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首页> 外文期刊>Applied Surface Science >The colloidal stability and core-shell structure of magnetite nanoparticles coated with alginate
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The colloidal stability and core-shell structure of magnetite nanoparticles coated with alginate

机译：海藻酸盐包覆的磁铁矿纳米粒子的胶体稳定性和核-壳结构

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摘要

The adsorption of alginate (Alg) onto the surface of in water dispersed Fe_3O_4 nanoparticles and zeta potential of alginate-coated Fe_3O_4 nanoparticles have been investigated to optimize the colloidal stability of Alg-coated Fe_3O_4 nanoparticles. The adsorption amount of Alg increased with the decrease of adsorption pH. The zeta potential of Fe_3O_4 nanoparticles shifted to a lower value after adsorption of Alg. The lower adsorption pH was the lower zeta potential of Fe_3O_4 nanoparticles became. The Alg-coated Fe_3O_4 nanoparticles were found to be stabilized by steric and electrostatic repulsions. Those prepared at pH 6 were not stable around pH 5, and those prepared at pH 4 became unstable at pH below 3.5. Alg of M_w 45 kDa was a little bit more adsorbed onto nanoparticles surface than that of M_w 24 kDa. An average Fe_3O_4 core size of 9.3 ±1.7 nm was found by transmission electronic microscopy. An average hydrodynamic diameter of 30-150 nm was measured by photon correlation spectroscopy. However, an average core size of 10 nm and an average hydrodynamic diameter of 38 nm were estimated from the magnetization curve of the concentrated magnetic fluids (MFs). The maximum available saturation magnetization of MFs was about 3.5 kA/m.
机译：研究了藻酸盐（Alg）在水中分散的Fe_3O_4纳米颗粒表面的吸附和藻酸盐涂层的Fe_3O_4纳米颗粒的ζ电势，以优化Alg涂层的Fe_3O_4纳米颗粒的胶体稳定性。 Alg的吸附量随pH值的降低而增加。吸附Alg后，Fe_3O_4纳米粒子的Zeta电位移至较低值。较低的吸附pH值是Fe_3O_4纳米颗粒的ζ电势较低。发现Alg涂覆的Fe_3O_4纳米颗粒通过空间和静电排斥而稳定。在pH 6下制备的那些在pH 5左右不稳定，而在pH 4下制备的那些在pH低于3.5时变得不稳定。与M_w 24 kDa相比，M_w 45 kDa的藻类吸附到纳米颗粒表面的程度更高。通过透射电子显微镜发现平均Fe_3O_4芯尺寸为9.3±1.7nm。通过光子相关光谱法测量了30-150nm的平均流体动力学直径。但是，根据浓缩磁流体（MFs）的磁化曲线估算出平均磁芯尺寸为10 nm，平均流体力学直径为38 nm。 MF的最大可用饱和磁化强度约为3.5 kA / m。

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