Diffusing-Wave Spectroscopy of Concentrated Alumina Suspensions during Gelation
Using diffusing-wave spectroscopy, we followed the aggregation and gelation of concentrated (30 vol%) alumina suspensions. The suspensions were destabilized by either shifting the pH to the isoelectric point or by increasing the ionic strength. Both effects can be achieved continuously and homogeneo...
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| Veröffentlicht in: | Journal of colloid and interface science 2001-09, Vol.241 (1), p.89-97 |
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| container_end_page | 97 |
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| container_issue | 1 |
| container_start_page | 89 |
| container_title | Journal of colloid and interface science |
| container_volume | 241 |
| creator | Wyss, Hans M. Romer, Sara Scheffold, Frank Schurtenberger, Peter Gauckler, Ludwig J. |
| description | Using diffusing-wave spectroscopy, we followed the aggregation and gelation of concentrated (30 vol%) alumina suspensions. The suspensions were destabilized by either shifting the pH to the isoelectric point or by increasing the ionic strength. Both effects can be achieved continuously and homogeneously by using an enzyme-catalyzed internal chemical reaction. Based on the light-scattering data, we could derive quantitative information about the sol–gel transition and the viscoelastic properties of the gels, as well as a characterization of changes in the microstructure. The elastic moduli determined from light scattering are found to be in good agreement with rheological measurements. |
| doi_str_mv | 10.1006/jcis.2001.7668 |
| format | Article |
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The suspensions were destabilized by either shifting the pH to the isoelectric point or by increasing the ionic strength. Both effects can be achieved continuously and homogeneously by using an enzyme-catalyzed internal chemical reaction. Based on the light-scattering data, we could derive quantitative information about the sol–gel transition and the viscoelastic properties of the gels, as well as a characterization of changes in the microstructure. The elastic moduli determined from light scattering are found to be in good agreement with rheological measurements.</description><identifier>ISSN: 0021-9797</identifier><identifier>EISSN: 1095-7103</identifier><identifier>DOI: 10.1006/jcis.2001.7668</identifier><identifier>PMID: 11502111</identifier><identifier>CODEN: JCISA5</identifier><language>eng</language><publisher>San Diego, CA: Elsevier Inc</publisher><subject>alumina suspensions ; Chemistry ; colloidal dispersions ; Colloidal gels. 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The suspensions were destabilized by either shifting the pH to the isoelectric point or by increasing the ionic strength. Both effects can be achieved continuously and homogeneously by using an enzyme-catalyzed internal chemical reaction. Based on the light-scattering data, we could derive quantitative information about the sol–gel transition and the viscoelastic properties of the gels, as well as a characterization of changes in the microstructure. The elastic moduli determined from light scattering are found to be in good agreement with rheological measurements.</description><subject>alumina suspensions</subject><subject>Chemistry</subject><subject>colloidal dispersions</subject><subject>Colloidal gels. Colloidal sols</subject><subject>Colloidal state and disperse state</subject><subject>diffusing-wave spectroscopy (DWS)</subject><subject>dynamic light scattering</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>granular materials</subject><subject>microrheology</subject><subject>sol–gel transition</subject><issn>0021-9797</issn><issn>1095-7103</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2001</creationdate><recordtype>article</recordtype><recordid>eNp1kE1Lw0AQhhdRbK1ePUougpfE_chukmOpWoVCD1U8LpvNrGxJk7ibFPrv3dCiJ08DM8-8zDwI3RKcEIzF41Zbn1CMSZIJkZ-hKcEFjzOC2TmaYkxJXGRFNkFX3m8DRTgvLtEk1DAiZIrWT9aYwdvmK_5Ue4g2HejetV633SFqTbRoGw1N71QPVTSvh51tVLQZfAeNt23jo2pwYTlaQq360LhGF0bVHm5OdYY-Xp7fF6_xar18W8xXsWYZ7WOmSkIZFpiIFBRlFTGQUSrK0kAOKQBOdcppyaoKDC8UJVqrkuUpF4XQZcZm6OGY27n2ewDfy531GupaNdAOXpKcF4znRIiAJkdUh7-8AyM7Z3fKHSTBcpQoR4lylChHiWHh7pQ9lDuo_vCTtQDcnwDltaqNU82Y8MulmGcpZoHLjxwEE3sLTnptIQitrAuaZdXa_274AT39jkc</recordid><startdate>20010901</startdate><enddate>20010901</enddate><creator>Wyss, Hans M.</creator><creator>Romer, Sara</creator><creator>Scheffold, Frank</creator><creator>Schurtenberger, Peter</creator><creator>Gauckler, Ludwig J.</creator><general>Elsevier Inc</general><general>Elsevier</general><scope>IQODW</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20010901</creationdate><title>Diffusing-Wave Spectroscopy of Concentrated Alumina Suspensions during Gelation</title><author>Wyss, Hans M. ; Romer, Sara ; Scheffold, Frank ; Schurtenberger, Peter ; Gauckler, Ludwig J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c372t-3ab123060164ea23d1fe7226bbfe8e4ee04c452b3ddef59a21ccab3845696cb73</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2001</creationdate><topic>alumina suspensions</topic><topic>Chemistry</topic><topic>colloidal dispersions</topic><topic>Colloidal gels. Colloidal sols</topic><topic>Colloidal state and disperse state</topic><topic>diffusing-wave spectroscopy (DWS)</topic><topic>dynamic light scattering</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>granular materials</topic><topic>microrheology</topic><topic>sol–gel transition</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wyss, Hans M.</creatorcontrib><creatorcontrib>Romer, Sara</creatorcontrib><creatorcontrib>Scheffold, Frank</creatorcontrib><creatorcontrib>Schurtenberger, Peter</creatorcontrib><creatorcontrib>Gauckler, Ludwig J.</creatorcontrib><collection>Pascal-Francis</collection><collection>PubMed</collection><collection>CrossRef</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>Wyss, Hans M.</au><au>Romer, Sara</au><au>Scheffold, Frank</au><au>Schurtenberger, Peter</au><au>Gauckler, Ludwig J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Diffusing-Wave Spectroscopy of Concentrated Alumina Suspensions during Gelation</atitle><jtitle>Journal of colloid and interface science</jtitle><addtitle>J Colloid Interface Sci</addtitle><date>2001-09-01</date><risdate>2001</risdate><volume>241</volume><issue>1</issue><spage>89</spage><epage>97</epage><pages>89-97</pages><issn>0021-9797</issn><eissn>1095-7103</eissn><coden>JCISA5</coden><abstract>Using diffusing-wave spectroscopy, we followed the aggregation and gelation of concentrated (30 vol%) alumina suspensions. The suspensions were destabilized by either shifting the pH to the isoelectric point or by increasing the ionic strength. Both effects can be achieved continuously and homogeneously by using an enzyme-catalyzed internal chemical reaction. Based on the light-scattering data, we could derive quantitative information about the sol–gel transition and the viscoelastic properties of the gels, as well as a characterization of changes in the microstructure. The elastic moduli determined from light scattering are found to be in good agreement with rheological measurements.</abstract><cop>San Diego, CA</cop><pub>Elsevier Inc</pub><pmid>11502111</pmid><doi>10.1006/jcis.2001.7668</doi><tpages>9</tpages></addata></record> |
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| ispartof | Journal of colloid and interface science, 2001-09, Vol.241 (1), p.89-97 |
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| subjects | alumina suspensions Chemistry colloidal dispersions Colloidal gels. Colloidal sols Colloidal state and disperse state diffusing-wave spectroscopy (DWS) dynamic light scattering Exact sciences and technology General and physical chemistry granular materials microrheology sol–gel transition |
| title | Diffusing-Wave Spectroscopy of Concentrated Alumina Suspensions during Gelation |
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