Triblock copolymer-mediated synthesis of catalytically active gold nanostructures

Santos, Douglas C.; Souza, Viviane Costa de; Vasconcelos, Diego Andrade; Andrade, George Ricardo Santana; Gimenez, Iara F.; Teixeira, Zaine

doi:10.1007/s11051-018-4212-8

Cited by 2 publications

(5 citation statements)

References 38 publications

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“…In addition, the experiment also used the sample AuNP-PLU:0.5, which was prepared under ambient light with the smallest PLU concentration, but sufficient to produce sizeable amounts of AuNPs. As shown in Figure 2A, the voltammogram (green curve) of the plain HAuCl4 solution clearly shows the Au 0 /Au 3+ redox pair at +1.0 V and +0.56 V, respectively, plus the cathodic wave for Au 1+ /Au 0 at -0.2 V. The voltammogram of plain PLU shows a subtle anodic event at +0.11 V. Indeed, this is sufficient to reduce Au 3+ to Au 0 , which occurs at a much higher potential, as discussed in a previous contribution [32]. On the other hand, these electrochemical signals almost disappear in the voltammograms of the nanocomposites as a result of the Au 3+ reduction.…”

Section: Evaluation Of the Yield Of Aunp-plu-uv Productionsupporting

confidence: 66%

“…Otherwise, for the reaction carried out under ambient light, the formation of AuNPs is visually detected solely after 60 min (as observed in ref. [32], where the LSPR band is centered at 536 nm), thus indicating that UV irradiation accelerates the reaction and the LSPR band of AuNP-PLU:2.0UV is blue-shifted in comparison to the sample AuNP-PLU:2.0. Indeed, Supplementary Figure S2 displays isotherms for the formation of AuNP-PLU under ambient light (AuNP-PLU:2.0) (data from ref.…”

Section: Kinetics Of Uv-assisted Synthesis Of Aunp-plumentioning

confidence: 94%

“…Indeed, Supplementary Figure S2 displays isotherms for the formation of AuNP-PLU under ambient light (AuNP-PLU:2.0) (data from ref. [32]) and UV irradiation (AuNP-PLU:2.0UV). Although both isotherms show an asymptotic behavior, it is noted that the reaction is much faster in the presence of UV irradiation, which reaches equilibrium in about 10 min, in contrast to the reaction carried out under ambient light, which reaches equilibrium in about 60 min.…”

Section: Kinetics Of Uv-assisted Synthesis Of Aunp-plumentioning

confidence: 99%

“…In parallel, cyclic voltammetry indicated that complete reduction of Au 3+ occurs only above the critical micellar concentration (cmc) (~0.2-0.8 wt%) of F127 [31]. Another study suggested that the size and polydispersity of these AuNPs depend almost exclusively on the copolymer concentration [32].…”

Section: Introductionmentioning

confidence: 97%

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UV-Accelerated Synthesis of Gold Nanoparticle–Pluronic Nanocomposites for X-ray Computed Tomography Contrast Enhancement

et al. 2023

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Eco-friendly chemical methods using FDA-approved Pluronic F127 (PLU) block copolymer have garnered much attention for simultaneously forming and stabilizing Au nanoparticles (AuNPs). Given the remarkable properties of AuNPs for usage in various fields, especially in biomedicine, we performed a systematic study to synthesize AuNP-PLU nanocomposites under optimized conditions using UV irradiation for accelerating the reaction. The use of UV irradiation at 254 nm resulted in several advantages over the control method conducted under ambient light (control). The AuNP-PLU-UV nanocomposite was produced six times faster, lasting 10 min, and exhibited lower size dispersion than the control. A set of experimental techniques was applied to determine the structure and morphology of the produced nanocomposites as affected by the UV irradiation. The MTT assay was conducted to estimate IC50 values of AuNP-PLU-UV in NIH 3T3 mouse embryonic fibroblasts, and the results suggest that the sample is more compatible with cells than control samples. Afterward, in vivo maternal and fetal toxicity assays were performed in rats to evaluate the effect of AuNP-PLU-UV formulation during pregnancy. Under the tested conditions, the treatment was found to be safe for the mother and fetus. As a proof of concept or application, the synthesized Au:PLU were tested as contrast agents with an X-ray computed tomography scan (X-ray CT).

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Section: Evaluation Of the Yield Of Aunp-plu-uv Productionsupporting

confidence: 66%

Section: Kinetics Of Uv-assisted Synthesis Of Aunp-plumentioning

confidence: 94%

Section: Kinetics Of Uv-assisted Synthesis Of Aunp-plumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

UV-Accelerated Synthesis of Gold Nanoparticle–Pluronic Nanocomposites for X-ray Computed Tomography Contrast Enhancement

et al. 2023

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“…This nanomaterial (of approximately 7 nm) exhibited high catalytic activity for the chemical reduction of 4-NP. In addition, Santos et al [51] presented the synthesis of AuNPs using Pluronic F127 as stabilizer. The polymer concentration was a fundamental parameter in the growth of the nanoparticle.…”

Section: Catalysismentioning

confidence: 99%

Nanoengineering of Gold Nanoparticles: Green Synthesis, Characterization, and Applications

et al. 2019

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The fundamental aspects of the manufacturing of gold nanoparticles (AuNPs) are discussed in this review. In particular, attention is devoted to the development of a simple and versatile method for the preparation of these nanoparticles. Eco-friendly synthetic routes, such as wet chemistry and biosynthesis with the aid of polymers, are of particular interest. Polymers can act as reducing and/or capping agents, or as soft templates leading to hybrid nanomaterials. This methodology allows control of the synthesis and stability of nanomaterials with novel properties. Thus, this review focus on a fundamental study of AuNPs properties and different techniques to characterize them, e.g., Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM), UV-Visible spectroscopy, Dynamic Light Scattering (DLS), X-Ray Diffraction (XRD), X-Ray Photoelectron Spectroscopy, Small-angle X-Ray Scattering (SAXS), and rheology. Recently, AuNPs obtained by “green” synthesis have been applied in catalysis, in medicine, and as antibacterials, sensors, among others.

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Triblock copolymer-mediated synthesis of catalytically active gold nanostructures

Cited by 2 publications

References 38 publications

UV-Accelerated Synthesis of Gold Nanoparticle–Pluronic Nanocomposites for X-ray Computed Tomography Contrast Enhancement

UV-Accelerated Synthesis of Gold Nanoparticle–Pluronic Nanocomposites for X-ray Computed Tomography Contrast Enhancement

Nanoengineering of Gold Nanoparticles: Green Synthesis, Characterization, and Applications

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