Contribution to the Design of a Space Telescope

Rahmani, M.; Bouafia, Mohamed; Rahmani, Dieny Redha; Mebarki, N.; Mimouni, J.

doi:10.1063/1.3518324

Cited by 1 publication

(2 citation statements)

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“…Following earlier work, which focussed on the slow evolution of the contact angle 25 , they state that thermal fluctuations drive the net displacement of the contact line, hindered by surface nanostructures. In our experiments we also did not observe a simple scaling of the adsorption time with viscosity .…”

Section: Cryosem Measurementsmentioning

confidence: 99%

“…Effects of particle size 21 and surface charge 22 on the global adsorption kinetics have been investigated. Using holographic microscopy Kaz et al monitored the adsorption of single particles and observed that the fast initial adsorption was followed by an intriguing and unexpectedly slow relaxation 23 , which was been attributed to surface defects and contact line pinning 24,25 . Boniello and coworkers showed that a particle straddling an air/water interface feels a large viscous drag that is unexpectedly larger than the one measured in the bulk.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Ellipsoidal Particles at Liquid–Liquid Interfaces

Coertjens

Dier²,

Moldenaers

et al. 2017

Langmuir

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The adsorption of particles at liquid-liquid interfaces is of great scientific and technological importance. In particular for non-spherical particles, the capillary forces which drive adsorption vary with position and orientation and complex adsorption pathways have been predicted by simulations. Based on the latter it has been suggested that the time scales of adsorption are determined by a balance between capillary and viscous forces. However, several recent experimental results point out the role of contact line pinning in the adsorption of particles to interfaces, and even suggest that the adsorption dynamics and pathways are completely determined by the latter, with the timescales of adsorption being determined solely by particle characteristics. In the present work the adsorption trajectories of model ellipsoidal particles are investigated experimentally using cryo-SEM and monitoring the altitudinal orientation angle using high speed confocal microscopy. By varying the viscosity and the viscosity jump across the interfaces we specifically interrogate the role of viscous forces.

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Section: Cryosem Measurementsmentioning

confidence: 99%