Table 4 Surface free energy per unit area, Lifshitz van der Waals component (γ LW ), acid–base component ( γ AB ) with the contributions of electron donor (γ - ) and electron acceptor (γ + ) interactions, total surface free energy ( γ ), surface polarity (γ AB γ -1 ), solubility parameter (δ θ ) and work of adhesion (for water, W w ; glycerol, W g ; diiodomethane, W d ) of adaxial Eucalyptus leaf, pepper and peach fruit surfaces
Surface free energy and its components (mJ m-2) | Work of adhesion (mJ m-2) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Sample | γ LW | γ - | γ + | γ AB | γ | γABγ- 1 (%) | δ θ ( MJ1/2 m-3/2) | W a.w | W a.g | W a.d |
Eucalyptus | 15.5 | 0.2 | 6.5 | 1.0 | 17.4 | 11.2 | 10.6 | 15.0 | 17.6 | 56.1 |
Pepper | 28.1 | 3.9 | 1.4 | 4.6 | 32.7 | 14.1 | 17.0 | 81.2 | 87.4 | 75.6 |
Peach | 31.1 | 0.04 | 10.0 | 1.2 | 32.2 | 3.7 | 16.8 | 22.1 | 22.1 | 79.4 |