Liu Xingcen, Danglad-Flores José, Eickelmann Stephan, Sun Bingbing, Hao Jingcheng, Riegler Hans, Li Junbai
Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, China.
Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Potsdam 14424, Germany.
ACS Nano. 2022 Jul 26;16(7):10372-10382. doi: 10.1021/acsnano.2c00443. Epub 2022 Jul 5.
Ordered assemblies of the peptide diphenylalanine (FF) are produced and deposited on planar substrates. The FF aggregate growth is achieved through precipitation from aqueous ammonia solutions induced by solvent evaporation. The applied dip-coating technique confines the FF assembly growth to a narrow zone near the three-phase contact. The growth was observed online by optical microscopy and was investigated systematically as a function of the process parameters. Depending on the external gas flow (to influence solvent evaporation), the withdrawal speed, the initial FF, and the initial ammonia concentrations, FF forms long, straight, and rigid microfibers and/or shorter, curved nanofibers. Under certain process conditions, the FF fibers can also aggregate into stripes. These can be deposited as large arrays of uniform stripes with regular widths and spacings. Scenarios leading to the various types of fibers and the stripe formation are presented and discussed in view of the experimental findings.
肽二苯基丙氨酸（FF）的有序组装体被制备并沉积在平面基底上。FF聚集体的生长是通过溶剂蒸发诱导氨水溶液沉淀来实现的。所应用的浸涂技术将FF组装体的生长限制在三相接触附近的一个狭窄区域。通过光学显微镜在线观察生长情况，并系统地研究其作为工艺参数的函数。根据外部气流（影响溶剂蒸发）、提拉速度、初始FF和初始氨浓度，FF会形成长的、直的且刚性的微纤维和/或较短的、弯曲的纳米纤维。在特定工艺条件下，FF纤维也会聚集形成条纹。这些条纹可以沉积成具有规则宽度和间距的均匀条纹的大阵列。结合实验结果，展示并讨论了导致各种类型纤维和条纹形成的情况。
