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Related Concept Videos

Chemical Reactions in Aqueous Solutions03:03

Chemical Reactions in Aqueous Solutions

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Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.
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Aqueous Solutions and Heats of Hydration02:42

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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
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Leveling Effect and Non-Aqueous Acid-Base Solutions02:11

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This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
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The Power Flow Problem and Solution01:26

The Power Flow Problem and Solution

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Power flow problem analysis is fundamental for determining real and reactive power flows in network components, such as transmission lines, transformers, and loads. The power system's single-line diagram provides data on the bus, transmission line, and transformer. Each bus k in the system is characterized by four key variables: voltage magnitude Vk​, phase angle δk​, real power Pk​, and reactive power Qk​. Two of these four variables are inputs, while the power flow program computes...
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Determining the pH of Salt Solutions04:08

Determining the pH of Salt Solutions

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The pH of a salt solution is determined by its component anions and cations. Salts that contain pH-neutral anions and the hydronium ion-producing cations form a solution with a pH less than 7. For example, in ammonium nitrate (NH4NO3) solution, NO3− ions do not react with water whereas NH4+ ions produce the hydronium ions resulting in the acidic solution.  In contrast, salts that contain pH-neutral cations and the hydroxide ion-producing anions form a solution with a pH greater than 7. For...
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General Properties of Solutions02:12

General Properties of Solutions

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Many common substances around us exist as a solution, such as ocean water, air, and gasoline. All solutions are mixtures of substances that are composed of varying amounts of two or more types of atoms or molecules. A mixture with a non-uniform composition is a heterogeneous mixture, whereas a mixture with a uniform composition is a homogeneous mixture. The components that make the homogeneous mixture are evenly spread out and thoroughly mixed. 
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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

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Cation-induced electrohydrodynamic flow in aqueous solutions.

Kentaro Doi1, Fumika Nito1, Satoyuki Kawano1

  • 1Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.

The Journal of Chemical Physics
|June 6, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel electrohydrodynamic (EHD) flow method using ion transport for precise liquid control in microfluidics. This low-voltage technique offers enhanced manipulation of fluids at the nanoscale.

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A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
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A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
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Area of Science:

  • Microfluidics and Nanofluidics
  • Physical Chemistry
  • Fluid Dynamics

Background:

  • Precise control of liquid flow is crucial for single-molecule manipulation in micro- and nanofluidic channels.
  • Microscopic understanding of electrolyte ion-solvent interactions is needed for advanced fluid dynamics.
  • Existing methods like electroosmotic flow have limitations in controlling liquid dynamics.

Purpose of the Study:

  • To propose and investigate a new technique for generating electrohydrodynamic (EHD) flow driven by ion transport.
  • To develop a mathematical model for EHD flow in ionic currents and validate it with experimental data.
  • To demonstrate low-voltage induction of EHD flow for enhanced microfluidic control.

Main Methods:

  • Generation of EHD flow by dialyzing electrolyte ions using a cation-exchange membrane.
  • Application of an electric body force distinct from electroosmotic flows.
  • Development of a mathematical model for EHD flow dynamics and comparison with experimental results.

Main Results:

  • Successfully generated EHD flows driven by cation-dominant ionic currents.
  • Achieved efficient EHD flow induction at a drastically reduced electric potential of 2.0 V.
  • Demonstrated the feasibility of inducing EHD flows in aqueous solutions without excessively high voltages.

Conclusions:

  • The proposed ion-transport-driven EHD flow method enables precise liquid control in micro- and nanofluidic systems.
  • This technique offers a significant advantage with its low-voltage operation compared to previous methods.
  • The findings open new possibilities for low-voltage driven liquid flow control in various scientific applications.