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Charging Poly(methyl Methacrylate) Latexes in Nonpolar Solvents: Effect of Particle Concentration
- Source :
- Langmuir, Smith, G N, Ahualli, S, Delgado, Á V, Gillespie, D A J, Kemp, R, Peach, J, Pegg, J C, Rogers, S E, Shebanova, O, Smith, N & Eastoe, J 2017, ' Charging Poly(methyl Methacrylate) Latexes in Nonpolar Solvents : Effect of Particle Concentration ', Langmuir, vol. 33, no. 47, pp. 13543-13553 . https://doi.org/10.1021/acs.langmuir.7b02257
- Publication Year :
- 2017
-
Abstract
- The electrophoresis of a well-established model system of charged colloids in nonpolar solvents has been studied as a function of particle volume fraction at constant surfactant concentration. Dispersions of poly(12-hydroxystearic acid)-stabilized poly(methyl methacrylate) (PMMA) latexes in dodecane were prepared with added Aerosol OT surfactant as the charging agent. The electrophoretic mobility (μ) of the PMMA latexes is found to decrease with particle concentration. The particles are charged by a small molecule charging agent (AOT) at finite concentration, and this makes the origin of this decrease in μ unclear. There are two suggested explanations. The decrease could either be due to the reservoir of available surfactant being exhausted at high particle concentrations or the interactions between the charged particles at high particle number concentrations. Contrast-variation small-angle neutron scattering measurements of PMMA latexes and deuterated AOT-d34 surfactant in latex core contrast-matched solvent were used to study the former, and electrokinetic modeling was used to study the latter. As the same amount of AOT-d34 is found to be incorporated with the latexes at all volume fractions, the solvodynamic and electrical interactions between particles are determined to be the explanation for the decrease in mobility. These measurements show that, for small latexes, there are interactions between the charged particles at all accessible particle volume fractions and that it is necessary to account for this to accurately determine the electrokinetic ζ potential.
- Subjects :
- Materials science
Particle number
Dodecane
02 engineering and technology
010402 general chemistry
01 natural sciences
chemistry.chemical_compound
Colloid
Pulmonary surfactant
Polymer chemistry
Electrochemistry
General Materials Science
Methyl methacrylate
Spectroscopy
Surfaces and Interfaces
021001 nanoscience & nanotechnology
Condensed Matter Physics
Poly(methyl methacrylate)
Charged particle
0104 chemical sciences
chemistry
Chemical engineering
visual_art
visual_art.visual_art_medium
Particle
0210 nano-technology
Subjects
Details
- ISSN :
- 15205827
- Volume :
- 33
- Issue :
- 47
- Database :
- OpenAIRE
- Journal :
- Langmuir : the ACS journal of surfaces and colloids
- Accession number :
- edsair.doi.dedup.....3f83ac24131816ac743dc7657b52391a
- Full Text :
- https://doi.org/10.1021/acs.langmuir.7b02257