Related Experiment Video
Updated: Feb 8, 2026
10:42
Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
Published on: August 10, 2016
19.0K
Ionic liquids on optical sensors for gaseous carbon dioxide
M D Fernández-Ramos1, M L Aguayo-López2, I Pérez de Vargas-Sansalvador2
1ECsens. Department of Analytical Chemistry, University of Granada, 18071, Granada, Spain. mdframos@ugr.es.
Analytical and Bioanalytical Chemistry
|July 6, 2018
Summary
Ionic liquids (ILs) enhance dry membranes for carbon dioxide (CO2) optical sensing, significantly improving sensor stability, response times, and lifespan. This advancement offers potential for improved CO2 monitoring in applications like food packaging.
Area of Science:
- Materials Science
- Chemical Sensing
- Analytical Chemistry
Background:
- Dry membranes are crucial for gaseous CO2 optical sensing.
- Sensor stability and dynamic behavior are common limitations in current CO2 sensors.
- Ionic liquids (ILs) are explored for their potential to enhance membrane properties.
Purpose of the Study:
- To investigate the impact of eight different ionic liquids (ILs) on the performance of dry membranes for CO2 optical sensing.
- To evaluate the effect of ILs on membrane stability, response/recovery times, and overall sensor lifespan.
- To explore a luminophore-free sensing membrane for colorimetric CO2 detection using digital imaging.
Main Methods:
- Preparation and characterization of dry membranes incorporating eight distinct ionic liquids.
- Optical sensing methodology based on CO2-induced displacement of a pH indicator and inner filter effect on a luminophore.
- Comparative analysis of sensor performance metrics (response time, recovery time, stability, lifespan) with and without ILs.
Main Results:
- Ionic liquids significantly improved the stability and dynamic behavior of the CO2 sensing membranes.
- Response times were reduced to as low as 10 seconds (compared to 41 seconds without ILs), and recovery times to 48 seconds (compared to 100 seconds).
- The useful life of IL-containing membranes extended to at least 292 days, a substantial improvement over IL-free membranes.
Conclusions:
- Ionic liquids are effective in enhancing the performance and durability of dry membranes for CO2 optical sensing.
- The developed IL-enhanced membranes offer faster response and recovery, increased stability, and longer operational life.
- A simplified colorimetric sensor for CO2 detection, suitable for food packaging applications, was demonstrated.
Related Concept Videos
01:28Carbon-dioxide Fixation
729
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
729
01:19Carbon Dioxide Transport in the Blood
5.2K
Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
Forms of CO2 Transport
1. Dissolved in plasma: A small percentage (7-10%) of CO2 is transported and dissolved directly in the plasma.
2. Carbaminohemoglobin: Just over 20% of CO2 is chemically bound to...
Forms of CO2 Transport
1. Dissolved in plasma: A small percentage (7-10%) of CO2 is transported and dissolved directly in the plasma.
2. Carbaminohemoglobin: Just over 20% of CO2 is chemically bound to...
5.2K
02:15Homogeneous Equilibria for Gaseous Reactions
29.3K
Homogeneous Equilibria for Gaseous Reactions
For gas-phase reactions, the equilibrium constant may be expressed in terms of either the molar concentrations (Kc) or partial pressures (Kp) of the reactants and products. A relation between these two K values may be simply derived from the ideal gas equation and the definition of molarity. According to the ideal gas equation:
For gas-phase reactions, the equilibrium constant may be expressed in terms of either the molar concentrations (Kc) or partial pressures (Kp) of the reactants and products. A relation between these two K values may be simply derived from the ideal gas equation and the definition of molarity. According to the ideal gas equation:
29.3K
02:54Molecular and Ionic Solids
20.2K
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...
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...
20.2K
03:10Ionic Radii
33.6K
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...
33.6K
00:42Ionic Bonds
131.3K
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...
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...
131.3K