Publications by authors named "Saori Suda"
Microdroplets driven by the Marangoni effect are known to continue to swim for hours despite their simple composition. This swimming microdroplet changes its motion from straight to curvilinear and further to chaotic as the Péclet number increases. In this study, we investigate the effect of external perturbations on the three-dimensional axis-asymmetric model of a droplet driven by the Marangoni effect.
View Article and Find Full Text PDFIn this Letter, a water-in-oil swimming droplet's transition from straight to curvilinear motion is investigated experimentally and theoretically. An analysis of the experimental results and the model reveal that the motion transition depends on the susceptibility of the droplet's direction of movement to external stimuli as a function of environmental parameters such as droplet size. The simplicity of the present experimental system and the model suggests implications for a general class of transitions in self-propelled swimmers.
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- The study examines how self-propelled water-in-oil droplets behave when confined in different capillaries, revealing that dropping velocity decreases with increased confinement but stabilizes at high confinement levels.
- The research finds that as droplets are confined, unusual flow dynamics occur, including a thinning lubrication layer and neck formation at the droplet's rear, culminating in spontaneous splitting under very high confinement.
- An analytical model integrating interface activity with micelle transport is proposed to explain these dynamics, including the stabilization of velocity and the unique lubrication patterns that lead to droplet division.
Scientific communication through social media, particularly Twitter has been gaining importance in recent years. As such, it is critical to understand how information is transmitted and dispersed through outlets such as Twitter, particularly in emergency situations where there is an urgent need to relay scientific information. The purpose of this study is to examine how original tweets and retweets on Twitter were used to diffuse radiation related information after the Fukushima Daiichi nuclear power plant accident.
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- The study analyzes the movement patterns of micron-sized nematic liquid crystal droplets in a surfactant solution, observing that smaller droplets switch from random to helical to straight motion as they dissolve.
- The velocity of droplets declines in straight and helical modes as their size decreases, while it remains size-independent during random motion.
- The research identifies that the transition between helical and straight motion is influenced by the self-propelled velocity and relates to the Ericksen number, with more complex movements like "figure-8s" occurring in smaller confined environments due to autochemotaxis.