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Surface Tension and Surface Energy01:16

Surface Tension and Surface Energy

When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...

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Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment
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Fluoroalkylated silicon-containing surfaces-estimation of solid-surface energy.

Shreerang S Chhatre1, Jesus O Guardado, Brian M Moore

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

ACS Applied Materials & Interfaces
|November 12, 2010
PubMed
Summary

Researchers synthesized and evaluated novel molecules for creating robust omniphobic surfaces. These new fluorinated compounds offer low surface energy, crucial for repelling liquids like octane and methanol on textured materials.

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Area of Science:

  • Materials Science
  • Surface Chemistry

Background:

  • Designing omniphobic surfaces requires low solid-surface energy and specific micro/nanotextures.
  • 1H,1H,2H,2H-Heptadecafluorodecyl polyhedral oligomeric silsesquioxane (fluorodecyl POSS) is a preferred molecule for coating textured surfaces due to its very low surface energy (γsv≈10 mN/m).

Purpose of the Study:

  • To synthesize and evaluate new molecules related to fluorodecyl POSS for potential use in omniphobic surface coatings.
  • To investigate how variations in fluoroalkyl chain length or molecular structure (linear/cyclic) affect solid-surface energy.

Main Methods:

  • Estimated solid-surface energy (γsv) using contact angle measurements on flat silicon wafer surfaces.
  • Performed Zisman analysis with n-alkanes (15.5≤γlv≤27.5 mN/m) and Girifalco-Good analysis with a wider range of polar/nonpolar liquids (15.5≤γlv≤72.1 mN/m).
  • Determined surface energy contributions (hydrogen bonding, polar, dispersion) using specific liquid probes (acetone, chloroform, dodecane or diiodomethane, dimethyl sulfoxide, water).

Main Results:

  • A series of novel fluorinated molecules were synthesized and characterized.
  • The solid-surface energy of these new compounds was successfully estimated.
  • Different molecular structures and fluoroalkyl chain lengths were shown to influence surface energy properties.

Conclusions:

  • The synthesized molecules show promise for developing advanced omniphobic surfaces.
  • Understanding the relationship between molecular structure and surface energy is key for designing effective low-surface-energy coatings.
  • Further research can explore these molecules for practical applications requiring liquid repellency.