ISM - CNR, Area della Ricerca di Roma 1, Via Salaria km 29.500, 00015 Monterotondo Scalo, Italy.
Ultrason Sonochem. 2012 Jul;19(4):877-82. doi: 10.1016/j.ultsonch.2011.12.007. Epub 2011 Dec 23.
Hydrophilic magnetite nanoparticles in the size range 30-10nm are easily and rapidly prepared under ultrasonic irradiation of Fe(OH)(2) in di- and tri-ethylene glycol/water solution with volume ratio varying between 7:3 and 3:7. Structural (XRD) and morphological (SEM) characterization reveal good crystalline and homogeneous particles whereas, when solvothermally prepared, the particles are inhomogeneous and aggregated. The sonochemically prepared particles are versatile, i.e. well suited to covalently bind molecules because of the free glycol hydroxylic groups on their surface or exchange the diethylene or triethylene glycol ligand. They can be easily transferred in hydrophobic solvents too. Room-temperature magnetic hysteresis properties measured by means of Vibrating Sample Magnetometer (VSM) display a nearly superparamagnetic character. The sonochemical preparation is easily scalable to meet industrial demand.
在超声辐照下，很容易在二甘醇/水（体积比为 7:3 至 3:7）溶液中快速制备出尺寸在 30-10nm 范围内的亲水性磁铁矿纳米粒子。结构（XRD）和形态（SEM）表征显示出良好的结晶性和均匀性颗粒，而在溶剂热条件下制备的颗粒则是不均匀和聚集的。超声化学制备的颗粒用途广泛，即由于表面游离的乙二醇羟基基团，很适合通过共价键结合分子，或者交换二甘醇或三甘醇配体。它们也可以很容易地转移到疏水性溶剂中。通过振动样品磁强计（VSM）测量的室温磁滞特性显示出近乎超顺磁性的特性。超声化学制备法很容易扩展规模以满足工业需求。
