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相关概念视频

Electron Transport Chains01:28

Electron Transport Chains

The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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.
Radical Autoxidation01:20

Radical Autoxidation

The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...

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相关实验视频

Updated: Jul 11, 2026

Photopatterning Proteins and Cells in Aqueous Environment Using TiO2 Photocatalysis
10:26

Photopatterning Proteins and Cells in Aqueous Environment Using TiO2 Photocatalysis

Published on: October 26, 2015

电子诱导的氧气从TiO2(011)-2x1表面脱落导致了自我组织的空缺.

Olga Dulub1, Matthias Batzilln, Sergey Solovev

  • 1Department of Physics, Tulane University, New Orleans, LA 70118, USA.

Science (New York, N.Y.)
|August 25, 2007
PubMed
概括
此摘要是机器生成的。

对二氧化表面的电子辐射会导致氧气脱吸. 这一过程产生氧气空缺,然后减少邻近地点的进一步脱吸,形成有序空缺阵列.

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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate
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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate

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The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance
11:47

The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance

Published on: July 4, 2017

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Photopatterning Proteins and Cells in Aqueous Environment Using TiO2 Photocatalysis
10:26

Photopatterning Proteins and Cells in Aqueous Environment Using TiO2 Photocatalysis

Published on: October 26, 2015

Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate
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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate

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The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance
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The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance

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科学领域:

  • 表面科学是一门科学.
  • 材料科学是一种材料科学.
  • 纳米技术纳米技术

背景情况:

  • 低能电子与表面的相互作用可以诱导化学变化.
  • 二氧化 (TiO2) 是催化和电子学的关键材料.
  • 了解电子诱导的表面变化是先进材料应用的关键.

研究的目的:

  • 研究由低能电子诱导的TiO2表面氧气脱吸的机制.
  • 量化溶解截面,并分析氧气空缺的形成.
  • 探索现有氧气空缺对后续脱氧事件的影响.

主要方法:

  • 用300 eV电子对一个TiO2(011)-2x1表面进行辐射.
  • 使用扫描道显微镜 (STM) 分析诱导的氧气空缺.
  • 测量原始和空置受影响场所的脱吸截面.

主要成果:

  • 从原始的TiO2表面吸收氧气的截面被确定为9 (+/-6) x 10^-17 cm^2.2.
  • 电子激发有效地转换为原子运动,导致氧气空隙的形成.
  • 以前存在的氧气空缺显著降低了相邻的氧气原子的脱吸概率 (最近的邻居是100倍,最近的邻居是10倍).

结论:

  • 特定位置的电子刺激脱吸导致TiO2表面上形成一维的氧空位阵列.
  • 观察到的脱横截面的减少突出显示了自我限制或排序机制.
  • 这种受控的空位形成可以被利用用于纳米尺寸的表面图案和功能化.