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UID:0-83@lisn.upsaclay.fr
DTSTART;TZID=Europe/Paris:20230112T140000
DTEND;TZID=Europe/Paris:20230112T160000
DTSTAMP:20230105T142048Z
URL:https://www.lisn.upsaclay.fr/evenements/carbon-black-gels-yielding-sof
 tening-under-high-power-ultrasound-and-flow-properties/
SUMMARY:Carbon black gels: yielding\, softening under high power ultrasound
 \, and flow properties
DESCRIPTION:Carbon black particles are rigid fractal colloidal particles ob
 tained through the incomplete combustion of petroleum products. Dispersed 
 in mineral oil\, at low volume fractions\, the carbon black particles are 
 attractive and assemble thanks to Brownian motion into fractal gels. Carbo
 n black gels belong to the category of shear-reversible gels\, meaning tha
 t the gels can reform rapidly after being sheared\, like shampoo gels but 
 unlike gelatin [1]. Here\, I'll discuss the properties of these out-of-equ
 ilibrium soft solids using a wide range of experimental techniques such as
  rheology\, ultrasound velocimetry or Small Angle X-ray Scattering. First\
 , I'll discuss how those carbon black gels yield when subject to a constan
 t stress or fatigue experiments (delayed yielding [2]). Second\, I'll show
  how the gel properties are affected by high power ultrasound (rheo-acoust
 ic gels [3]). Finally\, I'll discuss how they flow and form tunable gels w
 hen shear interfere with the gelation process (multiple metastable gels ob
 tained through flow cessation [4]).\n[1] Heat-and shear-reversible network
 s in food: A review. A. V. Kierulf et al.21\, 3405 CRFSFS (2022)[2] Hetero
 geneous yielding dynamics in a colloidal gel. T Gibaud\, D Frelat\, SManne
 ville. Soft Matter 6\, 3482 (2010)[3] Rheo-acoustic gels: Tuning mechanica
 l and flow properties of colloidal gelswith ultrasonic vibrations. T Gibau
 d\, et al. Phys. Rev. X 10\, 011028 (2020)[4] Interpenetration of fractal 
 clusters drives elasticity in colloidal gelsformed upon flow cessation. N 
 Dagès\, et al. Soft Matter 18\, 6645 (2022)\nAccès Salle des séminaires
  FAST-LPTMS (Bât. 530\, salle C.120\, 1er)
CATEGORIES:Mécanique
LOCATION:France
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DTSTART:20221030T020000
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