Chemotaxis of Oil Droplets and Their Phase Transition to Aggregates with Membrane Structures in Surfactant Solution Containing Metal Salts

2021 ◽  
Author(s):  
Taisuke Banno ◽  
Sepia Nakayama ◽  
Tomoya Kojima ◽  
Mari Kaburagi ◽  
Takanori Kikuchi ◽  
...  
Keyword(s):  
Phase Transition ◽  
Surfactant Solution ◽  
Metal Salts ◽  
Membrane Structures ◽  
Oil Droplets

Surface Tension and Bubbles

2011 ◽  
Vol 354-355 ◽  
pp. 37-40
Author(s):  
Cai Xia Xu ◽  
Hai Rong Tang
Keyword(s):  
Phase Transition ◽  
Surface Tension ◽  
Liquid Phase ◽  
Vapor Pressure ◽  
Saturated Vapor Pressure ◽  
Saturated Vapor ◽  
Surfactant Solution ◽  
Liquid Phase Transition ◽  
Almost All

From a molecular perspective, we described the origin of surface tension. Surface tension is exceptionally good at rounding things out, such as bubbles can produce in surfactant solution , also in liquid or vapor-liquid phase transition. Through the experiment of determination of saturated vapor pressure of pure liquids, maybe we can conclude that almost all the bubbles were generated as result of the breakup of the gas-liquid interface.

Self-Propelled Oil Droplets and Their Morphological Change to Giant Vesicles Induced by a Surfactant Solution at Low pH

Langmuir ◽  
2016 ◽  
Vol 32 (37) ◽  
pp. 9591-9597 ◽  
Author(s):  
Taisuke Banno ◽  
Yuki Tanaka ◽  
Kouichi Asakura ◽  
Taro Toyota
Keyword(s):  
Morphological Change ◽  
Surfactant Solution ◽  
Low Ph ◽  
Giant Vesicles ◽  
Oil Droplets

scholarly journals Photoinduced Collective Motion of Oil Droplets and Concurrent Pattern Formation in Surfactant Solution

2021 ◽  
Author(s):  
Tomoya Kojima ◽  
Hiroyuki Kitahata ◽  
Kouichi Asakura ◽  
Taisuke Banno
Keyword(s):  
Pattern Formation ◽  
Collective Motion ◽  
Surfactant Solution ◽  
Light Illumination ◽  
Artificial System ◽  
Oil Droplets ◽  
Uv Illumination ◽  
Azobenzene Moiety ◽  
Visible Light Illumination ◽  
Far From Equilibrium

Collective motion is ubiquitous in living systems. Although various biomimetic artificial systems have been constructed, there have been few studies reported on collective motion induced by the coupling of chemical reactions, diffusion and convection in a far-from-equilibrium state. In this study, we report an artificial system of oil droplets in a surfactant solution wherein the collective motion of multiple droplets and pattern formation occurred concurrently. Using photo-responsive surfactants with an azobenzene moiety, the assembly of droplets and the formation of circular patterns around the formed droplet clusters occurred under UV illumination, whereas the disassembly of droplets and disappearance of the patterns occurred under subsequent visible light illumination. The observed dynamics were induced by Marangoni flows based on the reversible photoisomerisation of azobenzene-containing surfactants. The phenomena were considered analogous to the bioconvection of microorganisms. These findings could be useful for understanding the mechanism of motion of life in terms of physicochemical aspects.<br>

Phototactic behavior of self-propelled micrometer-sized oil droplets in a surfactant solution

2017 ◽  
Vol 53 (14) ◽  
pp. 2237-2240 ◽  
Author(s):  
Sho Kaneko ◽  
Kouichi Asakura ◽  
Taisuke Banno
Keyword(s):  
Equilibrium State ◽  
Surfactant Solution ◽  
Oil Droplets ◽  
Phototactic Behavior ◽  
Far From Equilibrium

We demonstrate the phototactic behavior of self-propelled micrometer-sized oil droplets in a far-from-equilibrium state.

scholarly journals Photoinduced Collective Motion of Oil Droplets and Concurrent Pattern Formation in Surfactant Solution

2021 ◽  
Author(s):  
Tomoya Kojima ◽  
Hiroyuki Kitahata ◽  
Kouichi Asakura ◽  
Taisuke Banno
Keyword(s):  
Pattern Formation ◽  
Collective Motion ◽  
Surfactant Solution ◽  
Light Illumination ◽  
Artificial System ◽  
Oil Droplets ◽  
Uv Illumination ◽  
Azobenzene Moiety ◽  
Visible Light Illumination ◽  
Far From Equilibrium

Collective motion is ubiquitous in living systems. Although various biomimetic artificial systems have been constructed, there have been few studies reported on collective motion induced by the coupling of chemical reactions, diffusion and convection in a far-from-equilibrium state. In this study, we report an artificial system of oil droplets in a surfactant solution wherein the collective motion of multiple droplets and pattern formation occurred concurrently. Using photo-responsive surfactants with an azobenzene moiety, the assembly of droplets and the formation of circular patterns around the formed droplet clusters occurred under UV illumination, whereas the disassembly of droplets and disappearance of the patterns occurred under subsequent visible light illumination. The observed dynamics were induced by Marangoni flows based on the reversible photoisomerisation of azobenzene-containing surfactants. The phenomena were considered analogous to the bioconvection of microorganisms. These findings could be useful for understanding the mechanism of motion of life in terms of physicochemical aspects.

scholarly journals Spontaneous deformation and fission of oil droplets on an aqueous surfactant solution

2020 ◽  
Vol 102 (4) ◽  
Author(s):  
Masahide Okada ◽  
Yutaka Sumino ◽  
Hiroaki Ito ◽  
Hiroyuki Kitahata
Keyword(s):  
Surfactant Solution ◽  
Oil Droplets ◽  
Aqueous Surfactant Solution ◽  
Spontaneous Deformation
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