Ulatowski Karol, Szczygielski Patryk, Sobieszuk Paweł
Department of Biotechnology and Bioprocess Engineering, Faculty of Chemical and Process Engineering, Warsaw University of Technology, Waryńskiego 1, 00-645 Warsaw, Poland.
Materials (Basel). 2024 Dec 10;17(24):6046. doi: 10.3390/ma17246046.
Cleaning of surfaces without complex cleaning agents is an important subject, especially in food, pharmaceutical, and biomedical applications. The subject of microbubble and nanobubble cleaning is considered one of the most promising ways to intensify this process. In this work, we check whether and how the purity of water used for microbubble generation, as well as the gas used, affects the effectiveness of cleaning stainless-steel surfaces. Surfaces contaminated with Pluronic L-121 solution were cleaned by water of three purities: ultrapure water (<0.05 μS/cm), water after reversed osmosis (6.0 μS/cm), and tap water (0.8 mS/cm). Similarly, three different gases were supplied to the generation setup for microbubble generation: air, oxygen, and nitrogen. Stainless steel plates were immersed in water during microbubble generation and cleaned for a given time. FTIR (Fourier Transform Infrared Spectroscopy) and contact angle analysis were employed for the analysis of surfaces. The results of cleaning were repeatable between plates and showed different cleaning effects depending on both the purity of water (concentration of ions) and gas composition. We have proposed different mechanisms that are dominant with respect to specific combinations of ion concentration and oxygen content in gas, which are directly connected to the microbubble stability and reactivity of gas.
不使用复杂清洁剂清洁表面是一个重要课题，尤其在食品、制药和生物医学应用领域。微泡和纳米泡清洁被认为是强化这一过程最具前景的方法之一。在这项工作中，我们研究了用于产生微泡的水的纯度以及所用气体是否以及如何影响不锈钢表面的清洁效果。用三种纯度的水清洁被普朗尼克L - 121溶液污染的表面：超纯水（<0.05 μS/cm）、反渗透后的水（6.0 μS/cm）和自来水（0.8 mS/cm）。同样，向微泡产生装置供应三种不同的气体用于产生微泡：空气、氧气和氮气。在产生微泡过程中将不锈钢板浸入水中并清洁给定时间。采用傅里叶变换红外光谱（FTIR）和接触角分析对表面进行分析。清洁结果在不同板材之间具有可重复性，并且根据水的纯度（离子浓度）和气体成分显示出不同的清洁效果。我们针对气体中离子浓度和氧气含量的特定组合提出了不同的主导机制，这些机制与微泡稳定性和气体反应性直接相关。
