Zhao Qinfu, Liu Xinqian, Veldhuis Stephen, Zhitomirsky Igor
Department of Materials Science and Engineering, McMaster University, Hamilton, ON L8S 4L7, Canada.
Department of Mechanical Engineering, McMaster University, Hamilton, ON L8S 4L7, Canada.
Materials (Basel). 2021 Dec 20;14(24):7902. doi: 10.3390/ma14247902.
Polyvinylidene fluoride (PVDF) is an advanced functional polymer which exhibits excellent chemical and thermal stability, and good mechanical, piezoelectric and ferroelectic properties. This work opens a new strategy for the fabrication of nanocomposites, combining the functional properties of PVDF and advanced inorganic nanomaterials. Electrophoretic deposition (EPD) has been developed for the fabrication of films containing PVDF and nanoparticles of TiO, MnO and NiFeO. An important finding was the feasibility of EPD of electrically neutral PVDF and inorganic nanoparticles using caffeic acid (CA) and catechol violet (CV) as co-dispersants. The experiments revealed strong adsorption of CA and CV on PVDF and inorganic nanoparticles, which involved different mechanisms and facilitated particle dispersion, charging and deposition. The analysis of the deposition yield data, chemical structure of the dispersants and the microstructure and composition of the films provided an insight into the adsorption and dispersion mechanisms and the influence of deposition conditions on the deposition rate, film microstructure and composition. PVDF films provided the corrosion protection of stainless steel. Overcoming the limitations of other techniques, this investigation demonstrates a conceptually new approach for the fabrication of PVDF-NiFeO films, which showed superparamagnetic properties. The approach developed in this investigation offers versatile strategies for the EPD of advanced organic-inorganic nanocomposites.
聚偏氟乙烯（PVDF）是一种先进的功能聚合物，具有优异的化学和热稳定性，以及良好的机械、压电和铁电性能。这项工作为制备纳米复合材料开辟了一种新策略，将PVDF的功能特性与先进的无机纳米材料相结合。电泳沉积（EPD）已被用于制备含有PVDF以及TiO、MnO和NiFeO纳米颗粒的薄膜。一个重要发现是，使用咖啡酸（CA）和邻苯二酚紫（CV）作为共分散剂，对电中性的PVDF和无机纳米颗粒进行电泳沉积是可行的。实验表明，CA和CV在PVDF和无机纳米颗粒上有强烈吸附，这涉及不同机制，并促进了颗粒的分散、带电和沉积。对沉积产率数据、分散剂的化学结构以及薄膜的微观结构和组成进行分析，有助于深入了解吸附和分散机制，以及沉积条件对沉积速率、薄膜微观结构和组成的影响。PVDF薄膜对不锈钢起到了防腐保护作用。本研究克服了其他技术的局限性，展示了一种制备具有超顺磁性能的PVDF-NiFeO薄膜的全新概念方法。本研究中开发的方法为先进有机-无机纳米复合材料的电泳沉积提供了多种策略。
