Zeta Potential and Size Analysis of Zeolitic Imidazolate Framework-8 Nanocrystals Prepared by Surfactant-Assisted Synthesis
Zeta Potential and Size Analysis of Zeolitic Imidazolate Framework-8 Nanocrystals Prepared by Surfactant-Assisted Synthesis
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DOI：
10.1021/acs.langmuir.3c03193
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发表时间：
2024-03
期刊：
影响因子：
3.9
通讯作者：
Tristan K Jongert;Ian A Slowinski;Benjamin Dao;Victor H Cortez;Thomas Gredig;Nestor D Plascencia
中科院分区：
文献类型：
--
作者：
Tristan K Jongert;Ian A Slowinski;Benjamin Dao;Victor H Cortez;Thomas Gredig;Nestor D Plascencia
采用时间分辨光动力学、电动力学和粉末X射线衍射方法研究了单分散金属有机骨架纳米粒子的晶体成核和生长机理。我们证实，沸石咪唑骨架-8（ZIF-8）纳米晶体遵循非经典的晶体生长途径，其中快速成核发生与致密的液体簇或纳米晶体形成自发时，两种前体混合。我们还探讨了zeta电位和溶剂动力学的大小变化的ZIF-8制备的表面活性剂辅助合成。研究了三种调节剂，包括1-甲基咪唑（1-MIm）、三（羟甲基）氨基甲烷（THAM）和（1-十六烷基）三甲基溴化铵（CTAB）。我们发现，1-mIm显着增加ZIF-8的成核速率。随着充当配位调节剂的1-mImm含量的增加，ZIF-8的尺寸增加，ZIF-8的zeta电位降低。而THAM作为配位和去质子化调节剂，同时增加ZIF-8的尺寸和zeta电位，CTAB作为长烷基阳离子表面活性剂，主要吸附在ZIF-8的表面上，并且所形成的ZIF-8的zeta电位由溶液中的CTAB的量与其临界胶束浓度相比来控制。总之，我们揭示了调制器类型和浓度可以用于控制胶体系统中分散的ZIF-8纳米晶体的尺寸和ζ电位。该实验还能够鉴定ZIF-8的成核和晶体生长过程。这一发现将适用于胶体体系中的其他纳米晶体，用于多相催化和客体分子负载。
The crystal nucleation and growth mechanism of monodispersed metal–organic framework nanoparticles were studied using time-resolved light dynamic, electrokinetic, and powder X-ray diffraction methods. We confirmed that zeolitic imidazolate framework-8 (ZIF-8) nanocrystals follow a nonclassical crystal growth pathway, where a fast nucleation occurs with dense liquid clusters or nanocrystals forming spontaneously when two precursors are mixed. We also explored the zeta potential and solvodynamic size changes of ZIF-8 prepared by a surfactant-assisted synthesis. Three modulators, including 1-methylimidazole (1-mIm), tris(hydroxymethyl)aminomethane (THAM), and (1-hexadecyl)trimethylammonium bromide (CTAB), were studied. We found that 1-mIm dramatically increases the rate of nucleation of ZIF-8. With an increasing amount of 1-mIm, which functions as a coordination modulator, the size increases, and the zeta potential of ZIF-8 decreases. Whereas THAM, as both a coordination and a deprotonation modulator, increases the size and zeta potential of ZIF-8 simultaneously, CTAB, as a long alkyl cationic surfactant, mainly adsorbs on the surface of ZIF-8, and the zeta potential of the formed ZIF-8 is controlled by the amount of CTAB in solution compared with its critical micelle concentration. Overall, we reveal that the modulator type and concentration can be used to control the size and zeta potential of the dispersed ZIF-8 nanocrystals in a colloid system. The experiments also enable identification of the nucleation and crystal growth processes of ZIF-8. The findings will be applicable to other nanocrystals in colloid systems, which are used for heterogeneous catalysis and guest molecular loadings.