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Conservação e Restauro

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6 ECTS; 1º Ano, 2º Semestre, 30,0 T + 30,0 PL + 3,0 OT , Cód. 938089.

Lecturer
- Manuel Alberto Nogueira Henriques Rosa (1)(2)

(1) Docente Responsável
(2) Docente que lecciona

Prerequisites
Not applicable.

Objectives
The students should be able to describe chemical balances (acid-base, coordination and oxide-reduction)and identify these phenomena in artifacts and cultural property.

Program
Chemical equilibrium: General notions of chemical equilibrium; The equilibrium constant; The heterogeneous equilibrium; The quotient of the reaction; Factors affecting balance; Equilibria of solubility; Acid-base equilibria; Equilibria of complexation.
Ionic equilibrium (Acid-base): Bronstead-Lowry acid systems; Autoionization of water; Calculation of the concentrations of the hydrogen ion and the hydroxide ion; Criteria for acidic, basic and neutral solutions; The concept of pH; Solutions of strong acids and bases; PH measurement; Exemplification of pH measurement of solutions with pH meter, and universal indicators.
Complexity Equilibrium: History; General concepts about coordination compounds and complexes; Balance of formation of complexes; Most common complexes in CR practice; Conclusion.
Oxidation-reduction: Oxidation-reduction state; Oxidation-reduction concepts; writing and balancing of redox semi-reactions; writing of a complete redox reaction; Oxidant and reducer; Oxidation and reduction in organic compounds; Reduction potential; Galvanic or voltaic cells; Electrolytic cells; Corrosion of metals; Chemical cleaning by redox mechanisms; Final considerations.

Evaluation Methodology
Continuous assessment consists of four written tests (T1, T2, T3 and T4) and a report of a practical laboratory work (P) classified from 0 to 20 values. The final grade results from the average of the five assessments and must be equal to or greater than 10 values for approval.

Final continuous assessment grade=(T1+T2+T3+T4+P)/5

The presence in the practical laboratory class is mandatory, as well as the group writing of the report of the practical work performed.
In the Exam, Appeal Exam, Worker-Student Exam and Special Exam periods, students will be evaluated in a theoretical test (T) classified from 0 to 20 values, with the final grade resulting from the following weighting with the average grade obtained in the reports of the two practical assignments (P):

Final grade exams=T*0.8+P*0.2

Students approval is obtained when the exam final grade is equal to or greater than 10 values.

Bibliography
- Eastop, D. (1998). Chemical Principles of Textile Conservation. Oxford: Butterworth
- Mateini, M. e Moles, A. (1989). La Chimica nel Restauro. Roma: Nardini Ed.
- Wolbers, R. (2000). Cleaning Painted Surfaces: Aqueous methods. London: Archetype Publications

Teaching Method
Lectures, tutorials and laboratory classes.

Software used in class
Not applicable.

 

 

 


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