4.10 Photon Density Wave (
            <scp>PDW</scp>
            ) Spectroscopy for Nano‐ and Microparticle Sizing

Bressel, Lena; Hass, Roland

doi:10.1002/9783527823048.ch4-10

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…Qualitative information on the typical behavior of

\mu _{\mathrm{s}}^{\prime}( d )

is discussed in Sections 3.1 and 3.8. It should also be noted that equations to calculate

\mu _{\mathrm{s}}^{\prime}

for polydisperse scatterers and dependent scattering are available 31 …”

Section: Methodsmentioning

confidence: 99%

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Effect of alkali metal salt addition on disintegration of titania particles precipitated from tetraethyl orthotitanate in ethanol

Zimmermann,

Koenig,

Reich

et al. 2024

Int J Ceramic Engine & Sci

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Inline (or in situ) photon density wave spectroscopy was used to monitor the disintegration of secondary titania particles into their primary particles. Photon density wave spectroscopy can be applied to determine the reduced scattering coefficient of a dispersion without dilution or calibration, and thus enables process analysis in materials that are usually unsuitable for established particle characterization techniques. In this work, amorphous titania particles were precipitated from tetraethyl orthotitanate in ethanol by addition of water in presence of different alkali metal salts (NaCl, KCl, CsCl, K2SO4) with concentrations between 0 and 1.6 mM. The present results suggest that the synthesized titania secondary particles disintegrate into their primary particles if the electrostatic repulsion between the primary particles is promoted. This can be achieved by an increased alkali chloride concentration in the synthesis or by addition of larger alkali metal ions. In contrast, the particles are only weakly charged upon addition of sulfate ions, and the disintegration stops. The conclusions drawn from photon density wave spectroscopy results are supported by gravimetric determination of the particle yield, dynamic light scattering measurements, zeta‐potential measurements, and electron micrographs. Additionally, the disintegration was driven to completion by addition of hydrochloric acid to create a transparent suspension of titania primary particles as small as 4.7 nm.

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“…Qualitative information on the typical behavior of

\mu _{\mathrm{s}}^{\prime}( d )

is discussed in Sections 3.1 and 3.8. It should also be noted that equations to calculate

\mu _{\mathrm{s}}^{\prime}

for polydisperse scatterers and dependent scattering are available 31 …”

Section: Methodsmentioning

confidence: 99%

“…It should also be noted that equations to calculate 𝜇 ′ s for polydisperse scatterers and dependent scattering are available. 31 The spectrometer used in this work was built at University of Potsdam, Germany. Its detailed technical description can be found elsewhere.…”

Section: Photon Density Wave Spectroscopymentioning

confidence: 99%

Effect of alkali metal salt addition on disintegration of titania particles precipitated from tetraethyl orthotitanate in ethanol

Zimmermann,

Koenig,

Reich

et al. 2024

Int J Ceramic Engine & Sci

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Real‐Time Monitoring of Particle Size in Emulsion Polymerization: Simultaneous Turbidity and Photon Density Wave Spectroscopy

Aspiazu,

Gómez,

Paulis

et al. 2024

Macromol. Rapid Commun.

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Particle size evolution in seeded semibatch emulsion polymerization is monitored by two real‐time monitoring techniques: online turbidity spectroscopy (TUS) and inline photon density wave spectroscopy (PDWS). An automatic dilution system that withdraws a sample from the reactor and upon dilution transfers to the measurement cell is used for the online TUS analysis. A PDWS probe is immersed in the reactor and collects inline the scattered light directly from the reacting latex. The particle sizes retrieved from TUS and PDWS are compared to offline dynamic light scattering (DLS) values. The particle size obtained by TUS is close to the intensity‐average particle size obtained offline by DLS, while the particle size obtained by PDWS lies closer to the number‐average particle size from DLS.

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Bioprozessanalytik: Sondieren, wie der Prozess läuft

Gutschmann¹,

Münzberg²,

Riedel³

2023

Nachr Chem

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4.10 Photon Density Wave ( PDW ) Spectroscopy for Nano‐ and Microparticle Sizing

Cited by 3 publications

References 14 publications

Effect of alkali metal salt addition on disintegration of titania particles precipitated from tetraethyl orthotitanate in ethanol

Effect of alkali metal salt addition on disintegration of titania particles precipitated from tetraethyl orthotitanate in ethanol

Real‐Time Monitoring of Particle Size in Emulsion Polymerization: Simultaneous Turbidity and Photon Density Wave Spectroscopy

Bioprozessanalytik: Sondieren, wie der Prozess läuft

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