BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Clare Rees-Zimmerman - Diffusiophoresis of latex in silica and Moh
 ammed Al-Sharabi  - Investigating the liquid transport kinetics of ceramic
  powder compacts using terahertz pulsed imaging - Clare Rees-Zimmerman and
  Mohammed Al-Sharabi\, BPI
DTSTART:20211118T113000Z
DTEND:20211118T123000Z
UID:TALK165970@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:Clare Rees-Zimmerman - Diffusiophoresis of latex in silica\n \
 nAnalogous to diffusion\, diffusiophoresis is the motion of particles alon
 g the concentration gradient of a different particle type. One mechanism t
 hat can cause diffusiophoresis is an excluded volume effect\, occurring wh
 ere there is a mixture of particle sizes. In this talk\, a Hele-Shaw exper
 iment investigating evidence for diffusiophoresis in particles of differen
 t size ratios will be presented.\n\nMohammed Al-Sharabi  - Investigating t
 he liquid transport kinetics of ceramic powder compacts using terahertz pu
 lsed imaging\n\nThe liquid penetration into ceramic powder compacts is an 
 important phenomenon in many processes\, such as tablet disintegration in 
 the pharmaceutical field as well as impregnation in the catalysis field. T
 his study aims at providing a better understanding of the effect of the pr
 eparation conditions and type of solvent on the liquid transport kinetics 
 of ceramic powder compacts to enhance their design and performance. Terahe
 rtz pulsed imaging (TPI) was used to investigate the impact of the heating
  rate during sintering (firing) on the water penetration into α-alumina p
 owder compacts that were prepared at different compaction forces. The TPI 
 method was also used for the first time to study the transport of a less p
 olar solvent\, i.e. 1-octanol\, into a range of α-alumina compacts and co
 mpare the transport results to those of water. For 1-octanol\, it is possi
 ble to study the imbibition process as well as any changes in the sample s
 tructure behind the liquid front\, such as the change in the effective ref
 ractive index of the sample and the fill fraction of solvent in the sample
 . The TPI results reveal that the alumina samples fired at the largest hea
 ting rate of 200 °C h-1 have the largest water penetration rate compared 
 to the heating rates of 100 °C h-1 and 150 °C h-1. The results confirm t
 hat both the microstructure characteristics\, particularly porosity\, as w
 ell as the surface properties\, i.e. wettability\, influence the liquid tr
 ansport kinetics. It was also found that the effective refractive index of
  the sample\, obtained through the analysis of the peak behind the liquid 
 front\, increases as a function of time upon the transport of 1-octanol in
 to the sample due to the increase in the fill fraction of the solvent in t
 he sample. The results demonstrate the usefulness of the TPI method to qua
 ntitatively investigate the transport of solvents with different polaritie
 s into ceramic powder compacts that are prepared at different manufacturin
 g conditions for better quality control and optimised design and performan
 ce of such materials.
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
END:VEVENT
END:VCALENDAR