Spectroscopic models for laser-heated silicon and copper nanoparticles

Daun, Kyle J.; Menser, Jan; Mansmann, Raphael; Moghaddam, Sina Talabi; Dreier, Thomas; Schulz, Christof

doi:10.1016/j.jqsrt.2016.10.006

Cited by 21 publications

(12 citation statements)

References 39 publications

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“…These calculations were supported by the ellipsometry measurements of the molten bulk material. The results of the extinction coefficient measurements obtained by LOSA for Cu and Si NPs in [23] are in good agreement with the data calculated by Drude theory. These data are not included in the Table 2, because these are not obtained by pulse laser-heating method.…”

Section: Non-soot Particlessupporting

confidence: 86%

“…The variation of extinction measurements is the lineof-sight attenuation (LOSA), which is typically used for spatially resolved soot concentration diagnostics [22]. Concerning the subject of this review, the data on the extinction coefficient measurements obtained by LOSA for Cu and Si NPs are presented in [23] and compared with the electrical permittivity data calculated by Drude theory. Notably, the extinction coefficients were presented in the visible and near infrared range of the spectra, thus facilitating the determination of the E(m) ratio at different wavelengths in two-color or spectra-resolved temperature measurements of laser-heated NPs.…”

Section: The Methods Of Determining the Optical Properties Of Npsmentioning

confidence: 99%

“…However, the LII measurements of the size distribution of NPs apart from Fe NPs have been carried out in recent years. The spectroscopic models of silicon and copper NPs [23,37,38], as well as the spectroscopic models for Ag, Fe and Mo NPs have been presented [39]. These models are based on the calculations of the electrical permittivity of the molten bulk material in dependence on the wavelength performed using Drude theory.…”

Section: Non-soot Particlesmentioning

confidence: 99%

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A review on determining the refractive index function, thermal accommodation coefficient and evaporation temperature of light-absorbing nanoparticles suspended in the gas phase using the laser-induced incandescence

Gurentsov

2018

Nanotechnology Reviews

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In this review, the possibility of using pulsed, nanosecond laser heating of nanoparticles (NPs) is demonstrated, in order to investigate their thermo-physical properties. This approach is possible because the laser heating produces high NP temperatures that facilitate the observation of their thermal radiation (incandescence). This incandescence depends on the thermo-physical properties of the NPs, such as heat capacity, density, particle size, volume fraction and the refractive index of the particle material, as well as on the heat-mass transfer between the NPs and the surrounding gas media. Thus, the incandescence signal carries information about these properties, which can be extracted by signal analyses. This pulsed laser heating approach is referred to as laser-induced incandescence. Here, we apply this approach to investigate the properties of carbon, metal and carbon-encapsulated Fe NPs. In this review, the recent results of the measurements of the NP refractive index function, thermal energy accommodation coefficient of the NP surface with bath gas molecules and the NP evaporation temperature obtained using laser-induced incandescence are presented and discussed.

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Section: Non-soot Particlessupporting

confidence: 86%

Section: The Methods Of Determining the Optical Properties Of Npsmentioning

confidence: 99%

Section: Non-soot Particlesmentioning

confidence: 99%

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A review on determining the refractive index function, thermal accommodation coefficient and evaporation temperature of light-absorbing nanoparticles suspended in the gas phase using the laser-induced incandescence

Gurentsov

2018

Nanotechnology Reviews

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“…Due to these properties, they are utilized step by step as part of different applications, for example, in gas sensors, catalysis, thermal vitality, batteries and heat transfer fluids to name a few [9][10][11][12][13]. A number of methods are currently being used to prepare CuNPs, which also include sonochemical reduction, thermal reduction, capping agent method, induced radiation, vapour deposition method, laser irradiation and microemulsion techniques [14][15][16][17][18][19]. But, these methods come with few drawbacks, namely, incurring high maintenance towards the equipments, transferring hazardous chemicals to the environment and also the low availability of resources [20].…”

Section: A C C E P T E Dmentioning

confidence: 99%

Antibacterial and antioxidant potential of biosynthesized copper nanoparticles mediated through Cissus arnotiana plant extract

Rajeshkumar

Menon

Kumar

et al. 2019

Journal of Photochemistry and Photobiology B: Biology

295

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Environment friendly methods for the synthesis of copper nanoparticles have become a valuable trend in the current scenario. The utilization of phytochemicals from plant extracts has become a unique technology for the synthesis of nanoparticles, as they possess dual nature of reducing and capping agents to the nanoparticles. In the present investigation we have synthesized copper nanoparticles (CuNPs) using a rare medicinal plant Cissus arnotiana and evaluated their antibacterial activity against gram negative and gram positive bacteria.The morphology and characterization of the synthesized CuNPs were studied and done using UV-Visible spectroscopy at a wavelength range of 350-380nm. XRD studies were performed for analyzing the crystalline nature; SEM and TEM for evaluating the spherical shape within the size range of 60-90nm and AFM was performed to check the surface roughness. The biosynthesized CuNPs showed better antibacterial activity against the gram-negative bacteria, E. coli with an inhibition zone of 22.20±0.16 mm at 75µg/ml. The antioxidant property observed was comparatively equal with the standard antioxidant agent ascorbic acid at a maximum concentration of 40 µg/ ml. This is the first study reported on C. arnotiana mediated biosynthesis of copper nanoparticles, where we believe that the findings can pave way for a new direction in the field of nanotechnology and nanomedicine where there is a significant potential for antibacterial and antioxidant activities. We predict that, these could lead to an exponential increase in the field of biomedical applications, with the utilization of green synthesized CuNPs, due to its remarkable properties. The highest antibacterial property was observed with gram-negative strains mainly, E. coli, due to its thin peptidoglycan layer and electrostatic interactions between the bacterial cell wall and CuNPs surfaces. Hence, CuNPs can be potent therapeutic agents in several biomedical applications, which are yet to be explored in the near future.

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“…Within this context, one would typically use a broadband light source and spectrometer–camera combination [ 197 , 205 ] to obtain spectral information over both the LII absorption and detection wavelengths. LOSA measurements targeted the optical properties of several TiRe-LII materials systems, including aerosols of liquid germanium [ 206 ], silicon [ 40 , 95 ], and copper [ 40 ] nanoparticles. Depending on the complexity of the underlying materials system, LOSA can be used to infer more fundamental information that can be used to parameterize physical models, such as the Drude model for metals, the Lorentz oscillator model for materials with interband transitions, or semiconductors.…”

Section: Combined and Complementary Diagnosticsmentioning

confidence: 99%

Laser-induced incandescence for non-soot nanoparticles: recent trends and current challenges

et al. 2022

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Laser-induced incandescence (LII) is a widely used combustion diagnostic for in situ measurements of soot primary particle sizes and volume fractions in flames, exhaust gases, and the atmosphere. Increasingly, however, it is applied to characterize engineered nanomaterials, driven by the increasing industrial relevance of these materials and the fundamental scientific insights that may be obtained from these measurements. This review describes the state of the art as well as open research challenges and new opportunities that arise from LII measurements on non-soot nanoparticles. An overview of the basic LII model, along with statistical techniques for inferring quantities-of-interest and associated uncertainties is provided, with a review of the application of LII to various classes of materials, including elemental particles, oxide and nitride materials, and non-soot carbonaceous materials, and core–shell particles. The paper concludes with a discussion of combined and complementary diagnostics, and an outlook of future research.

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Spectroscopic models for laser-heated silicon and copper nanoparticles

Cited by 21 publications

References 39 publications

A review on determining the refractive index function, thermal accommodation coefficient and evaporation temperature of light-absorbing nanoparticles suspended in the gas phase using the laser-induced incandescence

A review on determining the refractive index function, thermal accommodation coefficient and evaporation temperature of light-absorbing nanoparticles suspended in the gas phase using the laser-induced incandescence

Antibacterial and antioxidant potential of biosynthesized copper nanoparticles mediated through Cissus arnotiana plant extract

Laser-induced incandescence for non-soot nanoparticles: recent trends and current challenges

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