Video Experimental Relacionado
Updated: Feb 7, 2026
10:33
An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
Published on: February 27, 2019
9.0K
Dopante quiral reactivo al redox para la modulación electroquímica rápida del color de los cristales líquidos de
Shoichi Tokunaga1, Yoshimitsu Itoh1, Hiroyuki Tanaka1
1Department of Chemistry and Biotechnology, School of Engineering , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 113-8656 , Japan.
Journal of the American Chemical Society
|August 3, 2018
Resumen
Los investigadores desarrollaron un nuevo dopante quiral redox-activo que sintoniza eléctricamente el color del cristal líquido. Este avance permite un cambio de color rápido y de baja tensión en pantallas de cristal líquido colestérico.
Área de la Ciencia:
- Ciencias de los materiales
- Química orgánica
- La electroquímica
Sus antecedentes:
- Los cristales líquidos colestéricos (LC) exhiben propiedades ópticas únicas basadas en su estructura helicoidal.
- El control de la potencia de torsión helicoidal (HTP) de los dopantes es crucial para ajustar el color LC.
- Los métodos existentes para la modulación eléctrica del color en LC a menudo sufren de tiempos de respuesta lentos o altos voltajes de funcionamiento.
Objetivo del estudio:
- Introducir el primer dopante quiral redox activo, FcD, capaz de modular eléctricamente su HTP.
- Para demostrar el cambio de color electroquímico rápido y reversible de un medio LC colestérico dopado con FcD.
- Evaluar el rendimiento de este sistema en términos de tiempo de respuesta y tensión de funcionamiento.
Principales métodos:
- Síntesis de FcD, combinando una unidad de binaftil axialmente quiral con una unidad de ferroceno redox-activo.
- Dopando un LC colestérico (4'-pentiloxi-4-cianobifenilo) con FcD y observando cambios de color al momento de la oxidación.
- Modulación electroquímica del color de reflexión mediante una célula de vidrio tipo sandwich con electrodos de óxido de indio y estaño.
Principales resultados:
- El dopante FcD sintetizado indujo con éxito un color de reflexión azul en el LC colestérico.
- La oxidación de FcD con tetrafluoroborato de nitrosilo disminuyó su HTP en un 13%, cambiando el color a verde.
- El control electroquímico logró un cambio de color de azul a verde en 0,4 s a +1,5 V, volviendo al azul a 0 V.
Conclusiones:
- Fc D es el primer dopante quiral redox activo reportado que sintoniza eléctricamente el color HTP y LC.
- El sistema colestérico LC dopado con Fc exhibe la respuesta electroquímica más rápida y el voltaje de funcionamiento más bajo hasta la fecha para dispositivos LC accionados eléctricamente.
- Este trabajo abre nuevas vías para el desarrollo de materiales y pantallas electrocrómicas avanzadas.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:26What is an Electrochemical Gradient?
128.1K
Adenosine triphosphate, or ATP, is considered the primary energy source in cells. However, energy can also be stored in the electrochemical gradient of an ion across the plasma membrane, which is determined by two factors: its chemical and electrical gradients.
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
128.1K
02:58Balancing Redox Equations
62.2K
Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
62.2K
01:24Redox Reactions
58.8K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
58.8K
01:27Redox Reactions
1.1K
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
1.1K
02:25Chirality
29.6K
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
29.6K
03:02Colors and Magnetism
14.1K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.1K