Chao Kung-Po, Bagaria Hitesh, Wong Michael S, Biswal Sibani L
Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX 77005, USA.
J Colloid Interface Sci. 2012 Jul 15;378(1):58-63. doi: 10.1016/j.jcis.2012.04.028. Epub 2012 Apr 21.
Surfactants have been widely used as templating agents to pattern the orientation of nanoparticles of various conformations. Here we report the use of a lipid, 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC), as a template to order CdSe tetrapods (TPs) at the air/water interface using a Langmuir-Blodgett trough. The surface pressure versus area isotherms for CdSe TPs and CdSe TPs/POPC are examined and monitored by Brewster angle microscopy (BAM). The transferred thin films are further characterized by transmission electron microscopy (TEM) and atomic force microscopy (AFM). Initially disc-like structures containing randomly oriented TPs form during solvent evaporation. Upon decreasing surface area, these discs merge into larger continental structures. In a mixed CdSe TPs/POPC system, these discs organize into wire-like networks upon compression. We detail how lipid molecules can be used to direct the two-dimensional assembly of TPs.
表面活性剂已被广泛用作模板剂，用于使各种构象的纳米颗粒定向排列。在此，我们报告了使用脂质1-棕榈酰-2-油酰-sn-甘油-3-磷酸胆碱（POPC）作为模板，利用Langmuir-Blodgett槽在空气/水界面上对CdSe四足体（TPs）进行有序排列。通过布鲁斯特角显微镜（BAM）对CdSe TPs和CdSe TPs/POPC的表面压力与面积等温线进行了检测和监测。通过透射电子显微镜（TEM）和原子力显微镜（AFM）对转移的薄膜进行了进一步表征。在溶剂蒸发过程中，最初会形成包含随机取向TPs的盘状结构。随着表面积的减小，这些盘会合并成更大的连续结构。在混合的CdSe TPs/POPC系统中，这些盘在压缩时会组织成线状网络。我们详细阐述了脂质分子如何用于指导TPs的二维组装。
