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Simulation and control of nanoparticle size distribution in a high temperature reactor

100%
Sadiku-Agboola O., Kolesnikov A., Sadiku E.
Polish Journal of Chemical Technology
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2012
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vol. 14
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issue 1
5-13
EN
This work focuses on the modeling, simulation and control of particle size distribution (PSD) during nanoparticle growth with the simultaneous chemical reaction, nucleation, condensation, coagulation and convective transport in a high temperature reactor. Firstly, a model known as population balance model was derived. This model describes the formation of particles via nucleation and growth. Mass and energy balances in the reactor were presented in order to study the effect of particle size distribution for each reaction mechanisms on the reactor dynamics, as well as the evolution of the concentrations of species and temperature of the continuous phase. The models were simulated to see whether the reduced population balance can be used to control the particle size distribution in the high temperature reactor. The simulation results from the above model demonstrated that the reduced population balance can be effectively used to control the PSD. The proposed method "which is the application of reduced population balance model" shows that there is some dependence of the average particle diameter on the wall temperature and the model can thus be used as a basis to synthesize a feedback controller where the manipulated variable is the wall temperature of the reactor and the control variable is the average particle diameter at the outlet of the reactor. The influence of disturbances on the average particle diameter was investigated and controlled to its new desired set point which is 1400nm using the proportional-integral-derivative controllers (PID controllers). The proposed model was used to control nanoparticle size distribution at the outlet of the reactor.
2
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Studies on stability of emulsions containing carotenoids

100%
Igielska-Kalwat J.
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2018
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vol. 65
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issue 3
455-463
EN
Emulsions are commonly used to improve aesthetics but they may also be applied to deliver active ingredients. Recently, a group of pigments known as carotenoids has been added to emulsions as an active compound mainly due to their antioxidant properties. The stability of these formulations is a critical parameter for both, pharmaceutical and cosmetics industry. Therefore, in this study two analytical methods, multiple light scattering and laser diffraction, were tested to determine the stability of various emulsions containing carotenoids (β-carotene, lycopene, astaxanthin). Even small changes in stability of emulsions were determined very early. The results of both methods proved that the type of carotenoid used did not influence the emulsions' stability. The stability of emulsions depends mainly on the preparation methods and on the type of emulsifier applied.
3
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The Analysis of Coal Fines Separation Precision Exposed to Changeable Hydrodynamic Parameters of Jig Work

75%
Surowiak A.
Archives of Mining Sciences
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2018
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vol. 63
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issue 2
4
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Investigation and Evaluation of Jigging Separation Features

75%
Surowiak A., Surowiak A.
Archives of Mining Sciences
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2018
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vol. 63
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issue 4
5
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Evaluation of fine coal upgrading effects by means of Fuerstenau curves

75%
Surowiak A.
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vol. 35
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issue 1
6
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The morphological and dispersive characterization of commercial titanium dioxides

75%
Jesionowski T., Siwińska-Stefańska K., Krysztafkiewicz A., Sójka-Ledakowicz J., Koprowska J., Lewartowska J.
Polish Journal of Chemical Technology
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2007
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vol. 9
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issue 4
28-35
EN
The physicochemical and dispersive characterizations were conducted on the selected commercial titanium dioxides produced by, Z. Ch. POLICE, S. A. The dispersive properties were defined in detail by an analysis of particle size distribution and polydispersity index. Moreover, the microscope studies were executed to evaluate the surface morphology of the studied TiO2 forms. The profiles of titanium dioxides sedimentation in water were determined and the specific surface areas were defined by the BET method.
7
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Effect of Particle Sizes of Slag on Reduction Characteristics of Nickel Slag-Coal Composite Briquette

75%
Li X., Li Y., Xing X., Wang Y., Wen Z., Yang H., Li X., Li Y., Xing X., Wang Y., Wen Z., Yang H.
Archives of Metallurgy and Materials
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2021
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vol. 66
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issue 1
8
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Influence of Particle Size and Sintering Temperatures on Electrical Properties of 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 Lead Free Ceramics

75%
Gul M., Gurbuz M., Gokceyrek A. B., Toktaş A., Kavas T., Dogan A., Gul M., Gurbuz M., Gokceyrek A. B., Toktaş A., Kavas T., Dogan A.
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