The name is absent

Chapter 2

characterize clay wettability.

Solids which are partially hydrophobic with contact angle θ > 90^o (measured
through the water) can also act as emulsifiers to make water-in-oil emulsions
more stable. Figure 2.9 ^[35] shows the wettability of solids and the types of
emulsions formed by the effect of solids wettability.

water-wet          amphiphilic             oil-wet

Wettability of solids

oil

water

Figure 2.9 Wettability of solids and the types of emulsions

For hydrophilic solids, the contact angle is smaller than 90^o. The surface of
solids is water-wet and the solids tend to stay in water phase. On the contrary, for

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