Forces between Colloid Particles in Natural Waters
The origin and nature of interparticle forces acting on colloid surfaces in natural waters has been examined using an atomic force microscope. Natural colloids were represented by a surface film of iron oxide precipitated onto spherical SiO2 particles, and the effects of adsorbed natural organic mat...
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| Veröffentlicht in: | Environmental science & technology 2003-08, Vol.37 (15), p.3303-3308 |
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| creator | Mosley, Luke M Hunter, Keith A Ducker, William A |
| description | The origin and nature of interparticle forces acting on colloid surfaces in natural waters has been examined using an atomic force microscope. Natural colloids were represented by a surface film of iron oxide precipitated onto spherical SiO2 particles, and the effects of adsorbed natural organic matter (NOM), solution pH, and ionic composition on the force−separation curves were investigated. NOM from both riverine and marine environments was strongly adsorbed to the iron oxide surface. Under conditions of low ionic strength, the interparticle forces were dominated by electrostatic repulsion arising from negative functional groups on the NOM, except at very small separations ( |
| doi_str_mv | 10.1021/es026216d |
| format | Article |
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Natural colloids were represented by a surface film of iron oxide precipitated onto spherical SiO2 particles, and the effects of adsorbed natural organic matter (NOM), solution pH, and ionic composition on the force−separation curves were investigated. NOM from both riverine and marine environments was strongly adsorbed to the iron oxide surface. Under conditions of low ionic strength, the interparticle forces were dominated by electrostatic repulsion arising from negative functional groups on the NOM, except at very small separations (<10 nm) where repulsive forces arising from steric interference of the NOM molecules were also present. At high ionic strength (e.g., seawater) or low pH, the electrostatic forces were largely absent, allowing steric repulsion forces to dominate. In addition, adhesive bridging between surfaces by adsorbed NOM was observed, creating a strong energy barrier to spontaneous disag gregation of colloid aggregates. Our results demonstrate that adsorbed NOM dominates the surface forces and thus stability with respect to aggregation of natural water colloids.</description><identifier>ISSN: 0013-936X</identifier><identifier>EISSN: 1520-5851</identifier><identifier>DOI: 10.1021/es026216d</identifier><identifier>PMID: 12966974</identifier><identifier>CODEN: ESTHAG</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>Adsorption ; Chemical Phenomena ; Chemical Precipitation ; Chemistry, Physical ; Colloids - chemistry ; Earth sciences ; Earth, ocean, space ; Environmental cleanup ; Exact sciences and technology ; External geophysics ; Ferric Compounds - chemistry ; Geochemistry ; Hydrology ; Hydrology. 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Sci. Technol</addtitle><description>The origin and nature of interparticle forces acting on colloid surfaces in natural waters has been examined using an atomic force microscope. Natural colloids were represented by a surface film of iron oxide precipitated onto spherical SiO2 particles, and the effects of adsorbed natural organic matter (NOM), solution pH, and ionic composition on the force−separation curves were investigated. NOM from both riverine and marine environments was strongly adsorbed to the iron oxide surface. Under conditions of low ionic strength, the interparticle forces were dominated by electrostatic repulsion arising from negative functional groups on the NOM, except at very small separations (<10 nm) where repulsive forces arising from steric interference of the NOM molecules were also present. At high ionic strength (e.g., seawater) or low pH, the electrostatic forces were largely absent, allowing steric repulsion forces to dominate. In addition, adhesive bridging between surfaces by adsorbed NOM was observed, creating a strong energy barrier to spontaneous disag gregation of colloid aggregates. Our results demonstrate that adsorbed NOM dominates the surface forces and thus stability with respect to aggregation of natural water colloids.</description><subject>Adsorption</subject><subject>Chemical Phenomena</subject><subject>Chemical Precipitation</subject><subject>Chemistry, Physical</subject><subject>Colloids - chemistry</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Environmental cleanup</subject><subject>Exact sciences and technology</subject><subject>External geophysics</subject><subject>Ferric Compounds - chemistry</subject><subject>Geochemistry</subject><subject>Hydrology</subject><subject>Hydrology. Hydrogeology</subject><subject>Ions</subject><subject>Microscopes</subject><subject>Microscopy, Atomic Force</subject><subject>Mineralogy</subject><subject>Physical and chemical properties of sea water</subject><subject>Physics of the oceans</subject><subject>Silicates</subject><subject>Solubility</subject><subject>Water geochemistry</subject><subject>Water Pollutants - analysis</subject><subject>Water pollution</subject><issn>0013-936X</issn><issn>1520-5851</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2003</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpl0F1LwzAUBuAgis6PC_-AFEHBi-pJ2mTNpcxvhk6dKN6Ek49CtWtn0qL-eysbG-hVLs7Dm3NeQnYpHFNg9MQFYIJRYVdIj3IGMc84XSU9AJrEMhEvG2QzhDcAYAlk62SDMimE7Kc9wi5qb1yItGs-nauiQV2WdWGjEfqmMGU3KaroFpvWYxk9Y-N82CZrOZbB7czfLfJ0cT4eXMXDu8vrwekwRg5JEzMrE51CCppxmyYUtGU8Z6nOJTqLUiOC4VbrVEuLfSGt5dRyAzy13DFItsjhLHfq64_WhUZNimBcWWLl6jYoKhnNhMg6uP8HvtWtr7rdVHcvZRnI37SjGTK-DsG7XE19MUH_rSio3xbVosXO7s0DWz1xdinntXXgYA4wGCxzj5UpwtJxSLuPeefimStC474Wc_TvSvSTPlfj0aN6fs1u7m_Ygzpb5qIJyyP-L_gDTq6TSg</recordid><startdate>20030801</startdate><enddate>20030801</enddate><creator>Mosley, Luke M</creator><creator>Hunter, Keith A</creator><creator>Ducker, William A</creator><general>American Chemical Society</general><scope>BSCLL</scope><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>7QO</scope><scope>7ST</scope><scope>7T7</scope><scope>7U7</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>P64</scope><scope>SOI</scope><scope>7QH</scope><scope>7UA</scope></search><sort><creationdate>20030801</creationdate><title>Forces between Colloid Particles in Natural Waters</title><author>Mosley, Luke M ; Hunter, Keith A ; Ducker, William A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a503t-2d93b4040b25d4310bd25f24bf9aeda9baa0c5dbb4b9da769dd51d5c054d5e203</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2003</creationdate><topic>Adsorption</topic><topic>Chemical Phenomena</topic><topic>Chemical Precipitation</topic><topic>Chemistry, Physical</topic><topic>Colloids - chemistry</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Environmental cleanup</topic><topic>Exact sciences and technology</topic><topic>External geophysics</topic><topic>Ferric Compounds - chemistry</topic><topic>Geochemistry</topic><topic>Hydrology</topic><topic>Hydrology. Hydrogeology</topic><topic>Ions</topic><topic>Microscopes</topic><topic>Microscopy, Atomic Force</topic><topic>Mineralogy</topic><topic>Physical and chemical properties of sea water</topic><topic>Physics of the oceans</topic><topic>Silicates</topic><topic>Solubility</topic><topic>Water geochemistry</topic><topic>Water Pollutants - analysis</topic><topic>Water pollution</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Mosley, Luke M</creatorcontrib><creatorcontrib>Hunter, Keith A</creatorcontrib><creatorcontrib>Ducker, William A</creatorcontrib><collection>Istex</collection><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>Biotechnology Research Abstracts</collection><collection>Environment Abstracts</collection><collection>Industrial and Applied Microbiology Abstracts (Microbiology A)</collection><collection>Toxicology Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Environment Abstracts</collection><collection>Aqualine</collection><collection>Water Resources Abstracts</collection><jtitle>Environmental science & technology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Mosley, Luke M</au><au>Hunter, Keith A</au><au>Ducker, William A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Forces between Colloid Particles in Natural Waters</atitle><jtitle>Environmental science & technology</jtitle><addtitle>Environ. Sci. Technol</addtitle><date>2003-08-01</date><risdate>2003</risdate><volume>37</volume><issue>15</issue><spage>3303</spage><epage>3308</epage><pages>3303-3308</pages><issn>0013-936X</issn><eissn>1520-5851</eissn><coden>ESTHAG</coden><abstract>The origin and nature of interparticle forces acting on colloid surfaces in natural waters has been examined using an atomic force microscope. Natural colloids were represented by a surface film of iron oxide precipitated onto spherical SiO2 particles, and the effects of adsorbed natural organic matter (NOM), solution pH, and ionic composition on the force−separation curves were investigated. NOM from both riverine and marine environments was strongly adsorbed to the iron oxide surface. Under conditions of low ionic strength, the interparticle forces were dominated by electrostatic repulsion arising from negative functional groups on the NOM, except at very small separations (<10 nm) where repulsive forces arising from steric interference of the NOM molecules were also present. At high ionic strength (e.g., seawater) or low pH, the electrostatic forces were largely absent, allowing steric repulsion forces to dominate. In addition, adhesive bridging between surfaces by adsorbed NOM was observed, creating a strong energy barrier to spontaneous disag gregation of colloid aggregates. Our results demonstrate that adsorbed NOM dominates the surface forces and thus stability with respect to aggregation of natural water colloids.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>12966974</pmid><doi>10.1021/es026216d</doi><tpages>6</tpages></addata></record> |
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| subjects | Adsorption Chemical Phenomena Chemical Precipitation Chemistry, Physical Colloids - chemistry Earth sciences Earth, ocean, space Environmental cleanup Exact sciences and technology External geophysics Ferric Compounds - chemistry Geochemistry Hydrology Hydrology. Hydrogeology Ions Microscopes Microscopy, Atomic Force Mineralogy Physical and chemical properties of sea water Physics of the oceans Silicates Solubility Water geochemistry Water Pollutants - analysis Water pollution |
| title | Forces between Colloid Particles in Natural Waters |
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