Light-to-heat conversion and heating of single nanoparticles, their assemblies, and the surrounding medium under laser pulses

Pustovalov, V. K.

doi:10.1039/c6ra11130k

Cited by 58 publications

(36 citation statements)

References 119 publications

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“…The electron relaxations and electron-phonon coupling occur on the time scale of few picoseconds, while phonon-phonon interactions take up to a few nanoseconds. [32][33][34][35] Since Ag NPs grow more slowly than the electron-phonon interaction speed, the classical thermal 9 diffusion equation is introduced:…”

Section: Heatingmentioning

confidence: 99%

Laser-Generated Ag Nanoparticles in Mesoporous TiO₂ Films: Formation Processes and Modeling-Based Size Prediction

Bakhti

Rudenko

et al. 2019

J. Phys. Chem. C

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Controlling the formation of nanoparticles (NPs) by direct laser writing ensures an efficient way of engineering the optical responses of nanocomposite materials through adjusting laser parameters such as power, focusing, and writing speed. The growth of NPs, photooxidation, and reduction affect the light absorption by an ensemble of laser-activated NPs. However, those self-consistent processes are not well understood. Previous studies explained the growth or shrinkage of silver NPs by neglecting heat diffusion. It remained unclear, however, how the NP size can be controlled by the laser writing speed. In this work, based on the coupled calculations of size variation, heat diffusion, and light absorption by an ensemble of NPs, we propose a two-dimensional model taking into account the spatial information of size and temperature. The spatial size distribution is revealed to be nonuniform, leading to the transmission inhomogeneity along the laser written lines. This fact is confirmed by the in situ transmission experiments. The performed study also depicts a novel view in which NPs grow ahead of the laser beam center because of the heat diffusion. The nonlinear growth never stops until it exhausts the majority of the free Ag 0 in the matrix, while the amount of Ag 0 by reduction cannot compensate the consumption. After that, the photo-oxidation dominates the process and finally controls the writing speed dependency of NP's size. The simulations also show that it is not the activation energy of Ag 0 diffusion, but the ionization efficiency affects the final NP size, which helps to understand how to improve the laser processing of differently prepared samples.

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Section: Heatingmentioning

confidence: 99%

Laser-Generated Ag Nanoparticles in Mesoporous TiO₂ Films: Formation Processes and Modeling-Based Size Prediction

Bakhti

Rudenko

et al. 2019

J. Phys. Chem. C

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“…The parameter P 1 ¼ K abs =K sca is greater than 1, P 1 [ 1 or P 1 ) 1 ð Þ , and the factor of absorption K abs is greater (or much greater in favorable cases) than the scattering factor K sca in the cases of predominant role of absorption. This situation allows to achieve maximal efficiency of solar radiation interaction with NP, resulting in maximal NP heating [18][19][20][21][22].…”

Section: Light-absorption Conditions For a Single Nanoparticlementioning

confidence: 99%

“…is the initial NP and ambient medium temperature, k m is the coefficient of medium heat conduction, and the wavelengths k 1 , k 2 are the boundaries of the optical spectrum under consideration. This equation has been obtained from NP energy conservation equation taken into account radiation absorption, NP heating and heat loss inside the surrounding medium because of heat conduction [18][19][20][21][22]. The coefficient of heat conduction has constant value for water k m = 6.10 -3 W/cmK [23], and this assumption is based on the rather small temperature interval of NP heating of smaller than 100°C.…”

Section: Light-absorption Conditions For a Single Nanoparticlementioning

confidence: 99%

“…A maximal value of NP heating (depending on integral) is achieved under maximal close (approach) between the dependencies of selected K abs (k) and the well-known dependence of solar irradiance I S (k). It is also necessary to use the selected NP with maximal possible values r max 0 and K max abs [18][19][20][21][22]. The values of indexes n 0k , , 0k and n k [24,25] were used for calculation of the factors of absorption K abs and scattering K sca .…”

Section: Light-absorption Conditions For a Single Nanoparticlementioning

confidence: 99%

“…The achievement of maximal value T 0max of NP temperature under CW solar irradiation is described by [18][19][20][21][22] …”

Section: Light-absorption Conditions For a Single Nanoparticlementioning

confidence: 99%

See 2 more Smart Citations

Light-absorption selection of nanoparticles and nanofluids containing nanoparticles for their effective heating by solar radiation

Pustovalov

Astafyeva

Fritzsche

2017

Nanotechnol. Environ. Eng.

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Light-absorption selection of single nanoparticle for solar radiation requires the simultaneous fulfillment of all of the following novel conditions-maximal close (overlap) of the dependence of nanoparticle efficiency absorption factor on wavelength with the dependence solar irradiance, predominant role of nanoparticle absorption over its scattering, the use of maximal values of nanoparticle efficiency absorption factor and its size. These results highlight the possibility for effective application of single homogeneous Ti and core-shell Ti-TiO 2 , Ni-NiO nanoparticles with radii of about 75 nm as perfect absorbers for solar radiation in the complete optical spectrum 250-2500 nm. Light-absorption conditions for nanofluids include dominant radiation absorption by presented nanoparticles with selected properties and concentrations of about 1 9 10 9 , 1 9 10 10 cm -3 under the solar absorption by water in the spectral interval of 250-1000 nm, which includes * 70% of whole solar energy. Presented results can be applied for applications in the development of novel working nanofluids for direct absorption solar collectors. These conditions can be used for the selection of various nanoparticles from different materials and structures for other optical radiation sources.

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Contact‐Free Remote Manipulation of Hydrogel Properties Using Light‐Triggerable Nanoparticles: A Materials Science Perspective for Biomedical Applications

Choi

Chakraborty

Coyle

et al. 2022

Adv Healthcare Materials

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Considerable progress has been made in synthesizing "intelligent", biodegradable hydrogels that undergo rapid changes in physicochemical properties once exposed to external stimuli. These advantageous properties of stimulus-triggered materials make them highly appealing to diverse biomedical applications. Of late, research on the incorporation of light-triggered nanoparticles (NPs) into polymeric hydrogel networks has gained momentum due to their ability to remotely tune hydrogel properties using facile, contact-free approaches, such as adjustment of wavelength and intensity of light source. These multi-functional NPs, in combination with tissue-mimicking hydrogels, are increasingly being used for on-demand drug release, preparing diagnostic kits, and fabricating smart scaffolds. Here, the authors discuss the atomic behavior of different NPs in the presence of light, and critically review the mechanisms by which NPs convert light stimuli into heat energy. Then, they explain how these NPs impact the mechanical properties and rheological behavior of NPs-impregnated hydrogels. Understanding the rheological behavior of nanocomposite hydrogels using different sophisticated strategies, including computer-assisted machine learning, is critical for designing the next generation of drug delivery systems. Next, they highlight the salient strategies that have been used to apply light-induced nanocomposites for diverse biomedical applications and provide an outlook for the further improvement of these NPs-driven light-responsive hydrogels.

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Light-to-heat conversion and heating of single nanoparticles, their assemblies, and the surrounding medium under laser pulses

Abstract: This review presents a platform for the description of the thermal processes of laser–nanoparticle interactions and their applications.

Cited by 58 publications

References 119 publications

Laser-Generated Ag Nanoparticles in Mesoporous TiO₂ Films: Formation Processes and Modeling-Based Size Prediction

Laser-Generated Ag Nanoparticles in Mesoporous TiO₂ Films: Formation Processes and Modeling-Based Size Prediction

Light-absorption selection of nanoparticles and nanofluids containing nanoparticles for their effective heating by solar radiation

Contact‐Free Remote Manipulation of Hydrogel Properties Using Light‐Triggerable Nanoparticles: A Materials Science Perspective for Biomedical Applications

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Light-to-heat conversion and heating of single nanoparticles, their assemblies, and the surrounding medium under laser pulses

Abstract: This review presents a platform for the description of the thermal processes of laser–nanoparticle interactions and their applications.

Cited by 58 publications

References 119 publications

Laser-Generated Ag Nanoparticles in Mesoporous TiO2 Films: Formation Processes and Modeling-Based Size Prediction

Laser-Generated Ag Nanoparticles in Mesoporous TiO2 Films: Formation Processes and Modeling-Based Size Prediction

Light-absorption selection of nanoparticles and nanofluids containing nanoparticles for their effective heating by solar radiation

Contact‐Free Remote Manipulation of Hydrogel Properties Using Light‐Triggerable Nanoparticles: A Materials Science Perspective for Biomedical Applications

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Product

Resources

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Laser-Generated Ag Nanoparticles in Mesoporous TiO₂ Films: Formation Processes and Modeling-Based Size Prediction

Laser-Generated Ag Nanoparticles in Mesoporous TiO₂ Films: Formation Processes and Modeling-Based Size Prediction