Monitoring the Photothermal Reshaping of Individual Plasmonic Nanorods with Coherent Mechanical Oscillations

Picca, Fabricio Leandro Della; Gutiérrez, Marina V.; Bragas, Andrea V.; Scarpettini, Alberto F.

doi:10.1021/acs.jpcc.8b09458

Cited by 6 publications

(2 citation statements)

References 39 publications

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“…The temperature can be estimated when the GNR absorbs one pulse energy as , , where the room temperature T r ≈ 23 °C, σ abs is the absorption cross section, ⟨ I ⟩ is the average irradiance, f r is the laser repetition rate, V NR is the GNR volume, ρ Au , and c Au are the gold density and heat capacity at constant pressure, respectively. As can be seen, the maximum temperature increment does not depend on the thermal properties of the environment, because the peak temperature of the nanoparticle is reached before the dissipation to the surroundings begins. , …”

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Determination of Nanoscale Mechanical Properties of Polymers via Plasmonic Nanoantennas

et al. 2020

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Nanotechnology and the consequent emergence of miniaturized devices are driving the need to improve our understanding of the mechanical properties of a myriad of materials. Here we focus on amorphous polymeric materials and introduce a new way to determine the nanoscale mechanical response of polymeric thin films in the GHz range, using ultrafast optical means.Coupling of the films to plasmonic nanoantennas excited at their vibrational eigenfrequencies allows the extraction of the values of the mechanical moduli as well as the estimation of the glass transition temperature via time-domain measurements, here demonstrated for PMMA films. This nanoscale method can be extended to the determination of mechanical and elastic properties of a wide range of spatially strongly confined materials.

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Determination of Nanoscale Mechanical Properties of Polymers via Plasmonic Nanoantennas

et al. 2020

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“…Next to the above‐mentioned factors, the NP's environment plays a pivotal role due to possible hindrance of surface atom diffusion and its effect on heat dissipation. [ 19,21–25 ] To improve the robustness and durability in applications, surface coating of NPs was investigated, with silica‐coated Au NPs emerging as one of the most well‐suited systems in practice. [ 26,27 ] For biomedical applications, for example, silica coatings were shown to provide biocompatibility, large surface areas for drug delivery and prevent aggregation of NPs inside cells.…”

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confidence: 99%

3D Atomic‐Scale Dynamics of Laser‐Light‐Induced Restructuring of Nanoparticles Unraveled by Electron Tomography

et al. 2021

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Understanding light–matter interactions in nanomaterials is crucial for optoelectronic, photonic, and plasmonic applications. Specifically, metal nanoparticles (NPs) strongly interact with light and can undergo shape transformations, fragmentation and ablation upon (pulsed) laser excitation. Despite being vital for technological applications, experimental insight into the underlying atomistic processes is still lacking due to the complexity of such measurements. Herein, atomic resolution electron tomography is performed on the same mesoporous‐silica‐coated gold nanorod, before and after femtosecond laser irradiation, to assess the missing information. Combined with molecular dynamics (MD) simulations based on the experimentally determined 3D atomic‐scale morphology, the complex atomistic rearrangements, causing shape deformations and defect generation, are unraveled. These rearrangements are simultaneously driven by surface diffusion, facet restructuring, and strain formation, and are influenced by subtleties in the atomic distribution at the surface.

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Polymer Co‐Coating of Gold Nanoparticles Enables Their Integration Into Contact Lenses for Stable, Selective Ocular Light Filters

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Chen

McCabe

et al. 2022

Adv Materials Inter

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animal models, [3][4][5][6][7][8][9] potentially by overstimulating long-wavelength (L-)cone cells in the eye. [10] While red-light exposure is considered a plausible factor in myopia progression for humans, [11] empirical evidence is lacking due in part to limited technological capabilities in broadly studying the influence of red-light exposure on humans. Thus, this work focuses on developing a platform technology as selective, tunable red-light filters for the human ocular environment. As the specific wavelength(s) of myopia-associated red light remain unknown in humans, we set out to design wearable light blockers with tunable peak wavelengths between 600 and 800 nm with a narrow bandwidth.Contact lenses are a common ocular prosthetic device worn by over 140 million people globally for vision correction. [12] Contact lenses are generally classified as hard or soft depending on their degree of rigidity. Soft contact lenses, which are comprised of crosslinked hydrophilic polymers that form a water-swollen, flexible hydrogel, make up the vast majority of contact lens sales worldwide. [13] Properties such as water content, wettability, oxygen permeability, and degree of flexibility are influenced by the composition of polymers in the hydrogel, and influence wearer comfort. One widely used hydrogel formulation is etafilcon A, a mixture of (hydroxyethyl)methacrylate (HEMA) and methacrylic acid (MAA). [13] UV light curing initiates free-radical polymerization for etafilcon A, producing an ionic hydrogel matrix with an equilibrium water content (EWC) of 58.5% after hydration. [13] There are three main methods to manufacture contact lenses: lathe cutting, spin casting, and cast molding. [14] Cast molding has emerged as the dominant technology in high-volume lens manufacture and is generally implemented in a continuous, automated production line. [15] This method uses complementary male and female concave molds to shape the liquid monomer mixture, then curing solidifies the material to produce the contact lens. [14,15] For facile incorporation into this process, we envision the mixing of a small volume of our light blocking platform with etafilcon A prior to curing.Many light-blocking strategies have been previously incorporated into contact lenses. Tinted lenses have been developed using both organic dyes [16] and naturally occurring pigments [17] Chronic exposure to long-wavelength (red) light is associated with increased incidence and progression of myopia in preclinical models. Contact lenses are worn worldwide while chronic exposure to red light occurs, presenting a natural platform to mitigate light-induced myopia progression. However, the integration of stable red-light filters into contact lenses remains elusive. Here, bipyramidal gold nanoparticles (BPs) are synthesized as selective, tunable red-light blockers and a surface-modification method is developed to homogeneously embed them within contact lenses during manufacturing. By functionalizing the BPs with a combination of poly(vinylpyrrolidone) and methacry...

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Monitoring the Photothermal Reshaping of Individual Plasmonic Nanorods with Coherent Mechanical Oscillations

Cited by 6 publications

References 39 publications

Determination of Nanoscale Mechanical Properties of Polymers via Plasmonic Nanoantennas

Determination of Nanoscale Mechanical Properties of Polymers via Plasmonic Nanoantennas

3D Atomic‐Scale Dynamics of Laser‐Light‐Induced Restructuring of Nanoparticles Unraveled by Electron Tomography

Polymer Co‐Coating of Gold Nanoparticles Enables Their Integration Into Contact Lenses for Stable, Selective Ocular Light Filters

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