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Related Concept Videos

Dielectric Polarization in a Capacitor01:31

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
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Potential Due to a Polarized Object01:29

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Theory of Strong Electrolytes01:23

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The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Complementary surface charge for enhanced capacitive deionization.

X Gao1, S Porada2, A Omosebi1

  • 1Center for Applied Energy Research, University of Kentucky, Lexington, KY 40511, USA.

Water Research
|February 16, 2016
PubMed
Summary
This summary is machine-generated.

Chemically modified activated carbon cloth electrodes significantly improve salt removal in capacitive deionization (CDI). Using opposite polarity discharge voltages enhances CDI performance, validating theoretical predictions.

Keywords:
Amphoteric Donnan modelCapacitive deionizationEnhanced salt removalExtended working voltage window

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Environmental Engineering

Background:

  • Capacitive deionization (CDI) is a promising technology for water desalination.
  • The performance of CDI is highly dependent on the properties of the electrode materials.
  • Optimizing electrode surface chemistry is crucial for enhancing salt adsorption capacity.

Purpose of the Study:

  • To chemically modify activated carbon cloth electrodes to enhance their surface charge.
  • To investigate the impact of these modified electrodes on salt removal efficiency in CDI.
  • To validate theoretical predictions regarding enhanced and extended-voltage CDI effects.

Main Methods:

  • Commercially available activated carbon cloth electrodes were treated with nitric acid and ethylenediamine solutions.
  • Modified and untreated electrodes were tested in a CDI cell under various charging and discharge voltage conditions.
  • Salt removal was quantified and compared between the chemically treated and untreated electrodes.

Main Results:

  • Chemically surface-charged electrodes demonstrated substantially improved salt removal compared to untreated electrodes.
  • Utilizing a discharge voltage with opposite polarity to the charging voltage significantly enhanced salt removal.
  • Experimental results validated the theoretical predictions of enhanced CDI and extended-voltage CDI effects.

Conclusions:

  • Chemical surface charge modification is a key factor for enhancing salt removal in CDI.
  • Optimizing the electrode's chemical surface charge can extend the CDI working voltage window.
  • Chemical surface charge in carbon micropores is foundational for efficient salt removal in CDI cells.