Microgel colloidal crystals
Microgel colloidal crystals
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DOI：
10.1021/jp048486j
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发表时间：
2004-12-16
影响因子：
3.3
通讯作者：
Serpe, MJ
中科院分区：
文献类型：
--
作者：
Lyon, LA;Debord, JD;Serpe, MJ
由热敏聚合物聚（n -异丙基丙烯酰胺）组成的刺激敏感水凝胶颗粒组装而成的胶体晶体由于其相互作用势的固有“柔软性”以及颗粒热敏性而表现出不同寻常的相行为。在这篇文章中，我们回顾了我们小组的结果，说明了在胶体晶体的构建中使用这种软球构建块。首先，我们描述了温度诱导的体积相变在控制胶体晶体的结晶和熔化中的作用。这些方法使研究某些类型微凝胶的复杂相行为成为可能。例如，有人提出粒子之间的多重弱吸引相互作用可以在粒子浓度远低于硬球冰点时驱动结晶。最后，介绍了软球晶体在新型光子材料开发中的应用，并举例说明了基于光热定向结晶方法的胶体晶体的激光直写和光图案。
Colloidal crystals assembled from stimuli-sensitive hydrogel particles composed largely of the thermoresponsive polymer poly(N-isopropylacrylamide) display unusual phase behavior because of the inherent "softness" of their interaction potentials as well as the particle thermoresponsivity. In this contribution, we review results from our group that illustrate the use of such soft-sphere building blocks in the construction of colloidal crystals. First, we describe the utility of temperature-induced volume phase transitions in controlling the crystallization and melting of the colloidal crystals. These methods then enable the study of the complex phase behavior of certain types of microgels. For example, it is proposed that multiple weak attractive interactions between particles can drive crystallization at particle concentrations well below the hard-sphere freezing point. Finally, the utility of soft-sphere crystals in the development of new photonic materials is presented in examples of laser direct writing and photopatterning of colloidal crystals based on a photothermally directed crystallization method.