BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:MEchanics GAthering -MEGA- Seminar: Colloids and liquids\, from su
 spensions to superhydrophobicity
DTSTART:20191003T161500
DTEND:20191003T173000
DTSTAMP:20261005T200138Z
UID:7b452a1f49089faf1412826eb6a15df1845acf6c065e53b23b66be33
CATEGORIES:Conferences - Seminars
DESCRIPTION:Philippe Bourrianne\, Department of Mechanical Engineering\, 
 MIT\nColloidal suspensions are ubiquitous in our daily life. Micrometric p
 articles dispersed in a solvent are indeed present in common liquids such 
 as paints\, inks or even food products. We will discuss the properties of 
 those colloidal suspensions from their liquid phase to solid deposits afte
 r drying.\n\nFirst\, colloidal suspensions exhibit a wide range of rheolog
 ical behaviors from shear-thinning to yield stress fluids. We will focus o
 n the shear-thickening transition as dense suspensions experience a dramat
 ic increase in viscosity above a critical shear-stress. By modifying the p
 hysico-chemistry of the particles\, we can tune this rheological transitio
 n and thus understand the interactions involved in this behavior.\n\nIncre
 asing concentration can also be noticed during drying when solvent evapora
 tes: particles finally form a solid deposit. After drying\, a drop of a co
 lloidal suspension leads to a variety of patterns from coffee-stain to mor
 e homogeneous coatings in paintings. We will discuss the effect of the ini
 tial concentration of particles on the drying pattern and on the subsequen
 t mechanical instabilities such as cracks propagation.\n\nFinally\, after 
 the whole drying of the colloidal suspension\, coatings are achieved. Depe
 nding of the nature of the particles\, we can tune the wettability of the 
 substrate up to superhydrophobic solid. We will briefly discuss how such a
  water-repellent substrate can allow levitation of liquids.
LOCATION:MED 2 2423 https://plan.epfl.ch/?room==MED%202%202423
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR