BIOMAT Research Group, University of the Basque Country (UPV/EHU), Escuela de Ingeniería de Gipuzkoa, Plaza de Europa 1, 20018 Donostia-San Sebastián, Spain; Physics Centre of Minho and Porto Universities (CF-UM-UP) and Laboratory of Physics for Materials and Emergent Technologies, LapMET, University of Minho, 4710-057 Braga, Portugal.
BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain.
Int J Biol Macromol. 2024 Oct;277(Pt 2):134364. doi: 10.1016/j.ijbiomac.2024.134364. Epub 2024 Jul 31.
Taking into account that natural polymers are renewable and biodegradable, hybrid materials based on natural polymers are required for advanced technological applications with reduced environmental footprint. In this work, sustainable composites have been developed based on collagen as a polymeric matrix and different magnetic fillers, in order to tailor magnetic response. The composites were prepared by solution casting with 30 wt% of magnetite nanoparticles (FeO NPs), magnetite nanorods (FeO NRs) or cobalt ferrite nanoparticles (CoFeO NPs). It is shown that the magnetic filler type has no bearing on the morphology, physical-chemical, or thermal characteristics of the composites, whereas the mechanical properties are determined by the magnetic filler, leading to a reduction in tensile strength, with values of 4.95 MPa for FeO NPs, 9.20 MPa for FeO NRs and 5.21 MPa for CoFeO NPs containing samples. However, the highest magnetization saturation is obtained for FeO NPs (44 emu.g) and the higher coercive field for CoFeO NPs (2062 Oe). In order to prove functionality of the developed composites, a self-sensing magnetic actuator device has been developed with the composite film with CoFeO NPs, showing high stability over cycling.
考虑到天然聚合物是可再生和可生物降解的，基于天然聚合物的混合材料对于具有较小环境足迹的先进技术应用是必需的。在这项工作中，基于胶原蛋白作为聚合物基质和不同的磁性填料，开发了可持续复合材料，以调整磁响应。通过溶液浇铸制备了复合材料，其中含有 30wt%的磁铁矿纳米颗粒（FeO NPs）、磁铁矿纳米棒（FeO NRs）或钴铁氧体纳米颗粒（CoFeO NPs）。结果表明，磁性填料类型对复合材料的形态、物理化学或热特性没有影响，而力学性能由磁性填料决定，导致拉伸强度降低，其中 FeO NPs 为 4.95 MPa，FeO NRs 为 9.20 MPa，含 CoFeO NPs 的样品为 5.21 MPa。然而，FeO NPs 获得了最高的饱和磁化强度（44 emu·g），CoFeO NPs 获得了更高的矫顽力（2062 Oe）。为了证明所开发复合材料的功能性，用含 CoFeO NPs 的复合膜开发了一种自感应磁致动器装置，该装置在循环过程中表现出高稳定性。
