Hydrofobisissa

Hydrofobisissa is a neologism used in materials science to denote systems, surfaces, or substances that exhibit extreme hydrophobicity. The term derives from hydrophobic and the Finnish suffix -issa, used here to indicate “in or of hydrophobic properties.” In practice, hydrofobisissa materials repel water to a high degree, typically achieving water contact angles above 150 degrees and displaying high water roll-off. The phenomenon arises from a combination of low surface energy and micro- or nano-scale roughness, which traps air and reduces solid–liquid contact as described by the Cassie–Baxter model, though the Wenzel state can occur if the roughness is fully wetted.

Common chemistries include fluorinated polymers, silicones, and silanized inorganic coatings; natural examples include the leaves of certain plants. Durable superhydrophobic coatings aim to withstand abrasion, UV exposure, and environmental wear, while remaining chemically stable and non-toxic.

Applications span self-cleaning surfaces, anti-icing and anti-fouling coatings, water-repellent textiles, and protective layers for solar panels and electronics. Measurement of hydrofobisissa properties relies on water contact angle goniometry, contact angle hysteresis, and surface energy calculations; environmental and durability testing under abrasion, UV, and chemical exposure are standard components of performance assessment.

Challenges include achieving long-term durability without compromising environmental safety, especially when using fluorinated compounds. Research increasingly explores eco-friendly alternatives such as silica-based roughness, silicone-based chemistries, and wax or plant-based coatings.

---