Clogging of microchannels by nano-particles due to hetero-coagulation in elongational flow
Small fraction of micrometer-sized particles (100–1000 ppm) induces hetero-coagulation in concentrated colloidal dispersions, when such dispersions are exposed to converging flow fields, e.g. during classical processing operations (e.g. filtration or pumping) or in microfluidic devices. [Display omi...
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| Veröffentlicht in: | Journal of colloid and interface science 2010-12, Vol.352 (2), p.265-277 |
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| container_title | Journal of colloid and interface science |
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| creator | Georgieva, K. Dijkstra, D.J. Fricke, H. Willenbacher, N. |
| description | Small fraction of micrometer-sized particles (100–1000
ppm) induces hetero-coagulation in concentrated colloidal dispersions, when such dispersions are exposed to converging flow fields, e.g. during classical processing operations (e.g. filtration or pumping) or in microfluidic devices.
[Display omitted]
► Clogging of microchannels during processing of concentrated dispersions. ► Hetero-coagulation of primary particles and small fractions of micron-sized impurities in the converging flow field at the channel entrance. ► Aggregation can be avoided by ► Reducing the amount of micron-sized particles. ► Improving colloidal stability of primary particles. ► Applying high flow rates and steep entrance angles.
We have investigated the phenomenon of flow-induced aggregation in highly concentrated colloidal dispersions exposed to strongly converging flow fields. This phenomenon is relevant not only for classical technical operations like coating, pumping or filtration, but also for the application of concentrated suspensions in upcoming processing technologies based on microfluidic devices. A ring-slit device (gap height 10–25
μm), which allows for a variation of flow kinematics in a wide range, has been developed in order to investigate this phenomenon. Various polymer dispersions with different particle surface properties have been used as model systems. Our experiments exclude, that channel clogging is due to retention of pre-existing aggregates, fouling or hydrodynamic bridging. Instead, we demonstrate that clogging of the microchannel is induced by hetero-coagulation between primary colloidal particles and micron-sized impurities present at concentrations on the order of 100–1000
ppm. Clogging can occur even if the diameter of these impurities is less than a tenth of the gap height. Aggregation takes place in the converging flow field at the channel entrance, but not in the shear field within the slit. It can be suppressed by appropriate stabilization of the primary particles. |
| doi_str_mv | 10.1016/j.jcis.2010.08.065 |
| format | Article |
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ppm) induces hetero-coagulation in concentrated colloidal dispersions, when such dispersions are exposed to converging flow fields, e.g. during classical processing operations (e.g. filtration or pumping) or in microfluidic devices.
[Display omitted]
► Clogging of microchannels during processing of concentrated dispersions. ► Hetero-coagulation of primary particles and small fractions of micron-sized impurities in the converging flow field at the channel entrance. ► Aggregation can be avoided by ► Reducing the amount of micron-sized particles. ► Improving colloidal stability of primary particles. ► Applying high flow rates and steep entrance angles.
We have investigated the phenomenon of flow-induced aggregation in highly concentrated colloidal dispersions exposed to strongly converging flow fields. This phenomenon is relevant not only for classical technical operations like coating, pumping or filtration, but also for the application of concentrated suspensions in upcoming processing technologies based on microfluidic devices. A ring-slit device (gap height 10–25
μm), which allows for a variation of flow kinematics in a wide range, has been developed in order to investigate this phenomenon. Various polymer dispersions with different particle surface properties have been used as model systems. Our experiments exclude, that channel clogging is due to retention of pre-existing aggregates, fouling or hydrodynamic bridging. Instead, we demonstrate that clogging of the microchannel is induced by hetero-coagulation between primary colloidal particles and micron-sized impurities present at concentrations on the order of 100–1000
ppm. Clogging can occur even if the diameter of these impurities is less than a tenth of the gap height. Aggregation takes place in the converging flow field at the channel entrance, but not in the shear field within the slit. It can be suppressed by appropriate stabilization of the primary particles.</description><identifier>ISSN: 0021-9797</identifier><identifier>EISSN: 1095-7103</identifier><identifier>DOI: 10.1016/j.jcis.2010.08.065</identifier><identifier>PMID: 20851405</identifier><identifier>CODEN: JCISA5</identifier><language>eng</language><publisher>Amsterdam: Elsevier Inc</publisher><subject>Agglomeration ; Channels ; Chemistry ; Colloidal dispersions ; Colloidal state and disperse state ; Colloids ; Colloids - chemistry ; Devices ; Dispersions ; Elongational flow ; Exact sciences and technology ; Flow-induced aggregation ; General and physical chemistry ; Hetero-coagulation ; Impurities ; Microfluidic Analytical Techniques ; Microfluidics ; Nanoparticles - chemistry ; Nanostructure ; Particle Size ; Physical and chemical studies. Granulometry. Electrokinetic phenomena ; Plugging ; Rheology ; Surface physical chemistry ; Surface Properties</subject><ispartof>Journal of colloid and interface science, 2010-12, Vol.352 (2), p.265-277</ispartof><rights>2010 Elsevier Inc.</rights><rights>2015 INIST-CNRS</rights><rights>Copyright © 2010 Elsevier Inc. All rights reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c560t-53dcaf6869a238c7a1a8901d380c9f7dc148b2b60953b6f0c763dbc0db9d85d53</citedby><cites>FETCH-LOGICAL-c560t-53dcaf6869a238c7a1a8901d380c9f7dc148b2b60953b6f0c763dbc0db9d85d53</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.jcis.2010.08.065$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>315,781,785,3551,27929,27930,46000</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=23392945$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/20851405$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Georgieva, K.</creatorcontrib><creatorcontrib>Dijkstra, D.J.</creatorcontrib><creatorcontrib>Fricke, H.</creatorcontrib><creatorcontrib>Willenbacher, N.</creatorcontrib><title>Clogging of microchannels by nano-particles due to hetero-coagulation in elongational flow</title><title>Journal of colloid and interface science</title><addtitle>J Colloid Interface Sci</addtitle><description>Small fraction of micrometer-sized particles (100–1000
ppm) induces hetero-coagulation in concentrated colloidal dispersions, when such dispersions are exposed to converging flow fields, e.g. during classical processing operations (e.g. filtration or pumping) or in microfluidic devices.
[Display omitted]
► Clogging of microchannels during processing of concentrated dispersions. ► Hetero-coagulation of primary particles and small fractions of micron-sized impurities in the converging flow field at the channel entrance. ► Aggregation can be avoided by ► Reducing the amount of micron-sized particles. ► Improving colloidal stability of primary particles. ► Applying high flow rates and steep entrance angles.
We have investigated the phenomenon of flow-induced aggregation in highly concentrated colloidal dispersions exposed to strongly converging flow fields. This phenomenon is relevant not only for classical technical operations like coating, pumping or filtration, but also for the application of concentrated suspensions in upcoming processing technologies based on microfluidic devices. A ring-slit device (gap height 10–25
μm), which allows for a variation of flow kinematics in a wide range, has been developed in order to investigate this phenomenon. Various polymer dispersions with different particle surface properties have been used as model systems. Our experiments exclude, that channel clogging is due to retention of pre-existing aggregates, fouling or hydrodynamic bridging. Instead, we demonstrate that clogging of the microchannel is induced by hetero-coagulation between primary colloidal particles and micron-sized impurities present at concentrations on the order of 100–1000
ppm. Clogging can occur even if the diameter of these impurities is less than a tenth of the gap height. Aggregation takes place in the converging flow field at the channel entrance, but not in the shear field within the slit. It can be suppressed by appropriate stabilization of the primary particles.</description><subject>Agglomeration</subject><subject>Channels</subject><subject>Chemistry</subject><subject>Colloidal dispersions</subject><subject>Colloidal state and disperse state</subject><subject>Colloids</subject><subject>Colloids - chemistry</subject><subject>Devices</subject><subject>Dispersions</subject><subject>Elongational flow</subject><subject>Exact sciences and technology</subject><subject>Flow-induced aggregation</subject><subject>General and physical chemistry</subject><subject>Hetero-coagulation</subject><subject>Impurities</subject><subject>Microfluidic Analytical Techniques</subject><subject>Microfluidics</subject><subject>Nanoparticles - chemistry</subject><subject>Nanostructure</subject><subject>Particle Size</subject><subject>Physical and chemical studies. Granulometry. Electrokinetic phenomena</subject><subject>Plugging</subject><subject>Rheology</subject><subject>Surface physical chemistry</subject><subject>Surface Properties</subject><issn>0021-9797</issn><issn>1095-7103</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkc2OFCEURonROO3oC7gwbIyzqfYCDQWJm0nHv2QSN7pxQyigeujQ0ELVmHl7Kbud5bi64eZ8X4CD0GsCawJEvN-v9zbUNYW2ALkGwZ-gFQHFu54Ae4pWAJR0qlf9BXpR6x6AEM7Vc3RBQXKyAb5CP7cx73Yh7XAe8SHYku2tScnHiod7nEzK3dGUKdjoK3azx1PGt37yJXc2m90czRRywiFhH3Pa_T2ZiMeYf79Ez0YTq391npfox6eP37dfuptvn79ur286ywVMHWfOmlFIoQxl0vaGGKmAOCbBqrF3lmzkQAfR3sUGMYLtBXODBTcoJ7nj7BK9O_UeS_41-zrpQ6jWx2iSz3PVrUwIpST9L9lzRRhRVDTy6lGSiJ4ISnohG0pPaPu7Wosf9bGEgyn3moBePOm9XjzpxZMGqZunFnpz7p-Hg3cPkX9iGvD2DJhqTRyLSUvHA8eYomqzcB9OXDPm74Ivutrgk_UuFG8n7XJ47B5_APDUsNo</recordid><startdate>20101215</startdate><enddate>20101215</enddate><creator>Georgieva, K.</creator><creator>Dijkstra, D.J.</creator><creator>Fricke, H.</creator><creator>Willenbacher, N.</creator><general>Elsevier Inc</general><general>Elsevier</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>L7M</scope><scope>7X8</scope></search><sort><creationdate>20101215</creationdate><title>Clogging of microchannels by nano-particles due to hetero-coagulation in elongational flow</title><author>Georgieva, K. ; Dijkstra, D.J. ; Fricke, H. ; Willenbacher, N.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c560t-53dcaf6869a238c7a1a8901d380c9f7dc148b2b60953b6f0c763dbc0db9d85d53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>Agglomeration</topic><topic>Channels</topic><topic>Chemistry</topic><topic>Colloidal dispersions</topic><topic>Colloidal state and disperse state</topic><topic>Colloids</topic><topic>Colloids - chemistry</topic><topic>Devices</topic><topic>Dispersions</topic><topic>Elongational flow</topic><topic>Exact sciences and technology</topic><topic>Flow-induced aggregation</topic><topic>General and physical chemistry</topic><topic>Hetero-coagulation</topic><topic>Impurities</topic><topic>Microfluidic Analytical Techniques</topic><topic>Microfluidics</topic><topic>Nanoparticles - chemistry</topic><topic>Nanostructure</topic><topic>Particle Size</topic><topic>Physical and chemical studies. Granulometry. Electrokinetic phenomena</topic><topic>Plugging</topic><topic>Rheology</topic><topic>Surface physical chemistry</topic><topic>Surface Properties</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Georgieva, K.</creatorcontrib><creatorcontrib>Dijkstra, D.J.</creatorcontrib><creatorcontrib>Fricke, H.</creatorcontrib><creatorcontrib>Willenbacher, N.</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of colloid and interface science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Georgieva, K.</au><au>Dijkstra, D.J.</au><au>Fricke, H.</au><au>Willenbacher, N.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Clogging of microchannels by nano-particles due to hetero-coagulation in elongational flow</atitle><jtitle>Journal of colloid and interface science</jtitle><addtitle>J Colloid Interface Sci</addtitle><date>2010-12-15</date><risdate>2010</risdate><volume>352</volume><issue>2</issue><spage>265</spage><epage>277</epage><pages>265-277</pages><issn>0021-9797</issn><eissn>1095-7103</eissn><coden>JCISA5</coden><abstract>Small fraction of micrometer-sized particles (100–1000
ppm) induces hetero-coagulation in concentrated colloidal dispersions, when such dispersions are exposed to converging flow fields, e.g. during classical processing operations (e.g. filtration or pumping) or in microfluidic devices.
[Display omitted]
► Clogging of microchannels during processing of concentrated dispersions. ► Hetero-coagulation of primary particles and small fractions of micron-sized impurities in the converging flow field at the channel entrance. ► Aggregation can be avoided by ► Reducing the amount of micron-sized particles. ► Improving colloidal stability of primary particles. ► Applying high flow rates and steep entrance angles.
We have investigated the phenomenon of flow-induced aggregation in highly concentrated colloidal dispersions exposed to strongly converging flow fields. This phenomenon is relevant not only for classical technical operations like coating, pumping or filtration, but also for the application of concentrated suspensions in upcoming processing technologies based on microfluidic devices. A ring-slit device (gap height 10–25
μm), which allows for a variation of flow kinematics in a wide range, has been developed in order to investigate this phenomenon. Various polymer dispersions with different particle surface properties have been used as model systems. Our experiments exclude, that channel clogging is due to retention of pre-existing aggregates, fouling or hydrodynamic bridging. Instead, we demonstrate that clogging of the microchannel is induced by hetero-coagulation between primary colloidal particles and micron-sized impurities present at concentrations on the order of 100–1000
ppm. Clogging can occur even if the diameter of these impurities is less than a tenth of the gap height. Aggregation takes place in the converging flow field at the channel entrance, but not in the shear field within the slit. It can be suppressed by appropriate stabilization of the primary particles.</abstract><cop>Amsterdam</cop><pub>Elsevier Inc</pub><pmid>20851405</pmid><doi>10.1016/j.jcis.2010.08.065</doi><tpages>13</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Journal of colloid and interface science, 2010-12, Vol.352 (2), p.265-277 |
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| subjects | Agglomeration Channels Chemistry Colloidal dispersions Colloidal state and disperse state Colloids Colloids - chemistry Devices Dispersions Elongational flow Exact sciences and technology Flow-induced aggregation General and physical chemistry Hetero-coagulation Impurities Microfluidic Analytical Techniques Microfluidics Nanoparticles - chemistry Nanostructure Particle Size Physical and chemical studies. Granulometry. Electrokinetic phenomena Plugging Rheology Surface physical chemistry Surface Properties |
| title | Clogging of microchannels by nano-particles due to hetero-coagulation in elongational flow |
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