Heating, evaporation and combustion of a solid aerosol particle in a gas exposed to optical radiation

Abstract:In medical applications of laser and nanotechnology to diagnosis and treat cancer or microorganisms, understanding of lased-induced photothermal (PT) and accompanied phenomena around nanoparticles are crucial for optimization and bringing this promising technology to bedside. We analyzed the main PT-based effects in and around gold nanoparticles under action of short (nano-, pico-, and femtosecond) laser pulses with focus on photoacoustic effects due to the thermal expansion of nanoparticles and liquid around them, thermal protein denaturation, explosive liquid vaporization, melting and evaporation of nanoparticle, optical breakdown initiated by nanoparticles and accompanied to shock waves and explosion (fragmentation) of gold nanoparticles. Characteristic parameters for these processes such as the temperature and pressures levels, and laser intensity thresholds among others are summarized to provide basis for comparison of different mechanisms of selective nanophotothermolysis and diagnostics of different targets (e.g., cancer cells, bacteria, viruses).

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“…After integration of (1) over interval of time from t = 0 to t we have the law of conversation of nanoparticle energy [45]:…”

Section: Analytical Model Of Heating Of Nanoparticle By Short Laser P...mentioning

confidence: 99%

Photothermal and accompanied phenomena of selective nanophotothermolysis with gold nanoparticles and laser pulses

2008

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“…Исследование двухслойных наночастиц, состоящих из металлического ядра и окисной оболочки, также очень интересно для улучшения и манипуляции резонансами плазменного спектра наночастиц в дополнение к чистым металлическим наночастицам. Образование окисной оболочки на металлической наночастице может быть достигнуто различными химическими [25] и физическими [26,27] методами и в результате естественного окисления металлических наночастиц в реактивной среде. Естественное окисление чистых металлических наночастиц в газообразных или жидких средах, содержащих компоненты кислорода (воздух, вода, пар), приводит к образованию тонкой окисной оболочки толщиной около 5−10 nm на металлических наночастицах.…”

Section: Introductionunclassified

Анализ Оптических Свойств Однородных Металлических, Окисных Наночастиц И Двухслойных Наночастиц С Металлическим Ядром И Окисной Оболочкой С Целью Эффективного Поглощения Солнечной Радиации

Астафьева¹,

Пустовалов²,

Фритче³

2019

Журнал Технической Физики

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Problems related to using nanoparticles for absorption of solar radiation and photothermal nanotechnologies are now being actively studied. The efficiency of using nanoparticles as photothermal agents for solar energy is determined by their spectral optical properties. We performed computer simulation of optical properties of homogeneous metal (nickel, titanium, and molybdenum) nanoparticles and their oxides, along with nanoparticles consisting of a metal core and an oxide shell, with radii in the range from 50 to 100 nm in the spectral interval between 200 and 2500 nm. The influence of nanoparticle radius, the type of metal and its oxide on spectral coefficients of efficiency absorption ( K _abs) and scattering ( K _sca) of radiation by nanoparticles is investigated. The type of nanoparticles suitable for absorption of solar radiation was chosen based on a comparative analysis of the wavelength dependences of absorption efficiency coefficients K _abs, intensity of solar radiation I _ S , and parameter P _1 = K _abs/ K _sca. Spherical double–layer nanoparticles consisting of nickel or titanium core and oxide shells with a radius of 75 or 100 nm can be used in the spectral interval from 200 to 2500 nm for efficient absorption of solar radiation. These results are a substantial contribution to the investigation of optical properties of nanoparticles that can be used in systems of thermal energy.

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“…The action of intensive optical (laser) radiation and NP heating can cause oxidation of surface layer of metallic NP and the formation of oxide shell on NP. The laser processing of metallic NPs in air atmosphere can cause simultaneously increasing of oxide shell thickness on particle surface and its evaporation [35].…”

Section: Introductionmentioning

confidence: 99%

“…The formation of oxide shell on metallic NP can be achieved by different chemical [33,34] and physical [35] methods. The formation of thick oxide shell promotes the use of core-shell metal-oxide NPs in chemical nanotechnology.…”

Section: Introductionmentioning

confidence: 99%

Influence of Shell Parameters on Optical Properties of Spherical Metallic Core‐Oxide Shell Nanoparticles

Pustovalov

Astafyeva

2015

Journal of Nanomaterials

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Different metal homogeneous nanoparticles have been extensively studied in recent years due to their wide range of potential applications. It is very interesting to investigate core-shell nanoparticles with oxide shell from core metal. The formation of oxide shell on metallic nanoparticles can be achieved by different chemical and physical methods including also natural oxidation of pure metallic nanoparticles in gaseous or liquid media, containing oxygen components (air, water, etc.). We numerically calculated efficiency factors of absorption K abs , scattering K sca , and extinction K ext of radiation with wavelength in the spectral interval 150-1000 nm by spherical homogeneous metallic and two-layered (metal core -oxide metal shell) nanoparticles: Al, Al-Al 2 O 3 and Zn, Zn-ZnO with core radii in the range 5-50 nm and shell thickness 5 nm. Analysis of presented results has been carried out.

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Heating, evaporation and combustion of a solid aerosol particle in a gas exposed to optical radiation

Cited by 14 publications

References 6 publications

Photothermal and accompanied phenomena of selective nanophotothermolysis with gold nanoparticles and laser pulses

Photothermal and accompanied phenomena of selective nanophotothermolysis with gold nanoparticles and laser pulses

Influence of Shell Parameters on Optical Properties of Spherical Metallic Core‐Oxide Shell Nanoparticles

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