Abstract Structure characterizations of concentrated water-based magnetic fluids stabilized by oleic and lauric acids were done by means of small-angle neutron scattering (SANS) and complemented by dynamic light scattering and magnetization analysis. Stability of ferrofluids with time against sedimentation was concluded despite the presence of aggregates in solutions. Differences in the average sizes of individual polydisperse magnetite nanoparticles coated with surfactants and their aggregates were revealed. Structural parameters obtained from SANS have been confirmed by magnetogranulometry data. The comparative analysis of the aggregation and its change upon dilution is made basing on the data of SANS and dynamic light scattering techniques.

中文翻译：

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浓缩水性铁磁流体的结构表征

摘要 油酸和月桂酸稳定的浓缩水基磁性流体的结构表征是通过小角中子散射（SANS）完成的，并辅以动态光散射和磁化分析。尽管溶液中存在聚集体，但铁磁流体对沉降的稳定性随着时间的推移而得出结论。揭示了涂有表面活性剂的单个多分散磁铁矿纳米颗粒及其聚集体的平均尺寸的差异。从 SANS 获得的结构参数已通过磁粒度数据得到证实。基于 SANS 和动态光散射技术的数据，对聚集及其稀释后的变化进行了比较分析。