Material-Selective Polydopamine Coating in Dimethyl Sulfoxide

Abstract

Polydopamine coating is known to be performed in a material-independent manner and has become a popular tool when designing a surface-functionalization strategy of a given material. Studies to improve polydopamine coatings have been reported, aiming to reduce the coating time (by transition metals, oxidants, applied voltages, or microwave irradiation), control surface roughness using catechol derivatives, and vary the ad-layer molecules formed on an underlying polydopamine layer. However, none of the techniques have changed the most important intrinsic property of polydopamine, the surface-independent coating. Currently, no method has been reported to modify this property to create a material-selective 'smart' polydopamine coating. Herein, we report a method with polydopamine to differentiate the chemistry of surfaces. We found that the polydopamine coating was largely inhibited on silicon-containing surfaces such as Si wafers and quartz crystals in a dimethyl sulfoxide (DMSO)/phosphatebuffered saline (PBS) cosolvent, while the coating properties on other materials remained mostly unchanged. Among the various interface bonding mechanisms of coordination, namely, cation-π, π−π stacking, and hydrogen-bonding interactions, the DMSO/PBS cosolvent effectively inhibits hydrogen-bond formation between catechol and SiO 2 , resulting in surface-selective 'smart' polydopamine coatings. The new polydopamine coating is useful for functionalizing patterned surfaces such as Au patterns on SiO 2 substrates. Considering that Si wafer is the most widely used substrate, the surface-selective polydopamine coating technique described herein opens up a new direction in surface functionalization and interface chemistry.

Bio-Applications of Multifunctional Melanin Nanoparticles: From Nanomedicine to Nanocosmetics

“…This feature is surely advantageous since it allows a very general approach to surface functionalization. Nevertheless, as recently demonstrated by the same authors, material selectivity becomes preferable for the differential coating of a multi-material structure [93]. [35], with permission from American Chemical Society, 2020.…”

Development of Universal and Clickable Film by Mimicking Melanogenesis: On‐Demand Oxidation of Tyrosine‐Based Azido Derivative by Tyrosinase

“…The substrate-independent coating capability can be explained by the multiple adhesion (or interaction) possibilities of the oxidation mixtures (oxidized quinone, dopachrome, or DHI) with arbitrary substrates. In other words, the substrates can interact with heterogeneous products as follows: noble metals bind through 𝜋-𝜋 electron stacking; [41] polymeric (non-nucleophilic) substrates bind through hydrophobic, 𝜋-𝜋 stacking, or cation-𝜋 interactions; [42] ceramics bind through hydrogen bonds; [43] and metal oxides bind through coordination bonding. [44] In addition, the biocompatibility of poly(TBAD) films with adherent NIH 3T3 cells was investigated (see Supporting Information for the detailed experimental process).…”

Mussel-Inspired Magnetic Dissolving Pulp Fibers Toward the Adsorption and Degradation of Organic Dyes

“…Then, while stirring, an excessive ammonia solution (approximately 50 mL) was added and reacted for 1 h. The obtained reaction product was filtered and washed with a large amount of deionized water to remove any remaining ammonia and impurities before being freeze-dried. Afterward, a dopamine hydrochloride (0.25 mmol) solution dissolved in phosphate-buffered saline (pH 8.5, titrated with NaOH) was prepared ( Park et al, 2020 ). Subsequently, the prepared MDP fibers (0.5 g) were mixed into the dopamine solution in a 200-mL single-neck flask and reacted on an on-air table for 8 h.…”