Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/73716
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dc.titleOn-chip trapping and characterization of Cryptosporidium using surface coated ITO-PDMS bonded chips
dc.contributor.authorUnni, H.N.
dc.contributor.authorHartono, D.
dc.contributor.authorLim, K.-M.
dc.date.accessioned2014-06-19T05:38:31Z
dc.date.available2014-06-19T05:38:31Z
dc.date.issued2011
dc.identifier.citationUnni, H.N., Hartono, D., Lim, K.-M. (2011). On-chip trapping and characterization of Cryptosporidium using surface coated ITO-PDMS bonded chips. Advanced Materials Research 254 : 191-194. ScholarBank@NUS Repository.
dc.identifier.isbn9783037851456
dc.identifier.issn10226680
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/73716
dc.description.abstractDielectrophoresis has been shown to have significant potential for the characterization of cells and could become an efficient tool for rapid identification and assessment of microorganisms. The present work is focused on the trapping and characterization of Cryptosporidium pathogen using a microfluidic chip fabricated through a simple, effective bonding of surface coated ITO glass and PDMS. Lithographically patterned ITO glass plates were coated with an alkoxysilane solution DMOAP (N, N - dimethyl-N-octadecyl-3- aminopropyltrimethoxysilyl chloride) prior to bonding with PDMS microchannels. The silane coating was found to enhance the bonding between ITO and PDMS and reduce cell adhesion on the electrodes. Cryptosporidium oocysts, which are 2-4 microns in size and nearly spherical in shape represent the preliminary stage of cell development. The dielectrophoretic transport of cells is dependent on electrical properties such as permittivity and conductivity of the cells. Computational simulations were performed in order to study the effects of channel height, buffer conductivity and applied voltage on the flow and cell transport inside the DEP chip and facilitate effective cell trapping. Videomicroscopic experiments were performed using the fabricated device and the real part of Clausius-Mossotti factor of the cells was estimated from values of critical voltages of particle trapping (corresponding to various field frequencies) at the electrodes. The dielectric properties of the cell compartments (cytoplasm and membrane) were calculated based on a single shell model of the Cryptosporidium oocyst cell. © (2011) Trans Tech Publications, Switzerland.
dc.sourceScopus
dc.subjectClausius Mossotti factor
dc.subjectCryptosporidium
dc.subjectDielectrophoresis
dc.typeConference Paper
dc.contributor.departmentCHEMICAL & BIOMOLECULAR ENGINEERING
dc.contributor.departmentMECHANICAL ENGINEERING
dc.description.sourcetitleAdvanced Materials Research
dc.description.volume254
dc.description.page191-194
dc.identifier.isiut000302670700048
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