捕捉超顺磁胶体在时变磁场中的慢弛豫时间
Capturing the slow relaxation time of superparamagnetic colloids in time-varying fields
AI总结：
该研究通过测量旋转磁场中胶体间的有效势，发现超顺磁胶体存在比以往报道更长的磁弛豫时间，深化了对复杂磁场中胶体磁化机制的理解。
摘要：
超顺磁胶体因其磁弛豫特性，在时变磁场中展现出有趣的组装动力学和推进行为。然而，关于控制这种磁弛豫的机制知之甚少，该机制通常归因于胶体内分布的铁磁纳米颗粒之间的相互作用和多分散性。我们通过测量旋转磁场中胶体间的有效势来测定这种弛豫。值得注意的是，我们的结果表明存在比以往报道的磁弛豫时间长得多的情况，这进一步加深了我们对复杂磁场中胶体磁化过程的理解。
英文摘要：
Superparamagnetic colloids present interesting assembly dynamics and propulsion in time-varying magnetic fields due to their magnetic relaxation. However, little is known about the mechanisms governing this magnetic relaxation, which is commonly attributed to the interactions and polydispersity of the ferromagnetic nanoparticles distributed within the colloid. We measure this relaxation from the effective potential between colloids subjected to rotating magnetic fields. Remarkably, our results indicate the presence of magnetic relaxation times much longer than what has been reported, which furthers our understanding of the magnetization of colloids in complex magnetic fields.
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