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Related Concept Videos

Solvents01:12

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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Binary fission is the primary mode of asexual reproduction in prokaryotes, such as bacteria. It results in the production of two genetically identical daughter cells. This highly efficient process ensures the rapid propagation of bacterial populations under favorable conditions and involves coordinated cellular and molecular events.DNA Replication and SeparationThe process begins with the replication of the bacterial chromosome. The circular DNA molecule unwinds at a specific origin of...
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Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
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Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
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High Throughput Analysis of Liquid Droplet Impacts
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Active hole generation in a liquid droplet dissolving into a binary solvent.

Noriko Oikawa1, Keita Fukagawa, Rei Kurita

  • 1Department of Physics, Tokyo Metropolitan University, 1-1 Minamioosawa, Hachioji-shi, Tokyo 192-0397, Japan. oikawa@tmu.ac.jp.

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|May 11, 2018
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In liquid-liquid dissolution, a hole spontaneously forms in ionic liquid droplets near the critical point. This phenomenon, driven by concentration fluctuations and the Marangoni effect, leads to droplet motion and active matter behavior.

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Area of Science:

  • Physical Chemistry
  • Soft Matter Physics

Background:

  • Phase separation in liquid-liquid systems is typically controlled by temperature.
  • Multicomponent solvents introduce mole fractions as additional control parameters for phase separation.

Purpose of the Study:

  • To investigate the dissolution of an ionic liquid in a binary ethanol-water solvent near the critical point.
  • To understand the mechanism behind spontaneous hole formation in ionic liquid droplets.

Main Methods:

  • Experimental observation of ionic liquid dissolution in a binary solvent.
  • Analysis of concentration fluctuations and interfacial tension dynamics.
  • Investigation of the Marangoni effect's role in droplet behavior.

Main Results:

  • Spontaneous hole creation within ionic liquid droplets near the critical point.
  • Hole formation initiated by mutual interaction between ionic liquid and binary solvent concentrations.
  • Spatial inhomogeneity of interfacial tension amplified by concentration fluctuations, inducing the Marangoni effect.
  • Observed hole movement within the droplet, leading to droplet locomotion.

Conclusions:

  • The study reveals a novel dissolution process involving spontaneous hole formation.
  • The system serves as a unique example of active matter generated in a liquid droplet.
  • Concentration-driven instability and the Marangoni effect are key to the observed phenomena.