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Modeling and simulation of aggregati...

Iranipour, Gita Taef.

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Modeling and simulation of aggregation processes in colloidal systems.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Modeling and simulation of aggregation processes in colloidal systems./
作者:	Iranipour, Gita Taef.
面頁冊數:	206 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0883.
Contained By:	Dissertation Abstracts International65-02B.
標題:	Engineering, Chemical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3121021
ISBN:	0496683764

Modeling and simulation of aggregation processes in colloidal systems.
Iranipour, Gita Taef.

Modeling and simulation of aggregation processes in colloidal systems. - 206 p.

Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0883.

Thesis (Ph.D.)--University of South Florida, 2004.

This research reports on the quantitative interpretation of measured ultraviolet-visible (UV-vis) spectra of latex polystyrene particles during aggregation processes. The objective of the study is to develop a quantitative method for on-line continuous characterization of aggregation processes. Our proposed approach is based on multiwavelength UV-vis spectroscopy technique for which previous studies have demonstrated that spectra of aggregate suspensions contain quantitative information on their size, shape, chemical composition, and internal structure. The multiwavelength transmission spectra consist of combined absorption and scattering phenomena resulting from interaction of light with the particles during aggregation processes. The amplitude and spectral features depend on the optical properties of the sample. Therefore, accurate estimation of complex refractive index of the particle is essential. The proposed interpretation model (denoted as Mie-FS model) is based on Mie scattering theory, spectral deconvolution techniques, and on the approximation of the optical properties, which is dependent on the composition of the aggregates as a function of the wavelength. The key approximation used in the proposed model is equivalent volume sphere approximation, in conjunction with the fractal mathematics. Model predictions were compared with the series of observed spectral data obtained for 503-nm and 102-nm standard latex polystyrene particles during aggregation processes. It has been shown that the proposed model can reproduce the features of measured spectra during aggregation processes. The sensitivity of the spectra to the model parameters demonstrate that the proposed interpretation model can be used for the quantitative deconvolution of the UV-vis spectra in terms of critical parameters necessary for the characterization of the aggregation processes. The results represents not only the groundwork in establishing a set of critical parameters (e.g., aggregate size, concentration, chemical composition and fractal dimensions) necessary for the characterization of aggregation processes but also suggests the potential of this approach to our understanding of aggregation kinetics for the system of interest.

ISBN: 0496683764Subjects--Topical Terms:

1018531
Engineering, Chemical.

Modeling and simulation of aggregation processes in colloidal systems.
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520 $a This research reports on the quantitative interpretation of measured ultraviolet-visible (UV-vis) spectra of latex polystyrene particles during aggregation processes. The objective of the study is to develop a quantitative method for on-line continuous characterization of aggregation processes. Our proposed approach is based on multiwavelength UV-vis spectroscopy technique for which previous studies have demonstrated that spectra of aggregate suspensions contain quantitative information on their size, shape, chemical composition, and internal structure. The multiwavelength transmission spectra consist of combined absorption and scattering phenomena resulting from interaction of light with the particles during aggregation processes. The amplitude and spectral features depend on the optical properties of the sample. Therefore, accurate estimation of complex refractive index of the particle is essential. The proposed interpretation model (denoted as Mie-FS model) is based on Mie scattering theory, spectral deconvolution techniques, and on the approximation of the optical properties, which is dependent on the composition of the aggregates as a function of the wavelength. The key approximation used in the proposed model is equivalent volume sphere approximation, in conjunction with the fractal mathematics. Model predictions were compared with the series of observed spectral data obtained for 503-nm and 102-nm standard latex polystyrene particles during aggregation processes. It has been shown that the proposed model can reproduce the features of measured spectra during aggregation processes. The sensitivity of the spectra to the model parameters demonstrate that the proposed interpretation model can be used for the quantitative deconvolution of the UV-vis spectra in terms of critical parameters necessary for the characterization of the aggregation processes. The results represents not only the groundwork in establishing a set of critical parameters (e.g., aggregate size, concentration, chemical composition and fractal dimensions) necessary for the characterization of aggregation processes but also suggests the potential of this approach to our understanding of aggregation kinetics for the system of interest.
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