Fourier-transform rheology and printability maps of complex fluids for three-dimensional printing
Fourier-transform rheology and printability maps of complex fluids for three-dimensional printing
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DOI：
10.1063/5.0128658
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发表时间：
2023-01
影响因子：
4.6
通讯作者：
Esther García-Tuñón;R. Agrawal;B. Ling;D. Dennis
中科院分区：
文献类型：
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作者：
Esther García-Tuñón;R. Agrawal;B. Ling;D. Dennis
直接墨水书写（DIW）是一种三维（3D）打印技术，研究人员在从能源应用支架到生物打印等领域工作。DIW的主要优势在于它能够成型先进的材料，如果这些材料可以配制成满足印刷工艺要求的复杂流体。它们必须是非常剪切稀化的软固体，能够流过狭窄的喷嘴，在沉积时恢复其结构并保持预先设计的3D形状。配方设计和流变性至关重要，但由于需要高度专业化，这些方面可能会被忽略。这项工作提供了洞察复杂的屈服应力流体的流变性和印刷通过使用大振幅振荡剪切流变学的线性和非线性行为的研究。我们完善以前的协议，并开发工具来了解DIW配方的行为。我们将现有的数学框架应用于能源应用的碳基配方库。傅里叶变换分析能够量化高次谐波贡献的开始和上升。使用3D谐波图、应力-应变图和非线性的材料测量[傅立叶和切比雪夫系数、弹性模量[公式：见正文]）和非线性的无量纲指数（[公式：见正文]）]建立不同公式之间的定量比较。三维李萨如图提供了一种定性的替代解释屈服过渡。我们创建阿什比型印刷适性图来指导配方设计，并阐明不可印刷的配方具有独特的特征。这种对DIW屈服应力流体的见解与其他应用和技术相关：钻井液，凝胶，胶体和食品。
Direct ink writing (DIW) is a three-dimensional (3D) printing technique exploited by researchers working in fields from scaffolds for energy applications to bioprinting. DIW's main strength is that it enables shaping advanced materials, if these materials can be formulated into complex fluids that meet the demands of the printing process. They must be extremely shear thinning soft solids, able to flow through narrow nozzles, recovering their structure upon deposition and retaining the predesigned 3D shape. Formulation design and rheology are critical, but these aspects can be overlooked due to the high specialization required. This work provides insight on the rheology and printability of complex yield-stress fluids through the study of linear and nonlinear behaviors using large-amplitude oscillatory shear rheology. We refine previous protocols and develop tools to understand the behaviors of formulations for DIW. We apply an existing mathematical framework to a library of carbon-based formulations for energy applications. Fourier transform analysis enables quantifying the onset and rising of higher harmonic contributions. Quantitative comparisons between different formulations are established using 3D harmonics maps, stress–strain plots, and material measures of nonlinearities [Fourier and Chebyshev coefficients, elastic moduli [Formula: see text]), and dimensionless index of nonlinearity ([Formula: see text])]. 3D Lissajous plots provide a qualitative alternative to interpretate the yielding transition. We create Ashby-type printability maps to guide formulation design and elucidate that non-printable formulations show distinctive features. This insight on yield-stress fluids for DIW is relevant to other applications and technologies: drilling fluids, gels, colloids, and foods.