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Related Concept Videos

Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
Types of Reversible Electrodes01:24

Types of Reversible Electrodes

For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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.
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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 the...

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Related Experiment Video

Updated: Jun 16, 2026

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
10:33

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

Published on: February 27, 2019

Cylindrical, Ring-Electrode KD*P Electrooptic Modulator.

L L Steinmetz, T W Pouliot, B C Johnson

    Applied Optics
    |February 4, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new electrooptic cell design using Z-cut potassium dideuterium phosphate (KD*P) offers superior transmission uniformity and subnanosecond switching. This innovative ring-electrode geometry significantly enhances performance over conventional designs.

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    Published on: August 7, 2018

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    An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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    05:47

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    Published on: August 7, 2018

    Area of Science:

    • Optoelectronics
    • Materials Science
    • Applied Physics

    Background:

    • Electrooptic cells are crucial components in various optical systems.
    • Conventional designs often face limitations in transmission uniformity and switching speed.
    • Potassium dideuterium phosphate (KD*P) is a widely used electrooptic material.

    Purpose of the Study:

    • To develop a novel electrooptic cell with enhanced performance.
    • To investigate the impact of a ring-electrode geometry on KD*P crystal performance.
    • To achieve high transmission uniformity and subnanosecond switching capabilities.

    Main Methods:

    • Fabrication of an electrooptic cell utilizing a cylindrical Z-cut KD*P crystal.
    • Implementation of a ring-electrode geometry for voltage application.
    • Theoretical analysis and experimental validation of cell performance.

    Main Results:

    • The developed cell exhibits high transmission uniformity across the aperture.
    • Subnanosecond switching capability was demonstrated.
    • An order-of-magnitude improvement in transmission uniformity was observed compared to conventional designs.
    • Enhanced switching speed was achieved.

    Conclusions:

    • The ring-electrode geometry in Z-cut KD*P electrooptic cells significantly improves transmission uniformity.
    • The new cell design offers superior switching speeds, making it suitable for high-speed optical applications.
    • This development represents a substantial advancement in electrooptic device technology.