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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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Archaeal surface appendages are highly specialized structures essential for environmental adaptation, encompassing roles in adhesion, biofilm formation, and motility. Among these appendages, pili and archaella stand out for their distinct morphologies and functionalities, enabling archaea to thrive in diverse and often extreme environments.Pili: Adhesion and Biofilm FormationPili are filamentous structures assembled from pilin protein subunits, primarily contributing to adhesion and biofilm...
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Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
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Superamphiphobic surfaces.

Zonglin Chu1, Stefan Seeger

  • 1Department of Chemistry, University of Zurich, Zurich CH-8057, Switzerland. sseeger@pci.uzh.ch.

Chemical Society Reviews
|February 1, 2014
PubMed
Summary
This summary is machine-generated.

Superamphiphobic surfaces combine roughness and chemistry for extreme water and oil repellency. This review covers their characterization, fabrication, and applications.

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Area of Science:

  • Materials Science
  • Surface Chemistry

Background:

  • Superamphiphobicity is defined by high contact angles (>150°) and low contact angle hysteresis (CAH) for both water and oils.
  • Achieving superamphiphobicity requires careful control over both surface roughness and surface chemistry.

Purpose of the Study:

  • To review the current research on superamphiphobic surfaces.
  • To discuss methods for characterizing superamphiphobicity.
  • To explore fabrication techniques and applications of these advanced surfaces.

Main Methods:

  • Review of existing literature on superamphiphobic surfaces.
  • Analysis of characterization techniques for contact angle and contact angle hysteresis.
  • Compilation of fabrication methods for creating rough and low-surface-energy surfaces.

Main Results:

  • Superamphiphobicity is achieved through synergistic effects of surface topography and low-surface-energy coatings.
  • Various fabrication techniques, including lithography, etching, and self-assembly, are employed.
  • Characterization relies on precise measurements of contact angles and hysteresis for diverse liquids.

Conclusions:

  • Superamphiphobic surfaces offer significant potential for various applications due to their dual repellency.
  • Further research is needed to optimize fabrication processes and explore novel applications.
  • Understanding the interplay between surface structure and chemistry is key to designing advanced superamphiphobic materials.