The behavior of active diffusiophoretic suspensions: An accelerated Laplacian dynamics study
Diffusiophoresis is the process by which a colloidal particle moves in response to the concentration gradient of a chemical solute. Chemically active particles generate solute concentration gradients via surface chemical reactions which can result in their own motion — the self-diffusiophoresis of J...
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Veröffentlicht in: | The Journal of chemical physics 2016-10, Vol.145 (13), p.134902-134902 |
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creator | Yan, Wen Brady, John F. |
description | Diffusiophoresis is the process by which a colloidal particle moves in response to the concentration gradient of a chemical solute. Chemically active particles generate solute concentration gradients via surface chemical reactions which can result in their own motion — the self-diffusiophoresis of Janus particles — and in the motion of other nearby particles — normal down-gradient diffusiophoresis. The long-range nature of the concentration disturbance created by a reactive particle results in strong interactions among particles and can lead to the formation of clusters and even coexisting dense and dilute regions often seen in active matter systems. In this work, we present a general method to determine the many-particle solute concentration field allowing the dynamic simulation of the motion of thousands of reactive particles. With the simulation method, we first clarify and demonstrate the notion of “chemical screening,” whereby the long-ranged interactions become exponentially screened, which is essential for otherwise diffusiophoretic suspensions would be unconditionally unstable. Simulations show that uniformly reactive particles, which do not self-propel, form loosely packed clusters but no coexistence is observed. The simulations also reveal that there is a stability threshold — when the “chemical fuel” concentration is low enough, thermal Brownian motion is able to overcome diffusiophoretic attraction. Janus particles that self-propel show coexistence, but, interestingly, the stability threshold for clustering is not affected by the self-motion. |
doi_str_mv | 10.1063/1.4963722 |
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Chemically active particles generate solute concentration gradients via surface chemical reactions which can result in their own motion — the self-diffusiophoresis of Janus particles — and in the motion of other nearby particles — normal down-gradient diffusiophoresis. The long-range nature of the concentration disturbance created by a reactive particle results in strong interactions among particles and can lead to the formation of clusters and even coexisting dense and dilute regions often seen in active matter systems. In this work, we present a general method to determine the many-particle solute concentration field allowing the dynamic simulation of the motion of thousands of reactive particles. With the simulation method, we first clarify and demonstrate the notion of “chemical screening,” whereby the long-ranged interactions become exponentially screened, which is essential for otherwise diffusiophoretic suspensions would be unconditionally unstable. Simulations show that uniformly reactive particles, which do not self-propel, form loosely packed clusters but no coexistence is observed. The simulations also reveal that there is a stability threshold — when the “chemical fuel” concentration is low enough, thermal Brownian motion is able to overcome diffusiophoretic attraction. Janus particles that self-propel show coexistence, but, interestingly, the stability threshold for clustering is not affected by the self-motion.</description><identifier>ISSN: 0021-9606</identifier><identifier>EISSN: 1089-7690</identifier><identifier>DOI: 10.1063/1.4963722</identifier><identifier>PMID: 27782418</identifier><identifier>CODEN: JCPSA6</identifier><language>eng</language><publisher>United States: American Institute of Physics</publisher><subject>Brownian motion ; Chemical fuels ; Chemical reactions ; Clustering ; Colloiding ; Concentration gradient ; Motion stability ; Nanoparticles ; Organic chemistry ; Simulation ; Strong interactions (field theory)</subject><ispartof>The Journal of chemical physics, 2016-10, Vol.145 (13), p.134902-134902</ispartof><rights>Author(s)</rights><rights>2016 Author(s). 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Chemically active particles generate solute concentration gradients via surface chemical reactions which can result in their own motion — the self-diffusiophoresis of Janus particles — and in the motion of other nearby particles — normal down-gradient diffusiophoresis. The long-range nature of the concentration disturbance created by a reactive particle results in strong interactions among particles and can lead to the formation of clusters and even coexisting dense and dilute regions often seen in active matter systems. In this work, we present a general method to determine the many-particle solute concentration field allowing the dynamic simulation of the motion of thousands of reactive particles. With the simulation method, we first clarify and demonstrate the notion of “chemical screening,” whereby the long-ranged interactions become exponentially screened, which is essential for otherwise diffusiophoretic suspensions would be unconditionally unstable. Simulations show that uniformly reactive particles, which do not self-propel, form loosely packed clusters but no coexistence is observed. The simulations also reveal that there is a stability threshold — when the “chemical fuel” concentration is low enough, thermal Brownian motion is able to overcome diffusiophoretic attraction. Janus particles that self-propel show coexistence, but, interestingly, the stability threshold for clustering is not affected by the self-motion.</description><subject>Brownian motion</subject><subject>Chemical fuels</subject><subject>Chemical reactions</subject><subject>Clustering</subject><subject>Colloiding</subject><subject>Concentration gradient</subject><subject>Motion stability</subject><subject>Nanoparticles</subject><subject>Organic chemistry</subject><subject>Simulation</subject><subject>Strong interactions (field theory)</subject><issn>0021-9606</issn><issn>1089-7690</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNp90F9r2zAUBXAxVpo020O_wBDspS2405VkS95bKf0Hgb60bwMhy9dEJbE8yQ7k208l6QqD9enC5cfhcAg5BXYJrBI_4FLWlVCcfyJzYLouVFWzz2TOGIeirlg1IycpvTDGQHF5TGZcKc0l6Dn59bRC2uDKbn2INHTUutFvkba-66bkw7AKEUfvaJrSgH3-9Oknveqzc7jGaEds6dIOa-u87Wm76-3Gu0TTOLW7L-Sos-uEXw93QZ5vb56u74vl493D9dWycFLLseA6t1GaYSmktUIz1zorEJuScyEUMs1rJbGplQbH0DmuAbkDKbuWOajFgpztc4cYfk-YRrPxKddb2x7DlAxoUVaqLqHM9Ps_9CVMsc_tDAcOlQAheFbne-ViSCliZ4boNzbuDDDzOrkBc5g822-HxKnZYPtXvm2cwcUeJOdHO-YFP0z7L96G-A7N0HbiD-A8ltg</recordid><startdate>20161007</startdate><enddate>20161007</enddate><creator>Yan, Wen</creator><creator>Brady, John F.</creator><general>American Institute of Physics</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>7X8</scope><orcidid>https://orcid.org/0000-0002-9189-0840</orcidid></search><sort><creationdate>20161007</creationdate><title>The behavior of active diffusiophoretic suspensions: An accelerated Laplacian dynamics study</title><author>Yan, Wen ; Brady, John F.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c484t-28782780e534aa380cdca3eeb522337e082974eb9781c0ecc281e2c144fd0c193</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Brownian motion</topic><topic>Chemical fuels</topic><topic>Chemical reactions</topic><topic>Clustering</topic><topic>Colloiding</topic><topic>Concentration gradient</topic><topic>Motion stability</topic><topic>Nanoparticles</topic><topic>Organic chemistry</topic><topic>Simulation</topic><topic>Strong interactions (field theory)</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Yan, Wen</creatorcontrib><creatorcontrib>Brady, John F.</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>MEDLINE - Academic</collection><jtitle>The Journal of chemical physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Yan, Wen</au><au>Brady, John F.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The behavior of active diffusiophoretic suspensions: An accelerated Laplacian dynamics study</atitle><jtitle>The Journal of chemical physics</jtitle><addtitle>J Chem Phys</addtitle><date>2016-10-07</date><risdate>2016</risdate><volume>145</volume><issue>13</issue><spage>134902</spage><epage>134902</epage><pages>134902-134902</pages><issn>0021-9606</issn><eissn>1089-7690</eissn><coden>JCPSA6</coden><abstract>Diffusiophoresis is the process by which a colloidal particle moves in response to the concentration gradient of a chemical solute. Chemically active particles generate solute concentration gradients via surface chemical reactions which can result in their own motion — the self-diffusiophoresis of Janus particles — and in the motion of other nearby particles — normal down-gradient diffusiophoresis. The long-range nature of the concentration disturbance created by a reactive particle results in strong interactions among particles and can lead to the formation of clusters and even coexisting dense and dilute regions often seen in active matter systems. In this work, we present a general method to determine the many-particle solute concentration field allowing the dynamic simulation of the motion of thousands of reactive particles. With the simulation method, we first clarify and demonstrate the notion of “chemical screening,” whereby the long-ranged interactions become exponentially screened, which is essential for otherwise diffusiophoretic suspensions would be unconditionally unstable. Simulations show that uniformly reactive particles, which do not self-propel, form loosely packed clusters but no coexistence is observed. The simulations also reveal that there is a stability threshold — when the “chemical fuel” concentration is low enough, thermal Brownian motion is able to overcome diffusiophoretic attraction. Janus particles that self-propel show coexistence, but, interestingly, the stability threshold for clustering is not affected by the self-motion.</abstract><cop>United States</cop><pub>American Institute of Physics</pub><pmid>27782418</pmid><doi>10.1063/1.4963722</doi><tpages>18</tpages><orcidid>https://orcid.org/0000-0002-9189-0840</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Brownian motion Chemical fuels Chemical reactions Clustering Colloiding Concentration gradient Motion stability Nanoparticles Organic chemistry Simulation Strong interactions (field theory) |
title | The behavior of active diffusiophoretic suspensions: An accelerated Laplacian dynamics study |
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