Synthesis of size-controlled hollow Fe3O4 nanospheres and their growth mechanism

Publication date: Available online 23 July 2019Source: ParticuologyAuthor(s): Lei Shi, Yurong He, Yanwei Hu, Xinzhi Wang, Baocheng Jiang, Yimin HuangAbstractSize-controlled hollow Fe3O4 nanospheres were synthesized via a one-pot hydrothermal method as a function of reaction time and sodium citrate, polyacrylamide, and urea content. Multiple characterization techniques such as scanning and transmission electron microscopy and Raman spectroscopy were employed to investigate the crystal structure and morphology of the obtained nanospheres. The Fe3O4 nanosphere formation mechanism was elucidated from analyzing the characterization data. High levels of sodium citrate and longer reaction times were observed to increase the diameter of the nanospheres until hollow structures formed. Furthermore, polyacrylamide and urea promoted the formation of hollow structures. The hollow-structured Fe3O4 nanospheres exhibited high magnetization saturation values in the range of 48.8–58.7 emu/g. The facile synthesis method described herein, to generate size-controlled Fe3O4 nanospheres with tailored properties, demonstrates potential across a wide range of fields from drug-delivery and stealth devices, to environmental and energy applications.Graphical abstract
Source: Particuology - Category: Science Source Type: research

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We examined whether advanced MRI analysis techniques have the capacity to detect brain injury (particularly white matter injury) caused by chronic hypoxia-induced fetal growth restriction in newborn preterm lambs.MethodsSurgery was undertaken in twin bearing pregnant ewes at 88–90 days gestation (term = 150 days) to induce FGR in one fetus. At 127 days gestation (~32 weeks human brain development), FGR and control (appropriate for gestational age, AGA) lambs were delivered by caesarean section, intubated and ventilated. Conventional and advanced brain imaging was conducted within the first two hours of li...
Source: NeuroImage: Clinical - Category: Radiology Source Type: research
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Source: RETINA - Category: Opthalmology Tags: Original Study Source Type: research
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Source: RETINA - Category: Opthalmology Tags: Original Study Source Type: research
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Source: The Lancet Neurology - Category: Neurology Source Type: research
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Source: International Journal of Pharmaceutics - Category: Drugs & Pharmacology Source Type: research
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