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SUMMARY:Contr. Talk 5 - The effects of high-power ultrasound on colloidal 
 gels
DTSTART;VALUE=DATE-TIME:20181210T170000Z
DTEND;VALUE=DATE-TIME:20181210T172000Z
DTSTAMP;VALUE=DATE-TIME:20260523T113043Z
UID:indico-contribution-505@lindico453.srv.lu.se
DESCRIPTION:Speakers: Noémie Dagès ()\nLow-intensity ultrasound is widel
 y used to probe and image biological tissues.Yet\, yltrasound can also be 
 used at high power to destroy nodules or burn tumors. We try to transpose 
 and understand the latter effects in soft matter. We first show that high-
 power ultrasound softens colloidal gels. Upon applying ultrasound at 45kHz
  for a few tens of seconds on various gels in a rheometer\, we find that t
 he elastic modulus of the gel is weakened and that its fluidization is fas
 tened. As ultrasound is turned off\, the gel recovers its elasticity. To i
 nvestigate this process at the micron scale\, we then probe the gel under 
 ultrasound with small-angle X-ray scattering (ESRF\, ID02). These experime
 nts show a strong effect of the ultrasound excitation on the SAXS spectra 
 both on a colloidal gel at rest and under flow.\n\nhttps://lindico453.srv.
 lu.se/event/67/contributions/505/
LOCATION:Elite Hotel Ideon Tera
URL:https://lindico453.srv.lu.se/event/67/contributions/505/
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