自限电喷雾沉积，用于增材制造零件的表面改性。,ACS Applied Materials & Interfaces

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自限电喷雾沉积，用于增材制造零件的表面改性。
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-04-27 , DOI: 10.1021/acsami.9b23544
Dylan A Kovacevich ₁ , Lin Lei ₁ , Daehoon Han ₁ , Christianna Kuznetsova ₁ , Steven E Kooi ₂ , Howon Lee ₁ , Jonathan P Singer ₁

Affiliation

电喷雾沉积（ESD）是一种喷涂工艺，利用高压将流动的溶液雾化成带电的微滴。这些自排斥的液滴在行进到目标基材时会蒸发，从而沉积出溶液固体。我们先前的研究调查了使电荷耗散最小化并沉积厚度受限的膜所需的条件，该膜通过自限电喷雾沉积随时间推移而在面积上增长。这种喷雾剂具有保形地涂覆复杂的三维（3D）对象的能力，而无需改变喷针的位置或对象的方向。这使得它们非常适合通过增材制造（AM）制造的材料的后处理，从而打开了独立的体积和表面功能的范例。在各种导电物体上展示了膜厚在1-50μm范围内的3D涂层后，在本研究中，我们使用模型基底定量地研究了该技术在几何形状和尺寸方面的限制。具体而言，我们研究了厚度受限的ESD涂层对凹陷特征的有效性，该凹陷特征的间隙范围为50μm至1 cm，并且能够涂层从喷针视线隐藏的表面。然后将其扩展到由AM印刷的水凝胶结构的涂层，这表明该涂层甚至可以在结构体中进行，以形成疏水性表面而不影响吸收驱动的湿度响应。此外，这些涂料的强度足以在整个结构中产生超疏水性，

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Self-Limiting Electrospray Deposition for the Surface Modification of Additively Manufactured Parts.

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 μm 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 μm 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.

更新日期：2020-04-15

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