Ohkubo Yuji, Aoki Tomonori, Kaibara Daisuke, Seino Satoshi, Mori Osamu, Sasaki Rie, Endo Katsuyoshi, Yamamura Kazuya
Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan.
Menicon Co., Ltd., Kasugai, Aichi 487-0032, Japan.
Nanomaterials (Basel). 2020 Jan 7;10(1):114. doi: 10.3390/nano10010114.
Polydopamine (PDA)-a known adhesive coating material-was used herein to strongly immobilize a Pt-particle catalyst on an acrylonitrile-butadiene-styrene copolymer (ABS) substrate. Previous studies have shown that the poor adhesion between Pt particles and ABS surfaces is a considerable problem, leading to low catalytic durability for HO decomposition during contact-lens cleaning. First, the ABS substrate was coated with PDA, and the PDA film was evaluated by X-ray photoelectron spectroscopy. Second, Pt particles were immobilized on the PDA-coated ABS substrate (ABS-PDA) using the electron-beam irradiation reduction method. The Pt particles immobilized on ABS-PDA (Pt/ABS-PDA) were observed using a scanning electron microscope. The Pt-loading weight was measured by inductively coupled plasma atomic emission spectroscopy. Third, the catalytic activity of the Pt/ABS-PDA was evaluated as the residual HO concentration after immersing it in a 35,000-ppm HO solution (the target value was less than 100 ppm). The catalytic durability was evaluated as the residual HO concentration after repeated use. The PDA coating drastically improved both the catalytic activity and durability because of the high Pt-loading weight and strong adhesion among Pt particles, PDA, and the ABS substrate. Plasma treatment prior to PDA coating further improved the catalytic durability.
聚多巴胺（PDA）——一种已知的粘合剂涂层材料——在本文中用于将铂颗粒催化剂牢固地固定在丙烯腈-丁二烯-苯乙烯共聚物（ABS）基材上。先前的研究表明，铂颗粒与ABS表面之间的附着力差是一个相当严重的问题，导致在隐形眼镜清洁过程中过氧化氢分解的催化耐久性较低。首先，在ABS基材上涂覆PDA，并通过X射线光电子能谱对PDA膜进行评估。其次，使用电子束辐照还原法将铂颗粒固定在涂覆有PDA的ABS基材（ABS-PDA）上。使用扫描电子显微镜观察固定在ABS-PDA上的铂颗粒（Pt/ABS-PDA）。通过电感耦合等离子体原子发射光谱法测量铂负载量。第三，将Pt/ABS-PDA浸入35000 ppm的过氧化氢溶液后，以剩余过氧化氢浓度评估其催化活性（目标值小于100 ppm）。将重复使用后的剩余过氧化氢浓度评估为催化耐久性。由于铂负载量高以及铂颗粒、PDA和ABS基材之间的强附着力，PDA涂层极大地提高了催化活性和耐久性。在PDA涂层之前进行等离子体处理进一步提高了催化耐久性。
