New concept of radiolytic synthesis of gold nanoparticles in continuous flow

Toro-González, Miguel; Clifford, Dustin M.; Molina, Marı́a; Castano, Carlos E.; Rojas, Jessika V.

doi:10.1016/j.radphyschem.2021.109614

Cited by 9 publications

(4 citation statements)

References 36 publications

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“…By exploiting the formation of Au 0 as a marker for notable radiolysis, these observations demonstrate that this effect must be considered even when specimen are exposed to low dose rates. These findings are in-line with further studies on gold reduction observed in photon-mediated radiation chemistry caused by lasing, [75,76] UV exposure, [77] or 𝛾-irradiation, [54,59,60,[78][79][80][81] mostly performed at dose rates many orders of magnitude lower than those utilized in synchrotron-beam lines or experiments.…”

Section: Dose Rate Requirements For Gold Nanostructure Growthsupporting

confidence: 86%

Radiolysis‐Driven Evolution of Gold Nanostructures – Model Verification by Scale Bridging In Situ Liquid‐Phase Transmission Electron Microscopy and X‐Ray Diffraction

et al. 2022

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Utilizing ionizing radiation for in situ studies in liquid media enables unique insights into nanostructure formation dynamics. As radiolysis interferes with observations, kinetic simulations are employed to understand and exploit beam‐liquid interactions. By introducing an intuitive tool to simulate arbitrary kinetic models for radiation chemistry, it is demonstrated that these models provide a holistic understanding of reaction mechanisms. This is shown for irradiated HAuCl4 solutions allowing for quantitative prediction and tailoring of redox processes in liquid‐phase transmission electron microscopy (LP‐TEM). Moreover, it is demonstrated that kinetic modeling of radiation chemistry is applicable to investigations utilizing X‐rays such as X‐ray diffraction (XRD). This emphasizes that beam‐sample interactions must be considered during XRD in liquid media and shows that reaction kinetics do not provide a threshold dose rate for gold nucleation relevant to LP‐TEM and XRD. Furthermore, it is unveiled that oxidative etching of gold nanoparticles depends on both, precursor concentration, and dose rate. This dependency is exploited to probe the electron beam‐induced shift in Gibbs free energy landscape by analyzing critical radii of gold nanoparticles.

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Section: Dose Rate Requirements For Gold Nanostructure Growthsupporting

confidence: 86%

Radiolysis‐Driven Evolution of Gold Nanostructures – Model Verification by Scale Bridging In Situ Liquid‐Phase Transmission Electron Microscopy and X‐Ray Diffraction

et al. 2022

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“…gold and silver), are generally formed upon nucleation and growth from the precursor metal ions [30,31]. For dosimetric applications, the ionizing radiation is employed to produce aqueous electrons, which are responsible for reducing the metal ions [32][33][34]. Both nucleation and growth processes should be carefully controlled in order to optimize the formation of the MNPs and, consequently, improve their role as dosimeters.…”

Section: Introductionmentioning

confidence: 99%

“…The quick heating and cooling processes associated with the microfluidic approaches can, for instance, lead to a better control of the nanoparticles size [48,49]. Those features attracted the interest on the microreactors for MNP synthesis [32].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic radius dictates sensitivity of x-ray detectors based on the radiomicrofluidic synthesis of colloidal silver

Nunes

Guidelli

2023

Nanotechnology

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A radiolytic synthesis of silver nanoparticles was carried out in combination with a microfluidic method to produce liquid radiation detectors. The detector response was analyzed by correlating the absorbed dose with the dispersion’s absorbance and with the hydrodynamic radius (HR). Samples were irradiated with X-rays of varying beam energies and dose rates and the data were discussed to elucidate how nucleation and growth processes are affected by the radiation quantities. Results reveal that HR does not change with the absorbed dose, but can be well controlled by varying the precursors concentration, beam energy, and dose rate. Increased precursor concentrations or dose rates favor nucleation, leading to the formation of smaller HR particles and increased detector sensitivity. Upon increasing the X-ray energy, growth is favored, leading to larger HR and decreased detector sensitivity. It is shown that HR and detector sensitivity are strongly correlated so that HR dictates detection sensitivity: The smaller the HR, the higher the sensitivity. Therefore, the dependence of the HR on the dose rate and on the X-ray energy establishes a new method for the controlled growth of colloidal silver, besides opening new possibilities for ionizing radiation detection.

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“…Likewise, the radiation-initiated polymerization allows one to obtain materials without residues of initiators or catalysts and makes it possible to carry out reactions at ambient temperature [ 15 , 16 , 17 , 19 ]. The adjustment of radiation parameters such as the radiation type (X- and γ-rays, or fast electrons), dose rate and total absorbed dose over a wide range provides great advantages for obtaining materials with versatile functional properties [ 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Assembling of Metal-Polymer Nanocomposites in Irradiated Solutions of 1-Vinyl-1,2,4-triazole and Au(III) Ions: Features of Polymerization and Nanoparticles Formation

Zharikov

Zezina²,

Vinogradov³

et al. 2022

Polymers

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Gold nanoparticles (AuNPs) stabilized with poly(1-vinyl-1,2,4-triazole) (PVT) have been synthesized via a one-pot manner in irradiated solutions of 1-vinyl-1,2,4-triazole (VT) and Au(III) ions. The transmission electron microscopy examinations have shown that the sizes of nanoparticles formed range from 1 to 11 nm and are affected by the ratio of VT to gold ions. To study the kinetics peculiarities of the VT polymerization and assembling of AuNPs, UV-Vis spectroscopy was used. The analysis of the data obtained reveals that an inhibition period, influenced by Au(III) concentration, is followed by the polymerization of a monomer. Importantly, the absorbed doses, corresponding to the onset of rapid polymerization, correlate with the doses at which the accelerated formation of AuNPs begins. The kinetics aspects, which could lead to such an effect, are discussed.

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New concept of radiolytic synthesis of gold nanoparticles in continuous flow

Cited by 9 publications

References 36 publications

Radiolysis‐Driven Evolution of Gold Nanostructures – Model Verification by Scale Bridging In Situ Liquid‐Phase Transmission Electron Microscopy and X‐Ray Diffraction

Radiolysis‐Driven Evolution of Gold Nanostructures – Model Verification by Scale Bridging In Situ Liquid‐Phase Transmission Electron Microscopy and X‐Ray Diffraction

Hydrodynamic radius dictates sensitivity of x-ray detectors based on the radiomicrofluidic synthesis of colloidal silver

Assembling of Metal-Polymer Nanocomposites in Irradiated Solutions of 1-Vinyl-1,2,4-triazole and Au(III) Ions: Features of Polymerization and Nanoparticles Formation

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