What is re-entrant texture?

For re-entrant curved surfaces (re-entrant texture), the net traction on the liquid–vapor interface is directed upwards, thereby supporting the formation of a composite interface4.

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What is Superomniphobic?

Abstract. Surfaces that display contact angles >150° along with low contact angle hysteresis with essentially all high and low surface tension liquids, including water, oils and alcohols, are known as superomniphobic surfaces.

Why re-entrant surface topography is needed for robust oleophobicity?

Therefore, re-entrant surface topography becomes crucial for the oleophobicity, since it is capable of pinning the liquid–air interface stabilizing the Cassie–Baxter state. The double re-entrant topography can further enhance the stabilizing effect even for extremely low surface tension liquids.

What is Superoleophobic?

Superoleophobicity is a phenomenon where the contact angles of various oil droplets with low surface tension on a solid surface are larger than 150°.

What kind of material repels liquid?

Working prototypes made of silicon dioxide have been shown in laboratory tests to repel liquids (where the liquids have been successfully suspended and beaded up into mobile droplets with apparent contact angles of ~150°) including: water.

What are hydrophobic materials?

Hydrophobic substances are composed of non-polar molecules that repel bodies of water and attract other neutral molecules and non-polar solvents. Examples of these molecules are alkanes, oils and fats in general.

What makes a surface Oleophilic?

If there was an attraction, the surface would be considered oleophilic. Oleophilic means “oil-loving.” Oleophilic surfaces attract oils, or organic fluids, and allows it to level out or wet out. Most surfaces are oleophilic relative to the oily liquid, because of its low surface tension tends to spread out.

What is the definition of Omniphobic?

“Omniphobic” might sound like a way to describe someone who is afraid of everything, but it actually refers to a special type of surface that repels virtually any liquid.

What is a hydrophobic surface?

8.2 Hydrophobic Surface. Hydrophobic surface is a surface that has the ability to repel water [1]. The term hydrophobicity was derived from two Greek words that are hydro that means water and phobos that means fear; thus, hydrophobic surfaces can be define as material that tend to repel with water.

What is Oleophilic?

adjective Chemistry. of or relating to a substance that has an affinity for oils and not for water.

Is Teflon an oleophobic?

Surfaces with an n-hexadecane CA of 60°-80° are considered very oleophobic. An example of historic importance is polytetrafluoroethylene (Teflon,) with a contact angle of 65°. Polytetrafluoroethylene is well known for its repellent, non-stick and non-friction surface. Oleophobic surfaces do not repel a liquid.

What does it mean to re texture?

: to give a new or different texture to (something) uses a chemical peel to exfoliate and retexture the skin … his company will retexture the surface of the flooring, increasing the friction between the surface of the floor and anything that comes into contact with it. — Sarah Smellie

What is the meaning of reentrant?

re-entrant. Also found in: Thesaurus, Encyclopedia, Wikipedia. re·en·trant. also re-en·trant (rē-ĕn′trənt) adj. 1. Reentering; pointing inward. 2. MusicOf or relating to strings that, when plucked in order, make a discontinuously rising and falling sequence of pitches: a lute with reentrant tuning.

What does “retexture” mean?

What is a re-entrant angle?

1 A re-entrant angle. ‘The aperture is commonly planar, without re-entrants, but the sub-apical surface may develop a median sinus which may be deep and slit like or even trematose, with a single perforation at the end of an elongate tube termed the snorkel.’ An indentation or depression in terrain.