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

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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Study of colloidal dispersions of gold nanorods using light scattering methods

Izvestiya Vysshikh Uchebnykh Zavedenii Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering ◽

10.17073/1609-3577-2020-2-116-126 ◽

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.

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Thermal Diffusivity Measurement of Trans-1-chloro-3,3,3-trifluoropropene (R1233zd(E)) and Dodecafluoro-2-methylpentan-3-one (Novec1230) by the Dynamic Light Scattering Method

Journal of Chemical & Engineering Data ◽

10.1021/acs.jced.0c00221 ◽

2020 ◽

Vol 65 (9) ◽

pp. 4236-4241

Author(s):

Xuyao Tang ◽

Yang Wang ◽

Junwei Cui ◽

Xiaozhen Hu ◽

Shengshan Bi ◽

...

Keyword(s):

Thermal Diffusivity ◽

Light Scattering ◽

Dynamic Light Scattering ◽

Scattering Method ◽

Thermal Diffusivity Measurement ◽

Dynamic Light Scattering Method ◽

Diffusivity Measurement

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Using the dynamic light-scattering method for the analysis of a blood-serum model solution

Moscow University Physics Bulletin ◽

10.3103/s0027134912050104 ◽

2012 ◽

Vol 67 (5) ◽

pp. 452-456 ◽

Cited By ~ 3

Author(s):

I. M. Papok ◽

G. P. Petrova ◽

K. A. Anenkova ◽

E. A. Papish

Keyword(s):

Light Scattering ◽

Dynamic Light Scattering ◽

Blood Serum ◽

Model Solution ◽

Scattering Method ◽

Dynamic Light Scattering Method

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PECULARITIES OF MICELLE FORMATION OF PENTACYCLIC GLYCOSIDES IN AQUEOUS SOLUTIONS

IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA ◽

10.6060/ivkkt.20216404.6347 ◽

2021 ◽

Vol 64 (4) ◽

pp. 26-33

Author(s):

Natalia V. Mironenko ◽

Irina V. Shkutina ◽

Vladimir F. Selemenev

Keyword(s):

Surface Tension ◽

Light Scattering ◽

Dynamic Light Scattering ◽

Aqueous Solutions ◽

Hydrodynamic Radius ◽

Critical Concentration ◽

Micelle Formation ◽

Cylindrical Shape ◽

Scattering Method ◽

Dynamic Light Scattering Method

The regularities of changes in structural characteristics during the formation of associates in micellar aqueous solutions of triterpene saponins Quillaja Saponin and Sapindus Mukorossi are considered. The dependence of surface tension and adsorption on the concentration of an aqueous saponin solution is analyzed, and the values of surface activity and parameters of the adsorption layer are calculated. The average values of diffusion coefficients for spherical and cylindrical micelles are determined based on the measurement of the solution viscosity. The effect of the electrolyte solution on the surface tension and viscosity of glycoside solutions is studied: when the electrolyte is introduced into the saponin solution, the surface tension decreases, which leads to a shift in the critical concentration of micelle formation towards lower concentrations. The introduction of potassium chloride electrolyte reduces the degree of ionization and, as a result of suppressing the electroviscosity effect, leads to a decrease in the viscosity of the solution. The dynamic light scattering method is used to determine the size of glycoside aggregates. It is established that there are aggregates of several sizes in an aqueous solution of saponin. The size and shape of aggregates were calculated using the concepts of micelle packing parameters. In the region of very low concentrations of glycoside solutions, when approaching the critical concentration of micelle formation in the solution, there are spherical micelles. A further increase in the saponin concentration in the solution leads to a decrease in the content of structures with a hydrodynamic radius of 50-80 nm and the appearance of larger agglomerates with sizes greater than 100 nm. It was found that micelles acquire a less hydrated and more densely packed cylindrical shape in the concentration range of 1.7-2.6 mmol/dm3. Compaction of associates leads to an increase in the content of particles with a hydrodynamic radius of 150-250 nm and larger ones, and their presence predicts the appearance of larger agglomerates. Analyzing the data obtained using the dynamic light scattering method, it can be concluded that aggregates of several sizes co-exist in the volume of aqueous saponin solutions at certain concentrations.

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