Hairy Polydopamine Particles as Platforms for Photonic and Magnetic Materials

Kohri, Michinari; Uradokoro, Kanako; Nannichi, Yuri; Kawamura, Ayaka; Taniguchi, Tadatsugu; Kishikawa, Keiki

doi:10.3390/photonics5040036

Cited by 17 publications

(14 citation statements)

References 36 publications

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“…[ 106 ] In addition, some polymer‐coated melanin nanoparticles have been used to produce structural colors, for example, hairy particles made from polyHEMA brushes grafted on the polydopamine nanoparticles. [ 107 ]…”

Section: Bioinspired Optics‐related Applicationsmentioning

confidence: 99%

Bioinspired Melanin‐Based Optically Active Materials

Xiao

Shawkey

Dhinojwala

2020

Advanced Optical Materials

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the properties and functions of melanin, the synthesis of melanin-like nanoparticles, and its versatile applications in catalysis, energy, and biomedical fields. Over the last 5 years, more than 1000 papers on melanin have been published annually, based on data from the Web of Science. Quite a few of these papers have reviewed melanin's chemical structure, physiochemical properties, and biomedical applications. [4-6] However, a critical review focusing on optical functions of melanin is still lacking, despite tremendous emerging work on melaninbased photonic materials. The purpose of this review is to summarize current advances in bioinspired melanin-based optically active materials. Specifically, we will cover inherent optical properties of melanin, and then summarize melanin's optical functions in nature and its optics-related applications. 2. Melanin Structure and Optical Properties Melanin has complex chemical structures that is not yet fully understood, however, it does not hinder the exploration of their optical properties. In this section, we will first discuss classifications of melanin and then summarize unique optical properties of melanin, which will be important for both understanding its biological function in nature and synthetic applications. 2.1. Classification and Structure Conventionally, all black pigments are called melanin. Recently, d'Ischia et al. suggested that any phenolic polymers that have broadband light absorption, antioxidant, and intrinsic free radical character should be characterized as melanin. [5] Exact chemical structures of melanin remain elusive, mainly due to their insolubility in solvents, close binding with other cellular tissues, and an amorphous structure. Here, we do not elaborate on the complexities of melanin's chemical structures, [7] but rather focus on its classification. Melanin can be categorized as either natural or synthetic depending on whether it was synthesized in vivo or in vitro. Both have similar macroscopic properties, but their structures are likely quite different. Natural melanin, including eumelanin, pheomelanin, and neuromelanin, is produced from a series of enzymatic reactions starting from L-tyrosine in biological systems (Figure 1). [1] In cells (commonly melanocytes), the tyrosinase oxidizes L-tyrosine to dopaquinone (DQ). If cysteine concentration in Melanin is a widespread multifunctional biological pigment that has emerged as a promising platform for applications in coating, catalysis, energy, drug delivery, and medical therapy. Melanin is also a compelling material for photonic applications because of its favorable material characteristics, including broadband absorption, high refractive index, tunable fluorescence, and UV blocking capabilities. However, there is not yet a critical review focusing on optical functions of melanin. This review summarizes current advances in bioinspired melanin-based optically active materials, covering melanin's inherent optical properties and functions both in nature and in optics-related applications. It is ...

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Section: Bioinspired Optics‐related Applicationsmentioning

confidence: 99%

Bioinspired Melanin‐Based Optically Active Materials

Xiao

Shawkey

Dhinojwala

2020

Advanced Optical Materials

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“…Very recently, the diameter of PDA based nanoparticles and the structural color of PDA based photonic crystals has been modified by grafting poly(hydroxyethyl methacrylate) chains on PDA nanoparticles covered with an atom transfer radical polymerization (ATRP) initiator. Those PDA nanoparticles have been produced in a two step process first starting from dopamine in the presence of Tris buffer at pH = 8.5 (dissolved O 2 being the oxidant) and following by the addition of 2bromoisobutyryl bromide (BiBB) modified dopamine, to produce core shell nanoparticles around 220 nm in diameter, where the shell is made from BiBB-PDA acting as the ATRP initiator [79]. All this research relies on the fact that PDA is closely related to eumelanin which is the material used to produce the structural colors of the male peacocks' feathers [80].…”

Section: Applications Of Polydopamine Based Nanomaterialsmentioning

confidence: 99%

Polydopamine as a stable and functional nanomaterial

Yakhlifi

Ball

2020

Colloids and Surfaces B: Biointerfaces

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The mussel inspired chemistry of dopamine leading to versatile coatings on the surface of all kinds of materials in a one pot process was considered as the unique aspect of catecholamine for a long time. Only recently, research has been undertaken to valorize the simultaneous oxidation and colloid formation in dopamine solutions in the presence of an oxidant. This mini review summarizes the synthesis methods allowing to get controlled nanomaterials, either nanoparticles, hollow capsules or nanotubes and even chiral nanomaterials from dopamine solutions. Finally the applications of those nanomaterials will be described.

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“…In addition, the color tone could be changed by attaching hairy polymer chains to the surface of PDA particles. When PDA particles grafted with a hydrophilic hair polymer were assembled, the tone of the structural color was controlled by the change in interparticle distance [ 61 ]. Since PDA particles were well dispersed in water [ 62 ], structural coloration by spray painting was also possible ( Figure 4(c) ) [ 60 ].…”

Section: Polydopamine Particle-based Structural Colorationmentioning

confidence: 99%

Progress in polydopamine-based melanin mimetic materials for structural color generation

Kohri

2020

Science and Technology of Advanced Materials

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Structural color is a color derived from optical interaction between light and a microstructure and is often seen in nature. Natural melanin plays an important role in bright structural coloration. For example, the vivid colors of peacock feathers are due to structural colors. The periodic arrangement of melanin granules inside the feathers leads to light interference, and the black granules absorb scattered light well, resulting in bright structural color. In recent years, polydopamine (PDA) has attracted attention as a melanin mimetic material. This review article summarizes recent research on structural coloration using PDAbased artificial melanin materials. It also outlines possible applications using bright structural colors realized by artificial melanin materials and future perspectives.

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Hairy Polydopamine Particles as Platforms for Photonic and Magnetic Materials

Cited by 17 publications

References 36 publications

Bioinspired Melanin‐Based Optically Active Materials

Bioinspired Melanin‐Based Optically Active Materials

Polydopamine as a stable and functional nanomaterial

Progress in polydopamine-based melanin mimetic materials for structural color generation

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