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首页> 外文期刊>ACS applied materials & interfaces >Self-Limiting Electrospray Deposition for the Surface Modification of Additively Manufactured Parts
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Self-Limiting Electrospray Deposition for the Surface Modification of Additively Manufactured Parts

机译：自限制电喷雾沉积，用于橡皮制成件的表面改性

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Electrospray deposition (ESD) is a spray coating process that utilizes a high voltage to atomize a flowing solution into charged microdroplets. These self-repulsive droplets evaporate as they travel to a target substrate, depositing the solution solids. Our previous research investigated the conditions necessary to minimize charge dissipation and deposit a thickness-limited film that grows in area over time through self-limiting electrospray deposition. Such sprays possess the ability to conformally coat complex three-dimensional (3D) objects without changing the location of the spray needle or orientation of the object. This makes them ideally suited for the postprocessing of materials fabricated through additive manufacturing (AM), opening a paradigm of independent bulk and surface functionality. Having demonstrated 3D coating with film thickness in the range of 1-50 mu m on a variety of conductive objects, in this study, we employed model substrates to quantitatively study the technique's limits with regard to geometry and scale. Specifically, we examined the effectiveness of thickness-limited ESD for coating recessed features with gaps ranging from 50 mu m to 1 cm, as well as the ability to coat surfaces hidden from the line-of-sight of the spray needle. This was then extended to the coating of hydrogel structures printed by AM, demonstrating that coating could be conducted even into the body of the structures as a means to create hydrophobic surfaces without affecting the absorption-driven humidity response. Further, these coatings were robust enough to create superhydrophobicity in the entire structure, causing it to resist immersion in water.
机译：电喷雾沉积（ESD）是一种喷涂工艺，其利用高电压来雾化流过流入的微型电流。这些自我排斥液滴在向靶衬底行进时蒸发，沉积溶液固体。我们以前的研究调查了最小化电荷耗散的条件，并通过自限制电喷雾沉积随着时间的推移在区域中沉积在面积上生长的厚度限制薄膜。这种喷雾具有在不改变喷射针的位置或物体的取向的情况下共同涂覆复杂的三维（3D）物体的能力。这使得它们非常适合通过添加剂制造（AM）制造的材料的后处理，打开独立散装和表面功能的范例。在各种导电物体上展示了薄膜厚度的3D涂层，在这项研究中，我们采用了模型基板来定量地研究了该技术关于几何和规模的限制。具体地，我们检查了厚度限制ESD的有效性，用于涂覆凹陷的特征，间隙范围为50μm至1cm，以及涂覆从喷射针的视线隐藏的表面的能力。然后将其延伸到由AM印刷的水凝胶结构的涂层延伸，证明涂层也可以作为制造疏水表面的装置的装置进行，而不会影响吸收驱动的湿度反应。此外，这些涂层足够坚固，以在整个结构中产生超细侵害，导致其抵抗水中的浸泡。

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