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Related Concept Videos

Surface Active Agents01:27

Surface Active Agents

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Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)01:27

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α,β-Unsaturated carbonyl compounds with two electrophilic sites, the carbonyl carbon, and the β carbon, are susceptible to nucleophilic attack via two modes: conjugate or 1,4-addition and direct or 1,2-addition.
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Related Experiment Video

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Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance
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Efficient Functionalization of Additives at Supramolecular Material Surfaces.

Olga J G M Goor1,2, Henk M Keizer3, Anne L Bruinen4

  • 1Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600, MB, Eindhoven, The Netherlands.

Advanced Materials (Deerfield Beach, Fla.)
|November 30, 2016
PubMed
Summary

Surface modification of supramolecular materials is achieved by functionalizing additives after material processing. This decouples harsh conditions from functionalization, enabling distinct surface and bulk compositions, confirmed by time-of-flight secondary-ion mass spectrometry.

Keywords:
3D ToF-SIMSclick chemistryelectrospinningpostmodificationsupramolecular materials

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Supramolecular Chemistry

Background:

  • Supramolecular materials offer unique properties but are challenging to functionalize post-processing.
  • Conventional functionalization methods often require harsh conditions incompatible with material integrity.

Purpose of the Study:

  • To demonstrate selective surface modification of additives within supramolecular materials.
  • To decouple material processing from surface functionalization.
  • To analyze surface and bulk composition differences.

Main Methods:

  • Incorporation of additives into supramolecular material matrices.
  • Selective chemical modification of incorporated additives.
  • High-resolution depth profiling using time-of-flight (ToF) secondary-ion mass spectrometry (SIMS).

Main Results:

  • Successful selective surface modification of additives within the supramolecular material.
  • Demonstration that harsh processing conditions can be separated from the functionalization step.
  • ToF-SIMS analysis revealed significant differences between surface and bulk material composition.

Conclusions:

  • Selective surface modification of additives is a viable strategy for functionalizing supramolecular materials.
  • This approach allows for precise control over surface properties independent of bulk processing.
  • The findings open avenues for designing advanced materials with tailored surface functionalities.