'Hydrophile', from the
Greek ''(hydros)'' "water" and φιλια ''(philia)'' "friendship," refers to a physical property of a
molecule that can transiently bond with water (H
2O) through
hydrogen bonding. This is
thermodynamically favorable, and makes these molecules soluble not only in water, but also in other polar solvents. There are hydrophilic and
hydrophobic parts of the cell membrane.
A hydrophilic
molecule or portion of a molecule is one that is typically charge-polarized and capable of
hydrogen bonding, enabling it to dissolve more readily in water than in oil or other
hydrophobic solvents. Hydrophilic and hydrophobic molecules are also known as
polar molecules and
nonpolar molecules, respectively.
Some hydrophilic substances don't dissolve. This type of mixture is called a colloid.
Soap has a hydrophilic head and a hydrophobic tail which allows it to dissolve in both waters and oils, therefore allowing the soap to clean a surface.
See also
★
Hydrophobe
★
Wetting
★
Super hydrophilicity