Facile pH-Dependent Synthesis and Characterization of Catechol Stabilized Silver Nanoparticles for Catalytic Reduction of 4-Nitrophenol

Gebru, Hailemariam; Cui, Saide; Li, Zhenjiang; Wang, Xin; Pan, Xianfu; Liu, Jingjing; Guo, Kai

doi:10.1007/s10562-017-2100-y

Cited by 21 publications

(7 citation statements)

References 55 publications

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“…Gebru et al synthesized AgNPs with different particle sizes, including 13, 38, and 47 nm, and observed that the conversion rate of these samples for the reduction of 4-NP to 4-AP was 61%, 33%, and 17%, respectively. 37 Kalyan et al prepared two sizes of AuNPs immobilized on silica with average diameters of 55 and 72 nm. The first-order rate constants of two AuNPs for the reduction of 4-NP were 0.0667 and 0.0257 min −1 .…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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

2023

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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.

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Section: ■ Results and Discussionmentioning

confidence: 99%

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

2023

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“…However, a mixture solution of dopamine and AgNO 3 has a strong absorption at 450 nm, indicating that the Ag + in the solution was reduced to Ag 0 and formed AgNPs. 37 Semiquantitative results of the surface chemical elemental on different surfaces are shown in Table 1. As each step of the reaction proceeded, the titanium content continued to decline, illustrating that the titanium substrate was gradually covered.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Neither dopamine nor AgNO 3 solution presents an absorbance peak position. However, a mixture solution of dopamine and AgNO 3 has a strong absorption at 450 nm, indicating that the Ag + in the solution was reduced to Ag 0 and formed AgNPs …”

Section: Results and Discussionmentioning

confidence: 99%

Poly-l-lysine/Sodium Alginate Coating Loading Nanosilver for Improving the Antibacterial Effect and Inducing Mineralization of Dental Implants

et al. 2020

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In recent years, antibacterial surface modification of titanium (Ti) implants has been widely studied in preventing implant-associated infection for dental and orthopedic applications. The purpose of this study was to prepare a composite coating on a porous titanium surface for infection prevention and inducing mineralization, which was initialized by deposition of a poly- l -lysine (PLL)/sodium alginate(SA)/PLL self-assembled coating, followed by dopamine deposition, and finally in situ reduction of silver nanoparticles (AgNPs) by dopamine. The surface zeta potential, SEM, XPS, UV–vis, and water contact angle analyses demonstrate that each coating was successfully prepared after the respective steps and that the average sizes of AgNPs were 20–30 nm. The composite coating maintained Ag+ release for more than 27 days in PBS and induced mineralization when incubated in SBF. The antibacterial results showed that the composite coating inhibited/killed bacteria on the material surface and killed bacteria around them. In addition, although this coating inhibited the initial adhesion of osteoblasts, the mineralized surface greatly enhanced the cytocompatibility. Thus, we concluded that the composite coating could prevent bacterial infections and facilitate mineralization in vivo in the early postoperative period, and then, the mineralized surface could enhance the cytocompatibility.

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“…Molecular mechanisms to explain polydopamine coating have not been fully elucidated but have been addressed step-by-step. The adhesion strength of a catechol to various substrates has been experimentally measured using atomic force microscopy (AFM) and a surface force apparatus (SFA). − On metal oxide materials such as TiO 2 , Fe 2 O 3 , ZnO 2 , and others, the catechol in polydopamine forms a coordination bond, with one example shown by the reversible yet robust bonding at the single-molecule level (∼800 pN) demonstrating catechol complexation with metal oxide surfaces. , In the case of molecular adhesion of an oxidized catechol (i.e., quinone) to an organic surface comprising amine groups, a covalent bond is formed via interfacial reactions such as Michael addition and Schiff-base formation. , Noble metals such as silver and gold as well as carbon (nano)materials are thought to mainly bind by π–π electron stacking. − For synthetic polymers such as polystyrene and poly(methyl methacrylate), which do not possess reactive nucleophiles, various mechanisms of coexisting hydrophobic, cation-π, and π–π stacking interactions have been proposed to be driving forces for the coatings . Lastly, for ceramic materials such as silica, glass, mica, and others, hydrogen bonds are known to be the dominant force in polydopamine coatings .…”

Section: Introductionmentioning

confidence: 99%

Material-Selective Polydopamine Coating in Dimethyl Sulfoxide

Park

Lee

et al. 2020

ACS Appl. Mater. Interfaces

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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.

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Facile pH-Dependent Synthesis and Characterization of Catechol Stabilized Silver Nanoparticles for Catalytic Reduction of 4-Nitrophenol

Cited by 21 publications

References 55 publications

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

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

Poly-l-lysine/Sodium Alginate Coating Loading Nanosilver for Improving the Antibacterial Effect and Inducing Mineralization of Dental Implants

Material-Selective Polydopamine Coating in Dimethyl Sulfoxide

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