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Related Concept Videos

Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Cyclam-based Cu(II) and Fe(III) complexes for antifouling coating development.

Inês M Nunes1,2, Bruno J C Vieira3,4,5, João C Waerenborgh3,4,5

  • 1Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal.

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Summary
This summary is machine-generated.

This study shows polyurethane coatings with copper and iron complexes effectively reduced marine biofilm formation. These eco-friendly antifouling agents offer a promising solution for marine applications.

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Area of Science:

  • Materials Science
  • Marine Biology
  • Environmental Science

Background:

  • Biofouling on submerged surfaces causes significant equipment degradation and maintenance costs.
  • Current antifouling coatings often rely on toxic compounds, posing environmental risks.
  • Developing effective and eco-friendly antifouling solutions is crucial for marine applications.

Purpose of the Study:

  • To evaluate the antifouling efficacy of polyurethane (PU) coatings modified with cyclam-based Cu(II) and Fe(III) complexes.
  • To assess the performance of these modified coatings against *Cobetia marina* biofilm formation under simulated marine conditions.
  • To determine the potential of these complexes as environmentally compatible antifouling agents.

Main Methods:

  • Modification of polyurethane coatings with cyclam-based Cu(II) and Fe(III) complexes.
  • Exposure of coated surfaces to *Cobetia marina* under controlled hydrodynamic conditions mimicking marine environments.
  • Quantification of biofilm reduction by measuring thickness, total volume, and culturable cell counts.

Main Results:

  • The modified PU coatings significantly reduced biofilm thickness by 17-38%.
  • A reduction in biofilm total volume (33-39%) and culturable cells (36-39%) was observed compared to the unmodified PU control.
  • The cyclam-based Cu(II) and Fe(III) complexes demonstrated potent antifouling activity.

Conclusions:

  • Polyurethane coatings incorporating cyclam-based Cu(II) and Fe(III) complexes are effective in preventing *Cobetia marina* biofilm formation.
  • These complexes show promise as low-ecotoxicity and compatible antifouling agents for marine applications.
  • The developed coatings offer a sustainable alternative to traditional toxic antifouling solutions.