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18 December 2019

Faceted bubbles, or how to stabilize bubbles with 3D printing


Air bubbles in water are excellent acoustic resonators, good candidates for the manufacturing acoustic metamaterials, but have the disadvantage of being difficult to keep in place, in addition to dissolving quickly. Grenoble physicists have shown that it is possible to create "faceted bubbles" attached to 3D printed substrates to solve the issues of conventional spherical bubbles, while preserving their acoustic properties.

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13 December 2019

Elastic avalanches in amorphous solids

When a sufficiently large stress is applied to amorphous solids (e.g. glasses, foams), these solids deform plastically, i.e. undergo flow at a finite strain rate. In this work, we study the much less characterized situation of a solid which is deformed at very small strains, with a macroscopic behavior that appears to be perfectly elastic and reversible.

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10 December 2019

Deterministic chaos reproduces the randomness of living microswimmers

Several microorganisms (bacteria, algae...) explore the surrounding space in search of nutrients by following a linear walk for a period of time (called a "run") followed by a sudden change in direction (called a "tumble") and so on. This type of trajectory is known as a "run-and-tumble". The theoretical work carried out at the Liphy shows that artificial swimmers (phoretic particles) can autonomously perform the same type of run and tumble movement as living microorganisms by evoking relatively simple but robust physical mechanisms only.

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2 December 2019

Conformation change induces agregation

Pluronic F127 are neutral tri-block copolymers forming micelles that are largely studied for drug delivery. We observed the structures and organization of the micelles in presence of a natural polyelectrolyte having important biological functions, the hyaluronic acid in semi-dilute regime, as a function of the nature and concentration of added salt by differential scanning calorimetry and small angle neutron scattering.

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28 November 2019

Cell crawling in a fluid

Cell motility, the spontaneous movement of cells from one location to another, plays a fundamental role in many biological processes, including immune responses and metastasis. Recent physics studies have gathered new evidence suggesting that mammalian cells do not only crawl on solid substrates, including complex 3-D mediums of a tissues, but can also swim in fluids.

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