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Related Concept Videos

Ionic Radii03:10

Ionic Radii

33.5K
Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
33.5K
Ionic Bonds00:42

Ionic Bonds

130.7K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
130.7K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

20.1K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
20.1K
Ionic Compounds: Formulas and Nomenclature03:34

Ionic Compounds: Formulas and Nomenclature

87.2K
An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
87.2K
Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

68.2K
Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
68.2K
Ionic Crystal Structures02:42

Ionic Crystal Structures

17.0K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Extremely Deformable, Transparent, and High-Performance Gas Sensor Based on Ionic Conductive Hydrogel.

Jin Wu1, Zixuan Wu1, Songjia Han1

  • 1State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology , Sun Yat-sen University , Guangzhou 510275 , China.

ACS Applied Materials & Interfaces
|January 1, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed highly stretchable and transparent gas sensors using ionic conductive hydrogels for wearable applications. These sensors show high sensitivity and stability for detecting nitrogen dioxide (NO2) and ammonia (NH3).

Keywords:
double-network hydrogelgas sensorstretchabletransparentwater retention

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sensor Technology

Background:

  • Stretchable chemical sensors are crucial for wearable environmental monitoring and healthcare.
  • Existing sensors often lack the durability and sensitivity required for demanding applications.

Purpose of the Study:

  • To fabricate ultrastretchable and transparent gas sensors using novel ionic conductive hydrogels.
  • To investigate the gas-sensing performance of these hydrogels for nitrogen dioxide (NO2) and ammonia (NH3).

Main Methods:

  • Fabrication of polyacrylamide/carrageenan double-network (DN) hydrogels.
  • Development of a solvent replacement strategy using glycerol (Gly) to enhance sensor properties.
  • Testing sensor performance under various mechanical deformations and gas exposures.

Main Results:

  • Achieved high sensitivity (78.5 ppm^-1) and low detection limit (1.2 ppb) for NO2 detection.
  • Demonstrated ultrastretchability (up to 1200% strain) and mechanical robustness without performance degradation.
  • Enhanced NO2 sensitivity by 1.68 times and improved sensor stability for up to 9 months using a water-Gly binary hydrogel.

Conclusions:

  • Ionic conductive hydrogels are promising materials for designing highly deformable and sensitive gas sensors.
  • The developed DN-Gly hydrogel sensors offer a stable and effective solution for wearable gas detection.
  • The findings pave the way for advanced wearable environmental and health monitoring systems.