Characterization of nanofluids in evaporating droplets by dynamic light scattering

Wu, Wen-Tuan; Vela, David H. Panduro; Bück, Andreas; Fröba, Andreas P.

doi:10.1016/j.measurement.2023.113321

Cited by 7 publications

(5 citation statements)

References 62 publications

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“…58 Data points at T = 327.8 K, whose values may have been influenced by the minor disturbances, were indicated by dashed outlines. 42 Considering only the results obtained for the stock dispersions, the D T generally decreases as the overall size of the NR increases. One exception was observed for NRs 51/ 15.…”

Section: Resultsmentioning

confidence: 97%

“…The predicted values for D T and D R based on the Broersma model are indicated by the dashed lines. For NRs 47/13 and 51/15, D T and D R present no concentration dependence close to the infinite dilution regime . Considering only the results obtained for the stock dispersions, the D T generally decreases as the overall size of the NR increases.…”

Section: Resultsmentioning

confidence: 98%

“…56,57 The dotted lines represent the values calculated according to the stick hydrodynamic theory (StHT). 58 42 Considering only the results obtained for the stock dispersions, the D T generally decreases as the overall size of the NR increases. One exception was observed for NRs 51/ 15.…”

Section: Resultsmentioning

confidence: 99%

“…The application of polarized DLS for the determination of the D T in various particulate systems containing isotropic nanoparticles has been reported in our previous publications. − In the following, only the most essential methodological principles related to the polarized and depolarized DLS for the determination of the D T and D R will be presented.…”

Section: Experimental Sectionmentioning

confidence: 99%

See 3 more Smart Citations

Determination of Translational and Rotational Diffusivities of Anisotropic Nanoparticles by Heterodyne Polarized and Depolarized Dynamic Light Scattering

Wu,

Chittem,

Meißner

et al. 2024

J. Phys. Chem. C

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This work presents the determination of translational diffusivities D T and rotational diffusivities D R of gold nanorods and silver nanocubes using polarized and depolarized dynamic light scattering. In combination with a heterodyne detection scheme, the signal-to-noise ratio of the analyzed correlation functions is significantly improved, which reduces the uncertainties in the determined mean lifetimes of the fluctuations studied and, thus, in the diffusivities. The heterodyne detection scheme also simplifies the data evaluation when homodyne conditions cannot be realized. For nanorods with aspect ratios ranging from 3.6 to 4.8, D T and D R were determined with average expanded uncertainties of (6 and 8) %. D T and D R increase with increasing temperature. In contrast, no concentration dependence of the diffusivities could be found for particle concentrations close to infinite dilution. Based on their values and a model in the literature, the length and width of the nanorods could be determined to be in agreement with the values from electron microscopy with deviations of (12 and 16) %. In this work, it was also demonstrated that dynamic light scattering is applicable for the determination of D T and D R for nanocubes with small anisotropy, with expanded uncertainties of (1.4 and 12) %. Due to the small anisotropic contribution to the scattered light, D R could only be obtained by depolarized dynamic light scattering. The experimental D R values are smaller than those calculated theoretically by the Stokes−Einstein−Debye relation, which, however, considers the nanocubes as equivalent spheres.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

See 2 more Smart Citations

Determination of Translational and Rotational Diffusivities of Anisotropic Nanoparticles by Heterodyne Polarized and Depolarized Dynamic Light Scattering

Wu,

Chittem,

Meißner

et al. 2024

J. Phys. Chem. C

Self Cite

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“…It measures particles in the range of 0.3nm to 10 µm. Measurement of particle size is based on the mechanism of Dynamic Light Scattering (DLS) (Baig, et al, 2020;Wu et al, 2023).…”

Section: Particle Size and Pdimentioning

confidence: 99%

Formulation and Evaluation of Ocusert Embeded with Ciprofloxacin Loaded Nanoparticles

Shaikh,

Khan,

Shaikh

et al. 2024

IJALSR

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Ophthalmic drug delivery is very challenging. Upon the application of conventional topical ophthalmic formulations, a significant portion of the administered dose goes to waste due to the existence of various ophthalmic barriers. There is a swift elimination of the applied solution from the anterior part of the eyes through the nasolacrimal duct to the nasal cavity. The aim of this study was to develop an ocusert embedded with ciprofloxacin-loaded nanoparticles to increase patient compliance by improving local delivery of the drug. Ciprofloxacin-loaded Eudragit RL PO polymeric nanoparticles were prepared and evaluated for particle properties. These drug-loaded polymeric nanoparticles were embedded in an ocusert made of carboxymethylcellulose. Various properties of ocuserts, like film endurance, surface pH, disintegration time, and sterility, were studied. A drug-loaded nanoparticle-embedded ocusert was found to be a suitable system to improve ophthalmic drug delivery. The nanoparticles' particle size, polydispersity index (PDI), entrapment efficiency, and in vitro drug release were all assessed. The generated ocuserts underwent screening for sterility, drug content, weight variability, folding durability, thickness, surface pH, and disintegration time. In order to gain insight into the process by which drugs release from the formulations, the in vitro drug release from the preparations was examined using a standard Abron Visking semipermeable membrane.

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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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Characterization of nanofluids in evaporating droplets by dynamic light scattering

Cited by 7 publications

References 62 publications

Determination of Translational and Rotational Diffusivities of Anisotropic Nanoparticles by Heterodyne Polarized and Depolarized Dynamic Light Scattering

Determination of Translational and Rotational Diffusivities of Anisotropic Nanoparticles by Heterodyne Polarized and Depolarized Dynamic Light Scattering

Formulation and Evaluation of Ocusert Embeded with Ciprofloxacin Loaded Nanoparticles

Dynamic Light Scattering for the Measurement of Transport Properties of Fluids

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