aluspinna

Aluspinna is a term used in Estonian-language scientific and technical literature to denote the underlying surface on which another material is deposited or attached. The word is formed from alus meaning base and pind or pinna meaning surface. In geology, aluspinna refers to the basal surface or bedrock under a sedimentary layer, or the contact plane between strata, which can influence erosion, weathering, and diagenesis.

In materials science and engineering, aluspinna denotes the substrate for coatings, films, or microstructures. Substrate properties such as chemistry, roughness, planarity, cleanliness, and thermal expansion mismatch with the deposited material affect adhesion, microstructure, residual stress, and device performance.

In art conservation and archaeology, aluspinna describes the underlying support or backing surface of an object, such as a canvas, panel, plaster, or wall, which governs conservation strategy and vulnerability to deterioration. The term also appears in surface science to describe the underlying plane that supports a research sample.

Characterization of aluspinna typically involves non-destructive surface profiling to assess roughness and waviness, spectroscopy and composition analysis to determine chemical compatibility, and microscopic imaging to inspect interfaces. In practice, controlling the quality of the aluspinna is essential for reliable film formation, coating durability, and long-term stability of the assembled system.

See also: substrate, base surface, interfacial adhesion, thin-film growth.