Patil Mallikarjunagouda B, Mathad Shridhar N, Patil Arun Y, Al-Kheraif Abdulaziz Abdulah, Naik Sachin, Vellapally Sajith
Membrane Separation Division, Bharat Ratna Prof. C.N.R. Rao Research Centre, Basaveshwar Science College, Bagalkot, Karnataka, India.
Department of Engineering Physics, K.L.E. Institute of Technology, Hubballi, India.
Turk J Chem. 2024 Dec 25;49(3):293-309. doi: 10.55730/1300-0527.3730. eCollection 2025.
This study investigates the preparation and properties of aniline polymerized in situ onto a nanosized TiO surface to form core-shell nanoparticles at ambient temperatures. The in situ polymerization of aniline to polyaniline (PANI), in conjunction with the utilization of an anionic surfactant, was employed in this investigation. The prepared PANI-TiO core-shell nanoparticles were integrated with chitosan at a gravimetric ratio and cast as core-shell nanocomposite membranes. The nanocomposites were subjected to structural analysis using Fourier transform infrared spectroscopy and X-ray diffraction patterns. The surface morphologies of the PANI and its nanocomposites were analyzed using scanning electron microscopy. Direct current conductivity studies revealed three discrete tiers of conductivity intrinsic to a semiconductor material. The nanocomposite, comprising a chitosan membrane embedded with 4 wt.% PANI-TiO, demonstrated peak direct current conductivity of 5.7 S/cm. The properties of the core-shell nanocomposite membranes could be elucidated using cyclic voltammetry, a technique that allowed for the observation of redox peaks occurring at 0.94 V and 0.25 V. The presence of both peaks was due to the redox transition of the prepared nanocomposite membranes from a semiconducting to a conductive state. At room temperature, the hydrogen absorption capacity was approximately 4.5 wt.%, but when the temperature was raised to 65 °C, it doubled to about 7.5 wt.%. In comparison to other nanocomposites, the 4 wt.% PANI-TiO core-shell embedded chitosan membrane exhibited significantly higher absorption capacity of 10.5 wt.%.
本研究考察了在室温下苯胺原位聚合在纳米尺寸的TiO表面以形成核壳纳米颗粒的制备方法及其性质。本研究采用苯胺原位聚合成聚苯胺（PANI），并结合使用一种阴离子表面活性剂。将制备的PANI-TiO核壳纳米颗粒与壳聚糖按重量比混合，浇铸成核壳纳米复合膜。使用傅里叶变换红外光谱和X射线衍射图谱对纳米复合材料进行结构分析。使用扫描电子显微镜分析PANI及其纳米复合材料的表面形貌。直流电导率研究揭示了半导体材料固有的三个离散电导率层级。包含嵌入4 wt.% PANI-TiO的壳聚糖膜的纳米复合材料表现出5.7 S/cm的峰值直流电导率。可以使用循环伏安法阐明核壳纳米复合膜的性质，该技术能够观察到在0.94 V和0.25 V出现的氧化还原峰。这两个峰的出现是由于制备的纳米复合膜从半导体状态转变为导电状态时的氧化还原转变。在室温下，氢吸收容量约为4.5 wt.%，但当温度升至65 °C时，其翻倍至约7.5 wt.%。与其他纳米复合材料相比，嵌入4 wt.% PANI-TiO核壳的壳聚糖膜表现出显著更高的10.5 wt.%的吸收容量。
