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関連する概念動画

Coordination Number and Geometry02:57

Coordination Number and Geometry

19.0K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
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Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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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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The Thoracic Cage: Sternum01:17

The Thoracic Cage: Sternum

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The thoracic or rib cage forms the body's thorax (chest) portion. Its primary function in the body is to protect vital organs in the thoracic cavity, such as the heart and the lungs. It consists of 12 pairs of ribs with their costal cartilages and the sternum. The ribs are anchored posteriorly to the 12 thoracic vertebrae (T1-T12).
The sternum is the elongated bony structure on the anterior side of the thoracic cage. It consists of three parts: the manubrium, the body, and the xiphoid...
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The Thoracic Cage: Ribs01:20

The Thoracic Cage: Ribs

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Ribs are curved, flattened bones forming the thoracic cavity wall with the thoracic muscles. There are 12 pairs of thoracic ribs. The posterior ends of all the ribs articulate with the T1–T12 thoracic vertebrae. In contrast,the anterior ends of most ribs attach to the sternum via their costal cartilages.
Parts of a Typical Rib
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メタンの貯蔵はパドルホイールベースの多孔な調整ケージで

Casey A Rowland, Gregory R Lorzing, Aeri J Gosselin

  • 1Center for Neutron Research , National Institute of Standards and Technology , Gaithersburg , Maryland 20899 , United States.

Journal of the American Chemical Society
|August 21, 2018
PubMed
まとめ

研究者らは カーバゾール基の新型毛細な調整ケージを開発し 記録的な表面積を記録しました これらの材料は,最適化された孔の設計により,高メタン吸収能力を示し,ガスの貯蔵ソリューションを進めている.

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科学分野:

  • 材料科学
  • 化学について
  • ナノテクノロジー

背景:

  • 多孔性物質におけるガスの吸収は,貯蔵と分離に不可欠です.
  • 孔状の調整ケージは,その可能性にもかかわらず,ガス吸着についてはあまり研究されていない.
  • これらの分子システムについては,表面積のデータが欠けていることが多い.

研究 の 目的:

  • カーバゾール基の新型毛細な調整ケージを合成し,特徴づけること.
  • ガス吸収特性,特にメタンの吸収を調査する.
  • 調整ケージの表面積に関する新しい基準を確立する.

主な方法:

  • カーバゾールベースの調整ケージの合成と特徴付け
  • アクティベーションプロトコルは,高い表面積を達成します.
  • 高圧でのガス吸収測定 (Brunauer-Emmett-Teller - BET)
  • 孔の構造分析のための粉末中性子 difraktion.

主要な成果:

  • クロミウムアナログは1235 m2/gの記録的なBET表面積を達成しました.
  • 合成と活性化の最適化により,複数のケージの表面積が高くなった.
  • クロミウムのケージはメタン (CH4) の吸収能力が顕著であった (65バーで194cm3/gと148cm3/cm3).

結論:

  • カーバゾール基の多孔な調整ケージは,ガス貯蔵用として有望である.
  • 合成と活性化の正確な制御は,表面積と吸収を最大化するための鍵です.
  • これらのケージの最適な孔構造はメタンの高吸収につながります.