Immobilization of magnetic iron oxide nanoparticles on laponite discs - an easy way to biocompatible ferrofluids and ferrogels.

Vassilios Tzitzios, Georgia Basina, Aristides Bakandritsos, Costas G Hadjipanayis, Hui Mao, Dimitrios Niarchos, George C Hadjipanayis, Jiri Tucek, Radek Zboril
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引用次数: 50

Abstract

Magnetic nanocomposites containing iron oxide (maghemite) nanoparticles, well embedded in a synthetic clay matrix (laponite) were prepared by a new one step chemical route and characterized by TEM, XRD, magnetization measurements, Mössbauer spectroscopy, DLS, and MRI measurements. The synthetic procedure leads to non-stoichiometric γ-Fe(2)O(3) with a controllable content in the nanocomposite. Magnetic nanoparticles incorporated in the diamagnetic clay matrix exhibit a mean diameter of 13 nm, superparamagnetic behavior with a high saturation magnetization achievable at low applied magnetic fields. In-field Mössbauer spectra and ZFC/FC magnetization curves reveal a perfect ferrimagnetic ordering within nanoparticles with negligible spin frustration and interparticle interactions due to the complete coating of maghemite surfaces by the nanocrystalline laponite matrix. Magnetic iron oxide nanoparticles embedded in laponite matrix exhibit strong T(2) weighted MRI contrast. The maghemite/laponite composite particles have 200 nm hydrodynamic diameter and form very stable hydrosols and/or hydrogels depending on their concentration in water.

Abstract Image

Abstract Image

Abstract Image

磁性氧化铁纳米颗粒在拉脱土圆盘上的固定化-一种生物相容性铁磁流体和铁凝胶的简单方法。
采用一种新的一步化学方法,将氧化铁(磁赤铁矿)纳米颗粒包埋在合成粘土基体(拉脱土)中,制备了磁性纳米复合材料,并通过TEM、XRD、磁化测量、Mössbauer光谱、DLS和MRI测量对其进行了表征。该合成过程生成了含量可控的非化学计量γ-Fe(2)O(3)纳米复合材料。磁性纳米颗粒掺入抗磁性粘土基质中,平均直径为13 nm,具有超顺磁性,在低外加磁场下具有高饱和磁化强度。现场Mössbauer光谱和ZFC/FC磁化曲线显示纳米颗粒内部具有完美的铁磁有序,可忽略自旋受挫和粒子间相互作用,这是由于纳米晶拉脱土基质完全覆盖了磁铁矿表面。磁性氧化铁纳米颗粒包埋在拉脱土基质中,表现出强烈的T(2)加权MRI对比。磁赤铁矿/拉脱石复合颗粒的水动力直径为200nm,根据其在水中的浓度不同,可形成非常稳定的水溶胶和/或水凝胶。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Materials Chemistry
Journal of Materials Chemistry 工程技术-材料科学:综合
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审稿时长
1.5 months
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