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関連する概念動画

Kinetic Energy00:23

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Kinetic energy is the ability of an object in motion to do work or enact change. It can take on many forms. For instance, water flowing down a waterfall has kinetic energy. In biological systems, particles of light travel and are absorbed by plants to create chemical energy. Animals consume the chemical energy and give off molecules that carry their scent through the air. They also generate kinetic energy when they run away from predators. Entire systems also possess kinetic energy, like the...
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Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
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The kinetic molecular theory qualitatively explains the behaviors described by the various gas laws. The postulates of this theory may be applied in a more quantitative fashion to derive these individual laws.
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Directed Assembly of Elastin-like Proteins into defined Supramolecular Structures and Cargo Encapsulation In Vitro
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運動経路制御による1次元の自己組み立てにおける超分子ポリモルフィズム

Marius Wehner1,2, Merle Insa Silja Röhr1, Michael Bühler1

  • 1Center for Nanosystems Chemistry & Bavarian Polymer Institute , Universität Würzburg , Theodor-Boveri-Weg , 97074 Würzburg , Germany.

Journal of the American Chemical Society
|March 21, 2019
PubMed
まとめ

研究者は,ペリレンビシミド (PBI) 分子の自己組み立てを3つの異なる1D超分子ポリモルフに制御しました. この分子包装の制御は物理的または化学的方法によって達成され,ポリモルフィズムへの洞察を提供した.

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科学分野:

  • 材料科学
  • 超分子化学
  • 物理化学

背景:

  • 分子固体のポリモルフィズムを制御することは,性質が分子包装に依存するため,極めて重要です.
  • ペリレンビシミド (PBI) 誘導体は,その光電子特性のために広く研究されている.

研究 の 目的:

  • PBI 臓器ゲレータ (PBI-4) が,一次元 (1D) の異なる超分子ポリモルフに自己組織化することを調査する.
  • これらのポリモルフの形成と相互変換を制御する要因を理解する.

主な方法:

  • UV/vis,CD,光,そしてIRスペクトル
  • 原子力顕微鏡 (AFM)
  • Nudged Elastic Band (NEB) の計算について
  • 時間,濃度,温度に依存する実験

主要な成果:

  • PBI-4は,同じ溶媒/濃度で室温で3つの異なる1D超分子ポリモルフ (Agg 1-3) に自己組み立てました.
  • ポリモルフは π-π スタッキングと水素結合のパターンによって異なる.
  • NEBの計算では,運動的に閉じ込められた状態 (Agg 1) を含む核化の経路が明らかになった.
  • 熱力学的安定性および相互変換運動性が解明されました.

結論:

  • 特定のポリモルフの生成は,超音波またはシードによって達成できます.
  • この研究は,自己組み立て 1D 構造におけるポリモルフィズムの理解を進める.