Interfaces and interphases of (bio)materials: Definitions, structures, and dynamics

What exactly is an interface , and when is an interphase the more correct concept? The nature of interfaces and the phenomena occurring there are described before the role of interphases is illustrated with a series of examples taken from purely artificial systems (e.g., polymer and polymer‐metal “interfaces”) and natural and mixed artificial–natural systems (e.g., the multilayer interphase of a biomedical system such as a dental implant). The approach presented demonstrates that “interphase” or “interface” depends to some extent on the point of view.