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関連する概念動画

Valence Bond Theory02:42

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...
Colors and Magnetism03:02

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.
Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Published on: August 10, 2017

コア・シェル構造の磁性三元ナノキューブ

Lingyan Wang1, Xin Wang, Jin Luo

  • 1Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States.

Journal of the American Chemical Society
|December 3, 2010
PubMed
まとめ

研究者らは,マンガン亜鉛フェライトを使用して,新しいコアシェル磁性ナノキューブを合成しました. これらのナノ粒子にはユニークな磁気特性があり,高度な応用のために原子レベルで精密な制御を提供します.

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Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering
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Synthesizing Sodium Tungstate and Sodium Molybdate Microcapsules via Bacterial Mineral Excretion
08:53

Synthesizing Sodium Tungstate and Sodium Molybdate Microcapsules via Bacterial Mineral Excretion

Published on: January 30, 2018

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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering
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Synthesizing Sodium Tungstate and Sodium Molybdate Microcapsules via Bacterial Mineral Excretion
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Synthesizing Sodium Tungstate and Sodium Molybdate Microcapsules via Bacterial Mineral Excretion

Published on: January 30, 2018

科学分野:

  • マテリアルサイエンス 材料科学
  • ナノテクノロジー ナノテクノロジー
  • マグネチズム (磁気) とは

背景:

  • フェライトナノ粒子は,様々な用途において極めて重要です.
  • ナノ粒子の構造と磁気特性を制御することは,大変な課題です.
  • 既存の合成方法は,しばしば還元剤に依存しています.

研究 の 目的:

  • マンガン亜鉛フェライトの新型コアシェル構造の三元ナノキューブを合成する.
  • これらのエンジニアリングされたナノ粒子の構造的および磁性特性を調査するために.
  • 構造制御によるナノスケール磁気特性の微調整の可能性を調査する.

主な方法:

  • 反応温度と組成を制御することによって,MnZnフェライトコアシェルナノキューブの合成.
  • モイレパターンを観察する技術を用いた特徴付けで,結晶構造を示しています.
  • 強制力とフィールド冷却/ゼロフィールド冷却の振る舞いを含む磁気特性の分析.

主要な成果:

  • Fe(3) O(4) のコアとMnZnフェライトの殻を持つ,高度に単分散したコアシェルのナノキューブを合成しました.
  • モイレのパターンを観測し,軽微な格子不一致でコアとシェルの高度な結晶性を確認しました.
  • 通常のナノ粒子と比較して,強引性の増加と異なるフィールド冷却/ゼロフィールド冷却の特徴を含むユニークな磁性特性を実証しました.

結論:

  • この新しい合成アプローチにより,精密に設計された三元磁性ナノ粒子を作成することができます.
  • コア・シェルの構造と組成は,磁気特性に大きく影響する.
  • この研究は,ナノスケールの磁気特性を原子レベルで制御する経路を提供し,適用可能なアプリケーションに合わせます.