Fabrication of Bioinspired Micro/Nano-Textured Surfaces Through Scalable Roll Coating Manufacturing
Fabrication of Bioinspired Micro/Nano-Textured Surfaces Through Scalable Roll Coating Manufacturing
复制标题
通过可扩展的辊涂制造制造仿生微/纳米纹理表面
DOI：
10.1115/1.4056732
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发表时间：
2022
影响因子：
1
通讯作者：
Ryu, Jong Eun
中科院分区：
文献类型：
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作者：
Black, Benjamin;Chockalingam, Sekkappan;Islam, Md Didarul;Liu, Sipan;Perera, Himendra;Khan, Saad;Ryu, Jong Eun
生物启发的微/纳米纹理表面具有多种应用，包括超疏水性、自清洁、防结冰、抗生物污染和减阻。本文研究了一种无模板、可规模化的微/纳米形貌表面制备辊涂工艺。这些微/纳米结构产生与粘弹性聚合物纳米复合材料，并通过控制肋不稳定性，在前进辊涂布。在剪切速率、毛细管数和表面粗糙度参数（例如，Wenzel因子和峰密度）。对于一个给定的剪切速率，样品的粗糙度增加与较高的毛细管数，直到一个阈值点。类似地，对于给定的毛细管数，粗糙度增加到与剪切速率相关的阈值范围。提出了一个峰值密度系数（PDC）模型，将毛细数和剪切速率与表面粗糙度联系起来。剪切速率和毛细管数的最佳范围分别为40-60 s-1和4.5 × 105-6 × 105。这导致最大Wenzel粗糙度因子为1.91，峰值密度为3.94 × 104（1/mm 2），水接触角（WCA）为128 °。
Bio-inspired, micro/nanotextured surfaces have a variety of applications including superhydrophobicity, self-cleaning, anti-icing, antibiofouling, and drag reduction. In this paper, a template-free and scalable roll coating process is studied for fabrication of micro/nanoscale topographies surfaces. These micro/nanoscale structures are generated with viscoelastic polymer nanocomposites and derived by controlling ribbing instabilities in forward roll coating. The relationship between process conditions and surface topography is studied in terms of shear rate, capillary number, and surface roughness parameters (e.g., Wenzel factor and the density of peaks). For a given shear rate, the sample roughness increased with a higher capillary number until a threshold point. Similarly, for a given capillary number, the roughness increased up to a threshold range associated with shear rate. A peak density coefficient (PDC) model is proposed to relate capillary number and shear rate to surface roughness. The optimum range of the shear rate and the capillary number was found to be 40–60 s−1and 4.5 × 105–6 × 105, respectively. This resulted in a maximum Wenzel roughness factor of 1.91, a peak density of 3.94 × 104(1/mm2), and a water contact angle (WCA) of 128 deg.