Abbas Mohsin, Buntinx Mieke, Deferme Wim, Reddy Naveen, Peeters Roos
IMO-IMOMEC, Packaging Technology Center, Hasselt University, Wetenschapspark 27, 3590 Diepenbeek, Belgium.
IMO-IMOMEC, Functional Materials Engineering, Hasselt University, Wetenschapspark 1, 3590 Diepenbeek, Belgium.
Nanomaterials (Basel). 2021 Feb 10;11(2):449. doi: 10.3390/nano11020449.
Ultrasonic spray-coating (USSC)-a wet chemical deposition method to deposit ultrathin (down to 20 nm) coatings-is being applied as a promising alternative deposition method for functional coatings due to an economical, simple, and precise coating process with easy control over its operating parameters. In this research, zinc oxide nanoparticles (ZnO NPs) were ultrasonically spray-coated on commercial-grade polyethylene terephthalate (PET) and poly(3-hydroxybutyrate--3-hydroxyhexanoate) (PHBHHx) films. The most suitable parameters for the ink composition, the ultrasonic spray-coating process, and the number of coating passes (up to 50×) were selected on the basis of a series of experiments. The oxygen gas barrier properties in terms of the oxygen transmission rate (OTR) of neat PET, and 3×, 5×, 10×, and 50× ZnO NP-coated PET and PHBHHx substrates were investigated. The OTR values for neat PET, and 3×, 5×, and 10× ZnO NP-coated PET substrates were found to be the same; however, a 5% reduction in OTR for 50× ZnO NP-coated PET substrate was observed compared to the neat PET substrate. No reduction in OTR was found for any above number of coating passes on PHBHHx substrates against the neat PHBHHx substrate. However, the ultraviolet (UV) tests of 3×, 5×, and 10× ZnO NP-coated PET and PHBHH× substrates revealed a significant decrease in percentage transmission for 10× coated PET and PHBHHx substrates as compared to their 3× and 5× ZnO NP-coated substrates, respectively. It was revealed from the study that the 50× ZnO NP coating of the PET substrate created a slight difference in OTR as compared to the reference substrate. However, the ultrasonic spray-coating method created a significant UV barrier effect for 3×, 5×, and 10× ZnO NP-coated PET and PHBHHx substrates, which demonstrates that the optimized coating method cannot be used to create a high oxygen barrier but can certainly be applied for UV barrier applications in food packaging. It is concluded that ultrasonic spray deposition of ZnO NPs on PET and PHBHHx materials has shown promising results for UV barrier properties, demonstrating the advantages of using this method compared to other coating methods with regard to cost-effectiveness, precise coating, and better process control.
超声喷涂（USSC）——一种用于沉积超薄（低至20纳米）涂层的湿化学沉积方法——正作为一种有前景的功能性涂层替代沉积方法被应用，因为其涂层工艺经济、简单且精确，操作参数易于控制。在本研究中，氧化锌纳米颗粒（ZnO NPs）被超声喷涂在商业级聚对苯二甲酸乙二酯（PET）和聚（3-羟基丁酸酯-3-羟基己酸酯）（PHBHHx）薄膜上。基于一系列实验，选择了油墨成分、超声喷涂工艺以及涂层遍数（最多50遍）的最合适参数。研究了纯PET以及3遍、5遍、10遍和50遍ZnO NP涂层的PET和PHBHHx基材在氧气透过率（OTR）方面的氧气阻隔性能。发现纯PET以及3遍、5遍和10遍ZnO NP涂层的PET基材的OTR值相同；然而，与纯PET基材相比，50遍ZnO NP涂层的PET基材的OTR降低了5%。对于PHBHHx基材，上述任何涂层遍数的OTR与纯PHBHHx基材相比均未降低。然而，3遍、5遍和10遍ZnO NP涂层的PET和PHBHHx基材的紫外线（UV）测试显示，与3遍和5遍ZnO NP涂层的基材相比，10遍涂层的PET和PHBHHx基材的透过率百分比显著降低。研究表明，与参考基材相比，PET基材的50遍ZnO NP涂层在OTR方面产生了轻微差异。然而，超声喷涂方法对3遍、5遍和10遍ZnO NP涂层的PET和PHBHHx基材产生了显著的紫外线阻隔效果，这表明优化后的涂层方法不能用于制造高氧气阻隔，但肯定可应用于食品包装中的紫外线阻隔应用。得出的结论是，在PET和PHBHHx材料上超声喷涂ZnO NPs在紫外线阻隔性能方面显示出了有前景的结果，证明了与其他涂层方法相比，该方法在成本效益、精确涂层和更好的工艺控制方面的优势。
Zotero 插件
