Depolarization of Light Scattered in Water Dispersions of Nanoparticles of Different Shapes

Dolgushin, S. A.; Yudin, I. K.; Deshabo, V. K.; Shalaev, Pavel V.; Tereshchenko, S. A.

doi:10.1007/s10527-016-9574-6

Cited by 10 publications

(6 citation statements)

References 13 publications

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“…To analyse aspheric nanoparticles, the polarimetric technique was used [2]. The scattered radiation was registered in two perpendicular polarizations, translational and rotational diffusion coefficients were calculated.…”

Section: Methodsmentioning

confidence: 99%

Modifications of laser correlation spectrometer for investigation of biological fluids

et al. 2017

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Abstract. We suggest three modifications of a laser correlation spectrometer for analysis of complex multicomponent biological solutions based on: (i) dynamic light scattering with special signal processing for analysis of polydisperse solutions, (ii) use of polarimetric technique for shape analysis, (iii) cross-correlation processing. The schemes of the devices based on polarization and cross-correlation analysis are described.

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Section: Methodsmentioning

confidence: 99%

Modifications of laser correlation spectrometer for investigation of biological fluids

et al. 2017

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“…On the contrary, in the case of PS particles, their anisotropic particle concentration c an is effectively zero compared to the corresponding total particle concentration c tot , as expected for optically isotropic particles (data not shown here), simply because the depolarized component of side-scattered light from isotropic particles is negligible. 9,10,12 The sensitivity of the PISMO to a sudden change in the population of suspended particles was tested by monitoring the mixing of PS and AuNR particle suspensions. As illustrated in Figure 2c, during the first 35 min of measurement, only PS particles were suspended at a total particle concentration c tot of 5 × 10 7 mL −1 .…”

Section: Accuracy Precision and Sensitivity Of Measurementmentioning

confidence: 99%

“…Note that the depolarized component of the scattered light is negligible when a scatterer is optically isotropic like amorphous materials, whereas the depolarized component can be significant when a scatterer is optically anisotropic like most crystals. [9][10][11][12]18 Accordingly, analyzing images of the two orthogonally polarized scattered light enables one to monitor the numbers of amorphous and of crystalline mesospecies within the observation volume of the measurement device and hence their concentrations. This article is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

“…Nanoparticle tracking analysis (NTA) − and resistive-pulse sensing ,, quantify the concentration of mesospecies, but these techniques are offline analytical methods that require cumbersome manual handling of a small volume of a solution sample and cannot distinguish between optically isotropic species (e.g., amorphous materials) and anisotropic ones (e.g., most crystals). Depolarized dynamic light scattering − can distinguish optically anisotropic mesospecies from isotropic ones, but this method is an offline characterization technique that cannot measure the concentration of mesospecies. Laser backscattering techniques (e.g., focused beam reflectance measurement , and optical reflection measurement , ) enable the online monitoring of the chord length distribution (CLD) of a crystal population in a lab-scale stirred reactor, but they are limited to micron-size crystal populations, and their application to the monitoring of crystal concentration requires a laborious calibration procedure that is based on an empirical correlation between the particle count rate and the crystal concentration …”

Section: Introductionmentioning

confidence: 99%

“…A sample in the FTC illuminated by a sheet of a vertically polarized beam scatters partially depolarized light, whose vertically polarized and horizontally depolarized components are imaged individually through synchronized image acquisition from two cameras. Note that the depolarized component of the scattered light is negligible when a scatterer is optically isotropic like amorphous materials, whereas the depolarized component can be significant when a scatterer is optically anisotropic like most crystals. − , Accordingly, analyzing images of the two orthogonally polarized scattered light enables one to monitor the numbers of amorphous and of crystalline mesospecies within the observation volume of the measurement device and hence their concentrations.…”

Section: Introductionmentioning

confidence: 99%

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Online Monitoring of the Concentrations of Amorphous and Crystalline Mesoscopic Species Present in Solution

Ahn

Chen

Mazzotti

2022

Crystal Growth & Design

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Despite the growing evidence for the existence of amorphous mesoscopic species in a solution and their crucial roles in crystallization, there has been the lack of a suitable method to measure the time-resolved concentrations of amorphous and crystalline mesospecies in a lab-scale stirred reactor. This has limited experimental investigations to understand the kinetics of amorphous and crystalline mesospecies formation in stirred solutions and made it challenging to measure the crystal nucleation rate directly. Here, we used depolarized light sheet microscopy to achieve time-resolved measurements of amorphous and crystalline mesospecies concentrations in solutions at varying temperatures. After demonstrating that the concentration measurement method is reasonably accurate, precise, and sensitive, we utilized this method to examine mesospecies formation both in a mixture of two miscible liquids and in an undersaturated solution of DL-valine, thus revealing the importance of a temperature change in the formation of metastable and amorphous mesospecies as well as the reproducibility of the measurements. Moreover, we used the presented method to monitor both mesospecies formation and crystal nucleation in DL-valine solutions at four different levels of supersaturation, while achieving the direct measurement of the crystal nucleation rates in stirred solutions. Our results show that, as expected, the inherent variability in nucleation originating from its stochastic nature reduces with increasing supersaturation, and the dependence of the measured nucleation rate on supersaturation is in reasonable agreement with that predicted by the classical nucleation theory.

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Analysis of intensity/time series obtained in homodyne evanescent wave DLS electrophoretic experiments

Savchenko

Skvortsov

Velichko

et al. 2019

J. Phys.: Conf. Ser.

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The electrophoretic motion in monodisperse and polydisperse systems of silica microspheres was studied by evanescent wave dynamic light scattering technique with homodyne detection. Instead of the attempts to calculate average autocorrelation function, the intensity temporal profile was assessed by short-time Fourier transform was followed by multivariate curve resolution. The profile contained random alternate smooth regions and oscillating regions with definite frequencies. The effect was attributed to the few number of moving particles in the narrow zone, illuminated by evanescent wave. The changes in the short-time spectrum corresponded to entry or exit of individual particles. Feasibility to evaluate the mobility of individual particles in polydisperse systems is discussed.

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Depolarization of Light Scattered in Water Dispersions of Nanoparticles of Different Shapes

Cited by 10 publications

References 13 publications

Modifications of laser correlation spectrometer for investigation of biological fluids

Modifications of laser correlation spectrometer for investigation of biological fluids

Online Monitoring of the Concentrations of Amorphous and Crystalline Mesoscopic Species Present in Solution

Analysis of intensity/time series obtained in homodyne evanescent wave DLS electrophoretic experiments

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