Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India.
ACS Biomater Sci Eng. 2021 Jun 14;7(6):2296-2308. doi: 10.1021/acsbiomaterials.1c00009. Epub 2021 May 4.
We report bioceramic composites of varying concentrations of BaSrTiO (BST) and Ca(PO)(OH) (HAP) for the analysis of electrical properties. The motivation is to predict the suitability of the composites for bio-electrets or the practical possibility in designing electro-active scaffolds. X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM) are used to analyze the microstructural evolution of the composites. A systematic variation in the grain and crystallite sizes is noticed from the FESEM and XRD, along with the presence of Sr(PO)(OH) (SAP). The temperature and frequency variations of the dielectric properties of the composites are studied. Modeling of the dielectric properties with the microstructural properties and at. % of the monolith BST is presented. Cole-Cole formalism is adopted to model the electrical behavior of the synthesized composites. Furthermore, the ac conductivity analysis reveals that Mott's variable range hopping (VRH) conduction is the most appropriate formalism that successfully describes the conduction process. The established Mott's VRH is also related to the polarization mechanisms active in the specimens. Our study projects a correlation between the electrical and biological properties by predicting the protein adsorption behavior from the perspective of impedance spectroscopy.
我们报告了不同浓度的 BaSrTiO（BST）和 Ca（PO）（OH）（HAP）生物陶瓷复合材料的电性能分析。动机是预测复合材料是否适合生物电介质或在设计电活性支架方面的实际可能性。X 射线衍射（XRD）和场发射扫描电子显微镜（FESEM）用于分析复合材料的微观结构演变。FESEM 和 XRD 都注意到晶粒和晶粒度的系统变化，同时还存在 Sr（PO）（OH）（SAP）。研究了复合材料的介电性能随温度和频率的变化。提出了用微观结构特性和块状 BST 的原子%来模拟介电性能的模型。采用 Cole-Cole 形式主义来模拟合成复合材料的电行为。此外，交流电导率分析表明，Mott 可变范围跳跃（VRH）传导是最合适的形式主义，成功地描述了传导过程。建立的 Mott VRH 也与样品中活跃的极化机制有关。我们的研究通过从阻抗谱的角度预测蛋白质吸附行为，预测了电性能和生物性能之间的相关性。
