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Related Concept Videos

Ion Exchange01:17

Ion Exchange

1.1K
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...
1.1K
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

1.7K
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
1.7K
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

1.5K
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
1.5K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.9K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.5K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.5K

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Updated: Jan 5, 2026

Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
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Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes

Published on: January 30, 2015

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Rectification Behavior on Polyelectrolyte-Modified Flexible ITO Electrode via Ionic Charge-Selective Electron

Bingchen Li1, Xuxian Zhao1, Zhe Sun1

  • 1Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, Department of Applied Chemistry , Tianjin University of Technology , No. 391 Binshui Xidao , Xiqing District Tianjin 300384 , P. R. China.

ACS Applied Materials & Interfaces
|October 16, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel flexible diode by combining ionic and molecular properties. This system uses redox species on modified electrodes, achieving current rectification for advanced electronic applications.

Keywords:
charge-selective electrodecurrent rectificationdirect electron transferflexibleionic redox species

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Patterning Cells on Optically Transparent Indium Tin Oxide Electrodes
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Patterning Cells on Optically Transparent Indium Tin Oxide Electrodes
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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Molecular and ionic diodes offer potential for downscaled electronic devices, ionic circuits, and biological systems.
  • Existing diode types face limitations, motivating the development of improved, scalable systems.
  • Current rectification is crucial for electronic device functionality.

Purpose of the Study:

  • To propose a novel system integrating advantages of ionic and single-molecule diodes while mitigating their disadvantages.
  • To demonstrate a simple, scalable method for creating flexible current rectification devices.
  • To investigate ionic charge-selective electron transfer for rectification behavior.

Main Methods:

  • Fabrication of flexible current rectification devices using polyelectrolyte multilayer (PEM)-modified indium tin oxide (ITO) electrodes.
  • Utilizing an electrolytic solution containing redox species, specifically ferrocyanide (Fe(CN)63-) and hexaamineruthenium(III) (Ru(NH3)63+).
  • Formation of an ionic bilayer on a charge-selective ITO surface via Coulombic interactions, mimicking a molecular diode's monolayer.

Main Results:

  • The proposed system exhibits rectification behavior driven by ionic charge-selective electron transfer.
  • Flexible diodes were successfully prepared using bare and PEM-modified plastic ITO electrodes.
  • Rectification ratio (RR) was enhanced from approximately 6 to 10 by incorporating conducting polymers into the PEMs.

Conclusions:

  • The study presents a promising system that merges ionic and molecular diode functionalities.
  • The developed method offers a simple and scalable approach to flexible electronic devices.
  • Enhanced rectification ratios were achieved through tailored PEM construction, paving the way for advanced applications.