On the size and morphological characterization of needle-shaped TiO<sub>2</sub>nanoparticles in suspension

Onofri, Fabrice; Pelcé, Chantal; Meister, Lionel; Montet, Cédric; Pelcé, Pierre; Barbosa, Séverine; Sentis, Matthias; Bizi, Mohamed

doi:10.1117/12.2063938

Cited by 2 publications

(4 citation statements)

References 19 publications

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“…Note that LES sensitivity to the particle shape can be significantly increased when particles with high aspect ratio are oriented along the incident electric field direction, as proved recently by the present authors (Onofri et al. 2014).…”

Section: Summary Of Light Extinction Spectroscopy (Les) Methodssupporting

confidence: 85%

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An introduction to light extinction spectrometry as a diagnostic for dust particle characterisation in dusty plasmas

et al. 2016

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In this article, a detailed introduction of the light extinction spectrometry (LES) diagnostics is given. LES allows the direct in situ measurement of the particle size distribution and absolute concentration of dust clouds levitating in plasmas. Using a relatively simple and compact experimental set-up, the dust cloud parameters can be recovered with a good accuracy making minimum assumptions on their physical properties. Special emphases are given to the inversion procedure of light extinction spectra and all the required particle shape, refractive index and light extinction models. The parameter range and the limitations of LES are discussed. Two measurements in low-pressure gas discharges are presented: (i) in a direct-current (DC) glow discharge in which nanoparticles are growing from the sputtering of a tungsten cathode and (ii) in an argon–silane radio-frequency discharge. They demonstrate the capabilities of the LES technique to characterise, in situ and in real-time, the growth dynamics of nanoparticles in the size range 5–100 nm and volume concentrations in the range from a few ppb to a few ppm.

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Section: Summary Of Light Extinction Spectroscopy (Les) Methodssupporting

confidence: 85%

“…Although, not detailed in this article, it was also shown recently that LES can also characterise particle with high aspect ratio, provided that they are oriented along the polarization direction of the probing beam (Onofri et al. 2014).…”

Section: Resultsmentioning

confidence: 93%

An introduction to light extinction spectrometry as a diagnostic for dust particle characterisation in dusty plasmas

et al. 2016

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“…Increasing substantially the optical path length [47] and integrating a microfluidiccontrolled optical router [48] for multiplexed analyses with a single spectrometer would also be a benefit for practical applications. The consideration of particles with more complex shapes and compositions [30,33,35,36], as well as multiple scattering or polarization effects [41,42], is also part of the perspectives of the present work.…”

Section: Discussionmentioning

confidence: 99%

“…In practice, this sets upper limits on the size of the particles and the optical density of the medium. Inelastic scattering processes [40] and polarization effects [41,42] are also neglected in the standard working principles of LES. Knowledge of the composition and morphology of the particles are also required, even if both can be inferred in some situations [26,31,33,35,36].…”

Section: Introductionmentioning

confidence: 99%

Microfluidic lab-on-a-chip characterization of nano- to microparticles suspensions by light extinction spectrometry

Onofri

Rodríguez-Ruiz²,

Lamadie

2022

Opt. Express

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The analysis of nano-and microparticle suspensions with micro systems affords improved space-time yields, selectivity, reaction residence times and conversions capabilities. These capabilities are of primary importance in various fields of research and industry. The few microfluidic lab-on-a-chip approaches that have been developed are essentially designed to analyse fluid phases or involve the use of benchtop particle sizing instruments. We report a novel microscale approach to characterize the particle size distribution and absolute concentration of colloidal suspensions. The method is based on a photonic lab-on-a-chip with three scale-specific detection channels to record simultaneous light extinction spectra. Experiments carried out on particle standards with sizes ranging from 30 nm to 0.5 µm and volume concentrations of 1 to 1000ppm, clearly demonstrate the value and potential of the proposed method.

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On the size and morphological characterization of needle-shaped TiO₂nanoparticles in suspension

Cited by 2 publications

References 19 publications

An introduction to light extinction spectrometry as a diagnostic for dust particle characterisation in dusty plasmas

An introduction to light extinction spectrometry as a diagnostic for dust particle characterisation in dusty plasmas

Microfluidic lab-on-a-chip characterization of nano- to microparticles suspensions by light extinction spectrometry

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On the size and morphological characterization of needle-shaped TiO2nanoparticles in suspension

Cited by 2 publications

References 19 publications

An introduction to light extinction spectrometry as a diagnostic for dust particle characterisation in dusty plasmas

An introduction to light extinction spectrometry as a diagnostic for dust particle characterisation in dusty plasmas

Microfluidic lab-on-a-chip characterization of nano- to microparticles suspensions by light extinction spectrometry

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On the size and morphological characterization of needle-shaped TiO₂nanoparticles in suspension