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Multi-stepped dielectrophoresis for separation of particles
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för analytisk kemi.
2006 Ingår i: Journal of Chromatography A, Vol. 1131, s. 261–266-Artikel i tidskrift (Refereegranskat) Published
Ort, förlag, år, upplaga, sidor
2006. Vol. 1131, s. 261–266-
Identifikatorer
URN: urn:nbn:se:su:diva-24546DOI: doi:10.1016/j.chroma.2006.07.022OAI: oai:DiVA.org:su-24546DiVA, id: diva2:197770
Anmärkning
Part of urn:nbn:se:su:diva-7170Tillgänglig från: 2007-11-07 Skapad: 2007-11-07Bibliografiskt granskad
Ingår i avhandling
1. New Tools for Trapping and Separation in Gas Chromatography and Dielectrophoresis: Improved Performance by Aid of Computer Simulation
Öppna denna publikation i ny flik eller fönster >>New Tools for Trapping and Separation in Gas Chromatography and Dielectrophoresis: Improved Performance by Aid of Computer Simulation
2007 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Computer simulations can be useful aids for both developing new analytical methods and enhancing the performance of existing techniques. This thesis is based on studies in which computer simulations were key elements in the development of several new tools for use in gas chromatography and dielectrophoresis. In gas chromatography, gaseous analytes are separated by exploiting differences in their partitioning between different phases, and after their partitioning parameters have been determined the separations can be computationally predicted, and optimized, for a wide range of operating conditions. Similarly, in dielectrophoresis, particles with differing polarizability or size can be separated, and since particle trajectories within a separation device can be predicted using computations, the suitability of new designs, applications of forces and combinations of operational parameters can be assessed without necessarily making or empirically testing all of the variants.

Using two existing numerical methods combined with semi-empirical determinations of retention behavior, temperature-programmed gas chromatograms were predicted with less than one percent deviations from experimental data, and a new method for improving the capacity of a gas-trapping device was predicted and experimentally verified. In addition, two new concepts with potential capacity to enhance dielectrophoretic separations were developed and tested in simulations. The first provides a promising way to improve the trapping of bacteria in media with elevated conductivity by using super-positioned electric fields, and the second a way to increase selectivity in the separation of bio-particles by using multiple dielectrophoretic cycles. The studies also introduced a more accurate method for determining the conductivity of suspensions of bacteria, and a new computational method for determining the dielectrophoretic behavior of particles in concentrated suspensions.

The scientific studies are summarized and discussed in the main text of this thesis, and presented in detail in seven appended papers.

Ort, förlag, år, upplaga, sidor
Stockholm: Institutionen för analytisk kemi, 2007. s. 92
Nyckelord
gas chromatography, dielectrophoresis, computer simulation, finite element method, trapping, separation, lab-on-a-chip
Nationell ämneskategori
Analytisk kemi
Forskningsämne
analytisk kemi
Identifikatorer
urn:nbn:se:su:diva-7170 (URN)978-91-7155-526-7 (ISBN)
Disputation
2007-12-07, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 10:00
Opponent
Handledare
Tillgänglig från: 2007-11-07 Skapad: 2007-11-07Bibliografiskt granskad

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