Scaling trend in diffusion coefficients of low generation G0-G3 PAMAM dendrimers in aqueous solution at high and neutral pH

Verónica A. Jiménez, José A. Gavín, Joel B. Alderete

Resultado de la investigación: Contribución a una revistaArtículo

13 Citas (Scopus)

Resumen

Aqueous solution diffusion coefficients for G0-G3 PAMAM dendrimers were determined from DOSY-NMR spectroscopy at high and neutral pH. The study was performed in a dilute regime and diffusion coefficients at infinite dilution (D 0) were estimated from the variation of diffusion coefficients with dendrimer concentration. Hydrodynamic radii (Rh) for each dendrimer were estimated from D 0 using the Stoke-Einstein relationship at both pH. According to D 0 and R h values, the structure of G0-G1 PAMAM dendrimers is almost insensitive to pH variations, whereas G2-G3 PAMAM dendrimers undergo swelling at neutral pH, due to surface amino groups protonation. Experimental diffusion coefficients show a scaling trend with the number of dendrimer atoms (N), with scaling laws of the type D 0 ∞ N a, where a takes values of -0.39 and -0.50 at pH 12 and 7, respectively. For the first time, experimental data accounts for the scaling behavior of aqueous diffusion coefficients for low generation PAMAM dendrimers, as previously reported from molecular dynamics simulations.

Idioma originalInglés
Páginas (desde-hasta)123-128
Número de páginas6
PublicaciónStructural Chemistry
Volumen23
N.º1
DOI
EstadoPublicada - 1 feb 2012

Áreas temáticas de ASJC Scopus

  • Física de la materia condensada
  • Química física y teórica

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