The Isotropic−Nematic Interface in Suspensions of Na−Fluorohectorite Synthetic Clay
Colloidal suspensions of Na−fluorohectorite synthetic clay platelets in saline water exhibit coexisting isotropic and nematic phases, due to gravitational separation of the polydisperse particles. We study the ordering of the platelets at the interfaces between various coexisting phases. Four differ...
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| Veröffentlicht in: | Langmuir 2009-11, Vol.25 (21), p.12507-12515 |
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| creator | Hemmen, Henrik Ringdal, Nils I De Azevedo, Eduardo N Engelsberg, Mario Hansen, Elisabeth L Méheust, Yves Fossum, Jon O Knudsen, Kenneth D |
| description | Colloidal suspensions of Na−fluorohectorite synthetic clay platelets in saline water exhibit coexisting isotropic and nematic phases, due to gravitational separation of the polydisperse particles. We study the ordering of the platelets at the interfaces between various coexisting phases. Four different experimental techniques are employed: visual observation of birefringence, synchrotron wide angle and small-angle X-ray scattering, and magnetic resonance imaging. We find that at the narrow isotropic sol−nematic sol interface the platelets are lying horizontally, i.e. with their mean platelet normal along the vertical direction. The experiments indicate that the platelets align homeotropically both at the isotropic sol−nematic sol interface and at the nematic sol−wall interface. We further investigate the complex alignment effect of a horizontally applied magnetic field in the nematic sol, and we compare it with the adjacent nematic gel. |
| doi_str_mv | 10.1021/la901784k |
| format | Article |
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We study the ordering of the platelets at the interfaces between various coexisting phases. Four different experimental techniques are employed: visual observation of birefringence, synchrotron wide angle and small-angle X-ray scattering, and magnetic resonance imaging. We find that at the narrow isotropic sol−nematic sol interface the platelets are lying horizontally, i.e. with their mean platelet normal along the vertical direction. The experiments indicate that the platelets align homeotropically both at the isotropic sol−nematic sol interface and at the nematic sol−wall interface. We further investigate the complex alignment effect of a horizontally applied magnetic field in the nematic sol, and we compare it with the adjacent nematic gel.</description><identifier>ISSN: 0743-7463</identifier><identifier>EISSN: 1520-5827</identifier><identifier>DOI: 10.1021/la901784k</identifier><identifier>PMID: 19856989</identifier><identifier>CODEN: LANGD5</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>Chemistry ; Colloidal state and disperse state ; Colloids: Surfactants and Self-Assembly, Dispersions, Emulsions, Foams ; Earth Sciences ; Exact sciences and technology ; General and physical chemistry ; Physical and chemical studies. Granulometry. 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We study the ordering of the platelets at the interfaces between various coexisting phases. Four different experimental techniques are employed: visual observation of birefringence, synchrotron wide angle and small-angle X-ray scattering, and magnetic resonance imaging. We find that at the narrow isotropic sol−nematic sol interface the platelets are lying horizontally, i.e. with their mean platelet normal along the vertical direction. The experiments indicate that the platelets align homeotropically both at the isotropic sol−nematic sol interface and at the nematic sol−wall interface. We further investigate the complex alignment effect of a horizontally applied magnetic field in the nematic sol, and we compare it with the adjacent nematic gel.</description><subject>Chemistry</subject><subject>Colloidal state and disperse state</subject><subject>Colloids: Surfactants and Self-Assembly, Dispersions, Emulsions, Foams</subject><subject>Earth Sciences</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Physical and chemical studies. Granulometry. Electrokinetic phenomena</subject><subject>Sciences of the Universe</subject><subject>Surface physical chemistry</subject><issn>0743-7463</issn><issn>1520-5827</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNpt0E9LIzEcxvEgLlrrHnwDMhcRhdnN38nkKGXVQnEPKnsMv8lkaHSa1GRG6DvYsy_RV-KUlvbiKZdPnpAvQmcE_yKYkt8tKExkyV8P0IgIinNRUnmIRlhylktesGN0ktILxlgxro7QMVGlKFSpRujf09xm0xS6GJbOfP7_eLAL6JzJpr6zsQFjM-ezxz4trU8u-JSFJnuAAd62fYhhbk0Xouts9rjy3dyur05aWJ2iHw20yf7cnmP0fPvnaXKfz_7eTSc3sxw4F12ujCqJEERWmFBDCZSyUhwkJhWthbV1rZTkRFFZseFjrGC4rApR8ZrTBqRgY3S92Z1Dq5fRLSCudACn729m2vnUa4xFQYUQ72TAlxu8jOGtt6nTC5eMbVvwNvRJS8aHnpStZ6820sSQUrTNbptgvW6ud80He75d7auFrfdyG3kAF1sAyUDbRPDGpZ2jFBe0oOXegUn6JfTRD-W-efALqYyVVA</recordid><startdate>20091103</startdate><enddate>20091103</enddate><creator>Hemmen, Henrik</creator><creator>Ringdal, Nils I</creator><creator>De Azevedo, Eduardo N</creator><creator>Engelsberg, Mario</creator><creator>Hansen, Elisabeth L</creator><creator>Méheust, Yves</creator><creator>Fossum, Jon O</creator><creator>Knudsen, Kenneth D</creator><general>American Chemical Society</general><scope>IQODW</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>1XC</scope><orcidid>https://orcid.org/0000-0003-1284-3251</orcidid></search><sort><creationdate>20091103</creationdate><title>The Isotropic−Nematic Interface in Suspensions of Na−Fluorohectorite Synthetic Clay</title><author>Hemmen, Henrik ; Ringdal, Nils I ; De Azevedo, Eduardo N ; Engelsberg, Mario ; Hansen, Elisabeth L ; Méheust, Yves ; Fossum, Jon O ; Knudsen, Kenneth D</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a445t-9c9815517b012c21a87b94a701b2d5eedd99741927b352036308b65b4d42fa753</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Chemistry</topic><topic>Colloidal state and disperse state</topic><topic>Colloids: Surfactants and Self-Assembly, Dispersions, Emulsions, Foams</topic><topic>Earth Sciences</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>Physical and chemical studies. Granulometry. Electrokinetic phenomena</topic><topic>Sciences of the Universe</topic><topic>Surface physical chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hemmen, Henrik</creatorcontrib><creatorcontrib>Ringdal, Nils I</creatorcontrib><creatorcontrib>De Azevedo, Eduardo N</creatorcontrib><creatorcontrib>Engelsberg, Mario</creatorcontrib><creatorcontrib>Hansen, Elisabeth L</creatorcontrib><creatorcontrib>Méheust, Yves</creatorcontrib><creatorcontrib>Fossum, Jon O</creatorcontrib><creatorcontrib>Knudsen, Kenneth D</creatorcontrib><collection>Pascal-Francis</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>Hyper Article en Ligne (HAL)</collection><jtitle>Langmuir</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hemmen, Henrik</au><au>Ringdal, Nils I</au><au>De Azevedo, Eduardo N</au><au>Engelsberg, Mario</au><au>Hansen, Elisabeth L</au><au>Méheust, Yves</au><au>Fossum, Jon O</au><au>Knudsen, Kenneth D</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The Isotropic−Nematic Interface in Suspensions of Na−Fluorohectorite Synthetic Clay</atitle><jtitle>Langmuir</jtitle><addtitle>Langmuir</addtitle><date>2009-11-03</date><risdate>2009</risdate><volume>25</volume><issue>21</issue><spage>12507</spage><epage>12515</epage><pages>12507-12515</pages><issn>0743-7463</issn><eissn>1520-5827</eissn><coden>LANGD5</coden><abstract>Colloidal suspensions of Na−fluorohectorite synthetic clay platelets in saline water exhibit coexisting isotropic and nematic phases, due to gravitational separation of the polydisperse particles. We study the ordering of the platelets at the interfaces between various coexisting phases. Four different experimental techniques are employed: visual observation of birefringence, synchrotron wide angle and small-angle X-ray scattering, and magnetic resonance imaging. We find that at the narrow isotropic sol−nematic sol interface the platelets are lying horizontally, i.e. with their mean platelet normal along the vertical direction. The experiments indicate that the platelets align homeotropically both at the isotropic sol−nematic sol interface and at the nematic sol−wall interface. We further investigate the complex alignment effect of a horizontally applied magnetic field in the nematic sol, and we compare it with the adjacent nematic gel.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>19856989</pmid><doi>10.1021/la901784k</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0003-1284-3251</orcidid></addata></record> |
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| subjects | Chemistry Colloidal state and disperse state Colloids: Surfactants and Self-Assembly, Dispersions, Emulsions, Foams Earth Sciences Exact sciences and technology General and physical chemistry Physical and chemical studies. Granulometry. Electrokinetic phenomena Sciences of the Universe Surface physical chemistry |
| title | The Isotropic−Nematic Interface in Suspensions of Na−Fluorohectorite Synthetic Clay |
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