TY - JOUR
T1 - Competition between polymers for adsorption on silica
T2 - A solvent relaxation NMR and small-angle neutron scattering study
AU - Cooper, Catherine L.
AU - Cosgrove, Terence
AU - Van Duijneveldt, Jeroen S.
AU - Murray, Martin
AU - Prescott, Stuart W.
PY - 2013/10/15
Y1 - 2013/10/15
N2 - The competition between poly(vinylpyrrolidone) and poly(ethylene oxide) for adsorption at the silica surface was studied by solvent relaxation nuclear magnetic resonance and small-angle neutron scattering. The additive nature of the NMR relaxation rate enhancement was used to observe changes in the train layer when the two polymers were in direct competition for an increasing weight percentage of silica. PVP is shown to displace preadsorbed PEO from the particle surface, and this was observed for a range of PVP molecular weights. SANS measurements were found to give detailed information on the adsorption of the polymers in the separate systems; however, only qualitative information on the adsorption of the polymers could be obtained from the mixed samples. At a total polymer concentration of 0.4% w/v with 1.1% w/v silica, the SANS data were consistent with PVP adsorbing at the surface and dPEO remaining in solution, in agreement with the NMR data.
AB - The competition between poly(vinylpyrrolidone) and poly(ethylene oxide) for adsorption at the silica surface was studied by solvent relaxation nuclear magnetic resonance and small-angle neutron scattering. The additive nature of the NMR relaxation rate enhancement was used to observe changes in the train layer when the two polymers were in direct competition for an increasing weight percentage of silica. PVP is shown to displace preadsorbed PEO from the particle surface, and this was observed for a range of PVP molecular weights. SANS measurements were found to give detailed information on the adsorption of the polymers in the separate systems; however, only qualitative information on the adsorption of the polymers could be obtained from the mixed samples. At a total polymer concentration of 0.4% w/v with 1.1% w/v silica, the SANS data were consistent with PVP adsorbing at the surface and dPEO remaining in solution, in agreement with the NMR data.
UR - http://www.scopus.com/inward/record.url?scp=84886935957&partnerID=8YFLogxK
U2 - 10.1021/la402556g
DO - 10.1021/la402556g
M3 - Article (Academic Journal)
C2 - 24059561
AN - SCOPUS:84886935957
SN - 0743-7463
VL - 29
SP - 12670
EP - 12678
JO - Langmuir
JF - Langmuir
IS - 41
ER -