New insights in polydopamine formation via surface adsorption

Hemmatpour, Hamoon; Luca, Oreste De; Crestani, Dominic; Stuart, Marc C. A.; Lasorsa, Alessia; Wel, Patrick C.A. van der; Loos, Katja; Giousis, Theodosis; Haddadi‐Asl, Vahid; Rudolf, Petra

doi:10.1038/s41467-023-36303-8

Cited by 121 publications

(71 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is further confirmed by the analysis of N 1s high-resolution spectra of the films since the primary-amine part of the spectrum (N–C) is less significant for the DA/Cu 1:3 sample. A very recent study showed that primary amine contribution decreases with the oxidation time; thus, the decreased level indicates a higher oxidation level . Simultaneously, secondary amine abundance in the DA oxidation products indicates the elevated intramolecular cyclization rate. , Therefore, the effect of the Cu 2+ ions appears in both intermolecular and intramolecular interactions.…”

Section: Resultsmentioning

confidence: 98%

“…A very recent study showed that primary amine contribution decreases with the oxidation time; thus, the decreased level indicates a higher oxidation level. 55 Simultaneously, secondary amine abundance in the DA oxidation products indicates the elevated intramolecular cyclization rate. 56,57 Therefore, the effect of the Cu 2+ ions appears in both intermolecular and intramolecular interactions.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Control of Intermolecular Interactions toward the Production of Free-Standing Interfacial Polydopamine Films

Szewczyk

Babačić

Krysztofik

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Aggregation of the polydopamine (PDA) molecular building blocks at the air/water interface leads to obtaining large surface nanometric-thin films. This mechanism follows two possible pathways, namely, covalent or non-covalent self-assembly, which result in a different degree of structure order and, consequently, different structural properties. Control of this mechanism could be vital for applications that require true self-support PDA free-standing films, for example, electrochemical sensing or membrane technology. Here, we are considering the impact of boric acid (BA) and Cu2+ ions on the mentioned mechanism exclusively for the free-standing films from the air/water interface. We have employed and refined our own spectroscopic reflectometry method to achieve an exceptionally high real-time control over the thickness growth. It turned out that BA and Cu2+ ions significantly impact the film growth process. Reduction of the nanoparticles size and their number was examined via UV–vis spectroscopy and transmission electron microscopy, showing a colossal reduction in the mean diameter of nanoparticles in the case of BA and a moderate reduction in the case of Cu2+. This modification is leading to significant enhancement of the process efficiency through moderation of the topological properties of the films, as revealed by atomic force microscopy. Next, applying infrared, Raman, and X-ray photoelectron spectroscopy, we presented small amounts of metal (B or Cu) in the final structure of PDA and simultaneously their vital role in the oxidation mechanism and cross-linking through covalent or non-covalent bonds. Therefore, we revealed the possibility of synthesizing films via the expected self-assembly mechanism which has hitherto been out of control. Moreover, modification of mechanical properties toward exceptionally elastic films through the BA-assisted synthesis pathway was shown by achieving Young’s modulus value up to 24.1 ± 5.6 and 18.3 ± 6.4 GPa, using nanoindentation and Brillouin light scattering, respectively.

show abstract

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Control of Intermolecular Interactions toward the Production of Free-Standing Interfacial Polydopamine Films

Szewczyk

Babačić

Krysztofik

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Codeposition involves the blending of dopamine with another component to form a copolymer that is deposited on the surface of the substrate. The components can be synthetic polymers, biomolecules, small organic molecules, or nanomaterials. − Depending on the molecular structure of the component, it forms various interactions with dopamine. The component imparts new properties to the coating on the basis of its characteristics.…”

Section: Introductionmentioning

confidence: 99%

Effect of Codeposition of Polydopamine with Polyethylenimine or Poly(ethylene glycol) Coatings on Silver Nanoparticle Synthesis

2023

View full text Add to dashboard Cite

This study investigated the effects of polydopamine (PDA), PDA/polyethylenimine (PEI), and PDA/poly(ethylene glycol) (PEG) deposition on silver nanoparticle (AgNP) formation. PEI or PEG with different molecular weights was mixed with dopamine at different concentrations to obtain various PDA/PEI or PDA/PEG codepositions. These codepositions were soaked in silver nitrate solution to observe AgNPs generated on the surface and then to examine the catalytic activity of AgNPs for the reduction of 4-nitrophenol to 4-aminophenol. Results revealed that AgNPs on PDA/PEI or PDA/PEG codepositions were smaller and more dispersed than those on PDA coatings. Codeposition with 0.5 mg/mL polymer and 2 mg/mL dopamine generated the smallest AgNPs in each codeposition system. The content of AgNPs on PDA/PEI codeposition first increased and then decreased with an increase in the PEI concentration. PEI with a molecular weight of 600 (PEI600) generated a higher AgNP content than did PEI with a molecular weight of 10000. The AgNP content did not change with the concentration and molecular weight of PEG. Except for the codeposition with 0.5 mg/mL PEI600, codepositions produced less silver than did the PDA coating. The catalytic activity of AgNPs on all codepositions was better than that on PDA. The catalytic activity of AgNPs on all codepositions was related to the size of AgNPs. Smaller AgNPs exhibited more satisfactory catalytic activity. The codeposition with 0.5 mg/mL PEI600 had the highest rate constant (1.64 min–1). The systematic study provides insight into the relationship between various codepositions and AgNP generation and demonstrates that the composition of these codepositions can be tuned to increase their applicability.

show abstract

“…Although the dopamine monomer consists of catechol and ethylamine, catecholamine is not the only building block of PDA. Dopamine monomer possesses several reactive sites (amine, benzene, or hydroxy), which are electrophiles or nucleophiles, respectively, and thus are prone to create various building blocks such as catecholamine, 5,6-dihydroxy indole (DHI), and dopamine quinone during self-polymerization . Among these components, catecholamine plays a crucial role in adhesion, whereas DHI interferes with adherence. , Although DHI provides a cohesive behavior by promoting intermolecular π–π interaction, cation−π interactions through abundant π-electrons, as well as covalent crosslinking at its 2-position, an abundance of DHIs decreases the adhesion behavior of PDA .…”

Section: Introductionmentioning

confidence: 99%

Dihydroxy Indole-free Poly(catecholamine) for Smooth Surface Coating with Amine Functionality

Lim

Zhang

Wang

et al. 2023

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

The catecholamine of polydopamine (PDA) is associated with adhesion and self-polymerization. However, 5,6dihydroxyindole (DHI) of PDA inevitably consumes primary amine groups, which are helpful for the post-modification of PDAcoated surfaces. Furthermore, DHI leads to particle aggregation by causing π−π interaction and cation−π interaction. Here, we used 3,4-dihydroxybenzylamine hydrobromide to achieve DHI-free poly(catecholamine) (PCA) coating by self-polymerization. The DHI-free nature renders a smooth and uniform surface. Moreover, the suppressed indole ring formation preserves the primary amine groups after the DHI-free PCA coating, suggesting an alternative surface amine functionalization strategy to the conventional silanebased coating that is only applicable to hydroxyl-containing surfaces. Surface amine functionality of DHI-free poly(catecholamine) is confirmed by the fluorescence image of the tethered NHS ester-functionalized polydiacetylene liposome by the NHS ester-amine coupling reaction. Furthermore, DHI-free PCA was used to modify the surface properties of graphene to enhance the thermal conductivity of graphene-polymer composites. Graphene nanoplatelets (GnPs) coated with DHI-free PCA formed adequate intermolecular bonding with the poly(acrylic acid) matrix, which reduces interfacial thermal resistance. The resulting graphenepolymer composites achieved a sharp increase in thermal conductivity, reaching 2.9 W/mK at 15 wt % of graphene content, which is 87% larger than the thermal conductivity of control composites with untreated graphene.

show abstract

New insights in polydopamine formation via surface adsorption

Cited by 121 publications

References 46 publications

Control of Intermolecular Interactions toward the Production of Free-Standing Interfacial Polydopamine Films

Control of Intermolecular Interactions toward the Production of Free-Standing Interfacial Polydopamine Films

Effect of Codeposition of Polydopamine with Polyethylenimine or Poly(ethylene glycol) Coatings on Silver Nanoparticle Synthesis

Dihydroxy Indole-free Poly(catecholamine) for Smooth Surface Coating with Amine Functionality

Contact Info

Product

Resources

About