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Related Concept Videos

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The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
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Hückel's Rule Diagram of π MOs: Frost Circle01:08

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The Frost circle or the inscribed polygon method is a graphical method for determining the relative energies of π molecular orbitals (MOs) for planar, fully conjugated, and monocyclic compounds. This method was first described by A. A. Frost and Boris Musulin in 1953.
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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Updated: Jun 7, 2025

Fabrication of Ultra-thin Color Films with Highly Absorbing Media Using Oblique Angle Deposition
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Nanograting-Based Dynamic Structural Colors Using Heterogeneous Materials.

Jingang Wang1,2, Haibo Yu1, Jianchen Zheng1,2

  • 1State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang, 110016, People's Republic of China.

Nano-Micro Letters
|November 11, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed dynamic structural colors using pH-responsive hydrogels and photoresist. These microscale colors can encode information and sense environmental changes, offering potential for microfluidics and data encryption.

Keywords:
Dynamic structural colorsFour-dimensional printingHeterogeneous materialsNanogridpH-responsive

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photonics

Background:

  • Dynamic structural colors offer microscale sensing capabilities for micro-robotics and microfluidics.
  • Current limitations include slow encoding, integration challenges, and inaccurate reflection of physical quantities.

Purpose of the Study:

  • To develop a 2.5-dimensional dynamic structural color system for enhanced microscale sensing and information encoding.
  • To overcome limitations of existing dynamic structural color technologies.

Main Methods:

  • Fabrication of 2.5D nanogratings by interweaving pH-responsive hydrogel with IP-L photoresist.
  • Utilizing pH-induced swelling of hydrogel to tune grating periods and structural colors.
  • Employing grayscale stripe images for patterned encoding and array printing of nanogrid structures.

Main Results:

  • Achieved pH-tuned structural colors at a 45° incidence angle due to hydrogel swelling.
  • Demonstrated patterned encoding and array printing of dynamic structural colors.
  • Successfully encoded periods and heights of nanogrid structures using grayscale images.

Conclusions:

  • The developed dynamic structural color networks show significant potential for information encryption.
  • The technology is promising for in situ sensing applications in microfluidic chips.
  • This advancement addresses key challenges in microscale sensing and dynamic color generation.