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Synthesis and Mechanical Characterization of Magnetic Hybrid Materials with PVB as Polymeric Matrix for Micro-Actuation Applications Beatriz López-Walle1,2, Jesús Romo-Rico1,2, Jesús Puente-Córdova1,2 and Martín Reyes-Melo1,2 1

FIME, Universidad Autónoma de Nuevo León, Av. Universidad s/n, Ciudad Universitaria, C.P.

66451, San Nicolás de los Garza, N.L., México. 2

CIIDIT, Universidad Autónoma de Nuevo León, Avenida Alianza Sur 101, PIIT Monterrey,

C.P. 66600, Apodaca, N.L., México.

ABSTRACT This work presents two multifunctional magnetic hybrid materials with potential applications as micro-actuators. The first one consists of iron oxide (Fe2O3) nanoparticles embedded in polyvinyl butyral (PVB). For the second one, Fe2O3 nanoparticles, coated with carboxymethyl cellulose (CMC), were embedded in PVB. The main objective is to describe their synthesis and morphological and magnetic characterizations, and to evaluate their displacement against a variable magnetic field. The maximal displacement is obtained by the (Fe2O3CMC)/PVB beam-shaped structure (28.37 x 2.6 x 0.183 mm3) with 843 μm; the maximal electric power being 1.14 W. The levels of displacement induced in both hybrid materials as a response of the external magnetic field, besides the low electric power required, let us conclude that the studied materials could be considered as good candidates to micro-actuators applications. INTRODUCTION Hybrid materials are a very interesting topic for micro-actuator technologies. One important advance is the development of experimental techniques allowing two inherently incompatible materials to become compatible. This is possible by carrying out a premix of both materials in a molecular scale, before their conversion into a new hybrid material. Some of these hybrid materials can reversibly change their mechanical or physical properties in response to external stimuli. They should be called active materials and are exploited in a wide range of applications [1]. Magneto-active materials react in response to magnetic field gradients as driving force [2, 3]. Several magnetic micro-actuator systems have been reported by literature [4-10]. The displacements stated go from 17 µm to 700 µm, with an acting electrical current from 0.6 mA to 4 A. Previously, we have reported the characterization and the dynamic response of a bendingtype micro-actuator based on Fe2O3 nanoparticles (4 nm) embedded in Na-CMC [11], presenting a maximal displacement of 1.6 mm, and applying an electrical current of 1.4 A. Considering the hydrophilic condition of the CMC, a hydrophobic material, the polyvinyl butyral (PVB), is now used as polymeric matrix. Different polymeric matrixes provide different properties in the hybrid material, diversifying its possible actuating applications. The main objective of this work is to present two multifunctional magnetic hybrid materials, using PVB as polymeric matrix, which exhibit potential applications as micro-actuators. For the first one iron oxide (Fe2O3) nanoparticles are embedded in PVB; for the second one,