scholarly journals Investigations of the Kinetics of Cluster Growth in Fullerene C60 Solutions

2020 ◽  
Vol 65 (8) ◽  
pp. 701 ◽  
Author(s):  
T. V. Tropin ◽  
N. Jargalan ◽  
M. V. Avdeev ◽  
V. L. Aksenov
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Fullerene C60 ◽  
General Character ◽  
Cluster Growth ◽  
Complicated Structure ◽  
Aggregation Mechanism ◽  
Different Types ◽  
Kinetics Of

Fullerenes tend to form clusters in different solutions. In this work, a brief survey and some results in the field of investigations of the structure and kinetics of clusters growing in C60 solutions are presented. The general character of this phenomenon for fullerenes is emphasized, and the considerations of mechanisms responsible for the formation and growth of clusters are discussed. We distinguish different types of fullerene solvents by the aggregation mechanism. The kinetics of cluster growth measured via the dynamic light scattering is presented. The complicated structure of clusters in different solutions is briefly discussed.

Study of stabilization of self-assembly processes in fullerene C60 solution

2021 ◽  
Vol 23 (3) ◽  
pp. 12-14
Author(s):  
U.K. Makhmanov ◽  
A.M. Kokhkharov ◽  
Sh.A. Esanov ◽  
B.A. Aslonov ◽  
B.A. Sindarov ◽  
...  
Keyword(s):  
Refractive Index ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Molecular Interactions ◽  
Self Assembly ◽  
Fullerene C60 ◽  
Self Organization ◽  
Final Size ◽  
Initial Concentration ◽  
Xylene Solution

The dynamics of changes in the values of the refractive index of solutions of C60 in xylene at various concentrations has been studied by the refractometric method. It was found that the deviation from the linear form of the dependence of the refractive index on the C60 concentration occurs at a C60 concentration of 1.8 mg/ml. The deviation is associated with the largest number of molecular interactions between C60−C60 and the formation of large nanoclusters on their basis in solution. It was found by the dynamic light scattering (DLS) that the final size of C60 nanoclusters in solution depends on the initial concentration of the solute. A higher initial concentration of C60 leads to the synthesis of nanoclusters with a larger diameter. Using the method of optical spectroscopy, the processes of self-organization of fullerene C60 molecules in a xylene solution in time are studied. The character of stability of synthesized fullerene nanoclusters in solution is discussed. The results obtained are of particular importance for numerous applications of nanotechnology for understanding self-assembly processes and the development of new nanomaterials.

scholarly journals Characteristics and Kinetics of Phosphorus Release from Formulated Fertilizer in Clay Loam Soil

KIMIKA ◽  
2019 ◽  
Vol 30 (2) ◽  
pp. 1-4
Author(s):  
Vernadette J. Soriano ◽  
Veronica P. Migo ◽  
Monet Concepcion Maguyon-Detras ◽  
Catalino G. Alfafara
Keyword(s):  
Light Scattering ◽  
Kinetic Model ◽  
Dynamic Light Scattering ◽  
Release Kinetics ◽  
Phosphorus Release ◽  
Particle Dynamic ◽  
Clay Loam ◽  
Clay Loam Soil ◽  
Loam Soil ◽  
Kinetics Of

A kinetic study for the phosphorus release of a formulated CaHAP-Z fertilizer was done to observe its behavior when applied to clay loam soil. The study of release kinetics of CaHAP-Z was done along with CaHAP and the control fertilizer Solophos™ to determine whether the formulated fertilizer can be an alternative for the conventional fertilizer. Results showed that the formulated fertilizer CAHAP-Z contains 3.73% phosphorus with 513.10 nm particle (Dynamic Light Scattering) indicating that the formulated fertilizer can be classified as a nanofertilizer. The formulated CaHAP-Z fertilizer showed the slowest release kinetics compared to the controls. In addition, this study showed that the simple Elovich kinetic model is the general equation that best fits to describe the phosphorus release of fertilizers.

scholarly journals Kinetic Study of Peroxidase-Catalyzed Oxidation of 2-Hydroxyanthracene and 9-Phenanthrol in Presence of Biosurfactant Escin

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 591
Author(s):  
Rūta Ivanec-Goranina
Keyword(s):  
Light Scattering ◽  
Critical Micelle Concentration ◽  
Dynamic Light Scattering ◽  
Kinetic Measurements ◽  
Scattering Technique ◽  
Dynamic Light Scattering Technique ◽  
Kinetics Of ◽  
Catalyzed Oxidation ◽  
Environmentally Friendly Method ◽  
Light Scattering Technique

The kinetics of fungal peroxidase-catalyzed 2-hydroxyanthracene and 9-phenanthrol oxidation was investigated in presence of biosurfactant escin at pH 5.5 and 25 °C. The kinetic measurements were performed using the fluorimetric method and the critical micelle concentration (CMC) of escin was determined using the dynamic light scattering technique. Inactivation of peroxidase was observed in absence of biosurfactant escin. It was shown that escin, used in concentrations lower than CMC, decreases or completely stops the peroxidase inactivation and increases the conversion of 2-hydroxyanthracene as well as of 9-phenanthrol. The environmentally friendly method of peroxidase-catalyzed 2-hydroxyanthracene and 9-phenanthrol oxidation in presence of biosurfactant Escin has an advantage over traditional decontamination methods due to their less environmental impact.

Aggregation kinetics of OX50 hydrosols in NaCl solutions studied by dynamic light scattering

2016 ◽  
Vol 78 (5) ◽  
pp. 623-632 ◽  
Author(s):  
L. M. Molodkina ◽  
E. V. Golikova ◽  
R. S. Bareeva ◽  
A. N. Chusov ◽  
N. F. Bogdanova
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Aggregation Kinetics ◽  
Kinetics Of

scholarly journals Molecular solubilization of fullerene C60 in water by γ-cyclodextrin thioethers

2012 ◽  
Vol 8 ◽  
pp. 1644-1651 ◽  
Author(s):  
Hai Ming Wang ◽  
Gerhard Wenz
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Equilibrium State ◽  
Solubility Diagram ◽  
Fullerene C60 ◽  
Phase Solubility ◽  
Particle Sizes ◽  
Organic Cosolvents ◽  
Phase Solubility Diagram

Various hydrophilic γ-cyclodextrin (CD) thioethers, containing neutral or ionic side arms were found to form molecular disperse solutions of C60 in water reaching concentrations of 15 mg/L. Equilibrium state was approached after seven days without the use of organic cosolvents. The 1:2 stoichiometry of the C60/γ-CD thioether complexes was demonstrated by a parabolic phase-solubility diagram. In contrast, native γ-CD forms nanoparticles with C60. Particle sizes of C60 were determined by dynamic light scattering.

Fractal Concepts And Aggregation Of Iron Oxides

1990 ◽  
Vol 180 ◽  
Author(s):  
R. Amal ◽  
J.A. Raper ◽  
T.D. Waite
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Iron Oxides ◽  
Aggregate Size ◽  
Fractal Dimensions ◽  
Aggregation Kinetics ◽  
Diffusion Limited ◽  
Scattering Measurements ◽  
The Relationship ◽  
Kinetics Of

ABSTRACTThe modelling of the aggregation kinetics of iron oxides has been succesful in predicting the increase in aggregate size as determined by dynamic light scattering measurements. The aggregates were found to exhibit fractal behaviour with fractal dimensions obtained from the scattering exponent in static light scattering studies dependent on the aggregation mechanism and ranging from 2.3 for rapid (diffusion limited) to 2.8 for slow (reaction limited) aggregation. Polydispersity and restructuring of aggregates were found not to affect the relationship between scattering exponent and aggregate fractal dimension. Excellent correspondence over a range of temperatures and ionic strengths has been obtained between results of sizing experiments using dynamic light scattering and sizes predicted using a modified Smoluchowski model incorporating fractal dimensions.

Kinetics of coagulation by dynamic light scattering

1983 ◽  
Vol 79 (8) ◽  
pp. 4006-4009 ◽  
Author(s):  
H. Versmold ◽  
W. Härtl
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Kinetics Of

Comparison of the Long-Term Stability of TiO2 Hydrosols with Different Concentration of Nanoparticles

2012 ◽  
Vol 77 ◽  
pp. 53-58 ◽  
Author(s):  
Olga Pavlova-Verevkina ◽  
Natalia Golubko ◽  
Alexander Sumbatov ◽  
Ludmila Ozerina
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Tio2 Nanoparticles ◽  
Hydrodynamic Radius ◽  
Slow Growth ◽  
Term Stability ◽  
Long Term Stability ◽  
The Mean ◽  
Kinetics Of

The long-term stability of two TiO2 hydrosols with concentration of TiO2 nanoparticles 1 and 12 mass.% was compared by turbidimetry and dynamic light scattering. The both sols were stabilized by HCl at pH=0.5. It was found that the mean hydrodynamic radius of particles and the turbidity of the sols increased slowly for six months of investigation and the kinetics of the “ageing” of the sols did not depend on TiO2 concentration. The obtained results will enable to determine mechanisms of the slow growth of nanoparticles and to modify nanoparticles structure.

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