Silver nanopowders (nano-Ag) have extremely high surface energy and are generally difficult to have an effective dispersant for their dispersion stabilization. This study proposes two brush copolymers that show a strong preference for adsorption on the nano-Ag surface via their backbone, while their side chains extend into the dispersion solvent for particle stabilization. After adding only 5 wt % (based on the mass of nano-Ag) of the proposed dispersants, the nano-Ag particles can be stably suspended without settling for at least 2 months. Besides, 5 wt % of these dispersants can well stabilize at least 40 wt % nano-Ag dispersed in di(ethylene glycol) ethyl ether, which is a common solvent for conductive inks and pastes. For applications, a thin film cast using the dispersed nano-Ag shows greatly improved surface flatness as compared to that made without the dispersant, and a low electrical resistivity of 2 × 10^–5 Ω cm is obtained after the film is annealed at 170 °C for 20 min.

中文翻译：

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新的刷式共聚物，作为稳定纳米银浓缩悬浮液的有效分散剂

银纳米粉（纳米银）具有极高的表面能，通常难以为其分散体稳定性提供有效的分散剂。这项研究提出了两种刷式共聚物，它们表现出强烈的偏好，即通过它们的主链，而它们的侧链则延伸到分散溶剂中以稳定颗粒。在仅添加5重量％（基于纳米银的质量）的所提出的分散剂之后，纳米银颗粒可以稳定地悬浮而不沉降至少2个月。此外，这些分散剂的5wt％可以很好地稳定分散在二（乙二醇）乙醚中的至少40wt％的纳米Ag，二（乙二醇）乙醚是用于导电油墨和浆料的常见溶剂。对于应用，与不使用分散剂的情况相比，使用分散的纳米银的流延薄膜显示出大大改善的表面平整度，并且在170°C退火后获得的电阻率为2×10 ^–5Ωcm C 20分钟。