The Amazing Properties of Super Hydrophobic and Super Hydrophilic Surfaces

💧Hydrophobic surfaces have a contact angle with water greater than 90°, while hydrophilic surfaces have a contact angle less than 5°.

🖊️Super hydrophilic surfaces attract water due to their polar nature, causing it to spread out and flatten on the surface.

🚫Hydrophobic surfaces can repel water and prevent substances like spray paint from adhering to them.

✍️Water can easily wipe away permanent markers on hydrophilic surfaces, as the water can slide under the ink.

🔬Ferrofluid, a dark nonviscous liquid, can be easily removed from hydrophilic surfaces when water is applied.

What does it mean for a surface to be hydrophobic?

—A surface is considered hydrophobic if it has a contact angle with water greater than 90°.

Why do hydrophilic surfaces attract water?

—Hydrophilic surfaces attract water due to their polar nature, causing the water molecules to be attracted to the surface and spread out.

Can hydrophilic surfaces wipe away permanent markers?

—Yes, water can easily slide under the ink of permanent markers on hydrophilic surfaces, allowing it to be wiped away.

What is ferrofluid, and how does it interact with hydrophilic surfaces?

—Ferrofluid is a dark nonviscous liquid that contains iron particles. When applied to a hydrophilic surface, water can easily slide under the ferrofluid, causing it to be removed.

Can a super hydrophobic surface be created?

—The video demonstrates an attempt to create a super hydrophobic surface using fumed silica, but it was not successful.

00:00Introduction to the concepts of super hydrophobic and super hydrophilic surfaces.

01:30Explanation of the contact angle and what it means for a surface to be hydrophobic or hydrophilic.

02:56Demonstration of how water interacts with a hydrophilic surface, causing it to spread out and flatten.

03:53Water's ability to wipe away permanent markers on hydrophilic surfaces.

04:34Observation of ferrofluid and how water can remove it from a hydrophilic surface.

05:00Attempt to create a super hydrophobic surface using fumed silica, but it does not repel water.

06:05Summary of the video and encouragement to like, subscribe, and stay tuned for future content.