Electrochemically Driven, Electrode‐Addressable Formation of Functionalized Polydopamine Films for Neural Interfaces

Kang, Kyung‐Tae; Lee, Seokyoung; Kim, Rae-Young; Choi, Insung S.; Nam, Yoonkey

doi:10.1002/anie.201207129

Cited by 67 publications

(46 citation statements)

References 32 publications

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“…pDA coating of electrically conductive substrates can also be accomplished by electrochemical methods. pDA coating of metallic implants or gold-coated non-metallic substrates can be accomplished by cyclic voltammetry methods under neutral pH [35,36]. Unlike solution-based routes, the electrochemical deposition relies on the conductivity of the substrate and the coating is confined to the substrate surface.…”

Section: Accelerating the Coating Speed Of Pda Coatingsmentioning

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: Accelerating the Coating Speed Of Pda Coatingsmentioning

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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“…Both processes are not just time‐consuming, but also spatially and temporally uncontrollable, causing technical limitations in industrial applications and difficulty in programming the surface characteristics precisely . During the past decade, great efforts have been made to improve the efficiency and controllability of PDA coating method . Currently, by microwave assistance or adding specific oxidants, PDA coatings with improved uniformity and stability could be obtained in hours or even in 15 min, and spatiotemporal control of the coating process could be realized through UV light irradiation …”

Section: Introductionmentioning

confidence: 99%

UV‐Triggered Polydopamine Secondary Modification: Fast Deposition and Removal of Metal Nanoparticles

Zeng

Hou

et al. 2019

Adv Funct Materials

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Since the first report in 2007, polydopamine (PDA) coating has shown great potential as a general and versatile method to create functional nanocoatings on arbitrary substrates. Slow kinetics and poor controllability of the coating and secondary modification processes, however, have limited the further development of this attractive method. In this work, it is demonstrated that UV irradiation at 365 nm significantly accelerates the process of secondary modification of a PDA-coated surface. The kinetics of both thiol and amine modifications of PDA are increased 12-fold via UV irradiation, while the kinetics of metal ion reduction at the PDA interface is increased more than 550 times. Moreover, it is demonstrated that irradiating a PDA/metal nanoparticle composite surface with UV light at 254 nm leads to dissolution of the deposited metal nanoparticles (MNPs). Finally, grayscale metallic patterns, dynamic deposition, and removal of MNPs on PDA surface are realized with the proposed method.

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“…The volume change in the 35th cycle reduced to 18.4%, indicating that the actuation performance of the hydrogel was significantly declined. Such a gradual decrease in the amplitude of volume change might be because there was cross‐linking reaction occurring along with the electrooxidation process, similar to the reaction process of the electrochemical polymerization of polydopamine . The mechanical properties of the hydrogel were slightly more reproducible (Figure B).…”

Section: Resultsmentioning

confidence: 90%

Electrically Controllable Actuators Based on Supramolecular Peptide Hydrogels

Xue

Qin

Wang

et al. 2016

Adv Funct Materials

115

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Hydrogel actuators that can undergo structural change upon external stimuli are highly demanded due to their potential applications in diverse fields. However, the actuators based on physically cross‐linked supramolecular hydrogels are largely unexplored. This study reports the engineering of an electrically controllable supramolecular hydrogel as an actuator from a self‐assembling short peptide, in which a catechol moiety is introduced as the stimuli‐responsive motif. This kind of electrochemically responsive hydrogel is mechanically stable and can switch its physical properties dramatically upon the applied electric field. The mechanism and reversibility of the change are studied in detail. As a proof of principle, devices are designed to perform the unidirectional expansion and rotational motion under electrical stimulations. The applications of the actuators for controllable drug release and actuation of microfluidic devices are also illustrated. It is expected that these kind of supramolecular hydrogel actuators can find broad applications as novel biosensors, artificial robots, and smart soft materials.

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Electrochemically Driven, Electrode‐Addressable Formation of Functionalized Polydopamine Films for Neural Interfaces

Abstract: The electrode-specific formation of polydopamine films is achieved by applying positive voltage to the target electrodes at pH 6.0. The functionalization of the films is simultaneously carried out by co-depositing dopamine with molecules of interest onto the electrode.

Cited by 67 publications

References 32 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

UV‐Triggered Polydopamine Secondary Modification: Fast Deposition and Removal of Metal Nanoparticles

Electrically Controllable Actuators Based on Supramolecular Peptide Hydrogels

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