Methyl–modified hybrid organic-inorganic coatings for the conservation of copper

A simple sol-gel technique for the preparation of methyl–modified silica coatings for the protection of the external surface of copper has been used in this study. Tetraethylorthosilicate (TEOS) has been used as a precursor to prepare nanosilica coatings on the surface of copper. The methyl–modified silica sols were obtained by mixing of 3% SiO₂ sol solution with trimethylchlorosilane (TMCS) or hexamethyldisilozane (HMDS) as basic materials. For comparison, the copper substrates were also coated with commercial polymers (Paraloid B 72, Plexisol P 550-40 and polyvinyl butyral (PVB)). The surface morphology changes of uncoated and coated specimens were investigated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The hydrophobicity of surfaces and photochemical ageing effects were evaluated by contact angle measurements. Potentiodynamic measurements were obtained in order to compare corrosion parameters of the coatings.     

Tools for assessing needs and impacts

The results of the ICCROM Forum 2013 on Conservation Science working group on Tools for assessing needs and impacts is presented. It is used as a starting point for a fundamental study of tools in general, tangible and intangible. The phenomenon of scientists and their organizations becoming defined by their tools, and unable to change when the needs of those they serve change, was noted by Kaplan in 1964. Part of the mechanism is the human tendency to solve any disagreement between new facts (like client needs) and old beliefs (such as the importance of one's toolset) by twisting the facts rather than the beliefs. Collins' proposal of three kinds of tacit knowledge, with collective tacit knowledge as the most difficult to make explicit, can explain common problems of interpretation and communication of assessments, and guide strategies for reliable tools. Kaufmann's ideas on the structuring of needs assessment by levels, and the distinction between macro outputs and mega outcomes, is combined with Maslow's five basic human needs, as well as the three pillars of sustainability, to produce an overall map of where needs assessment tools operate, and where conservation science organizations fit into this structure.     

Conservation of indigenous medicinal botanicals in Ekiti State, Nigeria

INTRODUCTION Ekiti State (about 7000 km2, Inland area) is situ- ated between 7°25′ and 8°20′ North and 5°00′ and 6°00′ East in the rainforest belt of southwestern Ni- geria (EKSG, 1997; Kayode, 1999; 2000). The state which was previously rich in botanicals is now being confronted with massive deforestation due to increase in population, urbanization, uncontrolled logging, lumber being used as fuel and developmental activi- ties since the state was created in 1996. Although stud…