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Formal Charges02:42

Formal Charges

40.7K
In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used to help predict the most appropriate Lewis structure when more than one reasonable structure exists.
40.7K
Storage01:23

Storage

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A schema is a mental framework that helps individuals organize and interpret information. Schemata, formed from previous experiences, influence how we process new information: how we encode it, the inferences we make, and how we retrieve it. For instance, a schema for what a typical classroom looks like might include desks, a teacher's desk, a whiteboard, and students in such an environment. This expectation helps us quickly understand and navigate new classrooms without needing to analyze...
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Protein-protein Interfaces02:04

Protein-protein Interfaces

14.8K
Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Ions and Ionic Charges03:27

Ions and Ionic Charges

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In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
79.5K
Water and Mineral Acquisition02:34

Water and Mineral Acquisition

35.9K
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
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Atomic Radii and Effective Nuclear Charge03:08

Atomic Radii and Effective Nuclear Charge

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The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
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Updated: Feb 14, 2026

Hydrogen Charging of Aluminum using Friction in Water
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Hydrogen Charging of Aluminum using Friction in Water

Published on: January 28, 2020

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表面形態学は,電動化されたPt-水インターフェイスで充電貯蔵を制御します.

Matthew T Darby1, Muhammad Saleh2, Marialore Sulpizi2

  • 1Department of Chemistry and Thomas Young Centre, Molecular Sciences Research Hub, Imperial College London, London W12 0BZ, United Kingdom.

The Journal of chemical physics
|February 13, 2026
PubMed
まとめ

プラチナ製のステップエッジは,電気触媒の鍵ですが,よく理解されていません. この研究は,ステップエッジが正電荷を蓄積し,平らな表面とは異なり,反応性を高め,触媒設計のための新しい洞察を提供することを明らかにしています.

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Preparation of Free-Surface Hyperbolic Water Vortices
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Controlled-release of Chlorine Dioxide in a Perforated Packaging System to Extend the Storage Life and Improve the Safety of Grape Tomatoes
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Controlled-release of Chlorine Dioxide in a Perforated Packaging System to Extend the Storage Life and Improve the Safety of Grape Tomatoes

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関連する実験動画

Last Updated: Feb 14, 2026

Hydrogen Charging of Aluminum using Friction in Water
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Hydrogen Charging of Aluminum using Friction in Water

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Preparation of Free-Surface Hyperbolic Water Vortices
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Controlled-release of Chlorine Dioxide in a Perforated Packaging System to Extend the Storage Life and Improve the Safety of Grape Tomatoes
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科学分野:

  • 表面科学とは,地表科学である.
  • エレクトロカタリシス.
  • コンピューティング・ケミストリー

背景:

  • プラチナ製のステップエッジは,燃料電池や電解剤の電気触媒反応に不可欠です.
  • これらのステップエッジにおける正確な原子的電気化学的行動はよく理解されていません.
  • ナノ構造のプラチナ表面は,効率的な触媒に不可欠です.

研究 の 目的:

  • プラチナのステップエッジのサイト固有の電気化学的振る舞いを調査するために.
  • ナノ構造のPt表面における電気二重層の構造,電荷分布,および静電学を解明する.
  • プラチナの電気触媒におけるステップエッジの役割のメカニズム的説明を提供すること.

主な方法:

  • 制御された電極電位下でのアビニシオ分子動力学シミュレーション.
  • 観測されたエッジモチーフ ((111) × (111) と (111) × (100)) を含む現実的な段階的なPt-水インターフェースのモデリング.
  • 空間的に解明されたマクロスコーピックポテンシャルプロファイルの分析.

主要な成果:

  • ゼロ電荷ポテンシャル (PZC) 近くの差電容は, (111) のテラスでの水化学吸収によって支配されています.
  • ステップエッジはPZC以下の化学吸収水で飽和しており,容量に寄与しません.
  • ステップエッジは余分な正電荷を蓄積し,局所静電ポテンシャルが高くなり,電荷の局所化と反応性が向上します.

結論:

  • ステップエッジは,独自の静電特性により,正電荷のアクティブセンターとして機能します.
  • この電気静的非対称性は,ステップサイトでの反応性の強化を説明する.
  • この発見は,ナノ構造のプラチナ電触媒の最適化のための枠組みを確立しています.