What is the science behind stickers?

Stickers might seem like a simple concept, but there's actually some fascinating science behind how they work. At their core, stickers rely on the principles of adhesion and cohesion.

Adhesion is the process by which different molecules or surfaces stick together. When you place a sticker on a surface, adhesion occurs between the adhesive on the back of the sticker and the surface it's being applied to. Adhesives typically work by forming molecular bonds with the surface they're applied to, creating a strong connection.

Cohesion, on the other hand, is the tendency of molecules of the same substance to stick together. This is what keeps the layers of the sticker itself intact. The cohesive forces within the adhesive material hold it together and prevent it from falling apart.

The specific type of adhesive used in a sticker can vary depending on factors like the surface it will be applied to, how long it needs to stay in place, and whether it needs to be removable or permanent. Common adhesive types include pressure-sensitive adhesives, which rely on the application of pressure to activate them, and water-activated adhesives, which require moisture to become sticky.

Additionally, the surface tension of the adhesive plays a role in how well a sticker sticks to a surface. Surface tension is the property of the surface of a liquid that allows it to resist an external force. Adhesives with higher surface tension tend to spread out more evenly over a surface, leading to better adhesion.

Overall, the science behind stickers involves a delicate balance of adhesion and cohesion, as well as factors like surface tension and adhesive type, all working together to create a sticky yet stable bond between the sticker and the surface it's applied to.