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Redox Reactions01:24

Redox Reactions

50.9K
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...
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Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

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Oxidation–Reduction Reactions
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Oxidation Numbers03:14

Oxidation Numbers

33.6K
In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.
33.6K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

46.7K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.5K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.5K
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

117
Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
117

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関連する実験動画

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Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
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コロイドのReO3ナノ結晶:プラズモンの反応を誘発する余分なRed電子

Sandeep Ghosh1, Hsin-Che Lu1, Shin Hum Cho1

  • 1McKetta Department of Chemical Engineering , The University of Texas at Austin , Austin , Texas 78712-1589 , United States.

Journal of the American Chemical Society
|September 20, 2019
PubMed
まとめ

新しい熱注入法を使って 酸化レニウム (ReO3) のナノ結晶を合成しました これらのプラズモンのナノ結晶は,電気化学的なイオン挿入により,ダイナミックな光学変調を示し,材料科学の応用のための新しい道を開きます.

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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation

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Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination
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Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination

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関連する実験動画

Last Updated: May 6, 2026

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation

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Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination
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科学分野:

  • 材料科学
  • ナノテクノロジー
  • 物理化学

背景:

  • レニウム酸化物 (ReO3) は金属特性を持ち,ナノ結晶の表面プラズモン共鳴 (LSPR) を可能にします.
  • 現存する金属酸化ナノ結晶の合成方法は,溶媒互換性のための複雑なリガンド交換手順を伴うことが多い.

研究 の 目的:

  • ReO3ナノ結晶 (NC) の新しいコロイド合成経路を開発する.
  • これらのReO3NCのプラズモニック特性と光学変調能力を調査する.

主な方法:

  • 熱注入経路によるReO3NCのコロイド合成で,長鎖エーテルでRe(+7) オキシードを還元する.
  • ミエ理論シミュレーションとドリュードモデリングを使用して光学特性を分析する.
  • ダイナミックな光学変調を誘導するためにイオン (de) 挿入による電気化学的充電.

主要な成果:

  • ReO3NCをエーテルとヒドロキシル表面リガンドで合成し,溶媒のスイッチングを容易にした.
  • 590nm周辺のLSPR帯と410nmのインターバンド吸収の観測
  • ReO3NCフィルムの電気化学的イオン挿入/脱入による可逆的ダイナミック光学変調の実証.

結論:

  • 新しい合成プロトコルは,調節可能なプラズモニック特性を有するReO3NCを生成する.
  • 電気化学的イオン挿入は,ReO3NCフィルムのダイナミックな光学変調を可能にするが,この現象は大量ReO3では観測されない.
  • この研究は,ReO3ナノ結晶のプラズモニックアプリケーションのさらなる探索を容易にする.