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Related Concept Videos

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

Molecular Orbital Theory II

Molecular Orbital Energy Diagrams
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...
Molecular Orbital Theory I02:35

Molecular Orbital Theory I

Overview of Molecular Orbital Theory
Formation of Intermediate Filaments00:57

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
07:26

Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides

Published on: November 21, 2013

Linear vs exponential formation of molecular-based assemblies.

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
Summary
This summary is machine-generated.

Molecular structure and reaction conditions critically influence thin-film growth. Tuning these factors controls growth behavior from exponential to linear, impacting molecular assembly.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Thin-film deposition is crucial for advanced materials.
  • Controlling molecular assembly is key for tailored material properties.
  • Understanding growth mechanisms informs material design.

Purpose of the Study:

  • To investigate the impact of molecular structure and reaction parameters on thin-film growth.
  • To elucidate the role of internal film morphology in growth kinetics.
  • To demonstrate control over molecular assembly growth behavior.

Main Methods:

  • Utilized a two-step assembly method.
  • Employed organic and metal-organic chromophores cross-linked with palladium.
  • Varied reaction conditions and analyzed film morphology.

Main Results:

  • Polypyridyl complexes showed exponential growth; organic systems showed linear growth.
  • Porous film morphology promoted exponential growth by influencing palladium storage.
  • Reaction condition tuning enabled a switch between exponential and linear growth.

Conclusions:

  • Molecular structure and reaction parameters are critical for thin-film growth.
  • Internal film morphology significantly affects growth kinetics and material behavior.
  • Controllable molecular assembly is achievable through optimized deposition conditions.