Abstract:Size and shape of dispersed objects defines properties of suspensions, emulsions, and foams, such as stability, texture, and flow. Accordingly, a rational product design requires reliable size distribution analysis. This is particularly challenging in dense foams. An endoscopic setup was optimized for bubble imaging minimizing light reflections, uneven illumination, and foam distortion. A software tool was developed detecting large quantities of foam bubbles at dispersed phase fractions up to 93 % from images … Show more
“…The bubbles size distribution was automatically determined from the images without further processing using a template matching based bubble detection tool as described elsewhere. 22 The images were screened for similarities with circular templates differing in radius and the Sauter bubble radius R 32 was calculated from the ensemble of detected bubbles. At specific foam ages corresponding to desired gas volume fractions between 0.85 and 0.95, foams were transferred into the gap of a plate-plate geometry and sheared in oscillation using a rotational rheometer (RheoScope 1, Thermo Fisher Scientific) at 1 Hz frequency and varying stress amplitude between 0.1 and 100 Pa as described in ref.…”
Section: Foam Preparation and Characterizationmentioning
The link between interfacial elasticity of foaming solutions and the elasticity and yield stress of their aqueous foams is probed for a variety of surfactant, block-copolymer, protein, and particle-stabilized (Pickering)...
“…The bubbles size distribution was automatically determined from the images without further processing using a template matching based bubble detection tool as described elsewhere. 22 The images were screened for similarities with circular templates differing in radius and the Sauter bubble radius R 32 was calculated from the ensemble of detected bubbles. At specific foam ages corresponding to desired gas volume fractions between 0.85 and 0.95, foams were transferred into the gap of a plate-plate geometry and sheared in oscillation using a rotational rheometer (RheoScope 1, Thermo Fisher Scientific) at 1 Hz frequency and varying stress amplitude between 0.1 and 100 Pa as described in ref.…”
Section: Foam Preparation and Characterizationmentioning
The link between interfacial elasticity of foaming solutions and the elasticity and yield stress of their aqueous foams is probed for a variety of surfactant, block-copolymer, protein, and particle-stabilized (Pickering)...
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