Investigation of Nucleation and Growth at a Liquid-Liquid Interface by Solvent Exchange and Synchrotron Small-Angle X-Ray Scattering.
Investigation of Nucleation and Growth at a Liquid-Liquid Interface by Solvent Exchange and Synchrotron Small-Angle X-Ray Scattering.
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DOI：
10.3389/fchem.2021.593637
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发表时间：
2021
影响因子：
5.5
通讯作者：
Hohman JN
中科院分区：
文献类型：
--
作者：
Schriber EA;Rosenberg DJ;Kelly RP;Ghodsi A;Hohman JN
杂化纳米材料具有由无机元素和有机配体之间的自组装过程驱动的复杂结构。这些材料的性质通常可以通过有机配体的变化或通过交换无机元素来调节。这使得能够灵活地制造具有丰富多样特性的定制混合材料，以用于技术应用。液-液界面对于合成这些化合物是有用的，因为前体可以被分离并且允许仅在界面处相互作用。虽然程序上很简单，但这是一个复杂的反应，在一个不容易探测的环境中。在这里，我们探讨的界面结晶的mithrene，超分子多量子阱。这种材料在有机配体层之间夹有一个明确的银硫族化物层。控制mithrene晶体的大小和形态是有用的应用程序需要了解其晶体生长的细节，但这种反应的具体机制仍然只是轻微的研究。我们进行了一项研究的mithrene结晶在油-水界面，以阐明界面自由能如何影响成核和生长。根据溶剂粘度和表面张力的不同，对油溶剂进行了更换，改变了油的动态接触角和界面自由能。我们通过扫描电子显微镜（SEM）分离并表征了反应副产物。我们还开发了一种高通量小角X射线散射（SAXS）技术，以测量在短反应时间尺度（分钟）的结晶。我们的研究结果表明，修改界面能影响反应动力学和产品的尺寸均匀性和产率。我们的SAXS测量揭示了仅在15分钟后就开始结晶。这些结果为探索通过实验方法定向合成复杂材料提供了模板。
Hybrid nanomaterials possess complex architectures that are driven by a self-assembly process between an inorganic element and an organic ligand. The properties of these materials can often be tuned by organic ligand variation, or by swapping the inorganic element. This enables the flexible fabrication of tailored hybrid materials with a rich variety of properties for technological applications. Liquid-liquid interfaces are useful for synthesizing these compounds as precursors can be segregated and allowed to interact only at the interface. Although procedurally straightforward, this is a complex reaction in an environment that is not easy to probe. Here, we explore the interfacial crystallization of mithrene, a supramolecular multi-quantum well. This material sandwiches a well-defined silver-chalcogenide layer between layers of organic ligands. Controlling mithrene crystal size and morphology to be useful for applications requires understanding details of its crystal growth, but the specific mechanism for this reaction remain only lightly investigated. We performed a study of mithrene crystallization at an oil-water interfaces to elucidate how the interfacial free energy affects nucleation and growth. We exchanged the oil solvent on the basis of solvent viscosity and surface tension, modifying the dynamic contact angle and interfacial free energy. We isolated and characterized the reaction byproducts via scanning electron microscopy (SEM). We also developed a high-throughput small angle X-ray scattering (SAXS) technique to measure crystallization at short reaction timescales (minutes). Our results showed that modifying interfacial surface energy affects both the reaction kinetics and product size homogeneity and yield. Our SAXS measurements reveal the onset of crystallinity after only 15 min. These results provide a template for exploring directed synthesis of complex materials via experimental methods.
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DOI：
10.1007/978-1-62703-691-7_18
发表时间：
2014
期刊：
Methods in molecular biology (Clifton, N.J.)
影响因子：
--
作者：
Dyer, Kevin N;Hammel, Michal;Rambo, Robert P;Tsutakawa, Susan E;Rodic, Ivan;Classen, Scott;Tainer, John A;Hura, Greg L
通讯作者：
Hura, Greg L
影响因子：
2.5
作者：
Classen S;Rodic I;Holton J;Hura GL;Hammel M;Tainer JA
通讯作者：
Tainer JA
影响因子：
4.6
作者：
Veselska, Oleksandra;Dessal, Caroline;Demessence, Aude
通讯作者：
Demessence, Aude
影响因子：
4.9
作者：
Kumar, Ram;Jayaramulu, Kolleboyina;Rao, C. N. R.
通讯作者：
Rao, C. N. R.
影响因子：
16.6
作者：
Jodlowski, Alexander D.;Yepez, Alfonso;de Miguel, Gustavo
通讯作者：
de Miguel, Gustavo