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Size Regulation of Polydopamine Nanoparticles by Boronic Acid and Lewis Base,Macromolecular Rapid Communications
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Size regulation of polydopamine nanoparticles (PDA NPs) is vital to melanin-inspired materials. The general strategy usually focuses on tuning of the reaction parameters which could affect the dopamine (DA) monomer polymerization process, such as pH, temperature, monomer concentration, etc. The reaction between boronic acids and catechols to form boronic esters has been widely applied in many fields, but little attention has been paid in the size regulation of PDA NPs. Here, it is speculated that the fine size regulation of PDA NPs can be directly achieved by using boronic acids and Lewis base molecules. It is found that these issues could indeed significantly affect the stability of the boronic esters formed by boronic acids and DA, which may further inhibit the monomer polymerization kinetics and tune the particle size of the resulting PDA NPs. It is also found that the several intrinsic properties of PDA NPs such as the free radical scavenging ability, UV spectral absorption, photothermal behavior, and structural color all change with the particle size. It is believed that this work can provide new opportunities for fabricating melanin-inspired PDA NPs with well controlled size and properties.
中文翻译：
聚多巴胺纳米粒子 (PDA NPs) 的尺寸调节对于黑色素类材料至关重要。一般策略通常侧重于调整可能影响多巴胺 (DA) 单体聚合过程的反应参数，如 pH、温度、单体浓度等。硼酸与儿茶酚形成硼酸酯的反应已广泛应用于许多领域，但很少有人关注 PDA NPs 的尺寸调节。在这里，推测可以通过使用硼酸和路易斯碱分子直接实现 PDA NPs 的精细尺寸调节。发现这些问题确实会显着影响由硼酸和 DA 形成的硼酸酯的稳定性，这可能会进一步抑制单体聚合动力学并调整所得 PDA NP 的粒径。还发现 PDA NPs 的几个固有特性，如自由基清除能力、紫外光谱吸收、光热行为和结构颜色都随粒径而变化。相信这项工作可以为制造具有良好控制的尺寸和性能的黑色素启发的 PDA NPs 提供新的机会。 |
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