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Molecular Shapes01:18

Molecular Shapes

Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.Two regions of electron density in a diatomic...
Molecular Orbital Theory II03:51

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Molecular Models02:00

Molecular Models

Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Formation of Intermediate Filaments

Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been reported.

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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
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Published on: November 21, 2013

分子ベースのアセンブリの線形対指数的形成

Joyanta Choudhury1, Revital Kaminker, Leila Motiei

  • 1Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel.

Journal of the American Chemical Society
|June 24, 2010
PubMed
まとめ
この要約は機械生成です。

分子構造と反応条件は,薄膜の成長に重大な影響を及ぼします. これらの要因を調節すると,成長行動が指数関数から線形に変化し,分子組立に影響を及ぼします.

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科学分野:

  • マテリアルサイエンス 材料科学
  • ナノテクノロジー ナノテクノロジー
  • 化学工学化学工学とは

背景:

  • 薄膜堆積は,高度な材料にとって極めて重要です.
  • 分子アセンブリを制御することは,マテリアル特性を調整するための鍵です.
  • 成長メカニズムの理解は,材料設計に役立つ.

研究 の 目的:

  • 薄膜の成長に対する分子構造と反応パラメータの影響を調査する.
  • 成長運動学における内膜形態学の役割を明らかにする.
  • 分子アセンブリの成長行動に対するコントロールを証明するために.

主な方法:

  • 2段階の組立方法を使用しました.
  • パラジウムと交互に結合した有機および金属有機染色体を使用した.
  • 様々な反応条件とフィルム形態を分析した.

主要な成果:

  • ポリピリジル複合体は指数関数的に成長し,有機系は線形的に成長した.
  • 毛細な膜の形態学は,パラジウム貯蔵に影響を与えることで指数関数的な成長を促した.
  • 反応条件のチューニングにより,指数関数成長と線形成長の間の切り替えが可能になった.

結論:

  • 分子構造と反応パラメータは,薄膜の成長に不可欠です.
  • 内部膜の形態学は,成長運動と材料の行動に大きな影響を与えます.
  • 制御可能な分子組成は,最適化された堆積条件によって達成可能である.