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Diamagnetism

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.

Intermolecular Forces

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...

Intermolecular Forces

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...

Colors and Magnetism

Colors and Magnetism

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 eye.

Valence Bond Theory

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

Van der Waals Interactions

Van der Waals Interactions

Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.

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Gold Nanoparticle Synthesis

Gold Nanoparticle Synthesis

Published on: July 10, 2021

Las interacciones dipolares magnéticas en el oro sólido nanosphere dimers de oro sólido.

Manabendra Chandra¹, Anne-Marie Dowgiallo, Kenneth L Knappenberger

¹Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States.

Journal of the American Chemical Society

|March 2, 2012

Resumen

Los investigadores observaron un efecto dipolar magnético en las nanoestructuras de oro, revelando quiralidad en su respuesta óptica no lineal. Este hallazgo avanza en la comprensión de las propiedades plasmónicas en nanomateriales.

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Área de la Ciencia:

Las plasmónicas plasmónicas.
La nanofotónica es la nanofotónica.
La óptica no lineal es la óptica no lineal.

Sus antecedentes:

Las nanoestructuras de metal coloidal exhiben propiedades ópticas únicas debido a las resonancias plasmónicas superficiales.
Las respuestas ópticas no lineales (NLO) son cruciales para las aplicaciones en fotónica y optoelectrónica.
Comprender el origen de las respuestas NLO en las nanoestructuras es clave para su avance tecnológico.

Objetivo del estudio:

Para investigar la respuesta óptica no lineal (NLO, por sus siglas en inglés) de cada uno de los nanosferas de oro sólido (SGN, por sus siglas en inglés).
Para identificar las contribuciones de los efectos dipolares magnéticos a la respuesta NLO de segundo orden.
Para explorar la quiralidad del campo plasmónico dentro de la brecha interpartícula de los dímeros SGN.

Principales métodos:

Fabricación de dímeros SGN utilizando un enfoque de abajo hacia arriba.
Espectroscopia de segunda generación armónica (SHG) con resolución de polarización a nivel de una sola partícula.
Análisis de las formas de la línea de polarización de la señal SH a través de la variación de polarización continua.

Principales resultados:

Observación de la contribución de un dipolo magnético a la respuesta NLO de las nanoestructuras de metal coloidal.
Detección de dicroísmo circular inequívoco en la señal SH de los dímeros SGN.
Identificación de campos quirales de plasmones dentro de la brecha entre partículas de los nanodímetros.

Conclusiones:

El estudio presenta la primera observación de las contribuciones de los dipolos magnéticos a la respuesta NLO en las nanoestructuras de metal coloidal.
El dicroísmo circular observado indica quiralidad en el campo plasmónico, impulsado por los efectos del dipolo magnético.
Estos hallazgos mejoran la comprensión de las propiedades ópticas y las aplicaciones potenciales de las nanoestructuras plasmónicas.