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6 June 2019

Nanocomposites under tensile strain: anisotropic and heterogeneous dynamics.

At a very low volume fraction (< 1%), nanoparticles do not modify significantly the mechanical or dynamical properties of nanocomposites. It follows that nanoparticles can be used as tracers or probes for revealing the dynamics of strained polymer chains. Researchers of the Laboratory, in collaboration with other scientists of Grenoble and of two foreign Universities, have investigated the dynamics of stretched elastomer chains by means of X-Ray Photon Correlation Spectroscopy (XPCS). The two-time correlation functions determined in the directions parallel and perpendicular to that of the tensile strain, display anisotropic and heterogeneous dynamics.

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21 March 2019

Neurons : The parallel dynamics of multiple ion channels revealed by optical imaging

In neurons, electrical and calcium signals result from the synergistic simultaneous activity of several ion channel types. In the current issue of Journal of Neuroscience, researchers of the LIPhy and their international collaborators report a study where, for the first time, they reconstructed the parallel activity of diverse calcium and potassium channels during a physiological synaptic input in native neurons.

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21 February 2019

A biomimetic experiment to understand the drying of leaves

The resistance of trees to drought is a growing concern in the context of global warming. Under dry conditions, embolisms can appear in the sap network within leaves, potentially stopping the circulation and leading to leaf drying. However, the propagation and growth of embolisms in leaves remains poorly understood. Researchers from LIPhy have undertaken a physical study to study such embolisms in an artificial leaf.

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14 February 2019

The syncopated groove of red blood cells: an ode to their discreet diversity.

Red blood cells have a subtle mechanics which is not fully described by current models, that enables them to perform their oxygen transport function, . LIPhy researchers, in collaboration with Université Libre de Bruxelles, carried out an extensive experimental study of their dynamics in shear flow which shows a multiplicity of simultaneous dynamic states linked to the variability of properties between cells. This constitutes a reference work for the validation of new models.

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8 January 2019

Sensing a picoliter for the direct measurement of liquid flow rate in nanofluidicis

Physicists developed recently a simple sensor to measure minute liquid flow rates. This sensor, based on the accumulation of liquid within a deformable membrane, has been developed for the study of flows in nanofluidics. In particular, this sensor is devoted to the characterisation of coupled transport phenomena within a single nanopore. These phenomena, that remain partially understood, are of interest for water treatment and renewable energy conversion.

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