Relatively monodispersed poly(diphenylamine)/polyaniline (PDPA/PANI) core/shell composite nanospheres were fabricated by an oxidative polymerization, both in the dispersed phase of diphenylamine and at the interface between the suspended and continuous phases. A reactive surfactant synthesized with aniline and sodium dodecyl sulfate was adopted. The fine core/shell structure formation via π-π stacking between the aromatic rings of PDPA and PANI was confirmed by analyzing the chemical composition, morphology, and crystallinity of the particle components. An electrorheological (ER) fluid was fabricated by suspending the PDPA/PANI nanoparticles in silicone oil, and its ER behaviors were characterized by the controlled shear stress and rate, dynamic oscillation, and on-off electrical field tests. The ER fluid under an electric field exhibited an immediate phase transition, viscoelasticity, and three measurement-dependent yield stresses. In addition, its stable shear stresses over a wide range of shear rates were fitted smoothly by the CCJ model and were shown to increase with increasing EF strength. Moreover, the dielectric characteristics and Cole-Cole analysis of the ER fluid confirmed the effective ER property. The PDPA/PANI-based ER fluid possessing an instantaneous and controllable electro-response is believed to be a promising system for intelligent control applications.

相对单分散的聚二苯胺/聚苯胺（PDPA / PANI）核/壳复合纳米球是通过氧化聚合在二苯胺的分散相以及悬浮相和连续相之间的界面上制备的。采用由苯胺和十二烷基硫酸钠合成的反应性表面活性剂。通过分析颗粒成分的化学组成，形态和结晶度，证实了通过PDPA和PANI的芳香环之间的π-π堆积形成的精细核/壳结构。通过将PDPA / PANI纳米颗粒悬浮在硅油中来制备电流变（ER）流体，并通过控制剪切应力和速率，动态振荡和开关电场测试来表征其ER行为。电场作用下的ER流体具有立即相变，粘弹性和三个与测量有关的屈服应力。此外，CCJ模型可以在很宽的剪切速率范围内平稳地拟合其稳定的剪切应力，并显示其随EF强度的增加而增加。而且，ER流体的介电特性和Cole-Cole分析证实了有效的ER性能。具有瞬时和可控电响应的基于PDPA / PANI的ER流体被认为是用于智能控制应用的有前途的系统。ER流体的介电特性和Cole-Cole分析证实了有效的ER性能。具有瞬时和可控电响应的基于PDPA / PANI的ER流体被认为是用于智能控制应用的有前途的系统。ER流体的介电特性和Cole-Cole分析证实了有效的ER性能。具有瞬时和可控电响应的基于PDPA / PANI的ER流体被认为是用于智能控制应用的有前途的系统。