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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

24.2K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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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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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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Ion Channels01:19

Ion Channels

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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
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Formation of Complex Ions03:45

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Predicting Precipitation
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Dispersion of Nanomaterials in Aqueous Media: Towards Protocol Optimization
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Potential-Dependent, Switchable Ion Selectivity in Aqueous Media Using Titanium Disulfide.

Pattarachai Srimuk1,2, Juhan Lee1,2, Simon Fleischmann1,2

  • 1INM-Leibniz Institute for New Materials, Saarbrücken, Germany.

Chemsuschem
|May 2, 2018
PubMed
Summary
This summary is machine-generated.

Electrochemical water treatment can be tuned by voltage, not just material. This study demonstrates controllable ion selectivity using titanium disulfide electrodes, enabling selective removal of magnesium or cesium ions.

Keywords:
capacitive deionizationion separationpotential differencetitanium disulfidewater desalination

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Environmental Engineering

Background:

  • Electrochemical ion removal is key for water treatment applications like softening and heavy-metal remediation.
  • Ion intercalation materials typically show inherent selectivity for specific ion types, often favoring monovalent ions.
  • Existing methods rely on material modification for ion selectivity.

Purpose of the Study:

  • To introduce a novel approach for tunable ion selectivity by altering operational voltage, rather than modifying electrode materials.
  • To investigate the use of titanium disulfide (TiS2) and carbon nanotubes (CNTs) for controllable cation selectivity.
  • To demonstrate the ability to switch selectivity between different cations by adjusting electrochemical potential.

Main Methods:

  • Fabrication of binder-free composite electrodes using titanium disulfide and carbon nanotubes.
  • Electrochemical intercalation experiments with aqueous solutions of cesium chloride (CsCl) and magnesium chloride (MgCl2).
  • Online monitoring of effluent ion concentrations using inductively coupled plasma optical emission spectrometry (ICP-OES).

Main Results:

  • Achieved a molar selectivity of Mg2+ over Cs+ of 31 in the potential range of -396 mV to -220 mV vs. Ag/AgCl.
  • Demonstrated Cs+ preference over Mg2+ by a factor of 1.7 in the potential window from -219 mV to +26 mV vs. Ag/AgCl.
  • Showcased voltage-tunable cation selectivity using TiS2-based electrodes.

Conclusions:

  • Electrochemical potential is a powerful tool for controlling ion selectivity in water treatment.
  • TiS2-based electrodes offer a versatile platform for selective ion removal by adjusting operational voltage.
  • This voltage-tuning approach provides a new strategy for advanced water purification technologies.