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相关概念视频

Atomic Structure01:33

Atomic Structure

Overview
Subatomic Particles03:37

Subatomic Particles

Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom.
Nuclear Stability03:18

Nuclear Stability

Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together in the...
Electronic Structure of Atoms02:28

Electronic Structure of Atoms


An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum numbers:  n, l, ml, and...
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Atomic Structure01:17

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The Greek philosopher Democritus proposed that everything on Earth is made up of tiny particles called atomos, Greek for "indivisible," from which the modern term "atom" is derived. In the 19th century, John Dalton proposed the atomic theory that is still largely correct today. He put forth five postulates to explain how atoms made up the world around us. (1) All matter is composed of infinitely small particles or atoms. (2) All atoms of a given element are identical to one another and (3) are...

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具有精确结构的单原子催化剂的单壁集群纳米管

Zhong Li1, Yunwei Huang1, Haoyang Li1

  • 1Engineering Research Center of Advanced Rare Earth Materials, Department of Chemistry, Tsinghua University, Beijing 100084, China.

Journal of the American Chemical Society
|December 27, 2023
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概括

研究人员从多氧金属集群中创建了新的单壁纳米管,使得精确的单原子催化剂 (SAC) 设计成为可能. 这些先进的SAC显示了化学反应的显著增强的催化活性.

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科学领域:

  • 材料科学
  • 纳米技术
  • 催化剂

背景情况:

  • 高性能单原子催化剂 (SAC) 对于有效的化学转化至关重要.
  • 设计具有孤立原子位点的纳米结构是开发先进SAC的关键策略.
  • 聚氧甲 (POM) 集群为催化剂设计提供独特的结构和电子特性.

研究的目的:

  • 构建具有原子精确结构的基于聚氧金属的单壁纳米管 (POM-SWNT).
  • 将孤立的金属中心 (Cu,Pt) 纳入这些POM-SWNT支,以创建新的SAC.
  • 评估合成的SAC的催化性能和稳定性.

主要方法:

  • 使用缺陷的POM集群 (PW11和P2W17) 合成POM-SWNT.
  • 将金属中心 (M = Cu, Pt) 纳入POM-SWNT,形成MPW11-SWNT和MP2W17-SWNT.
  • 使用分子动力学模拟进行结构特征和稳定性评估.
  • 在二甲基基的醇化中对催化活性进行评估.

主要成果:

  • 成功合成了具有均直径和单壁厚度的原子精确POM-SWNT.
  • 通过分子动力学模拟证实了POM-SWNT的稳定性.
  • 嵌入Pt的P2W17-SWNTs (PtP2W17-SWNTs) 的转换频率比单个PtP2W17集群高20倍,比Pt纳米粒子高140倍.
  • 理论研究显示,由于PtP2W17-SWNT的电子转移和纳米封闭效应,催化活性增强.

结论:

  • 亚纳米POM集群可以组装成单壁集群纳米管.
  • 这些POM-SWNT用于准备具有精确控制结构的高活性SAC.
  • 开发的POM-SWNT具有促进催化应用的巨大潜力.