Development of a Precise and in Situ Turbidity Measurement System

Ren, Kun; Xu, Feng; Cai, Xiaoshu; Dorey, Jean-Marc

doi:10.1080/00986440902938865

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…However, electron microscope measurement is costly, time-consuming, and cannot achieve real-time monitoring, nor it is possible to determine the concentration of nanoparticles [ 15 ]. Among many size measurement methods, the spectral extinction method has attracted significant attention by its relative simplicity and its ability to obtain the size and the concentration of the nanoparticles simultaneously [ 16 ]. Khlebtsov et al [ 17 , 18 ] retrieved the aspect ratio distribution of nanorods by fitting their extinction spectrum and depolarizing scattering spectrum.…”

Section: Introductionmentioning

confidence: 99%

Retrieval of Size Distribution and Concentration of Au-Ag Alloy Nanospheroids by Spectral Extinction Method

et al. 2022

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In order to monitor the synthesis processes or characterize nanoparticles for application, a new method that allows in situ determination of the two-dimensional size distribution and concentration of Au-Ag alloy nanospheroids, based on their extinction spectrum, is developed. Non-negative Tikhonov regularization and T-matrix method were used to solve the inverse problem. The effects of the two-dimensional size steps, wavelength range, and measurement errors of extinction spectrum on the retrieval results were analyzed to verify the feasibility and accuracy of the retrieval algorithm. Through comparative analysis, the size steps and wavelength range that make the retrieval error smaller are found. After adding 0.1% random noise to the extinction spectrum, a small variation in the retrieval error of the mean size is observed. The results showed that the error of the mean size is smaller than 2% and the error of the concentration is smaller than 3%. This method is simple, fast, cheap, nondestructive, and can be done in situ during the growth process of nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Retrieval of Size Distribution and Concentration of Au-Ag Alloy Nanospheroids by Spectral Extinction Method

et al. 2022

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“…Regularization may be nonconstrained or constrained. Nonconstrained regularization procedures search for solutions, which minimize the deviation from some a priori assumed characteristics, such as smoothness (solution vector norm or its derivatives are minimized), while maximizing the fit to the measured data [5,6]. Whereas constrained regularization methods impose additionally some (usually physical) constraints on the solution, which need to be satisfied rigorously.…”

Section: Introductionmentioning

confidence: 99%

Improved inversion procedure for particle size distribution determination by photon correlation spectroscopy

et al. 2012

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We propose a minimum variation of solution method to determine the optimal regularization parameter for singular value decomposition for obtaining the initial distribution for a Chahine iterative algorithm used to determine the particle size distribution from photon correlation spectroscopy data. We impose a nonnegativity constraint to make the initial distribution more realistic. The minimum variation of solution is a single constraint method and we show that a better regularization parameter may be obtained by increasing the discrimination between adjacent values. We developed the S-R curve method as a means of determining the modest iterative solution from the Chahine algorithm. The S-R curve method requires a smoothing operator. We have used simulated data to verify our new method and applied it to real data. Both simulated and experimental data show that the method works well and that the first derivative smoothing operator in the S-R curve gives the best results.

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Examination of wavelength dependent soot optical properties of diesel and diesel/rapeseed methyl ester mixture by extinction spectra analysis and LII measurements

Yon¹,

Lemaire²,

Therssen³

et al. 2011

Appl. Phys. B

110

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Development of a Precise and in Situ Turbidity Measurement System

Cited by 7 publications

References 6 publications

Retrieval of Size Distribution and Concentration of Au-Ag Alloy Nanospheroids by Spectral Extinction Method

Retrieval of Size Distribution and Concentration of Au-Ag Alloy Nanospheroids by Spectral Extinction Method

Improved inversion procedure for particle size distribution determination by photon correlation spectroscopy

Examination of wavelength dependent soot optical properties of diesel and diesel/rapeseed methyl ester mixture by extinction spectra analysis and LII measurements

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