{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/29477"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/29477","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Nonlinear electrokinetic transport and its applications under combined AC and DC fields in micro/nanofluidic interface devices","abstract":"The integration of micro/nanofluidic devices led to many interesting phenomena and one of the most important and complex phenomenon among them is concentration polarization. In this thesis, we provide new physical insights in micro/nanofluidic interface devices on the application of AC and DC electric fields. By performing detailed numerical simulations based on coupled Poisson, Nernst−Planck, and incompressible Navier−Stokes equations, we discuss the electrokinetic transport and other hydrodynamic effects under the application of combined AC and DC electric fields for different nondimensional EDL thickness and nanochannel wall surface charge density. We understand that for a highly ion−selective nanochannel, the application of combined AC/DC electric field, at amplitudes greater than the DC voltage and at low Strouhal number, results in large dual concentration polarization regions (with unequal lengths) at both the micro/nanofluidic interfaces due to large and unequal voltage drops at these junctions. The highly nonlinear potential distribution gives rise to an electric field and body force that changes the electrokinetic fluid velocity from that obtained on the application of only a DC source. With the understanding of nonlinear electrokinetic transport under combined AC/DC fields, we propose a novel technique of increasing the product concentration of an enzymatic reaction inside the nanofluidic channel.","abstract_html":"The integration of micro/nanofluidic devices led to many interesting phenomena and one of the most important and complex phenomenon among them is concentration polarization. In this thesis, we provide new physical insights in micro/nanofluidic interface devices on the application of AC and DC electric fields. By performing detailed numerical simulations based on coupled Poisson, Nernst−Planck, and incompressible Navier−Stokes equations, we discuss the electrokinetic transport and other hydrodynamic effects under the application of combined AC and DC electric fields for different nondimensional EDL thickness and nanochannel wall surface charge density. We understand that for a highly ion−selective nanochannel, the application of combined AC/DC electric field, at amplitudes greater than the DC voltage and at low Strouhal number, results in large dual concentration polarization regions (with unequal lengths) at both the micro/nanofluidic interfaces due to large and unequal voltage drops at these junctions. The highly nonlinear potential distribution gives rise to an electric field and body force that changes the electrokinetic fluid velocity from that obtained on the application of only a DC source. With the understanding of nonlinear electrokinetic transport under combined AC/DC fields, we propose a novel technique of increasing the product concentration of an enzymatic reaction inside the nanofluidic channel.","abstract_has_math":false,"creators":["Nandigana, Vishal"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Aluru, Narayana R."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-02-01T00:48:22Z","date_published":"2012-02-01T00:48:22Z","updated_at":"2026-07-22T22:25:27Z","subjects":["Concentration Polarization","Nonlinear Electrokinetic transport","Micro/Nanofluidic interface devices","AC/DC electric fields","Debye length","space charge","alternating current (AC)","direct current (DC)"],"languages":["en"],"rights":["Copyright 2011 Vishal Venkata Raghave Nandigana"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/29477","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Aluru, Narayana R."]},{"key":"dc:creator","label":"Author","values":["Nandigana, Vishal"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2012-02-01T00:48:22Z","2014-02-01T11:00:29Z","2011-12"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Concentration Polarization","Nonlinear Electrokinetic transport","Micro/Nanofluidic interface devices","AC/DC electric fields","Debye length","space charge","alternating current (AC)","direct current (DC)"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2011 Vishal Venkata Raghave Nandigana"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/29477"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The integration of micro/nanofluidic devices led to many interesting phenomena and one of the most important and complex phenomenon among them is concentration polarization. In this thesis, we provide new physical insights in micro/nanofluidic interface devices on the application of AC and DC electric fields. By performing detailed numerical simulations based on coupled Poisson, Nernst−Planck, and incompressible Navier−Stokes equations, we discuss the electrokinetic transport and other hydrodynamic effects under the application of combined AC and DC electric fields for different nondimensional EDL thickness and nanochannel wall surface charge density. We understand that for a highly ion−selective nanochannel, the application of combined AC/DC electric field, at amplitudes greater than the DC voltage and at low Strouhal number, results in large dual concentration polarization regions (with unequal lengths) at both the micro/nanofluidic interfaces due to large and unequal voltage drops at these junctions. The highly nonlinear potential distribution gives rise to an electric field and body force that changes the electrokinetic fluid velocity from that obtained on the application of only a DC source. With the understanding of nonlinear electrokinetic transport under combined AC/DC fields, we propose a novel technique of increasing the product concentration of an enzymatic reaction inside the nanofluidic channel.","Item withdrawn by Alexis Thompson (athmpsn1@illinois.edu) on 2011-11-29T19:21:23Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 41 charge_effect.eps: 11276 bytes, checksum: f6be36420e41ea39f48a1b8929cd8853 (MD5) diameter_effect.eps: 10804 bytes, checksum: 2148a4712ceaa79b96380da84e7d2f03 (MD5) reaction_setup.eps: 95571 bytes, checksum: b43b9ceb57827a60348e27f229cfccc2 (MD5) figure_12b.eps: 346014 bytes, checksum: 22df23d322e06ea44b122f352946ecd0 (MD5) figure_12a.eps: 229599 bytes, checksum: 66a13380d5bf98bc9e5686b26e330735 (MD5) figure_11.eps: 400816 bytes, checksum: 8d8829b3670eb017c2135327f68af983 (MD5) figure_10.eps: 403266 bytes, checksum: dc982e3f77b39d1ea67a3722de3749d9 (MD5) figure_9b.eps: 188539 bytes, checksum: 7fb62a2df538f25c25aa2730d54e4044 (MD5) figure_9a.eps: 397994 bytes, checksum: f65581c30ecc3d3cbdfecc16ff08217b (MD5) figure_8b.eps: 186880 bytes, checksum: 6ba3b0c1f76c663de5b9bb4e34fbd255 (MD5) figure_8a.eps: 391837 bytes, checksum: 5611420128af61ec8245a141133d7d2e (MD5) figure_7b.eps: 448460 bytes, checksum: c6fe3254cfe76e12e35386a305e5699a (MD5) figure_7a.eps: 438554 bytes, checksum: 96e6bd96d19a82a319fbcfe41fad5040 (MD5) figure_6b.eps: 237294 bytes, checksum: 7acbea70b1032b21498c14cfc0f16275 (MD5) figure_6a.eps: 241483 bytes, checksum: 10e7ef39970061e1c2dd1fe27141913a (MD5) figure_5.eps: 334170 bytes, checksum: f2df04ef9b66ed5977fc700033faf326 (MD5) figure_4b.eps: 280128 bytes, checksum: 550145a690b58a0003e96fab4354a80a (MD5) figure_4a.eps: 392346 bytes, checksum: 89ebbd7bea483d1012ddc47ea70f2ddf (MD5) figure_3.eps: 99393 bytes, checksum: 358b2fabdf8fc586276f9fcdc640ffa9 (MD5) figure_2b.eps: 235347 bytes, checksum: 79339c6f726d98b26ec58ce5c74f7739 (MD5) figure_2a.eps: 239845 bytes, checksum: 65153521197ff559288022b5bbd60d61 (MD5) figure_1.eps: 91625 bytes, checksum: 13c894ab6ccd44158beb55e93b9980d1 (MD5) nonlinear_pressure.eps: 9720 bytes, checksum: 8f416c65b453078ce236582823fef68a (MD5) nonlinear_streamline.eps: 996393 bytes, checksum: a4ac7cc3814ae7577bbb7e7ac0f6f988 (MD5) linear_streamline.eps: 953275 bytes, checksum: 057ee94308b5b5beb37eee2913d87812 (MD5) nonlinear_potential.eps: 10658 bytes, checksum: 3b3e88721f84a9168565b59678b5f9dc (MD5) space_charge.eps: 15029 bytes, checksum: b14248ae59d9445dd2f47a98ed3f2b16 (MD5) no_space_charge.eps: 14646 bytes, checksum: 6410673c4f357f71735cf6f515bdc1e9 (MD5) linear_potential.eps: 10664 bytes, checksum: 0441ee6acaa1d7a82502094884eac36c (MD5) enrichment_depletion.eps: 63679 bytes, checksum: 7329c7d5c3ae33bb9da3c8a5757a8bf6 (MD5) algorithm.eps: 128954 bytes, checksum: cb5f9c814e8093ae7ceaec2ec5b70467 (MD5) dc_set_up.eps: 86003 bytes, checksum: 3b9241ff08949374ca15246a41fc8420 (MD5) i_v_validation.eps: 11920 bytes, checksum: e434d5c4a4705c18fe9234f62aae2042 (MD5) neutrality.eps: 9720 bytes, checksum: 232a29e545edcb32e690becb95922f06 (MD5) model_set_up.eps: 86017 bytes, checksum: e0e1103232d6e13e2b0b0689db7e4bd7 (MD5) EDL_nano.eps: 82796 bytes, checksum: ab7dceb4bd43d0bec0b60004a5716b39 (MD5) EDL_micro.eps: 99420 bytes, checksum: 687709cbff956d6e4e7d99633a958c2d (MD5) EDL_layer.eps: 91185 bytes, checksum: 00ae0c4d57266f3e0a121e634f279ca4 (MD5) ref.bib: 20452 bytes, checksum: b88368727c81df4d1189761e5a8e64a3 (MD5) Nandigana_Vishal.tex: 105428 bytes, checksum: 1028506685b7348d79b6b0ea3c42e6af (MD5) Nandigana_Vishal.pdf: 1378456 bytes, checksum: 54f0a9677bc061c72a3738b6aed9aad4 (MD5)","Made available in DSpace on 2012-02-01T00:48:22Z (GMT). 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In this thesis, we provide new physical insights in micro/nanofluidic interface devices on the application of AC and DC electric fields. By performing detailed numerical simulations based on coupled Poisson, Nernst−Planck, and incompressible Navier−Stokes equations, we discuss the electrokinetic transport and other hydrodynamic effects under the application of combined AC and DC electric fields for different nondimensional EDL thickness and nanochannel wall surface charge density. We understand that for a highly ion−selective nanochannel, the application of combined AC/DC electric field, at amplitudes greater than the DC voltage and at low Strouhal number, results in large dual concentration polarization regions (with unequal lengths) at both the micro/nanofluidic interfaces due to large and unequal voltage drops at these junctions. The highly nonlinear potential distribution gives rise to an electric field and body force that changes the electrokinetic fluid velocity from that obtained on the application of only a DC source. With the understanding of nonlinear electrokinetic transport under combined AC/DC fields, we propose a novel technique of increasing the product concentration of an enzymatic reaction inside the nanofluidic channel.","Item withdrawn by Alexis Thompson (athmpsn1@illinois.edu) on 2011-11-29T19:21:23Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 41 charge_effect.eps: 11276 bytes, checksum: f6be36420e41ea39f48a1b8929cd8853 (MD5) diameter_effect.eps: 10804 bytes, checksum: 2148a4712ceaa79b96380da84e7d2f03 (MD5) reaction_setup.eps: 95571 bytes, checksum: b43b9ceb57827a60348e27f229cfccc2 (MD5) figure_12b.eps: 346014 bytes, checksum: 22df23d322e06ea44b122f352946ecd0 (MD5) figure_12a.eps: 229599 bytes, checksum: 66a13380d5bf98bc9e5686b26e330735 (MD5) figure_11.eps: 400816 bytes, checksum: 8d8829b3670eb017c2135327f68af983 (MD5) figure_10.eps: 403266 bytes, checksum: dc982e3f77b39d1ea67a3722de3749d9 (MD5) figure_9b.eps: 188539 bytes, checksum: 7fb62a2df538f25c25aa2730d54e4044 (MD5) figure_9a.eps: 397994 bytes, checksum: f65581c30ecc3d3cbdfecc16ff08217b (MD5) figure_8b.eps: 186880 bytes, checksum: 6ba3b0c1f76c663de5b9bb4e34fbd255 (MD5) figure_8a.eps: 391837 bytes, checksum: 5611420128af61ec8245a141133d7d2e (MD5) figure_7b.eps: 448460 bytes, checksum: c6fe3254cfe76e12e35386a305e5699a (MD5) figure_7a.eps: 438554 bytes, checksum: 96e6bd96d19a82a319fbcfe41fad5040 (MD5) figure_6b.eps: 237294 bytes, checksum: 7acbea70b1032b21498c14cfc0f16275 (MD5) figure_6a.eps: 241483 bytes, checksum: 10e7ef39970061e1c2dd1fe27141913a (MD5) figure_5.eps: 334170 bytes, checksum: f2df04ef9b66ed5977fc700033faf326 (MD5) figure_4b.eps: 280128 bytes, checksum: 550145a690b58a0003e96fab4354a80a (MD5) figure_4a.eps: 392346 bytes, checksum: 89ebbd7bea483d1012ddc47ea70f2ddf (MD5) figure_3.eps: 99393 bytes, checksum: 358b2fabdf8fc586276f9fcdc640ffa9 (MD5) figure_2b.eps: 235347 bytes, checksum: 79339c6f726d98b26ec58ce5c74f7739 (MD5) figure_2a.eps: 239845 bytes, checksum: 65153521197ff559288022b5bbd60d61 (MD5) figure_1.eps: 91625 bytes, checksum: 13c894ab6ccd44158beb55e93b9980d1 (MD5) nonlinear_pressure.eps: 9720 bytes, checksum: 8f416c65b453078ce236582823fef68a (MD5) nonlinear_streamline.eps: 996393 bytes, checksum: a4ac7cc3814ae7577bbb7e7ac0f6f988 (MD5) linear_streamline.eps: 953275 bytes, checksum: 057ee94308b5b5beb37eee2913d87812 (MD5) nonlinear_potential.eps: 10658 bytes, checksum: 3b3e88721f84a9168565b59678b5f9dc (MD5) space_charge.eps: 15029 bytes, checksum: b14248ae59d9445dd2f47a98ed3f2b16 (MD5) no_space_charge.eps: 14646 bytes, checksum: 6410673c4f357f71735cf6f515bdc1e9 (MD5) linear_potential.eps: 10664 bytes, checksum: 0441ee6acaa1d7a82502094884eac36c (MD5) enrichment_depletion.eps: 63679 bytes, checksum: 7329c7d5c3ae33bb9da3c8a5757a8bf6 (MD5) algorithm.eps: 128954 bytes, checksum: cb5f9c814e8093ae7ceaec2ec5b70467 (MD5) dc_set_up.eps: 86003 bytes, checksum: 3b9241ff08949374ca15246a41fc8420 (MD5) i_v_validation.eps: 11920 bytes, checksum: e434d5c4a4705c18fe9234f62aae2042 (MD5) neutrality.eps: 9720 bytes, checksum: 232a29e545edcb32e690becb95922f06 (MD5) model_set_up.eps: 86017 bytes, checksum: e0e1103232d6e13e2b0b0689db7e4bd7 (MD5) EDL_nano.eps: 82796 bytes, checksum: ab7dceb4bd43d0bec0b60004a5716b39 (MD5) EDL_micro.eps: 99420 bytes, checksum: 687709cbff956d6e4e7d99633a958c2d (MD5) EDL_layer.eps: 91185 bytes, checksum: 00ae0c4d57266f3e0a121e634f279ca4 (MD5) ref.bib: 20452 bytes, checksum: b88368727c81df4d1189761e5a8e64a3 (MD5) Nandigana_Vishal.tex: 105428 bytes, checksum: 1028506685b7348d79b6b0ea3c42e6af (MD5) Nandigana_Vishal.pdf: 1378456 bytes, checksum: 54f0a9677bc061c72a3738b6aed9aad4 (MD5)","Made available in DSpace on 2012-02-01T00:48:22Z (GMT). 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