Projeto e execução de equipamento para medição de ângulo de contato de líquidos em superfícies sólidas

Abstract

This work aims to study, design and installation of a prototype to be used to get the exact angle that generates when certain liquid comes in contact with the surface to be tested. Their utility includes several areas, for example, analysis of wettability of materials, studies in the chemical analysis of substances and wettability of soils. It is a box made of open steel in its lower part, where the test will be done. A microscope set at its top and with the enlarged image in the required quantity is responsible for capturing the image of the drop that had deposited on the surface. This image is displayed directly on the computer, using software, it is possible to calculate exactly where the contact angle formed between the liquid and the surface. A microsyringe is used to deposit the liquid to be tested as soon as the drop touches the surface microsyringe is removed, completing the deposit process drop. With the process complete, the record of the trial is held. This equipment is widely used for teaching purposes, since their results were quite satisfactory, with obtaining high quality images that allow the accurate realization of the contact angle formed in this type of test and measurement has great relevance in the study of materials and their wettability and in the field of analytical chemistry.