Related Experiment Video
Updated: Apr 20, 2026
05:33
Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
22.5K
Ion transport and softening in a polymerized ionic liquid.
Rajeev Kumar1, Vera Bocharova, Evgheni Strelcov
1Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, TN-37831, USA. kumarr@ornl.gov.
Nanoscale
|December 3, 2014
Summary
Polymerized ionic liquids (PolyILs) show promise for electronics. Applying electric fields softens PolyILs and causes hole formation, linked to ion dissociation and glass transition temperature changes.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Polymerized ionic liquids (PolyILs) are key materials for solid-state electronic devices.
- A complete understanding of the relationship between ionic transport and mechanical properties in PolyILs is lacking.
Purpose of the Study:
- To investigate the interplay between local charge transport and structural modifications in PolyIL films.
- To elucidate the mechanisms behind observed mechanical property changes under applied electric fields.
Main Methods:
- Utilized an integrated experimental and theoretical approach.
- Applied Onsager's theory of the Wien effect and Poisson-Nernst-Planck formalism.
- Employed scanning probe microscopy (SPM) to observe structural changes.
Main Results:
- Experimental charging kinetics and current-voltage data align with the Wien effect and charge transport models.
- Significant softening of PolyIL films observed above threshold voltages.
- Formation of holes in PolyIL films under applied electric fields.
Conclusions:
- The Wien effect and charge transport formalism accurately predict PolyIL behavior.
- Softening is attributed to a depression in glass transition temperature due to increased ion dissociation.
- Electric field-induced structural changes are predictable and linked to ionic behavior.
Related Concept Videos
01:17Ion Exchange
1.6K
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...
1.6K
01:29The Colloidal State
167
The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
167
01:31Transport Number
194
The transport number is the fraction of the total current carried by an ion in an electrolyte solution. It is defined as the ratio of the current carried by a specific ion to the total current flowing through the solution. The transport number, t, is central to understanding ionic mobility, which describes how fast an ion moves under the influence of an electric field. This link connects the physical behavior of ions in solution to the chemical processes that occur during electrochemical...
194
01:17Pore Transport and Ion-Pair Transport
1.6K
Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
1.6K
01:20Anionic Chain-Growth Polymerization: Overview
2.8K
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,...
2.8K
00:57Cationic Chain-Growth Polymerization: Mechanism
3.1K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
3.1K