrheology of heterogeneous langmuir films

Coordinatore	UNIVERSITE LYON 1 CLAUDE BERNARD    more  Organization address address: BOULEVARD DU 11 NOVEMBRE 1918 NUM43 city: VILLEURBANNE CEDEX postcode: 69622 contact info Titolo: Dr. Nome: Javier Cognome: Olaiz Email: send email Telefono: 33472697600 Fax: 33472697609
Nazionalità Coordinatore	France [FR]
Totale costo	225˙615 €
EC contributo	225˙615 €
Programma	FP7-PEOPLE Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
Code Call	FP7-PEOPLE-2011-IOF
Funding Scheme	MC-IOF
Anno di inizio	0
Periodo (anno-mese-giorno)	0000-00-00   -   0000-00-00

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	UNIVERSITE LYON 1 CLAUDE BERNARD  Organization address address: BOULEVARD DU 11 NOVEMBRE 1918 NUM43 city: VILLEURBANNE CEDEX postcode: 69622 contact info Titolo: Dr. Nome: Javier Cognome: Olaiz Email: send email Telefono: 33472697600 Fax: 33472697609	FR (VILLEURBANNE CEDEX)	coordinator	225˙615.75

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 Obiettivo del progetto (Objective)

'On the one hand, microrheology has been a powerful tool since the mid-80's for characterizing 3D viscoelastic materials. On the other hand, the study of soft interfaces has identified several poorly characterized complex systems including low-surface-viscosity Langmuir films and spatially heterogeneous Langmuir films. This proposal represents a merger between these two ideas: we propose to characterize the rheological properties of interfaces, taking into account their full complexity, including adjacent 3D materials, microscopic spatial heterogeneities and nonlinear effects. We will develop and enhance a two-particle surface microrheology, and provide this way new characterizations of these soft interfaces.

Using this method, our research objectives include: [1] measuring very low surface viscosities achieved by spreading surfactants (DpPC) at an air/water interface and which are so low that they have not been measured by other techniques. Then, turning to monolayers of proteins (beta-lactoglobulin), we will further extend this technique to viscoelastic membranes and measure surface elasticities. [2] Focusing on heterogeneous monolayers with complex properties. Under surface pressure, surfactants form heterogeneous structures such as liquid expanded and liquid condensed phases to which we will apply our technique to measure length-scale dependent surface viscosities. We will finally measure the flow field and extend a 3D model by Levine and Lubensky to capture the most important features of the rheology of this spatially heterogeneous films. If successful, the model will be able to account for differences between the 1-particle and 2-particle measurements, in other words, reconciling the local and global rheological behavior of the interface.

This project provides benchmark experiments on heterogeneous flat layers paving the way for further studies of more complex systems such as cell plasma membranes which present heterogeneous surfaces and curvature.'