Heterogeneity of Network Structures and Water Dynamics in κ-Carrageenan Gels Probed by Nanoparticle Diffusometry
Artikel i vetenskaplig tidskrift, 2018

A set of functionalized nanoparticles (PEGylated dendrimers, d = 2.8-11 nm) was used to probe the structural heterogeneity in Na+/K+ induced κ-carrageenan gels. The self-diffusion behavior of these nanoparticles as observed by 1H pulsed-field gradient NMR, fluorescence recovery after photobleaching, and raster image correlation spectroscopy revealed a fast and a slow component, pointing toward microstructural heterogeneity in the gel network. The self-diffusion behavior of the faster nanoparticles could be modeled with obstruction by a coarse network (average mesh size <100 nm), while the slower-diffusing nanoparticles are trapped in a dense network (lower mesh size limit of 4.6 nm). Overhauser dynamic nuclear polarization-enhanced NMR relaxometry revealed a reduced local solvent water diffusivity near 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO)-labeled nanoparticles trapped in the dense network, showing that heterogeneity in the physical network is also reflected in heterogeneous self-diffusivity of water. The observed heterogeneity in mesh sizes and in water self-diffusivity is of interest for understanding and modeling of transport through and release of solutes from heterogeneous biopolymer gels.

Författare

Daan W. De Kort

Wageningen University and Research Centre

TI-COAST

E. Schuster

SuMo Biomaterials

RISE Research Institutes of Sweden

Freek J.M. Hoeben

TI-COAST

SyMO-Chem B.V.

Ryan Barnes

University of California

Meike Emondts

University of California

Henk M. Janssen

TI-COAST

SyMO-Chem B.V.

Niklas Lorén

RISE Research Institutes of Sweden

SuMo Biomaterials

Chalmers, Fysik, Eva Olsson Group

Songi Han

University of California

Henk Van As

Wageningen University and Research Centre

TI-COAST

John P.M. Van Duynhoven

Wageningen University and Research Centre

TI-COAST

Unilever R and D

Langmuir

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

Vol. 34 37 11110-11120

Ämneskategorier

Fysikalisk kemi

Annan kemi

Biofysik

Styrkeområden

Materialvetenskap

DOI

10.1021/acs.langmuir.8b01052

Mer information

Senast uppdaterat

2018-09-28