Nanotecnologia - a construção e utilização de materiais, dispositivos e máquinas na escala nanométrica (atômica / molecular) (1 e 100 nanômetros(nm)), fazendo uso de propriedades únicas que ocorrem naquelas pequenas dimensões e, onde fenómenos singulares permitem novas aplicações
Objective:To demonstrate how the preparation (design) of a material can affect the final material properties and to provide an introduction to composites. Description: This is an experiment with various water to cement (w/c) ratios to determine the amount of water that should be added to a set amount of Portland cement and reinforcement to create a workable cement paste. · The students will evaluate the influence of the w/c ratio on the strength of their reinforced cement paste pucks. · The students will create a new mix design based on the results of the first round of pucks. ◊How much water should be added? ◊How much reinforcement should be added? · The students will evaluate the second mix design in terms of strength of their reinforced cement paste pucks.
Objective: to demonstrate how the motion of atoms under added heat can change the shape of metals Description: · During this demonstration, a nanoscale change is impacting the macroscale. · Shape-memory alloys return to their original shape when heated, while other alloys do not. · Nitinol wire, a shape-memory alloy, will be subjected to heat treatment. · Steel wire will also be subjected to heat treatment. · The behavior of the two wires will be compared and the mechanisms behind each behavior will be discussed.
Objective:To illustrate thermal shock and the effects of differing amounts of modifier on the properties of glass. Description: · Three different types of glass rods will be heated so that students can observe the amount of thermal shock that occurs. · Different formulas of glass affect the mechanical, electrical, chemical, optical, and thermal properties of the glasses that are produced. · The two most important properties that determine resistance to thermal shock in glass are thermal conductivity and coefficient of thermal expansion.