Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, China.
School of Chemistry, The University of Melbourne, Parkville, VIC 3010, Australia.
Ultrason Sonochem. 2021 Jun;74:105571. doi: 10.1016/j.ultsonch.2021.105571. Epub 2021 Apr 21.
Polydopamine (PDA) coating of surfaces is a versatile strategy to fabricate functional films on various substrates, which typically requires oxygen and alkaline pH. Overcoming such limitations may enhance the versatility of this technique. Herein, we develop a simple and green sonochemical process for PDA coatings, which overcomes the limitations of traditional coating technique and expands the versatility of PDA chemistry. The oxidizing radicals generated by high frequency ultrasound (412 kHz) are utilized to initiate and accelerate the polymerization of dopamine. The sonochemical rate of film deposition is found to be about twice faster than that of the traditional method in the presence of oxygen. Importantly, the PDA coatings can be obtained in neutral or acidic aqueous solutions and even in the absence of oxygen. The PDA coatings can be moderated by turning on or off high frequency ultrasound. This study provides an environmentally friendly and economic method for the engineering of PDA coatings independent of the solution pH and nature of dissolved gas.
聚多巴胺（PDA）表面涂层是在各种基底上制备功能薄膜的通用策略，通常需要氧气和碱性 pH 值。克服这些限制可以提高该技术的通用性。在此，我们开发了一种简单且绿色的超声化学工艺来制备 PDA 涂层，该工艺克服了传统涂层技术的限制，并扩展了 PDA 化学的通用性。高频超声（412 kHz）产生的氧化自由基用于引发和加速多巴胺的聚合。在有氧存在的情况下，发现超声化学沉积的薄膜速率比传统方法快约两倍。重要的是，即使在中性或酸性水溶液中，甚至在没有氧气的情况下，也可以获得 PDA 涂层。通过打开或关闭高频超声可以调节 PDA 涂层。该研究提供了一种环保且经济的方法，可用于独立于溶液 pH 值和溶解气体性质来工程化 PDA 涂层。
