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Waterproofing and Anti-Bacterial Admixtures in Concrete01:22

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Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
Waterproofing admixtures render concrete hydrophobic,...
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Slippery Alkoxysilane Coatings for Antifouling Applications.

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New siloxane coatings with varying alkyl chain lengths offer excellent wettability and antifouling properties. These environmentally friendly alternatives demonstrate durability and low adhesion, showing promise for medical applications.

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antifoulingdurablesiloxane hydrophobic coatingsslippery surfacestransparentwater contact angle

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Area of Science:

  • Materials Science
  • Surface Chemistry

Background:

  • Developing advanced coatings with tunable wettability and antifouling characteristics is crucial for various applications.
  • Siloxane-based materials offer potential due to their unique chemical properties.

Purpose of the Study:

  • To investigate the wettability and antifouling behavior of siloxane coatings with varying alkyl chain lengths.
  • To explore the influence of hydrophobic group nature on surface properties.
  • To assess the potential of these coatings as environmentally friendly alternatives.

Main Methods:

  • Preparation of siloxane coatings using trimethoxysilane precursors with alkyl chains (1-18 C atoms).
  • Characterization of wettability using contact angles, sliding angles, and contact angle hysteresis.
  • Surface topography analysis via atomic force microscopy (AFM).
  • Transparency assessment using UV-vis spectroscopy.

Main Results:

  • Coatings exhibited low surface topography (rms < 50 nm) and high transparency.
  • Sliding properties for water, diiodomethane, methanol, and ethylene glycol were significantly influenced by alkyl chain length.
  • Longer chain coatings achieved water sliding angles comparable to superhydrophobic surfaces.
  • The coatings demonstrated durability against abrasion and low adhesion to synthetic feces.

Conclusions:

  • Siloxane coatings with tailored alkyl chain lengths provide tunable wettability and effective antifouling properties.
  • These materials serve as promising, environmentally friendly alternatives to fluorinated coatings.
  • Their durability and low adhesion suggest potential applications in the medical sector to combat biofouling.