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Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...

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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
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Published on: November 4, 2021

Deterministic order in surface micro-topologies through sequential wrinkling.

Jie Yin1, Jose Luis Yagüe, Damien Eggenspieler

  • 1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Advanced Materials (Deerfield Beach, Fla.)
|August 24, 2012
PubMed
Summary
This summary is machine-generated.

Sequential wrinkling strategy (SWS) creates ordered herringbone patterns with controlled wavelengths and zig-zag angles. This method offers a new way to measure thin-film properties without needing film thickness measurements.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Thin Film Technology

Background:

  • Thin-film materials are crucial in various technologies.
  • Controlling surface patterns on thin films is challenging.
  • Existing methods for thin-film characterization can be complex.

Purpose of the Study:

  • To develop a novel method for creating ordered herringbone patterns on thin films.
  • To achieve precise control over pattern wavelengths and zig-zag angles.
  • To establish a simplified approach for measuring thin-film mechanical properties.

Main Methods:

  • Implementation of a sequential wrinkling strategy (SWS).
  • Application of non-equi-biaxial prestrain.
  • Analysis of pattern formation and characteristics.

Main Results:

  • Successfully generated ordered herringbone patterns with deterministic long and short wavelengths.
  • Achieved prescribed zig-zag turning angles less than 90° for the first time.
  • Demonstrated that SWS can be used for thin-film mechanical property measurement without film thickness data.

Conclusions:

  • The sequential wrinkling strategy (SWS) is an effective method for creating complex surface patterns.
  • SWS offers a new, simplified metrology for thin-film characterization.
  • This technique opens possibilities for advanced material design and analysis.