Scaling analysis of polyacrylamide gel surfaces synthesized in the presence of surfactants

Par Conseil national de recherches du Canada

DOI	Trouver le DOI : https://doi.org/10.1016/S0021-9797(02)00144-3
Auteur	Rechercher : Chakrapani, Mukundan; Rechercher : Mitchell, S. J.; Rechercher : Van Winkle, D. H.; Rechercher : Rikvold, P. A.
Format	Texte, Article
Sujet	Atomic force microscopy (AFM); Complex systems; Percolation transition; Polyacrylamide gels; Scaling analysis; Self-affine scaling; Surfactants
Résumé	Surfaces of polyacrylamide hydrogels synthesized in the presence of surfactants were imaged by atomic force microscopy (AFM), and the surface morphology was studied by numerical scaling analysis. The gels were formed by polymerizing acrylamide plus a cross-linker in the presence of surfactants, which were then removed by soaking in distilled water. Gels formed in the presence of over 20% surfactant (by weight) formed clear, but became opaque upon removal of the surfactants. Other gels formed and remained clear. The surface morphology of the gels was studied by several one- and two-dimensional numerical scaling methods. The surfaces were found to be self-affine on short length scales, with a roughness (Hurst) exponent in the range from 0.85 to 1, crossing over to a constant root-mean-square surface width at long scales. Both the crossover length between these two regimes and the saturation value of the surface width increased significantly with increasing surfactant concentration, coincident with the increase in opacity. We propose that the changes in the surface morphology are due to a percolation transition in the system of voids formed upon removal of the surfactants from the bulk.
Date de publication	2003-02-01
Dans	Journal of Colloid and Interface Science 258, nº 1 (1 février 2003) : 186–197.
Langue	anglais
Publication du CNRC	Cette publication n’est pas du CNRC Ce sont des publications qui ont été rédigées par un auteur du CNRC, mais avant que celui-ci soit employé du CNRC.
Numéro NPARC	12328510
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Identificateur de l’enregistrement	b26041be-ba8a-49ec-bcd2-b6817ff5def4
Enregistrement créé	2009-09-10
Enregistrement modifié	2020-04-02

Date de modification :: 2024-07-22