Meera K, Ramesan M T
Centre for Polymer Science and Technology, Department of Chemistry, University of Calicut, Calicut University P.O., Malappuram, Kerala 673 635, India.
Centre for Polymer Science and Technology, Department of Chemistry, University of Calicut, Calicut University P.O., Malappuram, Kerala 673 635, India.
Int J Biol Macromol. 2025 Jul;318(Pt 2):144985. doi: 10.1016/j.ijbiomac.2025.144985. Epub 2025 Jun 6.
This work focused on fabricating bio-nanocomposite films from cashew gum (CG) and boehmite (BHM) using a water-based solution casting technique, followed by comprehensive characterization through various analytical techniques. XRD and FTIR analyses confirmed the presence of characteristic BHM peaks and its successful integration into the CG matrix. Tauc's plot revealed a decreasing optical bandgap with increasing BHM content, likely due to the introduction of new energy states and structural changes in the CG matrix. FE-SEM and HR-TEM revealed significant morphological changes in the composites, indicating effective dispersion and interaction between CG and BHM. The thermal stability of CG improves with increasing BHM nanoparticle loading. Mechanical testing showed a 47 % increase in tensile strength for the CG/5 wt% BHM film, with only a slight reduction in elongation at break. Electrical properties, including AC conductivity, dielectric constant, loss tangent, electric modulus, and impedance were evaluated across various frequencies and temperatures. AC conductivity increased with frequency, while dielectric constant and loss tangent decreased. Furthermore, the electrical parameters increased with temperature and were strongly influenced by the BHM content. Notably, the CG/5 wt% BHM nanocomposite exhibited the highest conductivity and dielectric constant at ambient temperature, approximately twofold and threefold greater, respectively, than pure CG. These results underscore the promising potential of CG/BHM bio-nanocomposites for use in flexible nano-dielectric devices and energy storage applications.
这项工作聚焦于使用水基溶液浇铸技术由腰果胶（CG）和勃姆石（BHM）制备生物纳米复合薄膜，随后通过各种分析技术进行全面表征。XRD和FTIR分析证实了特征性BHM峰的存在及其成功融入CG基体。陶氏图显示随着BHM含量增加光学带隙减小，这可能是由于CG基体中引入了新的能级和结构变化。FE-SEM和HR-TEM显示复合材料有显著的形态变化，表明CG和BHM之间有效分散且相互作用。随着BHM纳米颗粒负载量增加，CG的热稳定性提高。力学测试表明，CG/5 wt%BHM薄膜的拉伸强度提高了47%，而断裂伸长率仅略有降低。在不同频率和温度下评估了包括交流电导率、介电常数、损耗角正切、电模量和阻抗在内的电学性能。交流电导率随频率增加，而介电常数和损耗角正切降低。此外，电学参数随温度升高而增加，且受BHM含量的强烈影响。值得注意的是，CG/5 wt%BHM纳米复合材料在室温下表现出最高的电导率和介电常数，分别比纯CG大约高两倍和三倍。这些结果突出了CG/BHM生物纳米复合材料在柔性纳米介电器件和能量存储应用中的潜在应用前景。
