Polar and Dispersive Surface Tension Calculation
There are two methods for calculating the polar and dispersive surface tension components of a liquid: pendant drop & sessile drop method.
LW–AB Components of Solid Surface Tensions
Lifshitz-van der Waals/Lewis Acid–Base (LW–AB) Components of Solid Surface Tensions Solid Chemical Formula γLWS (mN/m) van der Waals γ+S (mN/m) Acceptor γ–S (mN/m) Donor References Polytetrafluoroethylene (C2F4)n 20.24 0 0 [ 1 ] Polymethyl Methacrylate (C5O2H8)n 10 0
LW–AB Components of Liquid Surface Tensions
Lifshitz-van der Waals/Lewis Acid–Base (LW–AB) Components of Liquid Surface Tensions Liquid Chemical Formula Temperture γLWL (mN/m) Van der waals γ+L (mN/m) Acceptor γ–L (mN/m) Donord Reference Water H2O 20 26.85 22.975 22.975 [ 1 ] 21.8 25.5 25.5
Polar and Dispersive Components of Solid Surface Tensions
Polar and Dispersive Components of Solid Surface Tensions Solid Chemical formula γdS (mN/m) Dispersive γpS (mN/m) Polar γS (mN/m) Surface Tension Reference Molybdenum disulfide MoS2 27.6 12.4 40 [ 1 ] Tungsten disulfide WS2 25.59 14.41 40 [
Polar and Dispersive Components of Liquid Surface Tensions
Polar and Dispersive Components of Liquid Surface Tensions Liquid Chemical formula Temperture γdL (mN/m) Dispersive γpL (mN/m) Polar γL (mN/m) Surface Tension Reference Water H2O 20 27.19 45.61 72.8 [ 1 ] 26.25 46.55 72.8 [ 2 ]
Contact Angle of Powders Comparision of Methods
The first step of dispersion and dissolution of a powder is wetting; therefore, understdanding the wettability behavior of powders is important in many applications such as inks, paints, food and pharmaceutical industry. The method to characterize powder wettability depends on the powder properties and application purposes. Sessile drop, Wilhelmy plate and liquid penetration (both column and thin film wicking) are common methods for determining the wettability of powders.
Solid Surface Free Energy
Solid surface free energy is one of the basic physical properties like density, melting point, refractive index, dielectric constant, modulus, etc. Measuring the solid surface free energy has applications in paints, coatings, and adhesives, semiconductors, printing, aerospace, mining, pharmaceutical and many more industries. To give an insight, high surface energy material is more reactive and stickier.
Surface Free Energy Calculation
Jikan CAG-20 contact angle goniometers measure the surface free energy of solids (solid surface tension) from contact angle measurements. The algorithm used in the software (Jikan Assistant) requires the user to measure the contact angle of at least one test
Automatic Contact Point Detection
Only few contact angle goniometers provide the back to front tilt of the camera. This feature enables the user to perfectly see the contact point. It also enables the software (Jikan Assistant) to automatically pick the contact points.