Bari Sarang, Chatterjee Aniruddha, Mishra Satyendra
University Institute of Chemical Technology, North Maharashtra University, Jalgaon 425001, Maharashtra, India.
University Institute of Chemical Technology, North Maharashtra University, Jalgaon 425001, Maharashtra, India.
Ultrason Sonochem. 2016 Jul;31:39-50. doi: 10.1016/j.ultsonch.2015.11.024. Epub 2015 Nov 25.
Calcium sulfate (CaSO4) nano-dendrimers were fabricated successfully via ultrasonic irradiation method using calcium chloride [CaCl2] and ammonium per sulfate [(NH4)2SO4] as precursors in aqueous solution by using cetyl trimethyl ammonium bromide (CTAB) as chemical surfactants. Diffusion-induced branching growth mechanism (DIBGM), influenced with the action of head-group and hydrocarbon chain effect of cationic surfactants, was the backbone in the formation of CaSO4 nano-dendrites. Fourier Transform Infra-red Spectroscopy (FTIR), X-Ray powder Diffraction (XRD), Atomic Emission Spectroscopy (AES), Selected Area Electron Diffraction (SAED), Field-Emission Scanning Electron Microscopy (FE-SEM), Energy-Dispersive Spectroscopy (EDS), Dynamic Light Spectroscopy (DLS) and BET surface area analyzer were used to characterize the products. Results obtained were compared with conventional stirring method that proved the superiority of sonication method to obtain well-crystalline nanostructures. Also, surfactant concentration, sonication frequency and time were noticed as the critical factors to generate such absolute morphologies at nano-crystalline size.
通过超声辐照法，以氯化钙[CaCl₂]和过硫酸铵[(NH₄)₂SO₄]为前驱体，在水溶液中使用十六烷基三甲基溴化铵（CTAB）作为化学表面活性剂，成功制备了硫酸钙（CaSO₄）纳米树枝状聚合物。扩散诱导分支生长机制（DIBGM）受阳离子表面活性剂的头基作用和烃链效应影响，是CaSO₄纳米树枝状晶体形成的关键。采用傅里叶变换红外光谱（FTIR）、X射线粉末衍射（XRD）、原子发射光谱（AES）、选区电子衍射（SAED）、场发射扫描电子显微镜（FE-SEM）、能量色散光谱（EDS）、动态光散射光谱（DLS）和BET比表面积分析仪对产物进行表征。将所得结果与传统搅拌法进行比较，证明了超声法在获得结晶良好的纳米结构方面的优越性。此外，表面活性剂浓度、超声频率和时间被视为在纳米晶体尺寸下产生这种完美形态的关键因素。
