Cohen Avner P, Alesker Maria, Schofield Andrew B, Zitoun David, Sloutskin Eli
Physics Department and Institute of Nanotechnology & Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel.
Department of Chemistry and Institute of Nanotechnology & Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel.
Gels. 2016 Nov 16;2(4):29. doi: 10.3390/gels2040029.
Recently-developed photo-crosslinkable PMMA (polymethylmethacrylate) colloidal spheres are a highly promising system for fundamental studies in colloidal physics and may have a wide range of future technological applications. We synthesize these colloids and characterize their size distribution. Their swelling in a density- and index- matching organic solvent system is demonstrated and we employ dynamic light scattering (DLS), as also the recently-developed confocal differential dynamic microscopy (ConDDM), to characterize the structure and the dynamics of a fluid bulk suspension of such colloids at different particle densities, detecting significant particle charging effects. We stretch these photo-crosslinkable spheres into ellipsoids. The fact that the ellipsoids are cross-linked allows them to be fluorescently stained, permitting a dense suspension of ellipsoids, a simple model of fluid matter, to be imaged by direct confocal microscopy.
最近开发的可光交联聚甲基丙烯酸甲酯（PMMA）胶体球是胶体物理学基础研究中一个非常有前景的体系，并且可能在未来有广泛的技术应用。我们合成了这些胶体并表征了它们的尺寸分布。展示了它们在密度和折射率匹配的有机溶剂体系中的溶胀情况，我们采用动态光散射（DLS）以及最近开发的共聚焦差分动态显微镜（ConDDM）来表征这种胶体在不同颗粒密度下的流体本体悬浮液的结构和动力学，检测到显著的颗粒带电效应。我们将这些可光交联球体拉伸成椭球体。椭球体是交联的这一事实使得它们能够被荧光染色，从而可以通过直接共聚焦显微镜对密集的椭球体悬浮液（一种简单的流体物质模型）进行成像。
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