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Investigating the mechanism of aggre...

Guelcher, Scott Arthur.

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Investigating the mechanism of aggregation of colloidal particles during electrophoretic deposition.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Investigating the mechanism of aggregation of colloidal particles during electrophoretic deposition./
Author:	Guelcher, Scott Arthur.
Description:	428 p.
Notes:	Source: Dissertation Abstracts International, Volume: 60-11, Section: B, page: 5644.
Contained By:	Dissertation Abstracts International60-11B.
Subject:	Engineering, Chemical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9950007
ISBN:	0599519924

Investigating the mechanism of aggregation of colloidal particles during electrophoretic deposition.
Guelcher, Scott Arthur.

Investigating the mechanism of aggregation of colloidal particles during electrophoretic deposition. - 428 p.

Source: Dissertation Abstracts International, Volume: 60-11, Section: B, page: 5644.

Thesis (Ph.D.)--Carnegie Mellon University, 1999.

Charged particles deposited near an electrode aggregate to form ordered clusters in the presence of both dc and ac applied electric fields. The aggregation process could have important applications in areas such as coatings technology and ceramics processing. This thesis has sought to identify the phenomena driving the aggregation process.

ISBN: 0599519924Subjects--Topical Terms:

1018531
Engineering, Chemical.

Investigating the mechanism of aggregation of colloidal particles during electrophoretic deposition.
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020 $a 0599519924
035 $a (UnM)AAI9950007
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100 1 $a Guelcher, Scott Arthur. $3 1938741
245 1 0 $a Investigating the mechanism of aggregation of colloidal particles during electrophoretic deposition.
300 $a 428 p.
500 $a Source: Dissertation Abstracts International, Volume: 60-11, Section: B, page: 5644.
500 $a Adviser: John L. Anderson.
502 $a Thesis (Ph.D.)--Carnegie Mellon University, 1999.
520 $a Charged particles deposited near an electrode aggregate to form ordered clusters in the presence of both dc and ac applied electric fields. The aggregation process could have important applications in areas such as coatings technology and ceramics processing. This thesis has sought to identify the phenomena driving the aggregation process.
520 $a According to the electroosmotic flow developed by Solomentsev et al. (1997), aggregation in dc electric fields is caused by convection in the electroosmotic flow about deposited particles, and it is therefore an electrokinetic phenomenon which scales linearly with the electric field and the zeta-potential of the particles. Trajectories of pairs of particles aggregating to form doublets have been shown to scale linearly with the electric field and the zeta-potential of the particles, as predicted by the electroosmotic flow model. Furthermore, quantitative agreement has been demonstrated between the experimental and calculated trajectories for surface-to-surface separation distances between the particles ranging from one to two radii. The trajectories were calculated from the electroosmotic flow model with no fitting parameters; the only inputs to the model were the mobility of the deposited particles, the zeta-potential of the particles, and the applied electric field, all of which were measured independently.
520 $a Clustering of colloidal particles deposited near an electrode in ac fields has also been observed, but a suitable model for the aggregation process has not been proposed and quantitative data in the literature are scarce. Trajectories of pairs of particles aggregating to form doublets in an ac field have been shown to scale with the root-mean-square (rms) electric field raised to the power 1.4 over the range of electric fields 10--35 V/cm (100-Hz sine and square waves). The aggregation is also frequency dependent; the doublets aggregate fastest at 30 Hz (square wave) and slowest at 500 Hz (square wave), while the interaction is repulsive at 1 kHz (square wave). The advantage of ac fields is that the process can operated at frequencies sufficiently high to avoid the negative effects of electrochemical reactions.
590 $a School code: 0041.
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Physics, Fluid and Plasma. $3 1018402
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690 $a 0494
690 $a 0759
710 2 0 $a Carnegie Mellon University. $3 1018096
773 0 $t Dissertation Abstracts International $g 60-11B.
790 1 0 $a Anderson, John L., $e advisor
790 $a 0041
791 $a Ph.D.
792 $a 1999
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9950007