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関連する概念動画

Transmission Electron Microscopy01:15

Transmission Electron Microscopy

8.0K
In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

3.1K
Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
3.1K
Superconductor01:24

Superconductor

2.1K
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
2.1K
Types Of Superconductors01:28

Types Of Superconductors

1.9K
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
1.9K
Mass Analyzers: Overview01:13

Mass Analyzers: Overview

2.1K
The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
2.1K
Electrodeposition01:08

Electrodeposition

2.2K
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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単一段階の定量組立プロセスを通して,超電圧,精密のメガメタルデリマー

Ting-Zheng Xie, Xiaolei Wu, Kevin J Endres

  • 1Beckman Institute , 405 North Mathews Avenue, Urbana, Illinois 61801, United States.

Journal of the American Chemical Society
|October 28, 2017
PubMed
まとめ

研究者は,巨大な単分子デンドリマーを合成するための新しいハイブリッド方法を開発し,より高い世代の課題を克服しました. このアプローチにより,独特の後期的なコア構造を持つ大きな超電荷メタロデンドリマーが得られました.

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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

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関連する実験動画

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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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科学分野:

  • 超分子化学
  • 材料科学
  • 有機合成

背景:

  • 巨大単分子デンドリマーの合成は複雑で,特に高次の世代には難しい.
  • 既存のコンバージェント・アンド・ディヴァージント・メソッドは,多段階の構築と浄化に問題があります.

研究 の 目的:

  • 巨大単分子 dendrimersのための新しいハイブリッド合成手順を報告する.
  • 高次世代デンドリマーの合成の困難を解決する.

主な方法:

  • ハイブリッド合成戦略が採用され,最終段階でコアが作られました.
  • 効率的な建設のために 定量的な組み立て技術が利用されました
  • 特徴付けには,核磁気共振 (NMR),電離スプレーイオン移動質量スペクトロメトリー (ESI-IM-MS),伝送電子顕微鏡 (TEM) が含まれていた.

主要な成果:

  • 120以上の電荷を持つ超電荷メタロデンドリマーが成功して合成された.
  • その結果,メタルデンドリマーは 11.3 nm の大きな直径を示した.
  • 以前に確立されたコアは,新しい方法を用いて効果的に統合されました.

結論:

  • ハイブリッドアプローチは,大きな超電圧メタロデントリマーへの実行可能な経路を提供します.
  • 遅い段階のコア構造は,複雑な樹状構造の合成を簡素化します.
  • 特徴づけられたメタルデンドリマーは,高度な応用の可能性を示しています.