Strong Biomimetic Immobilization of Pt-Particle Catalyst on ABS Substrate Using Polydopamine and Its Application for Contact-Lens Cleaning with H2O2.

Yuji Ohkubo,Kazuya Yamamura,Daisuke Kaibara,Katsuyoshi Endo,Rie Sasaki,Satoshi Seino,Osamu Mori,Tomonori Aoki

doi:10.3390/nano10010114

Yuji Ohkubo, Kazuya Yamamura + Show 6 more

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https://doi.org/10.3390/nano10010114

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Abstract

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 H2O2 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 H2O2 concentration after immersing it in a 35,000-ppm H2O2 solution (the target value was less than 100 ppm). The catalytic durability was evaluated as the residual H2O2 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.

Highlights

Mussels can strongly adhere to several surfaces using their body fluid, regardless of whether the surfaces are dry or wet [1–3]
We introduced PDA coating as a pre-treatment for the strong immobilization of Pt-particle catalysts on acrylonitrile–butadiene–styrene copolymer (ABS) substrates and investigated the effect of the PDA coating on the deposition behavior
We introduced PDA coating as a pre-treatment for the strong immobilization of Pt-particle catalysts on ABS substrates and investigated the effect of the PDA coating on the deposition behavior of the Pt particles, the Pt-loading weight, and the catalytic activity and durability of the material

Summary

Introduction

Mussels can strongly adhere to several surfaces using their body fluid, regardless of whether the surfaces are dry or wet [1–3]. This phenomenon of adhesion to wet surfaces is unusual in the adhesives industry. Both DOPA and PDA have hydroxyl and amino groups and a benzene ring, so they can interact with various materials such as metal oxides, metals, and polymers, through van der Waals forces, and via hydrogen or coordinate bonding or π–π stack interaction. Since PDA has been reported as a novel adhesive coating for several materials such as Pt, Cu, TiO2 , SiO2 , and Al2 O3 [7], it has received even more attention. There are reports of PDA being utilized at sites for growing hydroxyapatite (HAp) [8]; PDA-coated polystyrene (PS)

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