Photothermal motion: effect of low-intensity irradiation on the thermal motion of organic nanoparticles

Guernelli, Moreno; Bakalis, Evangelos; Mavridi-Printezi, Alexandra; Petropoulos, Vasilis; Cerullo, Giulio; Zerbetto, Francesco; Montalti, Marco

doi:10.1039/d2nr01041k

Cited by 5 publications

(4 citation statements)

References 54 publications

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“…Another possibility is the investigation of system behavior when the scaling exponent α is very small and friction itself behaves as a restoring force. In addition, the present work can support the study of systems where the diffusing particle has a density that allows the activation of hydrodynamic effects, for example nanostructures/nanoparticles moving on surfaces under the stimulus of either electrons [47] or light [48], and for which analysis showed intriguing behavior. [49].…”

Section: Discussionmentioning

confidence: 80%

Hydrodynamic Fluctuations in the Presence of One Parameter Mittag-Leffler Friction

Bakalis

Zerbetto

2023

Preprint

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Section: Discussionmentioning

confidence: 80%

Hydrodynamic Fluctuations in the Presence of One Parameter Mittag-Leffler Friction

Bakalis

Zerbetto

2023

Preprint

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“…Fast excitation energy dissipation is totally compatible with the high photoprotective action of eumelanin, since it suggests that the absence of long-living excited states prevents any photochemical reactivity and hence any phototoxicity. Moreover, the observation that deactivation occurs through a non-radiative path justifies the wide application of these materials as photothermal agents (PA) and hence as materials able to convert efficiently absorbed light (especially in the red/NIR region) into heat [ 47 , 48 ]. Nevertheless, it is well known that eumelanin presents some degree of photoreactivity.…”

Section: Properties Of Melaninmentioning

confidence: 99%

Melanin for Photoprotection and Hair Coloration in the Emerging Era of Nanocosmetics

Menichetti,

Mordini,

Vicenzi

et al. 2024

IJMS

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Nanotechnology is revolutionizing fields of high social and economic impact. such as human health preservation, energy conversion and storage, environmental decontamination, and art restoration. However, the possible global-scale application of nanomaterials is raising increasing concerns, mostly related to the possible toxicity of materials at the nanoscale. The possibility of using nanomaterials in cosmetics, and hence in products aimed to be applied directly to the human body, even just externally, is strongly debated. Preoccupation arises especially from the consideration that nanomaterials are mostly of synthetic origin, and hence are often seen as “artificial” and their effects as unpredictable. Melanin, in this framework, is a unique material since in nature it plays important roles that specific cosmetics are aimed to cover, such as photoprotection and hair and skin coloration. Moreover, melanin is mostly present in nature in the form of nanoparticles, as is clearly observable in the ink of some animals, like cuttlefish. Moreover, artificial melanin nanoparticles share the same high biocompatibility of the natural ones and the same unique chemical and photochemical properties. Melanin is hence a natural nanocosmetic agent, but its actual application in cosmetics is still under development, also because of regulatory issues. Here, we critically discuss the most recent examples of the application of natural and biomimetic melanin to cosmetics and highlight the requirements and future steps that would improve melanin-based cosmetics in the view of future applications in the everyday market.

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“…[15,16] Experiments conducted under low to moderate doses of light irradiation, which can be safely considered to not apply any additional force to the observed nanoentities, are of particular interest. [17] Such a system can be described by eq. ( 1) with µ = 2, ν = 1, F con = 0, and…”

Section: Introductionmentioning

confidence: 99%

Subdiffusive dynamics and hydrodynamic fluctuations: how the latter affect the former.

Bakalis,

Zerbetto

2024

J. Phys.: Conf. Ser.

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The characteristics of subdiffusion are influenced by hydrodynamic fluctuations, not the scaling of the mean square displacement (MSD) at the long time limit, but rather the transition of this property from ballistic behaviour at early times to its final scaling at large times. Additionally, since a significant portion of the normalised velocity autocorrelation function (NVAF), a widely used motion descriptor, no longer adequately describes the antipersistent character that is typical of a subdiffusive motion, it is also impacted by these fluctuations. The combined findings can lead to misleading conclusions if hydrodynamic fluctuations are not taken into account. Diffusing and vorticity time scales are crucial for the way the motion turns into the final subdiffusion dynamics, whose exponent is determined by the scaling of the friction.

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Photothermal motion: effect of low-intensity irradiation on the thermal motion of organic nanoparticles

Abstract: The effect of the local photo-triggered heat release on the motion of organic NP, a process that is itself thermal, under low intensity irradiation is largely unexplored. Here, we develop...

Cited by 5 publications

References 54 publications

Hydrodynamic Fluctuations in the Presence of One Parameter Mittag-Leffler Friction

Hydrodynamic Fluctuations in the Presence of One Parameter Mittag-Leffler Friction

Melanin for Photoprotection and Hair Coloration in the Emerging Era of Nanocosmetics

Subdiffusive dynamics and hydrodynamic fluctuations: how the latter affect the former.

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