Electrostatically controlled swelling and adsorption of polyelectrolyte brush-grafted nanoparticles to the solid/liquid interface.
Identifieur interne : 003085 ( Main/Exploration ); précédent : 003084; suivant : 003086Electrostatically controlled swelling and adsorption of polyelectrolyte brush-grafted nanoparticles to the solid/liquid interface.
Auteurs : John K. Riley [États-Unis] ; Krzysztof Matyjaszewski ; Robert D. TiltonSource :
- Langmuir : the ACS journal of surfaces and colloids [ 1520-5827 ] ; 2014.
Descripteurs français
- KwdFr :
- MESH :
English descriptors
- KwdEn :
- MESH :
- chemical , chemistry : Electrolytes, Methacrylates, Nylons, Silicon Dioxide, Sodium Chloride.
- chemistry : Nanoparticles.
- Adsorption, Hydrogen-Ion Concentration, Particle Size, Solutions, Static Electricity, Surface Properties.
Abstract
Adsorption of 20 nm diameter silica nanoparticles grafted with a high density brush of the weak polymeric base poly(2-(dimethylamino)ethyl methacrylate) (SiO2-g-PDMAEMA) to the silica/aqueous interface was investigated using ellipsometry and streaming potential measurements. We measured SiO2-g-PDMAEMA adsorption to negatively charged silica surfaces in 1-100 mM sodium chloride solutions in the pH range 5-10 to investigate the role of electrostatics in the adsorption mechanism. In this system pH and ionic strength determine not only the charge density of the silica adsorption substrate but also the degree of ionization and swelling of the PDMAEMA brushes on the nanoparticles, resulting in nonmonotonic dependences of the extent of adsorption on pH and ionic strength. SiO2-g-PDMAEMA displays significantly different adsorption behavior from the linear PDMAEMA analogue, most notably in terms of a strongly hysteretic adsorption response to altered pH and a greater tendency to adsorb under weak surface attraction conditions that prevail at high pH.
DOI: 10.1021/la500570u
PubMed: 24660872
Affiliations:
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Riley</name><affiliation wicri:level="1"><nlm:affiliation>Center for Complex Fluids Engineering, †Department of Chemical Engineering, ‡Department of Chemistry, and §Department of Biomedical Engineering, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Center for Complex Fluids Engineering, †Department of Chemical Engineering, ‡Department of Chemistry, and §Department of Biomedical Engineering, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213</wicri:regionArea><wicri:noRegion>Pennsylvania 15213</wicri:noRegion></affiliation></author><author><name sortKey="Matyjaszewski, Krzysztof" sort="Matyjaszewski, Krzysztof" uniqKey="Matyjaszewski K" first="Krzysztof" last="Matyjaszewski">Krzysztof Matyjaszewski</name></author><author><name sortKey="Tilton, Robert D" sort="Tilton, Robert D" uniqKey="Tilton R" first="Robert D" last="Tilton">Robert D. Tilton</name></author></analytic><series><title level="j">Langmuir : the ACS journal of surfaces and colloids</title><idno type="eISSN">1520-5827</idno><imprint><date when="2014" type="published">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adsorption</term><term>Electrolytes (chemistry)</term><term>Hydrogen-Ion Concentration</term><term>Methacrylates (chemistry)</term><term>Nanoparticles (chemistry)</term><term>Nylons (chemistry)</term><term>Particle Size</term><term>Silicon Dioxide (chemistry)</term><term>Sodium Chloride (chemistry)</term><term>Solutions</term><term>Static Electricity</term><term>Surface Properties</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Adsorption</term><term>Chlorure de sodium ()</term><term>Concentration en ions d'hydrogène</term><term>Méthacrylates ()</term><term>Nanoparticules ()</term><term>Nylons ()</term><term>Propriétés de surface</term><term>Silice ()</term><term>Solutions</term><term>Taille de particule</term><term>Électricité statique</term><term>Électrolytes ()</term></keywords><keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Electrolytes</term><term>Methacrylates</term><term>Nylons</term><term>Silicon Dioxide</term><term>Sodium Chloride</term></keywords><keywords scheme="MESH" qualifier="chemistry" xml:lang="en"><term>Nanoparticles</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Adsorption</term><term>Hydrogen-Ion Concentration</term><term>Particle Size</term><term>Solutions</term><term>Static Electricity</term><term>Surface Properties</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Adsorption</term><term>Chlorure de sodium</term><term>Concentration en ions d'hydrogène</term><term>Méthacrylates</term><term>Nanoparticules</term><term>Nylons</term><term>Propriétés de surface</term><term>Silice</term><term>Solutions</term><term>Taille de particule</term><term>Électricité statique</term><term>Électrolytes</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Adsorption of 20 nm diameter silica nanoparticles grafted with a high density brush of the weak polymeric base poly(2-(dimethylamino)ethyl methacrylate) (SiO2-g-PDMAEMA) to the silica/aqueous interface was investigated using ellipsometry and streaming potential measurements. We measured SiO2-g-PDMAEMA adsorption to negatively charged silica surfaces in 1-100 mM sodium chloride solutions in the pH range 5-10 to investigate the role of electrostatics in the adsorption mechanism. In this system pH and ionic strength determine not only the charge density of the silica adsorption substrate but also the degree of ionization and swelling of the PDMAEMA brushes on the nanoparticles, resulting in nonmonotonic dependences of the extent of adsorption on pH and ionic strength. SiO2-g-PDMAEMA displays significantly different adsorption behavior from the linear PDMAEMA analogue, most notably in terms of a strongly hysteretic adsorption response to altered pH and a greater tendency to adsorb under weak surface attraction conditions that prevail at high pH.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country></list><tree><noCountry><name sortKey="Matyjaszewski, Krzysztof" sort="Matyjaszewski, Krzysztof" uniqKey="Matyjaszewski K" first="Krzysztof" last="Matyjaszewski">Krzysztof Matyjaszewski</name><name sortKey="Tilton, Robert D" sort="Tilton, Robert D" uniqKey="Tilton R" first="Robert D" last="Tilton">Robert D. Tilton</name></noCountry><country name="États-Unis"><noRegion><name sortKey="Riley, John K" sort="Riley, John K" uniqKey="Riley J" first="John K" last="Riley">John K. Riley</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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