Philippe Marmottant

 


Laboratoire Interdisciplinaire de Physique
CNRS-Universite Grenoble 1
140, Avenue de la Physique - BP 87
38402 Saint Martin d'Heres Cedex, France
Phone: +33 4 76 51 42 89
Fax: +33 4 76 63 54 95
philippe.marmottant@ujf-grenoble.fr

Hungry carnivorous plants 1
(French version below)
Aquatic carnivorous bladderworts (Utricularia species) catch prey animals with suction traps. High speed video recordings show that the plant "swallows" its prey in less than a millisecond!

The trapdoor morphology is optimized for a fast opening and closure, which we confirm by numerical simulations. It is an elastic valve that buckles inside (entailing opening) and then unbuckles (closure). These precise motions are coupled with a strong suction swirl causing accelerations up to 600g, and leaving little escape chances for prey animals
.

Le piege ultra-rapide d'une plante carnivore aquatique (Clip en Version Francaise)

  1. -Article published: "Ultra-fast underwater suction traps" [free preprint here] by O. Vincent, C. Wei(beta)kopf, S. Poppinga, T. Masselter, T. Speck, M. Joyeux, C. Quilliet, & P. Marmottant, in the Proceedings of the Royal Society B: Biological Sciences

The ultrasonic dance of bubbles

Under ultrasound, bubbles pulsate and vibrate intensely. In the movie below we show how they interact without contact, and how they feature a surprising collective "dance" and a crystalline self-organisation.

See
"Acoustically bound microfluidic bubble crystals" by D. Rabaud, P. Thibault, M. Matthieu, P. Marmottant, published in Physical Review Letters, 106, 134501 (2011).

Hungry carnivorous plants 2

In this video, we show that aquatic carnivorous plant swallow water after some time, even if there are no prey animals available. For more details consult the article on Plos ONE.


News
April 2014: Start of the project BUBBLEBOOST funded by the European Research Council (ERC Consolidator program).

Fast acoustic tweezers

Strong acoustic waves can exert forces. Here we show how shape ultrasound waves in order to manipulate objects, without any contact, at any desired position. See article in Appl. Phys. Letters.

The walk and jump of horsetail spores
(Equisetum,
preles in French):
a small movie showing the spectacular effects of humidity changes on horsetail spores. See also the article.

The origin of sounds from trees:
We could show that the ultrasonic noises by the wood of trees is due to cavitation bubbles. See also the article.