Dynamic Light Scattering for Studying Mutual Diffusion Coefficients in Electrolyte Systems Comprised Entirely of Ions

Piszko, Maximilian; Kankanamge, Chathura J.; Rausch, Michael H.; Klein, Tobias; Fröba, Andreas P.

doi:10.1149/1945-7111/abb97d

Cited by 8 publications

(5 citation statements)

References 90 publications

(121 reference statements)

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“…Noting that the SRS effect is proportional to the intensity of the pump field, the present methodology employs the standing wave induced by the interference of the two pump beams. The sinusoidal spatial modulation of the intensity of the standing wave allows access to the spatial Fourier component of the imaginary part of the nonlinear susceptibility of the SRS effect (Equation (35)). Here, the difference between the wavevectors of the two pump beams corresponds to the scattering vector in DLS.…”

Section: Discussionmentioning

confidence: 99%

“…The two-body interparticle potential is determined based on the theory and dependences on the volume fraction, ionic strength, and temperature. Another example is ionic particles 1 and ionic liquids, 35 which interact with each other due to Coulomb forces. The observed time constant of the autocorrelation function is dependent on q.…”

Section: Discussionmentioning

confidence: 99%

“…As in the conventional DLS, let us take the autocorrelation of Equation (35). When the system is stationary, the autocorrelation does not depend on absolute time but the lag of the autocorrelation, and thus,…”

Section: Mesoscale Structural Analysis Based On Stimulated Raman Effectmentioning

confidence: 99%

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Theoretical description for nonlinear dynamic light scattering based on stimulated Raman effect (NLDLS‐SRS)

Seto

Kobayashi

Tokunaga

2023

J Raman Spectroscopy

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Dynamic light scattering (DLS) is a method to analyze the diffusion constant and mesostructure of colloidal systems based on refractive index fluctuations. For example, DLS evaluates particle size distribution, particle drift velocity, and the typical length of the cooperative diffusion in gels. However, DLS inherently lacks chemical sensitivity since it detects the spatial Fourier component of the refractive index at the scattering vector (q). This work theoretically demonstrates the feasibility of nonlinear dynamic light scattering (NLDLS) of stimulated Raman effect that reflects molecular vibration. Specifically, we show that by interfering with two pump beams (in the pump‐probe method terminology), it is possible to extract the spatial Fourier component of the imaginary part of the third‐order nonlinear susceptibility. Here, the phase modulation of either of the two beams is effective for mode‐selective detection of the Fourier component. The difference in the wavevectors of these beams corresponds to q in DLS. The result is the same as DLS in mesostructural sensitivity but has a molecular vibration selectivity. The proposed assay in the present paper enables qualitative and chemical‐structure analysis of the colloidal systems without labeling and size differentiation in a mesopic regime.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Theoretical description for nonlinear dynamic light scattering based on stimulated Raman effect (NLDLS‐SRS)

Seto

Kobayashi

Tokunaga

2023

J Raman Spectroscopy

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“…The formation of mandelate micelles was investigated by DLS using an experimental setup as described by Piszko et al . Here, the samples with ( R , S )-mandelate concentrations of 0.5, 2, 5, and 10 mM in diisopropyl ether were filled in glass cuvettes.…”

Section: Methodsmentioning

confidence: 99%

“…The quality of the vesicles was controlled by DLS using a Zetasizer NS (Malvern, Worcestershire, UK) as reported elsewhere. 28 The formation of mandelate micelles was investigated by DLS using an experimental setup as described by Piszko et al 31 Here, the samples with (R,S)-mandelate concentrations of 0.5, 2, 5, and 10 mM in diisopropyl ether were filled in glass cuvettes. Diisopropyl ether was filtered to reduce the influence of possible particles.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Three Steps, Two Enzymes, One Pot, but a Multitude of Nanocompartments: Combined Cycles of Kinetic Resolutions and Re-racemization with Incompatible Biocatalysts

et al. 2021

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Deracemizations are clearly preferable to kinetic resolutions in the production of chiral molecules from racemates, as they allow up to 100% chemical and optical yield. Here we present a new process route for multienzymatic deracemizations that is relevant for reaction systems with incompatible reaction conditions of the biocatalysts. This often applies to combinations of lipases used for stereoselective acylation and solvent-sensitive racemases. By encapsulating a model racemase in polymeric vesicles, it was protected from inactivation by the organic solvent up to phase proportions of 99%. As high yields in the lipase reaction required either water proportions well below 1% or racemase-denaturating acyl donor concentrations, a one-pot reaction was implemented through the sequential use of lipase and racemase-containing nanocompartments. This strategy allowed us to perform two kinetic resolutions with intermittent re-racemization in one pot yielding 72% (0.72 mM after 120 h) of an enantiopure product.

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Dynamic Light Scattering for the Measurement of Transport Properties of Fluids

Koller,

Rausch,

Fröba

2024

Int J Thermophys

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The present article summarizes experimental and theoretical considerations required for a proper use of dynamic light scattering (DLS) for the measurement of transport properties of fluids. It addresses not only recent advancements of the method, but also aims to provide recommendations to researchers who intend to apply the technique in the future. As outlined in this study, DLS is based on the analysis of scattered light governed by microscopic statistical or periodic fluctuations that originate from the thermal movement of molecules and/or particles at macroscopic thermodynamic equilibrium. The dynamics of these hydrodynamic fluctuations in the bulk of fluids or at their phase boundaries are related to the underlying diffusive processes and, thus, to the associated transport properties, and are reflected by the time-dependent correlation function of the scattered light intensity. The fundamentals of this type of detection, known as photon correlation spectroscopy (PCS), will be discussed in the present contribution in some more detail. It is emphasized that the experiments need to be designed carefully in accordance with theory in order to assign the measurement signals to the corresponding hydrodynamic fluctuations. If the necessary conditions are fulfilled, DLS allows the accurate determination of several transport properties including kinematic and dynamic viscosity, thermal diffusivity, mutual diffusivity, and sound attenuation, which may be accessed together with other thermophysical properties such as speed of sound and surface or interfacial tension. In some instances, also the simultaneous determination of several transport properties is possible. With the exception of the sound attenuation, expanded uncertainties for the mentioned transport properties down to 1 % can be achieved for various types of fluid systems over a wide range of thermodynamic states up to elevated temperatures and pressures as well as in the vicinity of critical points. This performance and versatility of the DLS technique is documented in the present study by highlighting measurement examples from recent thermophysical property research on different classes of working fluids relevant for process and energy technology.

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Dynamic Light Scattering for Studying Mutual Diffusion Coefficients in Electrolyte Systems Comprised Entirely of Ions

Cited by 8 publications

References 90 publications

Theoretical description for nonlinear dynamic light scattering based on stimulated Raman effect (NLDLS‐SRS)

Theoretical description for nonlinear dynamic light scattering based on stimulated Raman effect (NLDLS‐SRS)

Three Steps, Two Enzymes, One Pot, but a Multitude of Nanocompartments: Combined Cycles of Kinetic Resolutions and Re-racemization with Incompatible Biocatalysts

Dynamic Light Scattering for the Measurement of Transport Properties of Fluids

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