Furst E M, Gast A P
Department of Chemical Engineering, Stanford University, Stanford, California 94305-5025, USA.
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics. 2000 Jun;61(6 Pt B):6732-9. doi: 10.1103/physreve.61.6732.
We apply optical trapping techniques in a magnetorheological (MR) suspension, allowing us to directly measure the mechanical properties of single dipolar chains, such as the rupturing tensions and strains under tensile and lateral deformations. Our results are in excellent agreement with calculations of the rupturing tensions using a self-consistent point dipole model of the particle interaction that accounts for induction and multibody effects along the chain. Additionally, we observe the annealing of chain defects under an applied stress, such as the inclusion of neighboring particles into the chain. The micromechanical properties of single chains offers important insight into magnetorheology and electrorheology, especially the yield stress behavior.
我们在磁流变（MR）悬浮液中应用光镊技术，这使我们能够直接测量单个偶极链的力学性能，如拉伸和横向变形下的断裂张力和应变。我们的结果与使用考虑链上感应和多体效应的粒子相互作用自洽点偶极模型计算的断裂张力非常吻合。此外，我们观察到在施加应力下链缺陷的退火现象，例如相邻粒子并入链中。单链的微观力学性能为磁流变学和电流变学，尤其是屈服应力行为提供了重要的见解。
