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Nuclear Stability03:18

Nuclear Stability

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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...
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Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
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Magical Thinking01:29

Magical Thinking

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Magical thinking encompasses the belief in assumptions that defy logical reasoning yet appear intuitively convincing. It is a common psychological phenomenon that persists across various cultural and individual contexts. While these assumptions contradict empirical evidence and scientific laws, they often serve meaningful psychological roles in promoting emotional resilience and a sense of control, especially under stress or uncertainty.Thought-Action Fusion and the Law of SimilarityA key...
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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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The time response of a linear time-invariant (LTI) system can be divided into transient and steady-state responses. The transient response represents the system's initial reaction to a change in input and diminishes to zero over time. In contrast, the steady-state response is the behavior that persists after the transient effects have faded.
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Cluster Sampling Method

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Appropriate sampling methods ensure that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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メソフェーズの形成は,高純度な魔法サイズのクラスターを安定させる

Douglas R Nevers1, Curtis B Williamson1, Benjamin H Savitzky2

  • 1Robert F. Smith School of Chemical and Biomolecular Engineering , Cornell University , Ithaca , New York 14850 , United States.

Journal of the American Chemical Society
|January 30, 2018
PubMed
まとめ
この要約は機械生成です。

高濃度の合成により,安定した有機-無機メソフェーズを形成することで,非常に純粋な魔法サイズのクラスター (MSC) が得られます. このメソフェーズはナノ粒子の成長を防止し,原子包装を超えたMSCの安定化に関する新しい理解を提供します.

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A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions
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関連する実験動画

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • 化学合成

背景:

  • マジックサイズのクラスター (MSC) は,従来のナノ粒子の成長を阻害するユニークな安定性と均一なサイズを示します.
  • MSCの核形成と安定化の経路を理解することは,依然として重要な研究課題です.

研究 の 目的:

  • MSCの形成と安定性に対する高濃度の合成の影響を調査する.
  • MSCの安定化における付随段階の役割を明らかにする.

主な方法:

  • 高濃度 (1000 mM) のMSCの合成
  • 反応経路と相形成を研究するX線散射分析.
  • 異なる濃度 (500 mM, <200 mM) でMSCの振る舞いの調査

主要な成果:

  • 高濃度の合成 (純度99. 9%) は,成長と溶解に抵抗する非常に安定したMSCを生成します.
  • 高濃度で形成される大きな六角形の有機-無機メソファースは,MSCの成長を止め,ナノ粒子形成を防ぐ.
  • 中間および低濃度では,不安定なメソフェーズと支配的なナノ粒子形成が生じます.

結論:

  • MSCの安定性は,閉じた殻の原子パッキングのみではなく,自己形成の繊維性メソファースアセンブリに起因する.
  • 高濃度合成は,MSCの安定化に不可欠な濃度依存の表面活性物質の相性を明らかにする.
  • この研究は,MSCの合成と安定化のための堅固な方法を提供し,表面活性物質とクラスタの相互作用を強調しています.