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Related Concept Videos

Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

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...
The Debye–Hückel Theory of Electrolyte Solutions01:27

The Debye–Hückel Theory of Electrolyte Solutions

The Debye–Hückel theory, established by Peter Debye and Erich Hückel in 1923, is a fundamental concept in physical chemistry. It provides an understanding of the behavior of strong electrolytes in solution, particularly explaining their deviations from ideal behavior.The theory is based on Coulombic interactions (the attraction or repulsion between charged particles) between ions in solution. In an ionic solution, oppositely charged ions tend to attract each other. This means that cations...
Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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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 basic...

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Updated: Jun 26, 2026

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
05:33

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

Charge on a weak polyelectrolyte.

Shengqin Wang1, Steve Granick, Jiang Zhao

  • 1Beijing National Laboratory of Molecular Science, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

The Journal of Chemical Physics
|January 7, 2009
PubMed
Summary
This summary is machine-generated.

Single-molecule fluorescence reveals local pH near poly-2-vinyl pyridine is 1000x higher than bulk pH. Monovalent salt addition shifts the polyelectrolyte

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Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
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Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes

Published on: January 30, 2015

Area of Science:

  • Polymer Chemistry
  • Physical Chemistry
  • Spectroscopy

Background:

  • Weak polyelectrolytes exhibit complex solution behavior influenced by pH and ionic strength.
  • Single-molecule fluorescence offers high sensitivity for probing nanoscale properties.
  • Traditional methods like light scattering are insufficient for dilute polymer solutions.

Purpose of the Study:

  • To measure the local pH and hydrodynamic size of a weak polyelectrolyte at very low concentrations.
  • To investigate the effect of bulk pH and monovalent salt on polyelectrolyte conformation.
  • To understand the interplay between hydrophobic attraction and electrostatic repulsion.

Main Methods:

  • Single-molecule fluorescence spectroscopy was employed to analyze poly-2-vinyl pyridine (P2VP) end-labeled with a pH-sensitive dye.
  • Hydrodynamic size and local pH (inferred from dye brightness) were measured.
  • The coil-to-globule transition was observed by varying bulk pH and salt concentration.

Main Results:

  • The local pH near the dye was consistently three orders of magnitude higher than the bulk pH.
  • Monovalent salt addition shifted the coil-to-globule collapse transition to a higher bulk pH.
  • Salt addition appeared to increase the net electric charge of the polyelectrolyte chain at a given pH.

Conclusions:

  • Single-molecule fluorescence is crucial for resolving properties of dilute weak polyelectrolytes.
  • Local pH significantly deviates from bulk pH, impacting polyelectrolyte behavior.
  • Salt influences the ionization equilibrium and conformational transitions of weak polyelectrolytes, distinct from strong polyelectrolytes.