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関連する概念動画

Structures of Solids02:22

Structures of Solids

Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Structure of Alkanes02:23

Structure of Alkanes

The formation of carbon-carbon bonds leading to the creation of the carbon chain is the basis of organic chemistry. August Kekulé and Archibald Scott Couper independently developed this idea of carbon chain formation.
Hydrocarbons are the simplest organic compounds composed of carbons and hydrogens. Based on the bond order between carbons, the hydrocarbons are further classified into alkanes, alkenes, and alkynes. 
Alkanes are the simplest hydrocarbons with sp3 hybrid carbon atoms. These sp3...
Structure and Bonding of Alkenes02:47

Structure and Bonding of Alkenes

Olefins, which are unsaturated hydrocarbons containing one or more carbon–carbon double bonds, are broadly divided into alkenes and cycloalkenes. The general chemical formula of an alkene is CnH2n.
Doubly bonded carbons are sp2 hybridized and have a trigonal planar geometry. The double bond is composed of a σ bond formed by the overlap of hybrid orbitals and a π bond produced by the lateral overlap of unhybridized 2p orbitals on both the carbons. Each carbon atom is bonded to two hydrogen atoms...
Structure and Physical Properties of Alkynes02:37

Structure and Physical Properties of Alkynes

Introduction:
In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose molecules contain saturated single bonds (i.e., alkanes) or unsaturated double or triple bonds. Alkenes contain carbon–carbon double bonds and have a structural formula CnH2n. Unsaturated hydrocarbons containing carbon–carbon triple bonds are called "alkynes" and are structurally represented by the formula CnH2n-2.
The simplest alkyne is ethyne, or...
Structure of Amines01:19

Structure of Amines

The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’ carbon–carbon bond (154 pm). These aspects are illustrated in Figure...

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関連する実験動画

Updated: Jul 14, 2026

Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
05:50

Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments

Published on: May 11, 2017

水素化アルファ-アル ((2) O ((3) (0001)) 表面の構造

Eng1, Trainor, Brown

  • 1Consortium for Advanced Radiation Sources, The University of Chicago, Chicago, IL 60637, USA. Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305-2115, USA. Stanford Synchrotron Radiation Laboratory, Sta.

Science (New York, N.Y.)
|May 12, 2000
PubMed
まとめ

水素化されたアルファアルミニウム (0001) 表面は酸素末端であり,クリーンでアルミニウム末端の表面とは異なる. この水素化された構造は,酸化アルミニウムの反応性に影響します.

さらに関連する動画

Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte
10:27

Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte

Published on: October 5, 2017

Multiscale Structures Aggregated by Imprinted Nanofibers for Functional Surfaces
06:14

Multiscale Structures Aggregated by Imprinted Nanofibers for Functional Surfaces

Published on: September 11, 2018

関連する実験動画

Last Updated: Jul 14, 2026

Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
05:50

Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments

Published on: May 11, 2017

Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte
10:27

Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte

Published on: October 5, 2017

Multiscale Structures Aggregated by Imprinted Nanofibers for Functional Surfaces
06:14

Multiscale Structures Aggregated by Imprinted Nanofibers for Functional Surfaces

Published on: September 11, 2018

科学分野:

  • 表面科学とは,地表科学のことである.
  • 材料科学は材料科学である.
  • 化学 化学は化学です.

背景:

  • 酸化アルミニウムの表面の物理的,化学的性質は,その反応性を理解するために重要である.
  • アルファ-アル ((2) O ((3) (0001)) 表面の水の存在における振る舞いは,そのアプリケーションの鍵です.

研究 の 目的:

  • 水素化されたアルファ-Al(2) O(3) (0001) 表面の原子構造を決定する.
  • 水素化された表面構造とクリーンな表面構造を比較する.

主な方法:

  • シンクロトロンX線放射線を用いた結晶断片棒 difraktion.
  • 300ケルビンで水蒸気下でのインシット表面分析.

主要な成果:

  • 水素化されたalpha-Al(2)O(3) (0001) 表面は,下部に収縮したアルミニウム層と酸素末端があります.
  • 吸収された水層は,表面から約2.3アングストロムの高さで特定されました.
  • 水素化された構造は,アルファ-アル2O3とガンマ-アル3OH3の間の中間体です.
  • クリーンなalpha-Al(2)O(3) (0001) 表面はアルミニウムで締め付けられ,リラックスされています.

結論:

  • 水素化およびクリーンなalpha-Al(2) O(3) (0001) 表面は,異なる構造を示しています.
  • これらの構造的差異は,クリーンなアルミニウム酸化物表面と,水酸化アルミニウム酸化物表面の異なる反応性を説明します.