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Related Concept Videos

Electrolyte and Nonelectrolyte Solutions02:21

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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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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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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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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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A Printed and Flexible NO2 Sensor Based on a Solid Polymer Electrolyte.

Ru-Bai Luo1,2, Hai-Bin Li1, Bin Du1,2

  • 1School of Print Packaging and Digital Media, Xi'an University of Technology, Xi'an, China.

Frontiers in Chemistry
|May 14, 2019
PubMed
Summary
This summary is machine-generated.

A novel solid polymer electrolyte (SPE) enhances printed electrochemical sensors. This new material, using poly-vinylidene fluoride (PVDF) and [EMIM][BF4], significantly improves nitrogen dioxide detection sensitivity.

Keywords:
carbon electrodedouble-layered composite structuregas sensorscreen printingsolid polymer electrolyte

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sensor Technology

Background:

  • Solid polymer electrolytes (SPEs) are crucial components in printed electrochemical gas sensors.
  • Developing advanced SPEs is key to improving sensor performance and value.

Purpose of the Study:

  • To create a new SPE for enhanced electrochemical amperometric nitrogen dioxide sensing.
  • To optimize SPE composition and processing for maximum sensor sensitivity.

Main Methods:

  • Synthesized SPE by immobilizing 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]) in a poly-vinylidene fluoride (PVDF) matrix using 1-methyl-2-pyrrolidone (NMP).
  • Fabricated a two-layer electrochemical sensor by coating the SPE onto an electrode.
  • Investigated sensor performance by reducing nitrogen dioxide at a bias voltage of -500 V.
  • Utilized FTIR, XPS, SEM, and XRD for material characterization and structural analysis.

Main Results:

  • The optimal SPE composition was a 1:1:4 weight ratio of [EMIM][BF4]:NMP:PVDF, coated at 1.25 mm thickness and heat-treated at 80°C for 2 min.
  • Achieved the best sensor sensitivity with this optimized SPE formulation.
  • FTIR and XPS confirmed physical miscibility in SPE formation.
  • SEM and XRD revealed that interconnected pore structure, influenced by synthesis ratio, morphology, and heat treatment, is critical for sensitivity.
  • Sensor sensitivity showed a correlation with SPE conductivity.

Conclusions:

  • The developed SPE, based on [EMIM][BF4], NMP, and PVDF, offers superior performance for electrochemical nitrogen dioxide sensors.
  • Optimized material composition and processing parameters significantly enhance sensor sensitivity.
  • The interconnected pore structure and conductivity of the SPE are key factors determining sensor performance.