Silver (Ag) nanoparticle has extremely high surface energy and it is difficult to find an efficient dispersant to prevent its agglomeration in suspensions. A new brush copolymer, succinic anhydride modified epoxy‐amine poly[(propylene oxide)‐co‐(ethylene oxide)]‐grafted polymer (EPOA), which can efficiently disperse concentrated aqueous suspensions of Ag nanoparticles is revealed. The dispersion efficiency of EPOA for the dispersion of a 60 nm‐Ag nanoparticles in aqueous suspension is studied by measuring its sedimentation and rheological behavior, and the results are compared with those of a commercially available dispersant, ammonium poly(acrylic acid) (PAA‐NH₄). Interactions between the dispersants and the Ag nanoparticles are characterized by zeta potential and adsorption analyses. Theoretical calculations are conducted to clarify the adsorption and the dominant dispersion stabilization mechanisms of the dispersants. Compared with PAA‐NH₄, EPOA obtains a higher stable suspension of Ag nanoparticles with less significant sedimentation over 1 month. The dispersion homogeneity of the suspension remains excellent even at an extremely high solid loading of 30–40 wt%. According to adsorption analysis, it is suggested that both EPOA and PAA‐NH₄ adsorb via single‐point attachment through the carboxyl group on the Ag surface. Based on theoretical calculations, the Ag nanoparticles are better stabilized by EPOA via an electrosteric dispersion mechanism.

中文翻译：

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使用刷式共聚物作为高效分散剂制备水性悬浮液中高度稳定的Ag纳米颗粒

银（Ag）纳米粒子具有极高的表面能，很难找到有效的分散剂来防止其在悬浮液中团聚。揭示了一种新型的刷式共聚物，即琥珀酸酐改性的环氧-胺聚[（环氧丙烷）-共-（环氧乙烷）]接枝聚合物（EPOA），它可以有效地分散银纳米颗粒的浓缩水悬浮液。通过测量其沉降和流变行为研究了EPOA在60 nm‐Ag纳米颗粒在水悬浮液中的分散效率，并将其结果与市售分散剂聚丙烯酸铵（PAA-）进行了比较NH ₄）。分散剂与Ag纳米颗粒之间的相互作用以zeta电位和吸附分析为特征。进行理论计算以阐明分散剂的吸附和主要的分散稳定机理。与PAA-NH ₄相比，EPOA获得了更高稳定性的Ag纳米颗粒悬浮液，并且在1个月内没有明显的沉淀。即使在30–40 wt％的极高固含量下，悬浮液的分散均匀性仍保持出色。根据吸附分析，建议这两个EPOA和PAA-NH ₄吸附经由通过银表面上的羧基的单点连接。根据理论计算，EPOA可以更好地稳定Ag纳米颗粒通过静电分散机制。