Amine‐Triggered Dopamine Polymerization: From Aqueous Solution to Organic Solvents

Liu, Xinghuan; Kang, Junjie; Wang, Yiqing; Li, Wei; Guo, Heling; Xu, Liang; Guo, Xuhong; Zhou, Feng; Jia, Xin

doi:10.1002/marc.201800160

Cited by 23 publications

(14 citation statements)

References 41 publications

(51 reference statements)

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“…The authors demonstrated the utility of this approach in establishing pDA coating of water-labile electrospun nanofibers, controlled release of hydrophobic drug, paclitaxel and immobilization of organothiols. Liu et al reported the pDA coating in ethanol and in the presence of large excess of tetramethylethylenediamine (TEMED) [42]. Despite the large excess of (TEMED: dopamine = 26), a maximum coating thickness of 28 nm was achieved in 48 h. When compared to other organic bases, piperidine showed higher coating thickness and coating speed and attributed to the strong basic properties (low pKb) and higher nucleophilicity of piperidine.…”

Section: Pda Nanocoatings In Organic Solventsmentioning

confidence: 99%

Oxidative Polymerization of Dopamine: A High-Definition Multifunctional Coatings for Electrospun Nanofibers - An Overview

Lakshminarayanan¹,

Srinivasan²,

Sim³

2018

Dopamine - Health and Disease

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The invention that catecholamines undergo oxidative polymerization under alkaline conditions and form adhesive nanocoatings on wide variety of substrates has ushered their potential utility in engineering and biomedical applications. The oxidative polymerization of catecholamines can be triggered by light, chemical and physical methods, thus representing one of the widely explored surface coating methods. The overall objectives of this chapter are to compile the various methods of accomplishing surface coatings and compare the structural diversity of catecholamines. The progress achieved so far on polydopamine (pDA) coatings on electrospun polymers will be discussed. Finally, we will summarize the research efforts on catecholamine coatings for biomedical applications as well as their potential as a high definition coating method.

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Section: Pda Nanocoatings In Organic Solventsmentioning

confidence: 99%

Oxidative Polymerization of Dopamine: A High-Definition Multifunctional Coatings for Electrospun Nanofibers - An Overview

Lakshminarayanan¹,

Srinivasan²,

Sim³

2018

Dopamine - Health and Disease

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“…In particular, the TEM image of ECo-900 (Figure S2a) shows aggregated particles while DA-900 (Figure S2b) shows a thin-sheet-like morphology. According to previous research, the polymerization of DA takes place easily in mildly alkaline aqueous media, , and amines can trigger polymerization by capturing H + from dopamine hydrochloride and intermediates to accelerate the generation of radical species in water. , For this reason, ammonia plays an important role in regulating spherical morphology. All the shapes of Blank, E@D, and ECo@D catalysts are spherical except for the difference in diameter (Figure a–c).…”

Section: Resultsmentioning

confidence: 99%

Enhancing Defects of N-Doped Carbon Nanospheres Via Ultralow Co Atom Loading Engineering for a High-Efficiency Oxygen Reduction Reaction

Zhang

Chen

et al. 2021

ACS Appl. Energy Mater.

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It is vital to explore sustainable and highly efficient catalysts for the oxygen reduction reaction (ORR) with increasing energy demand. Herein, a cobalt (Co) atom dispersed on an N-doped carbon nanosphere catalyst (denoted as ECo@D) was designed and constructed by a simple precursor-engineering method. The regulation of heteroatoms and Co metal atoms in precursors introduces more defects and thus reduces the degree of graphitization in the catalyst. The high N content of 5.23 at% in the ECo@D catalyst provides abundant N sites to anchor metallic Co atoms, which further increases the defects for enhanced catalytic activity. The obtained ECo@D with an ultralow loading of Co (only 0.041 wt %) exhibits an onset potential of 1.05 V, a limited-diffusion current density of 4.74 mA/cm2, and a half-wave potential of 0.79 V for the ORR under alkaline conditions, comparable to those of commercial Pt/C (1.06 V, 4.58 mA/cm2, and 0.81 V, respectively). Therefore, the synergistic effect of heteroatoms and Co metal atoms is beneficial for tuning the carbon matrix defects, which leads to the improvement of ORR activity. The Koutecky–Levich equation and rotating ring-disk electrode tests reveal a complete four-electron oxygen reduction pathway, impeding hydrogen peroxide generation. Moreover, nearly 93.8% of the current is retained for ECo@D after 10 h stability testing without any morphological structural collapse. Meanwhile, it demonstrates superior tolerance to methanol. Our discovery opens a door to engineering the defects of carbon catalysts through introducing ultralow loading of non-noble metal atoms on substrates.

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“…For instance, by abstracting a hydrogen atom from the dopamine monomer promotes the generation of DA radical species. [49,50] PDA deposition can also be achieved in acidic conditions either in the absence of oxygen [48] or in the presence of oxidants. [9,51] Here, the polymerization route was suggested to proceed via the formation of dopamine-semiquinone radical [11] and free radical polymerization mechanism.…”

Section: Polymerization Mechanismmentioning

confidence: 99%

High‐Precision Micropatterning of Polydopamine by Multiphoton Lithography

et al. 2022

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Mussel‐inspired polydopamine (PDA) initiates a multifunctional modification route that leads to the generation of novel advanced materials and their applications. However, existing PDA deposition techniques still exhibit poor spatial control, have a very limited capability of micropatterning, and do not allow local tuning of the PDA topography. Herein, PDA deposition based on multiphoton lithography (MPL) is demonstrated, which enables full spatial and temporal control with nearly total freedom of patterning design. Using MPL, 2D microstructures of complex design are achieved with pattern precision of 0.8 µm without the need of a photomask or stamp. Moreover, this approach permits adjusting the morphology and thickness of the fabricated microstructure within one deposition step, resulting in a unique tunability of material properties. The chemical composition of PDA is confirmed and its ability for protein enzyme immobilization is demonstrated. This work presents a new methodology for high‐precision and complete control of PDA deposition, enabling PDA incorporation in applications where fine and precise local surface functionalization is required. Possible applications include multicomponent functional elements and devices in microfluidics or lab‐on‐a‐chip systems.

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Amine‐Triggered Dopamine Polymerization: From Aqueous Solution to Organic Solvents

Cited by 23 publications

References 41 publications

Oxidative Polymerization of Dopamine: A High-Definition Multifunctional Coatings for Electrospun Nanofibers - An Overview

Oxidative Polymerization of Dopamine: A High-Definition Multifunctional Coatings for Electrospun Nanofibers - An Overview

Enhancing Defects of N-Doped Carbon Nanospheres Via Ultralow Co Atom Loading Engineering for a High-Efficiency Oxygen Reduction Reaction

High‐Precision Micropatterning of Polydopamine by Multiphoton Lithography

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