Investigation of FeCl3 induced coagulation processes using electrophoretic measurement, nanoparticle tracking analysis and dynamic light scattering: Importance of pH and colloid surface charge

2014 ◽  
Vol 461 ◽  
pp. 212-219 ◽  
Author(s):  
Olena Oriekhova ◽  
Serge Stoll
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Surface Charge ◽  
Nanoparticle Tracking Analysis ◽  
Electrophoretic Measurement

scholarly journals Nanoparticle Tracking Analysis of Latex Standardized Beads

2015 ◽  
Vol 37 (1) ◽  
pp. 49-53 ◽  
Author(s):  
Tomasz Śliwa ◽  
Maciej Jarzębski ◽  
Kosma Szutkowski
Keyword(s):  
Particle Size ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Nanoparticle Tracking Analysis ◽  
Post Processing ◽  
Particle Movement ◽  
Negative Effects ◽  
Advanced Method ◽  
Size Characterization ◽  
Particle Size Characterization

The most popular technique for particle size characterization is the dynamic light scattering (DLS). In recent years new advanced method based on counting each single particle movement was introduced giving perspective for measurement of each component of mixture. This study presents some advantages of nanoparticle tracking analysis (NTA) method in comparison to DLS. For tests standard polystyrene beds were chosen vary diameter of 22, 61 and 150 nm and its mixtures. Experiments showed that the particles size resolution allows to distinguish each population in two population suspension opposed to DLS. The NTA method permits to eliminate the negative effects i.e. dust or aggregates in sample during post processing, that permits to use it in a variety of studies.

scholarly journals Study of colloidal dispersions of gold nanorods using light scattering methods

2020 ◽  
Vol 23 (2) ◽  
pp. 116-126
Author(s):  
P. V. Shalaev ◽  
P. A. Monakhova ◽  
S. A. Tereshchenko
Keyword(s):  
Electron Microscopy ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Gold Nanorods ◽  
Colloidal Gold ◽  
Colloidal Dispersions ◽  
Nanoparticle Tracking Analysis ◽  
Analysis Methods ◽  
Measurement Results

Five samples of colloidal dispersions of gold nanorods with various aspect ratio were studied using methods based on light scattering. Transmission electron microscopy was used as a reference method. The advantages and disadvantages of the dynamic light scattering and nanoparticle tracking analysis methods for determination of the geometric parameters of nanoparticles, their concentration, monodispersity, as well as for detection of large aggregates and quasispherical impurities were given. It was shown that the method of depolarized dynamic light scattering can be used for determination of the geometric parameters of liquid dispersions of colloidal gold nanorods. Moreover, it was found that the presence of large impurities or particle aggregates in the sample strongly affects the measurement results. The presence of large particles in the dispersion can be determined using dynamic light scattering or nanoparticle tracking analysis methods. The method of dynamic light scattering was also found to be more sensitive to the presence of even a small amount of large impurities or aggregates in the sample. The monodispersity of a liquid dispersion of nanorods can also be estimated by dynamic light scattering and nanoparticle tracking analysis methods, and, comparing to electron microscopy, the measurement results can be considered more statistically reliable due to the analysis of a larger number of particles. It was found that the increase of spherical particles concentration in the composite dispersion of nanospheres and nanorods leads to a decrease in the contribution of the rotational mode in the total scattering intensity. In addition, the concentration of quasispherical impurities in samples of liquid dispersions of colloidal gold nanorods was calculated based on measurements of the depolarization degree of scattered light.

scholarly journals Study of colloidal gold nanorods in liquid dispersions using light scattering methods

2021 ◽  
Vol 7 (2) ◽  
pp. 53-61
Author(s):  
Pavel V. Shalaev ◽  
Polina A. Monakhova ◽  
Sergey A. Tereshchenko
Keyword(s):  
Electron Microscopy ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Gold Nanorods ◽  
Colloidal Gold ◽  
Geometrical Parameters ◽  
Scattering Method ◽  
Nanoparticle Tracking Analysis ◽  
Dynamic Light Scattering Method ◽  
Measurement Results

Five samples of liquid dispersions of colloidal gold nanorods having various aspect ratios have been studied using light scattering methods. Transmission electron microscopy has been employed as a reference method. Advantages and drawbacks of dynamic light scattering and nanoparticle tracking analysis methods for study of nanoparticle geometrical parameters and concentration, sample monodispersity degree and detection of large particle aggregations and quasispherical impurities have been demonstrated. We show that depolarized dynamic light scattering method can be used for analysis of geometrical parameters of colloidal gold nanorods in liquid dispersions. The measurement results depend largely on the presence of large impurity particles or particle aggregations in samples. In turn the presence of large particles in dispersions can be detected using dynamic light scattering methods or nanoparticle tracking analysis. Dynamic light scattering method is more sensitive to the presence of even small quantities of large impurities or aggregations in samples. The monodispersity degree of nanorod liquid dispersions can also be assessed using dynamic light scattering and nanoparticle tracking analysis methods, and the measurement results can be considered more statistically significant in comparison with electron microscopy because a larger number of particles are analyzed. An increase in the concentration of spherical particles in compound dispersions of colloidal gold nanospheres and nanorods leads to a decrease in the contribution of the rotational mode to the overall scattering intensity. Data on the concentration of quasispherical impurities in samples of colloidal gold nanorod liquid dispersions have been reported on the basis of scattered light depolarization degree measurements.

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