Structure, Diffusion, and Permeability of Protein-Stabilized Monodispersed Oil in Water Emulsions and Their Gels: A Self-Diffusion NMR Study
Artikel i vetenskaplig tidskrift, 2010

Self-diffusion NMR is used to investigate monodispersed oil in water emulsions and the subsequent gel formed by removing the water through evaporation. The radius of the oil droplets in the emulsions is measured using a number of diffusion methods based on the measurement of the mean squared displacement of the oil, water, and tracer molecules. The results are consistent with the known size of the emulsions. Bragg-like reflections due to the restricted diffusion of the water around the oil droplets are observed due to the low polydispersity of the emulsions and the dense packing. The resulting data are fitted to a pore glass model to give the diameter of both the pools of interstitial water and the oil droplets. In the gel, information on the residual three-dimensional structure is obtained using the short time behavior of the effective diffusion coefficient to give the surface to volume ratio of the residual protein network structure. The values for the surface to volume ratio are found tube consistent with the expected increase of the surface area of monodisperse droplets forming a gel network. At long diffusion observation times, the permeability of the network structure is investigated by diffusion NM R to give a complete picture of the colloidal system considered.

DROPLET SIZE

TIME-DEPENDENT DIFFUSION

MICROFLUIDICS

HETEROGENEOUS SYSTEMS

PULSED-FIELD-GRADIENT

TO-VOLUME RATIO

COEFFICIENT

STIMULATED ECHO

PFG-NMR

POROUS-MEDIA

Författare

A. I. Romoscanu

Nestle S.A.

A. Fenollosa

Nestle S.A.

S. Acquistapace

Nestle S.A.

D. Gunes

Nestle S.A.

T. Martins-Deuchande

Nestle S.A.

P. Clausen

Nestle S.A.

R. Mezzenga

Université de Fribourg

Magnus Nydén

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

SuMo Biomaterials

K. Zick

Bruker BioSpin GmbH, Germany

E. Hughes

Nestle S.A.

Langmuir

0743-7463 (ISSN) 1520-5827 (eISSN)

Vol. 26 9 6184-6192

Ämneskategorier

Kemiteknik

DOI

10.1021/la100774q