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Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

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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.
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Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
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Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis02:29

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Overview
Ethers can be prepared from organic compounds by various methods. Some of them are discussed below,
Preparation of Ethers by Alcohol Dehydration
In this method, in the presence of protic acids, alcohol dehydrates to produce alkenes and ethers under different conditions. For example, in the presence of sulphuric acid, dehydration of ethanol at 413 K yields ethoxyethane, whereas it yields ethene at 443 K.
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Structure and Nomenclature of Ethers02:28

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Structure and Bonding
Ethers are organic compounds with an ether functional group which is characterized by an oxygen atom connected to two — identical or different — alkyl, aryl, or vinyl groups. The C–O–C linkage in dimethyl ether — the simplest ether — has an approximately tetrahedral bond angle of 110.3 degrees. The oxygen atom is sp3- hybridized, with the C–O distance being about 140 pm.
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Crown Ethers02:36

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Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether molecules...
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Introduction to Electrolytes01:33

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In humans, electrolytes play a vital role in various physiological processes. Balancing electrolyte levels is essential for normal body functions; their imbalance can be life-threatening. The major electrolytes include sodium, potassium, chloride, calcium, phosphate, and bicarbonate. They are primarily involved in physiological processes, such as nerve signal transmission, membrane trafficking, muscle contraction, buffering body fluids, and balancing water levels in the body.
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Updated: Jan 21, 2026

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Study of High Performance Sulfonated Polyether Ether Ketone Composite Electrolyte Membranes.

Gwomei Wu1,2, Sheng-Jen Lin3, I-Chan Hsu3

  • 1Institute of Electro-Optical Engineering, Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 333, Taiwan. wu@mail.cgu.edu.tw.

Polymers
|July 25, 2019
PubMed
Summary
This summary is machine-generated.

High performance composite electrolyte membranes were developed using polyether ether ketone. Sulfonation and silica nanoparticle blending significantly improved ionic conductivity and mechanical properties while reducing methanol permeability.

Keywords:
composite electrolyte membranenano SiO2polyether ether ketonesulfonationsupercritical carbon dioxide

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Developing high-performance electrolyte membranes is crucial for advanced electrochemical devices.
  • Polyether ether ketone (PEEK) offers a robust polymer backbone but requires modification for enhanced ionic conductivity.
  • Sulfonation and nanoparticle incorporation are key strategies to improve membrane properties.

Purpose of the Study:

  • To prepare and characterize high-performance composite electrolyte membranes based on sulfonated polyether ether ketone (SPEEK).
  • To investigate the effects of silica (SiO2) nanoparticle blending and supercritical CO2 treatment on membrane properties.
  • To optimize the composite membrane for enhanced ionic conductivity, thermal stability, mechanical strength, and reduced methanol permeability.

Main Methods:

  • Polyether ether ketone membranes were synthesized and sulfonated to varying degrees.
  • Nano SiO2 particles were blended into the sulfonated membranes.
  • Composite membranes underwent supercritical carbon dioxide treatment.
  • Protonic conductivity, methanol permeability, thermal stability, and mechanical properties were evaluated.

Main Results:

  • Sulfonation significantly increased ionic conductivity from 10^-4 to 10^-2 S cm^-1.
  • SiO2 blending improved thermal/mechanical properties and reduced methanol permeability to 3.1 × 10^-7 cm^2 s^-1.
  • Supercritical CO2 treatment further enhanced ionic conductivity to 1.55 × 10^-2 S cm^-1 at 10 wt-% SiO2, lowering glass transition and melting temperatures.

Conclusions:

  • The developed sulfonated composite membranes with SiO2 and supercritical CO2 treatment exhibit excellent performance.
  • These membranes demonstrate a favorable balance of high ionic conductivity, low methanol permeability, and robust thermal/mechanical properties.
  • The findings suggest potential for these membranes in applications like fuel cells.