Video Experimental Relacionado
Updated: Jul 11, 2026
09:11
Alternating Magnetic Field-Responsive Hybrid Gelatin Microgels for Controlled Drug Release
Published on: February 13, 2016
10.4K
Hidrogel de transferencia de carga multiestimulador para dispositivos de película delgada ferroeléctricos orgánicos a
Makam Pandeeswar1, Satyaprasad P Senanayak1, K S Narayan1
1Bioorganic Chemistry Laboratory, New Chemistry Unit, and ‡Molecular Electronics Lab, Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research , Jakkur P.O., Bengaluru 560064, India.
Journal of the American Chemical Society
|June 16, 2016
Resumen
Los investigadores desarrollaron nuevos materiales ferroeléctricos supramoleculares a partir de moléculas aromáticas. Estos materiales de película delgada exhiben polarización espontánea y pueden usarse en dispositivos de memoria de múltiples estados, avanzando la electrónica orgánica.
Área de la Ciencia:
- Química supramolecular
- Ciencias de los materiales
- Productos electrónicos orgánicos
Sus antecedentes:
- La polarización ferroeléctrica se observa típicamente en cristales simples de baja masa molecular.
- Los materiales ferroeléctricos supramoleculares sensibles a los estímulos, de película delgada y procesables en solución son escasos.
- El avance de la química supramolecular requiere materiales programables con polarización espontánea.
Objetivo del estudio:
- Introducir nuevos sistemas moleculares de donantes y aceptadores de electrones π aromáticos.
- Demostrar materiales ferroeléctricos supramoleculares de película delgada y sensibles a los estímulos.
- Para explorar el diseño de dispositivos de memoria de película delgada multiestado.
Principales métodos:
- Utilizando sistemas moleculares de donante y receptor de electrones π aromáticos.
- Utilizando el coensamblaje de transferencia de carga (CT) quiral supramolecular de pila mixta a través de un proceso de pinza-inclución-sándwich.
- Aprovechando las interacciones de enlace de hidrógeno para la sinergia estructural.
Principales resultados:
- Se ha logrado una polarización macroscópica unidireccional espontánea en una red de hidrogel nanofibroso cristalino en condiciones ambientales.
- Se ha demostrado la compatibilidad de las interacciones con estímulos ópticos, mecánicos, térmicos y eléctricos.
- Dispositivos de memoria de película delgada de varios estados diseñados con éxito.
Conclusiones:
- El motivo supramolecular desarrollado permite la creación de películas delgadas ferroeléctricas sensibles a los estímulos.
- La estrategia facilita el diseño de dispositivos electrónicos orgánicos inteligentes multicomponentes.
- Este trabajo amplía la utilidad de la química supramolecular para materiales avanzados.
Videos de Conceptos Relacionados
01:20Preparation of Samples for Electron Microscopy
To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
01:15Potentiometry: 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...
01:06Coagulation
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
01:29Electrical Transport
The electrical transport property of a material is defined by its resistance and conductivity. Resistance is the measure of a material's ability to resist the flow of electric current, while conductivity gauges its ability to allow the current to pass through, depending on the geometry of the measurement cell, such as electrode spacing and area. Conductivity is measured in Siemens (S). There are different types of conductance, including specific conductance, equivalent conductance, and molar...
01:24Electrochemical Systems
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...