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ÔĶÁÎÄÏס°Superparamagnetic Magnetite Colloidal Nanocrystal Clusters¡±Ê±Óöµ½Ò»¾ä»°Àí½â²»ÁË£¬ÌرðÊÇ×îºóÒ»¾ä»°£¬Ï£Íû´ó¼Ò°ïÎÒ·ÖÎöһϣ¬²»Òªµ¥´¿µÄ·­Òëѽ
¡£Herein we report the synthesis of highly water dispersible magnetite (Fe3O4)colloidal nanocrystal clusters (CNCs) with uniform size from about 30 to about 180 nm,each of which is composed of many single magnetite crystallites approximately 10 nm in size. The CNCs show superparamagnetic properties at room temper-ature,whereas a single-crystalline magnetite particle within the same size range would exhibit ferromagnetic behavior.Apparently,the magnetic interactions among crystallites within a CNC are perturbed sufficiently from the case of a single-crystalline particle that the superparamagnetic¨Cferro-magnetic transition is suppressed.
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