Dew drops adhering to a spider web

For the medical condition see Adhesion (medicine) Image File history File linksMetadata Download high resolution version (1200x808, 904 KB) Spider Web Covered with Dew Drops. ... Image File history File linksMetadata Download high resolution version (1200x808, 904 KB) Spider Web Covered with Dew Drops. ... Dew on a spider web Dew is water in the form of droplets that appears on thin, exposed objects in the morning or evening. ... This article needs additional references or sources for verification. ... An adhesion is a fibrous band of scar tissue that binds together normally separate anatomical structures. ...

Adhesion is the molecular attraction exerted between bodies in contact. molecular kinetic molecular model of matter is increasing the temperature of a substance increases the motion of its particles. ...

Mechanisms of Adhesion

Cohesion causes water to form drops, surface tension causes them to be nearly spherical, and adhesion keeps the drops in place.

Water droplets are flatter on a Hibiscus flower which shows better adhesion.

Five mechanisms have been proposed to explain why one material sticks to another: ImageMetadata File history File links Download high resolution version (1600x1200, 346 KB) Photographer: Staffan Enbom from Finland Title: Water drops Taken on: 2004-07-10 16:38:30 Original source: Flickr. ... ImageMetadata File history File links Download high resolution version (1600x1200, 346 KB) Photographer: Staffan Enbom from Finland Title: Water drops Taken on: 2004-07-10 16:38:30 Original source: Flickr. ... Cohesion may mean: Cohesion (chemistry): the intermolecular attraction between like-molecules. ... Water dropping from a faucet A drop is a small volume of liquid, bounded completely or almost completely by free surfaces. ... Surface tension is an effect within the surface layer of a liquid that causes that layer to behave as an elastic sheet. ... Image File history File links Download high-resolution version (1976x1828, 613 KB) Summary Licensing File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Chinese hibiscus Adhesion Cohesion (chemistry) User:Nvineeth ... Image File history File links Download high-resolution version (1976x1828, 613 KB) Summary Licensing File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Chinese hibiscus Adhesion Cohesion (chemistry) User:Nvineeth ... Species Over 200 species Hibiscus, or rosemallow, is a large genus of about 200–220 species of flowering plants in the family Malvaceae, native to warm temperate, subtropical and tropical regions throughout the world. ...

Adhesive materials fills the voids or pores of the surfaces and hold surfaces together by interlocking.Sewing forms a large scale mechanical bond, velcro forms one on a medium scale, and some textile adhesives form one at a small scale. Velcro: hooks (left) and loops (right). ...

Chemical Adhesion

Two materials may form a compound at the join. The strongest joins are where atoms of the two materials swap (ionic bonding) or share (covalent bonding) outer electrons. A weaker bond is formed if oxygen, nitrogen or fluorine atoms of the two materials share a hydrogen nucleus (hydrogen bonding). A chemical compound is a chemical substance of two or more different chemically bonded chemical elements, with a fixed ratio determining the composition. ... An ionic bond can be formed after two or more atoms give up (or gain) electrons, so as to become ions. ... Covalent bonding is a form of chemical bonding characterized by the sharing of one or more pairs of electrons between atoms, in order to produce a mutual attraction, which holds the resultant molecule together. ... General Name, symbol, number oxygen, O, 8 Chemical series nonmetals, chalcogens Group, period, block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Standard atomic weight 15. ... General Name, symbol, number nitrogen, N, 7 Chemical series nonmetals Group, period, block 15, 2, p Appearance colorless gas Standard atomic weight 14. ... Distinguished from fluorene and fluorone. ... General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1. ... In chemistry, a hydrogen bond is a type of attractive intermolecular force that exists between two partial electric charges of opposite polarity. ...

Dispersive Adhesion

Also known as Adsorption. Two materials may be held together by van der Waals forces. A van der Waals force is the attraction between two molecules each of which has a region of a positive or negative charge. In the simple case, such molecules are therefore polar with respect to average charge density, although in larger or more complex molecules, there may be multiple "poles" or regions of greater positive or negative charge. These positive and negative poles may be a permanent property of a molecule (Keesom forces) or a transient effect which can occur in any molecule, as the random movement of electrons within the molecules may result in a temporary concentration of electrons in one region(London forces). In chemistry, the term van der Waals force originally referred to all forms of intermolecular forces; however, in modern usage it tends to refer to intermolecular forces that deal with forces due to the polarization of molecules. ... The Keesom force is an intermolecular force resulting from the angle-averaged dipole-dipole interaction between two atoms or molecules and its potential. ... The title given to this article is incorrect due to technical limitations. ...

Electrostatic Adhesion

Some conducting materials may pass electrons to form a difference in electrical charge at the join. This results in a structure similar to a capacitor and creates an attractive electrostatic force between the materials. Properties The electron (also called negatron, commonly represented as e−) is a subatomic particle. ... Electric charge is a fundamental property of some subatomic particles, which determines their electromagnetic interactions. ... See Capacitor (component) for a discussion of specific types. ... Electrostatics is the branch of physics that deals with the force exerted by a static (i. ...

Diffusive Adhesion

Some materials may merge at the joint by diffusion. This may occur when the molecules of both materials are mobile and soluble in each other. This would be particularly effective with polymer chains where one end of the molecule diffuses into the other material. It is also the mechanism involved in sintering. When metal or ceramic powders are pressed together and heated, atoms diffuse from one particle to the next. This joins the particles into one. Atomic diffusion is a process whereby the random thermally-activated hopping of atoms in a solid results in the net transport of atoms. ... It has been suggested that this article or section be merged with Solution. ... A polymer (from Greek: πολυ, polu, many; and μέρος, meros, part) is a substance composed of molecules with large molecular mass composed of repeating structural units, or monomers, connected by covalent chemical bonds. ... This article or section does not cite its references or sources. ... This article is about metallic materials. ... Fixed Partial Denture, or Bridge The word ceramic is derived from the Greek word κεραμικός (keramikos). ...

What Makes an Adhesive Bond Strong?

The strength of the adhesion between two materials depends on which of the above mechanisms occur between the two materials, and the surface area over which the two materials contact. Materials that wet against each other tend to have a larger contact area than those that don't. Wetting depends on the surface energy of the materials. Good examples of adhesion known by many people are tape, glue, stickers, and rubbing dirt on golf balls. Wetting of different fluids. ... Surface energy quantifies the disruption of chemical bonds that occurs when a surface is created. ...

See also

• Adhesion (medicine)
• Cell adhesion
• Cohesion
• Rail adhesion
• Scratch tester Method of testing the adhesion of coatings to substrates

An adhesion is a fibrous band of scar tissue that binds together normally separate anatomical structures. ... Schematic of cell adhesion The study of cell adhesion is part of cell biology. ... Mercury sticks together because of the cohesive forces. ... The term adhesion railway or adhesion traction describes the most common type of railway, where power is applied by driving some or all of the wheels of the train and thus it relies on the friction between a steel wheel and a steel rail. ... One of the basic requirements of a coating if it is going to improve the surface properties of a tool or component is adhesion. ...

References

• John Comyn, Adhesion Science, Royal Society of Chemistry Paperbacks, 1997
• A.J. Kinloch, Adhesion and Adhesives: Science and Technology, Chapman and Hall, 1987