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Solvent-Free Synthesis of a Superamphiphobic Surface by Green Chemistry
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2019-07-16 , DOI: 10.1021/acsapm.9b00322
Salih Ozbay 1 , Ugur Cengiz 1, 2 , H. Yildirim Erbil 1
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2019-07-16 , DOI: 10.1021/acsapm.9b00322
Salih Ozbay 1 , Ugur Cengiz 1, 2 , H. Yildirim Erbil 1
Affiliation
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A superamphiphobic surface having both water and oil repellence was prepared by applying a solvent-free surface coating method using liquid-CO2 in the scope of “green chemistry”. Poly(perfluoroalkyl ethyl acrylate) homopolymer was synthesized by a free radical polymerization in supercritical CO2 medium. This polymer was dissolved in liquid-CO2 containing hydrophilic nanosilica particles in a stirred stainless steel reactor at room temperature under a low CO2 pressure. The polymer/nanosilica dispersion was used to coat glass slides located horizontally in a stainless steel tube by using the “free meniscus coating” method. A series of superamphiphobic coatings were formed under different coating conditions with the variation of polymer/nanosilica concentrations, the types of nanosilica powders, system pressures, and degassing flow rates. The highest apparent water contact angle was 173° and the hexadecane contact angle was 169° on these superamphiphobic hybrid coatings with roll-off angles that were <7°. Such superamphiphobic surfaces have a large potential in biomedical applications for the preservation of small amounts of bioliquids during analysis. In a parallel study, a superhydrophobic surface without containing any nanosilica powder was also obtained by applying the “rapid expansion supercritical solution” method. Polyperfluoroacrylate polymer was dissolved in supercritical CO2 and was sprayed onto glass slides that were previously coated with a polyacrylate adhesive layer. The water contact angles were larger than 170° on this superhydrophobic coating. To optimize the coating conditions, the cloud point pressures of polyperfluoroacrylate polymer in sc-CO2 were determined at various polymer concentrations and temperatures for this purpose.
中文翻译：
通过绿色化学无溶剂合成超疏水表面
在“绿色化学”的范围内，通过使用使用液态CO 2的无溶剂表面涂覆方法，来制备具有拒水性和拒油性的超疏油性表面。在超临界CO 2介质中通过自由基聚合反应合成了聚（丙烯酸全氟烷基乙酯）均聚物。在室温下，在低CO 2下，在搅拌的不锈钢反应器中将该聚合物溶解在含有液态CO 2的亲水性纳米二氧化硅颗粒中压力。通过使用“自由弯月面涂覆”方法，使用聚合物/纳米二氧化硅分散体涂覆水平放置在不锈钢管中的载玻片。随着聚合物/纳米二氧化硅浓度，纳米二氧化硅粉末类型，系统压力和脱气流速的变化，在不同的涂层条件下形成了一系列超疏水涂层。在这些超两性杂化涂层中，最大的表观水接触角为173°，十六烷接触角为169°，滚落角小于7°。这样的超疏水表面在生物医学应用中具有很大的潜力，可以在分析过程中保存少量的生物液体。在平行研究中 通过应用“快速膨胀超临界溶液”方法，也可以获得不含任何纳米二氧化硅粉末的超疏水表面。将聚全氟丙烯酸酯聚合物溶解在超临界CO中如图2所示，将其喷涂到预先涂有聚丙烯酸酯粘合剂层的载玻片上。在该超疏水涂层上，水接触角大于170°。为了优化涂覆条件，为此目的，在各种聚合物浓度和温度下测定了sc-CO 2中聚全氟丙烯酸酯聚合物的浊点压力。
更新日期：2019-07-17
中文翻译：
通过绿色化学无溶剂合成超疏水表面
在“绿色化学”的范围内，通过使用使用液态CO 2的无溶剂表面涂覆方法，来制备具有拒水性和拒油性的超疏油性表面。在超临界CO 2介质中通过自由基聚合反应合成了聚（丙烯酸全氟烷基乙酯）均聚物。在室温下，在低CO 2下，在搅拌的不锈钢反应器中将该聚合物溶解在含有液态CO 2的亲水性纳米二氧化硅颗粒中压力。通过使用“自由弯月面涂覆”方法，使用聚合物/纳米二氧化硅分散体涂覆水平放置在不锈钢管中的载玻片。随着聚合物/纳米二氧化硅浓度，纳米二氧化硅粉末类型，系统压力和脱气流速的变化，在不同的涂层条件下形成了一系列超疏水涂层。在这些超两性杂化涂层中，最大的表观水接触角为173°，十六烷接触角为169°，滚落角小于7°。这样的超疏水表面在生物医学应用中具有很大的潜力，可以在分析过程中保存少量的生物液体。在平行研究中 通过应用“快速膨胀超临界溶液”方法，也可以获得不含任何纳米二氧化硅粉末的超疏水表面。将聚全氟丙烯酸酯聚合物溶解在超临界CO中如图2所示，将其喷涂到预先涂有聚丙烯酸酯粘合剂层的载玻片上。在该超疏水涂层上，水接触角大于170°。为了优化涂覆条件，为此目的，在各种聚合物浓度和温度下测定了sc-CO 2中聚全氟丙烯酸酯聚合物的浊点压力。
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