Synthesis of metal nanoparticles such as Fe, Ni, Cu, and Zn using the polyol process for the development of low environmental impact conductive inks, integrating sustainability analysis through life cycle assessment, toxicity evaluation, and biodegradability studies to design decision-making tools for green and circular electronics, with extensive expertise in the synthesis of iron oxide nanoparticles via hydrothermal, thermal decomposition, coprecipitation, and microwave-assisted techniques, along with the transfer of magnetic nanoparticles from organic to aqueous media using coatings like PMAO and DMSA, functionalization with biomolecules including glucose, proteins, and antibodies, and immobilization in porous supports such as zeolite, sepiolite, and silicon dioxide, supported by structural, morphological, and magnetic characterization to analyze particle size, shape, coating, and composition, combined with modeling of magnetic behavior (M(H), FC-ZFC) to extract parameters like magnetic size and blocking temperature, advancing the design of magnetic actuator excitation devices to stimulate receptors for magnetogenetic applications through COMSOL simulations and experimental force generation studies, investigating nanoparticle aggregation and degradation dynamics, evaluating heating capacity in magnetic and optical hyperthermia, and developing methods to measure specific loss power using calorimetric techniques, complemented by innovative tools for biodistribution, quantification, and transformation assessment of nanoparticles in complex biological matrices and animal models, and further contributing to ferroelectric ceramic research with the synthesis and analysis of PLZT relaxor systems, exploring the role of vacancies and lanthanum concentration on structural, dielectric, ferroelectric, and electromechanical properties, studying dielectric permittivity behavior using the Cole-Cole model, proposing simplified RLC equivalent circuit models, and evaluating electromechanical applications arising from their tunable multifunctional performance.