The van de Hulst approximation for light scattering and its use for transmittance predictions in transparent ceramics

Hříbalová, Soňa; Pabst, Willi

doi:10.1016/j.jeurceramsoc.2019.12.044

Cited by 18 publications

(5 citation statements)

References 16 publications

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“…The scattering efficiency factor Q is the ratio of the real scattering cross section to the geometric cross section and depends on scatterer size, relative refractive index and wavelength, which are included in the terms m , x and p [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, this approach is applicable for a rough estimation of the effect of the filler dimensions, where the smallest of the linear dimensions was used as the scatterer diameter (for glass flakes and MGF it is thickness). We note the regular practice of such simplifications of the scatterer geometry in different ceramic and composite materials [ 33 , 34 , 35 ].…”

Section: Resultsmentioning

confidence: 99%

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Effect of Glass Filler Geometry on the Mechanical and Optical Properties of Highly Transparent Polymer Composite

et al. 2022

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In this work, we studied the influence of the geometry and degree of filling of glass dispersed particles on the optical and mechanical properties of flexible high-transmission composites, based on thermoplastic polyurethane. Glass spheres, glass flake and milling glass fiber were used as fillers. Studies of mechanical properties have shown that the introduction of any filler leads to a decrease in tensile strength and an increase in the elastic modulus of the composite material, however, with the introduction of glass flakes and milling glass fiber, a significant increase in the yield strength of the material is observed. The optical properties of composites with glass spheres decrease exponentially with an increase in the volume fraction of the filler. With an increase in the concentration of glass flakes and milling glass fiber to 10 vol.%, a sharp decrease in transmission is observed. With a further increase in concentration, the orientation of the filler along the film occurs, due to which the transmission in the visible range increases to values close to those of a pure polymer.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of Glass Filler Geometry on the Mechanical and Optical Properties of Highly Transparent Polymer Composite

et al. 2022

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“…In the literature, some iterative solutions are proposed which take a very long time to correct even a single spectrum for scattering [16][17][18][19]. A simple description for Mie scattering was proposed by Van de Hulst [20][21][22], and the scattering efficiency of a spherical particle with a constant refractive index was calculated according to:…”

Section: Particle Identificationmentioning

confidence: 99%

A Portable Infrared System for Identification of Particulate Matter

Núñez,

Boersma,

Koldeweij

et al. 2024

Sensors

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Occupational exposure to airborne dust is responsible for numerous respiratory and cardiovascular diseases. Because of these hazards, air samples are regularly collected on filters and sent for laboratory analysis to ensure compliance with regulations. Unfortunately, this approach often takes weeks to provide a result, which makes it impossible to identify dust sources or protect workers in real time. To address these challenges, we developed a system that characterizes airborne dust by its spectro-chemical profile. In this device, a micro-cyclone concentrates particles from the air and introduces them into a hollow waveguide where an infrared signature is obtained. An algorithm is then used to quantitate the composition of respirable particles by incorporating the infrared features of the most relevant chemical groups and compensating for Mie scattering. With this approach, the system can successfully differentiate mixtures of inorganic materials associated with construction sites in near-real time. The use of a free-space optic assembly improves the light throughput significantly, which enables detection limits of approximately 10 µg/m3 with a 10 minute sampling time. While respirable crystalline silica was the focus of this work, it is hoped that the flexibility of the platform will enable different aerosols to be detected in other occupational settings.

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“…The effect of light scattering on the film transmittance is dependent on the particle size compared to the incident light wavelength. Three behaviors are distinguishable: (i) for particle size lower than the wavelength, the well-known Rayleigh scattering occurs; (ii) for particle size higher than the wavelength, light diffraction prevails; and (iii) for particle size of one order of magnitude of the wavelength, the van de Hulst approximation derived from the Mie's theory would be applied [50][51][52]. According to the size of the protrusion, the light scattering would arise from a large range of defects.…”

Section: 𝑡 𝑀𝜆 𝜆 2 𝑛 𝜆 𝜆mentioning

confidence: 99%

One-Step Synthesis of TiO2/SiO2-np Nanocomposite Photocatalytic Multilayer Films: Effect of Incorporation Time Sequences of SiO2 Nanoparticles during the TiO2 Film Growth

Lai,

Aubry,

Sublemontier

et al. 2024

Materials

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In this article, the TiO2/SiO2-np nanocomposite multilayer films were synthesized in a single step by reactive magnetron sputtering combined with a nanoparticle aerosol jet. The SiO2 nanoparticles (SiO2-np) were introduced into a growing TiO2 thin film with different time sequences during deposition for a fixed duration. The SiO2-np acting as impurities are introduced into the TiO2 to willingly disturb its growth and to cause growth defects in order to increase the specific surface area of the photocatalytic film. In reason of the non-photoactive properties of the SiO2 nanoparticles, their introduction allows us to study only the effects induced on the film morphology, microstructure, and photocatalytic properties by their incorporation. The fractographies and topographies reveal strong changes in the morphologies depending on the time sequence of the nanoparticle introduction in the thin films. The introduction of SiO2-np from the beginning of the TiO2 film growth leads to the formation of high and large growth defects resulting in a highly diffusive surface. In addition, XRD analysis shows that the crystallite size tends to decrease as the composite film layer gets closer to the surface. Their photocatalytic performance is obtained by following the degradation of orange G dye under UV-visible irradiation. The photocatalytic performance is not only related to the specific surface area of the catalyst film, and the coverage of the photoactive phase on the surface, but also to the crystal quality of the photoactive phase. Furthermore, the samples exhibit good photostability, maintaining the same activity after four degradation cycles. In the specific case of TiO2/SiO2-np, it is demonstrated that the introduction of the nanoparticles only at the beginning of the film growth is more efficient than a continuous introduction. This result suggests that this original process allows the use of a relevant strategy for the nanoparticle introduction according to the required functionality.

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The van de Hulst approximation for light scattering and its use for transmittance predictions in transparent ceramics

Cited by 18 publications

References 16 publications

Effect of Glass Filler Geometry on the Mechanical and Optical Properties of Highly Transparent Polymer Composite

Effect of Glass Filler Geometry on the Mechanical and Optical Properties of Highly Transparent Polymer Composite

A Portable Infrared System for Identification of Particulate Matter

One-Step Synthesis of TiO2/SiO2-np Nanocomposite Photocatalytic Multilayer Films: Effect of Incorporation Time Sequences of SiO2 Nanoparticles during the TiO2 Film Growth

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