Lubricant-Infused Nanoparticulate Coatings Assembled by Layer-by-Layer Deposition
Lubricant-Infused Nanoparticulate Coatings Assembled by Layer-by-Layer Deposition
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DOI：
10.1002/adfm.201401289
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发表时间：
2014-11-12
影响因子：
19
通讯作者：
Aizenberg, Joanna
中科院分区：
文献类型：
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作者：
Sunny, Steffi;Vogel, Nicolas;Aizenberg, Joanna
全憎涂料的设计目的是排斥各种各样的液体，而不会在表面留下污渍。一种实用的涂层应具有稳定的驱避性，不干扰基材的颜色或透明度，理想情况下，可以通过简单的工艺沉积在任意形状的表面上。我们使用带负电荷的二氧化硅纳米颗粒和带正电荷的聚电解质逐层沉积（LbL）来创建纳米级的表面结构，这些结构被氟化硅烷进一步表面功能化，并被氟化油渗透，在不同材料和形状的表面形成光滑、高度排斥的涂层。我们发现，四个或更多的LbL循环引入了足够的表面粗糙度，可以有效地将润滑剂固定在纳米孔涂层中，并提供稳定的液体界面，可以排斥水、低表面张力液体和复杂流体。没有层次结构和小尺寸的二氧化硅纳米颗粒使涂层完全透明，透光率超过普通玻璃。该涂层机械坚固，暴露于连续流动数天后仍保持其驱避性，并防止吸附链霉亲和素作为模型蛋白。LbL工艺在概念上简单，成本低，环保，可扩展，可自动化，因此可能提供一种高效的合成途径，以获得无污染的材料。
Omniphobic coatings are designed to repel a wide range of liquids without leaving stains on the surface. A practical coating should exhibit stable repellency, show no interference with color or transparency of the underlying substrate and, ideally, be deposited in a simple process on arbitrarily shaped surfaces. We use layer-by-layer (LbL) deposition of negatively charged silica nanoparticles and positively charged polyelectrolytes to create nanoscale surface structures that are further surface-functionalized with fluorinated silanes and infiltrated with fluorinated oil, forming a smooth, highly repellent coating on surfaces of different materials and shapes. We show that four or more LbL cycles introduce sufficient surface roughness to effectively immobilize the lubricant into the nanoporous coating and provide a stable liquid interface that repels water, low-surface-tension liquids and complex fluids. The absence of hierarchical structures and the small size of the silica nanoparticles enables complete transparency of the coating, with light transmittance exceeding that of normal glass. The coating is mechanically robust, maintains its repellency after exposure to continuous flow for several days and prevents adsorption of streptavidin as a model protein. The LbL process is conceptually simple, of low cost, environmentally benign, scalable, automatable and therefore may present an efficient synthetic route to non-fouling materials.