Tian Maozhang, Chen Xi, Zhang Qun, Zou Xinyuan, Ma Desheng, Xuan Jiaming, Wang Wentao, Cao Meiwen
State Key Laboratory of Enhanced Oil Recovery, Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083, China.
State Key Laboratory of Heavy Oil Processing, Department of Biological and Energy Chemical Engineering, College of Chemical Engineering, China University of Petroleum (East China), 66 Changjiang West Road, Qingdao 266580, China.
Nanomaterials (Basel). 2021 Oct 12;11(10):2665. doi: 10.3390/nano11102665.
Three amphiphilic peptides with varied molecular hydrophobicity, charge number and charge location have been designed as regulators to modulate the crystal growth of zeolitic imidazolate framework-8 (ZIF-8). All three peptides can interact with ZIF-8 to inhibit {100} facet growth and produce truncated cubic crystals. The peptide's molecular hydrophobicity plays a dominant role in defining the final morphology and size of the ZIF-8 crystals. The peptides with less charge and higher hydrophobicity can promote nuclei formation and crystal growth to give smaller ZIF-8 crystals. However, the charge located in the center of the molecular hydrophobic region has little effect on the crystal nucleation and growth due to the shielding of its charge by molecular aggregation. The study provides insights into the effect of molecular charge and hydrophobicity on ZIF-8 crystal growth and is helpful for guiding the molecular design for regulating the synthesis of metal-organic framework materials.
设计了三种具有不同分子疏水性、电荷数和电荷位置的两亲性肽作为调节剂，以调控沸石咪唑酯骨架-8（ZIF-8）的晶体生长。这三种肽均能与ZIF-8相互作用，抑制{100}面生长并生成截角立方晶体。肽的分子疏水性在决定ZIF-8晶体的最终形态和尺寸方面起主导作用。电荷较少且疏水性较高的肽可促进成核和晶体生长，从而生成较小的ZIF-8晶体。然而，位于分子疏水区域中心的电荷由于其电荷被分子聚集所屏蔽，对晶体成核和生长影响不大。该研究为分子电荷和疏水性对ZIF-8晶体生长的影响提供了见解，有助于指导调控金属有机骨架材料合成的分子设计。
