Measuring, Modeling, and Predicting the Magnetic Assembly Rate of 2D-Staggered Janus Particle Chains
Measuring, Modeling, and Predicting the Magnetic Assembly Rate of 2D-Staggered Janus Particle Chains
复制标题
测量、建模和预测二维交错 Janus 粒子链的磁组装率
DOI：
10.1021/acs.langmuir.9b00163
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发表时间：
2019
期刊：
影响因子：
3.9
通讯作者：
Kretzschmar, Ilona
中科院分区：
文献类型：
--
作者：
Long, Thomas W.;Córdova-Figueroa, Ubaldo M.;Kretzschmar, Ilona
用光学显微镜研究了准二维环境中，偶极矩从中心移动并垂直于Janus帽高度取向的磁性Janus粒子的组装，发现它符合一个考虑粒子偶极强度、粒子布朗动力学、初始浓度以及最重要的磁偶极移位的一般模型。粒子聚集体被视为长度和宽度取决于磁偶极子移动的扩散球柱体。一旦粒子聚集进入布朗力和偶极力相等的距离内，就会发生不可逆的聚集，该距离被定义为俘获距离。捕获距离模型被表示为任意长度、偶极强度和偶极位移的链的一般Smoluchowski凝聚速率核，从而允许对相关体系的聚集率进行预测。
The assembly of magnetic Janus particles in a quasi-two-dimensional environment with a dipole moment shifted from the center and oriented perpendicular to the Janus cap height is studied with optical microscopy and found to adhere to a general model accounting for the particle dipole strength, the particle Brownian dynamics, the initial concentration, and, most importantly, the magnetic dipole shift. The particle aggregates are treated as diffusing spherocylinders with length and width dependent on the magnetic dipole shift. Aggregation occurs irreversibly once particle aggregates enter within a distance at which Brownian and dipole forces are equal, defined as the capture distance. The capture distance model is expressed as a general Smoluchowski coagulation rate kernel for chains of an arbitrary length, dipole strength, and dipole shift, allowing for aggregation rate predictions for related systems.