The present Master Thesis work is a dissertation on the prototyping of the first colloidal thermomagnetic energy harvester. The research programme (CERES Project) has been conducted within the Center for Sustainable Future Technologies (CSFT) at Istituto Italiano di Tecnologia (IIT) of Turin. The three main phases reported here are: first, a description of the context and the physical background of this device, then, the experimental setup of the prototype, and finally, the analysis of the data collected as the output of the harvester. Moreover, a new matrix representation of the physical quantities involved is presented. The CERES paradigm exploits the incredible thermomagnetic properties of ferrofluids, a suspension of magnetic nanoparticles (NPs) dispersed in a fluid solvent.