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Complex adsorption phenomena (see Adamson (1997), Further Suggested Reading section) are the result of different types of physical interactions at the interface that we can broadly group into the following. 1. Physisorption: a process prompted by van der Waals interactions between the molecules at the interface and the surface. This phenomenon is therefore associated with weak adsorption energies and it is the prevailing process at low temperatures. The molecules coming from the vapour phase collide with the surface but they are free to diffuse at the solid–air interface in search of energetically favourable surface sites.

18. 16 A liquid phase immersed in a fluid (gas or liquid) wets a solid surface, defining the contact angle. 17 Water interacts with differently coated fabrics. 18 21 Wetting of water on different solid surfaces. The contact angle of water as a wetting index: a large contact angle implies poor wetting properties of the solid. This behaviour reflects the fact that a liquid drop on a solid surface may adhere and spread differently depending on the nature of the solid surface and of the liquid. 3, now we will explore the range of intermediate cases where wetting can be only partial.

The last two factors are difficult to monitor exhaustively and have often been overlooked, although their effect on the surface of a work of art can be quite devastating. Among the works mostly affected by the aggression of polluted urban areas stand doors and gates of monuments and historical buildings. 23 (left) Protection of an underwater wall along a Venetian Canal. (right) Detail of the Canal wall after water removal. 24 (left) Baptistery in Piazza San Giovanni in Florence; (right) the North Gate, where bronze replicas were located at different heights and orientations, to gain differential protection from water.

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Akin On the Conservation of Force


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