A colorless functional polydopamine thin layer as a basis for polymer capsules

Kohri, Michinari; Kohma, Hiroto; Shinoda, Yoshihiro; Yamauchi, Mitsuaki; Yagai, Shiki; Kojima, Takashi; Taniguchi, Tadatsugu; Kishikawa, Keiki

doi:10.1039/c3py00181d

Cited by 92 publications

(88 citation statements)

References 52 publications

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“…Bisher sind nur wenige materialunabhängige farblose, transparente Beschichtungen (wie Polyphenole und eine Mischung aus 2-Bromisobutyryl-substituiertem Dopamin und Dopamin) bekannt. [29,30] Der Durchlässigkeitsgrad der koordinativ vernetzten Beschichtungen erreichte nach zwçlf Stunden Beschichtungszeit etwa 97 %. Demgegenüber verringerte sich die optische Transparenz der kovalenten Beschichtung bereits binnen fünf Minuten auf 90 % und innerhalb von zehn Minuten auf 68 %.…”

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Muschel‐inspirierte dendritische Polymere als universelle multifunktionale Beschichtungen

et al. 2014

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Muschel‐inspirierte dendritische Polymere als universelle multifunktionale Beschichtungen

et al. 2014

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“…The PS core is not crosslinked and therefore the linear PS chains dissolved in THF can diffuse out of the PDA shell, as conrmed by many previous works. 6,23,24,40,49 TEM and SEM of the PDA coated particles and the ones aer removing PS are listed in Fig. 1.…”

Section: Preparation Of Pda Capsules With An Ellipsoidal Shapementioning

confidence: 99%

“…However, many capsules will buckle, collapse or even break when being subjected to drying, high vacuum as in the case of electronic microscope or experiencing external forces such as exerted by the cantilever of AFM. 4,6,7,9,10,[22][23][24][25] Furthermore, polymeric capsules oen need to be processed into other materials in the dried state and under high temperature and pressure. 15,26,27 Keeping the intactness of their precious capsule-like shape is demanding during such stringent processes since the loss of the shape unavoidably devalues the advantages brought by the hollow cavity, and high specic surface area.…”

Section: 17mentioning

confidence: 99%

Anisotropic polydopamine capsules with an ellipsoidal shape that can tolerate harsh conditions: efficient adsorbents for organic dyes and precursors for ellipsoidal hollow carbon particles

Zhang

et al. 2017

RSC Adv.

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Polymeric capsules often buckle, collapse or even break when being processed in the dried state into other materials under high temperature and pressure due to moderate mechanical rigidity. In the case of nonspherical capsules, to keep their precious anisotropic morphology intact under harsh conditions is even more challenging since the whole surface of such kinds of capsules does not experience the same stress or strain due to the different surface curvatures. In the current work, we reported a strategy to prepare polydopamine (PDA) capsules with an ellipsoidal shape and enhanced mechanical rigidity using polystyrene ellipsoids as the sacrificial anisotropic templates. Bio-inspired oxidation induced selfpolymerization of dopamine can form conformal PDA coatings on polystyrene ellipsoids of various aspect ratios and sizes. Several strategies have been exploited to increase the thickness of the PDA shell, among which, iterating PDA coating produces ellipsoidal PDA capsules with a thick and robust shell.These ellipsoidal PDA capsules can survive carbonization at temperatures as high as 800 C and were directly turned into N-doped carbon capsules with a well-defined ellipsoidal shape, excluding the necessity of removing the sacrificial templates after carbonation. Furthermore, the rigid PDA ellipsoidal capsules are efficient adsorbents for organic dyes in contaminated water and have impressive adsorption efficiencies as high as 200 mg g À1.

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“…This phenomenon is probably due to the thin thickness of the PDA/BiBB 2 layer thickness. The thicknesses of PDA/BiBB 2 on glass plate [17] and PSt particles [18], measured by atomic force microscopy (AFM) and SEM, were determined to be ca. 6 nm and 7 nm, respectively, indicating thin thickness of PDA/BiBB 2 layer.…”

Section: Two-step Hierarchically Structured Coatingsmentioning

confidence: 99%

“…To overcome this drawback, we recently demonstrated the preparation of a colorless PDA layer containing ATRP initiator prepared by the in situ reaction of DA with 2-bromoisobutyryl bromide (BiBB); The synthesized colorless PDA layer is designated PDA/BiBB 2 ([BiBB]/ [DA] = 2, the ratio uses the molar concentrations of DA and BiBB) [17]. PDA/BiBB 2 layer was placed onto PSt particles, and then the surface of obtained particles was coated with polymer brush layers via SI-ATRP [18]. It would be great interest to explore the feasibility of using PDA/BiBB 2 layer to various types of material surfaces instead of PSt particles.…”

Section: Introductionmentioning

confidence: 99%

Hierarchically Structured Coatings by Colorless Polydopamine Thin Layer and Polymer Brush Layer

Kohma

Uradokoro

Kohri

et al. 2014

Trans. Mat. Res. Soc. Japan

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Herein, we describe a general and versatile procedure to fabricate hierarchically structured coatings onto material surfaces using colorless polydopamine (PDA) thin layer and polymer brush layer. Firstly, atom transfer radical polymerization (ATRP) initiator-containing colorless PDA layer was coated onto various types of material surfaces. Then, surface-initiated ATRP was conducted to produce functional polymer brush layer. This methodology will be applied to a broad range of materials to modification of surface properties. Furthermore, one-step hierarchically structured coatings of materials surface were also investigated.

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A colorless functional polydopamine thin layer as a basis for polymer capsules

Cited by 92 publications

References 52 publications

Muschel‐inspirierte dendritische Polymere als universelle multifunktionale Beschichtungen

Muschel‐inspirierte dendritische Polymere als universelle multifunktionale Beschichtungen

Anisotropic polydopamine capsules with an ellipsoidal shape that can tolerate harsh conditions: efficient adsorbents for organic dyes and precursors for ellipsoidal hollow carbon particles

Hierarchically Structured Coatings by Colorless Polydopamine Thin Layer and Polymer Brush Layer

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