arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2501.04478cond-mat.mtrl-sci
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非晶三元相图分类学:相互作用参数的重要性

Taxonomy of amorphous ternary phase diagrams: the importance of interaction parameters

Yasin Ameslon, Hao Liu, Jens Harting, Olivier J. J. Ronsin, Olga Wodo

AI总结:

本研究通过系统筛选相互作用参数生成超8万个三元相图,识别出21种类型并分类,揭示常见类型及临界参数附近的不常见相图,为溶液加工和形态控制提供理论基础。

摘要:

理解相图对于材料选择和设计至关重要,因为它们提供了混合物热力学的全面表示。这项工作对代表聚合物、小有机分子和溶剂的非晶体系可能存在的三元相图进行了广泛而系统的概述。得益于计算高效的方法,基于对相互作用参数的系统筛选,生成了超过80,000个三元相图的空前库。识别出二十一种相图类型,包括此前未报道的类型。它们根据与不混溶材料对数量、混溶间隙数量以及三相区域数量相关的简单规则进行分类。这些相图被映射到三维相互作用参数空间中,提供了其可能性和存在条件的清晰图景。发现具有0、1、2或3个不混溶对的四种众所周知的相图类型最为常见。众多不常见的相图大多在临界相互作用参数值附近的小参数窗口内观察到。对于最常见的相图类型,我们表明在接近临界值时,可加工窗口的大小对相互作用参数变化变得敏感。这种敏感性随着材料摩尔尺寸的增加而降低。最后,模拟与实验相图的成功比较展示了这一理论分析的实际相关性。所呈现的结果为溶液加工条件的合理设计以及共混物形态控制奠定了坚实基础。直接应用包括有机薄膜和识别用于可持续加工的绿色溶剂。

英文摘要:

Understanding phase diagrams is essential for material selection and design, as they provide a comprehensive representation of the thermodynamics of mixtures. This work delivers a broad and systematic overview of possible ternary phase diagrams for amorphous systems representative of polymers, small organic molecules, and solvents. Thanks to computationally efficient methods, an unprecedented library of $>$80,000 ternary phase diagrams is generated based on a systematic screening of interaction parameters. Twenty-one phase diagram types, including unreported ones, are identified. They are classified according to simple rules related to the number of immiscible material pairs, of miscibility gaps, and of three-phase regions. They are mapped onto the three-dimensional interaction parameters space, providing a clear picture of their likelihood and existence conditions. Four well-known phase-diagram types with 0, 1, 2, or 3 immiscible pairs are found to be the most likely. The numerous uncommon phase diagrams are mostly observed within a small parameter window around the critical interaction parameter values. For the most common phase diagram types, we show that the size of the processability window becomes sensitive to interaction parameter variations close to critical values. The sensitivity decreases for materials with increasing molar size. Finally, successful comparisons of simulated and experimental phase diagrams showcase the real-world relevance of this theoretical analysis. The presented results lay a robust foundation for rational design of solution processing conditions and for blend morphology control. Immediate applications include organic thin films and the identification of green solvents for sustainable processing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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