Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
Langmuir. 2011 Nov 15;27(22):13813-9. doi: 10.1021/la202796b. Epub 2011 Oct 19.
We report on modeling and experimental studies of the synthesis of opaque microparticles made via stop-flow lithography. Opaque magnetic beads and UV-absorbing dyes incorporated into hydrogel microparticles during synthesis changed the height and the degree of cross-linking of the polymer matrices formed. The effect of the concentration of these opaque materials on the particle height was determined experimentally and agreed well with model predictions based on the photopolymerization process over a wide range of UV absorbance. We also created particles with two independent anisotropies, magnetic and geometric, by applying magnetic fields during particle synthesis. Our work provides a platform for rational design of lithographic patterned opaque particles and also a new class of structured magnetic microparticles.
我们报告了通过停流光刻合成不透明微球的建模和实验研究。在合成过程中，不透明磁性珠和紫外吸收染料掺入水凝胶微球中，改变了形成的聚合物基质的高度和交联程度。实验确定了这些不透明材料的浓度对颗粒高度的影响，并且与基于宽紫外吸收率范围内的光聚合过程的模型预测非常吻合。我们还通过在颗粒合成过程中施加磁场，制得了具有两种独立各向异性（磁性和几何形状）的颗粒。我们的工作为光刻图案化不透明颗粒的合理设计提供了一个平台，同时也为一类新型结构磁性微球提供了一个平台。
