Univ. Bordeaux, Laboratory of the Future, CNRS, Solvay, 33600, Pessac, France.
Univ. Bordeaux, Centre de Recherche Paul-Pascal, CNRS, 33400, Talence, France.
Sci Rep. 2023 Mar 29;13(1):5155. doi: 10.1038/s41598-023-32007-7.
We report on direct ink writing of a model yield-stress fluid and focus on the printability of the first layer, the one in contact with the supporting substrate. We observe a diversity of deposition morphologies that depends on a limited set of operational parameters, mainly ink flow rate, substrate speed and writing density, and also on material properties (e.g., yield-stress). Among these morphologies, one of them does not depend on fluid properties (as long as the fluid displays some yield-stress) and consists of flat films whose thickness is controllable in a significant range, about [Formula: see text] mm, and tunable in real time during printing. We thus demonstrate the ability to print films with thickness gradients and prove that the printing fidelity is mainly due to a competition between yield-stress and capillarity.
我们报告了一种模型触变流体的直写成型，并重点研究了与支撑基底接触的第一层的可印刷性。我们观察到了各种沉积形态，这些形态取决于有限的一组操作参数，主要是油墨流速、基底速度和书写密度，还取决于材料特性（例如屈服应力）。在这些形态中，有一种形态不依赖于流体特性（只要流体表现出一定的屈服应力），它由厚度可控的平坦薄膜组成，在约[Formula: see text]mm 的显著范围内可调，并且可以在打印过程中实时调整。因此，我们展示了打印具有厚度梯度的薄膜的能力，并证明了印刷保真度主要归因于屈服应力和毛细作用之间的竞争。
