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Aggregation processes in colloids: C...

Lach-hab, Mohammed.

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Aggregation processes in colloids: Computer simulations.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Aggregation processes in colloids: Computer simulations./
Author:	Lach-hab, Mohammed.
Description:	146 p.
Notes:	Director: Estela Blaisten-Barojas.
Contained By:	Dissertation Abstracts International59-03B.
Subject:	Chemistry, Physical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9828131
ISBN:	9780591806403

Aggregation processes in colloids: Computer simulations.
Lach-hab, Mohammed.

Aggregation processes in colloids: Computer simulations. - 146 p.

Director: Estela Blaisten-Barojas.

Thesis (Ph.D.)--George Mason University, 1998.

Extensive numerical simulations of diffusion-limited (DLCA) and reaction-limited (RLCA) colloid aggregation were performed to obtain the concentration dependence of the fractal dimension of the clusters before gelation, the average cluster sizes, and the scaling of the cluster size distribution. For DLCA, a square root type of increase of the fractal dimension from its zero-concentration value was found by three different methods: mass to radius of gyration relation,

ISBN: 9780591806403Subjects--Topical Terms:

560527
Chemistry, Physical.

Aggregation processes in colloids: Computer simulations.
LDR:02949nam 2200289 a 45 001 970739
005 20110921
008 110921s1998 eng d
020 $a 9780591806403
035 $a (UMI)AAI9828131
035 $a AAI9828131
040 $a UMI $c UMI
100 1 $a Lach-hab, Mohammed. $3 1294784
245 1 0 $a Aggregation processes in colloids: Computer simulations.
300 $a 146 p.
500 $a Director: Estela Blaisten-Barojas.
500 $a Source: Dissertation Abstracts International, Volume: 59-03, Section: B, page: 1178.
502 $a Thesis (Ph.D.)--George Mason University, 1998.
520 $a Extensive numerical simulations of diffusion-limited (DLCA) and reaction-limited (RLCA) colloid aggregation were performed to obtain the concentration dependence of the fractal dimension of the clusters before gelation, the average cluster sizes, and the scaling of the cluster size distribution. For DLCA, a square root type of increase of the fractal dimension from its zero-concentration value was found by three different methods: mass to radius of gyration relation, $m \sim R\sbsp{g}{d\sb{f}}$, short distance decay of the pair correlation function of isolated clusters, $g (r) = A r\sp{d\sb{f}-3}\ e\sp{-(r/\xi)\sp{a}},$ and from the scattering function of isolated clusters. It is demonstrated that this dependence cannot be obtained from a direct analysis of the scattering function of the full aggregation bath. A recipe was proposed to be used by scattering researchers to extract the fractal dimension from the inversion of the scattering function. Both the exponent z and $z \prime$ that define the power law increase of the weight-average cluster size $s \sb{w}$ and of the number-average cluster size $s \sb{n}$ with time present a square root type increase with concentration. The cluster size distribution function scales as $n \sb{s}(t) \approx N\sb{o}S\sbsp{w}{-2}f(s/S\sb{w})$ where $n \sb{o}$ is the number of initial colloidal particles, s the size of the clusters, and f is a concentration dependent function displaying an asymmetric bell shape in the limit of zero concentration. For RLCA the fractal dimension also presents a square root type of increase with concentration. An exponential increase of the average cluster sizes ( $s \sb{w}\ {\rm and}\ S\sb{n}$) with time was confirmed for a substantial range of the aggregation time. For longer times $s \sb{w}$ departs from the exponential increase with time crossing over to a power law increase. The scaling is similar to the DLCA case but now a power law decay of the function f defines a new exponent $\tau$, which displays a slight concentration dependence around $\tau$ = 1.5.
590 $a School code: 0883.
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Physics, Molecular. $3 1018648
690 $a 0494
690 $a 0495
690 $a 0609
710 2 0 $a George Mason University. $3 1019450
773 0 $t Dissertation Abstracts International $g 59-03B.
790 $a 0883
790 1 0 $a Blaisten-Barojas, Estela, $e advisor
791 $a Ph.D.
792 $a 1998
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9828131