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In the FAPESP Scientific Initiation Project (2008 / 50918-6), completed in 2009 and contemporary to a master's degree on the same subject, completed in 2010, the first prototype of an internally cooled toolholder by means of a phase-changing fluid was developed. Proceeding on this field, advances in this model were obtained through another master's research (2014) that counted with financial support from FAPESP. Due to the problems encountered and in the attempt to advance further more in the development of a machining refrigeration system in which it is possible to stop the use of cutting fluid, this project seeks to optimize the toolholder by means of solutions for a more efficient heat exchange in the region below the cutting tool. Constructively, the new toolholder has a nanofluid that circulates internally through its channels; application of an electric field in the thermal transfer region in order to optimize the heat removal from the cutting tool; a silver core with geometry more favorable to thermal transfer. The system operation is based on the circulation of the nanofluid to the vaporization chamber and, after being vaporized, it goes to the condenser and, finally, destined for the reservoir. Before the nanofluid returns to the vaporization chamber, it passes through an ultrasonic agitator to ensure the dispersion of the nanoparticles. This proposed system is characterized by being a closed system, without communication with the environment. For the phase change to occur more easily, a refrigerant of the type HCFC (R141b) whose saturation point is just above room temperature is used as the base fluid. Besides, tests using an electric field under the internal fluid, which it can increases its thermal conductivity, named electrohydrodynamics effect (EDH), is also proposed (AU)