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Aggregation of lignin derivatives under alkaline conditions. Kinetics and aggregate structure

Norgren, Magnus LU ; Edlund, H and Wagberg, L (2002) In Langmuir 18(7). p.2859-2865
Abstract
The kinetics of kraft lignin (KL) aggregation at alkaline conditions was studied by quasi-elastic light scattering (QELS) and turbidity measurements. Stability ratios (W) for HL were obtained at 70 degreesC and various concentrations of sodium chloride. By analyzing the early-time evolution data of aggregate growth obtained from QELS, fractal dimensions of flocs formed in both reaction-limited cluster-cluster aggregation regimes and diffusion-limited cluster-cluster aggregation regimes were determined. Correlations between the fractal dimension and the W-ratio were found in accordance to recent studies of a system containing monodisperse polystyrene colloids. By cryogenic transmission electron microscopy, the fractality of KL aggregate... (More)
The kinetics of kraft lignin (KL) aggregation at alkaline conditions was studied by quasi-elastic light scattering (QELS) and turbidity measurements. Stability ratios (W) for HL were obtained at 70 degreesC and various concentrations of sodium chloride. By analyzing the early-time evolution data of aggregate growth obtained from QELS, fractal dimensions of flocs formed in both reaction-limited cluster-cluster aggregation regimes and diffusion-limited cluster-cluster aggregation regimes were determined. Correlations between the fractal dimension and the W-ratio were found in accordance to recent studies of a system containing monodisperse polystyrene colloids. By cryogenic transmission electron microscopy, the fractality of KL aggregate structures in the system was also shown. It was seen from stability studies of KL solutions that the effects of specific co- and counterions follow the Hofmeister series. From the outcome of the investigation, different modes of aggregation occurring in a KL system are proposed. Starting from the macromolecular state of KL and evolving through larger aggregates, the KL clusters finally exhibit a supramolecular structure similar to what earlier has been proposed for native softwood lignin. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
18
issue
7
pages
2859 - 2865
publisher
The American Chemical Society
external identifiers
  • wos:000174784400057
  • scopus:0037007336
ISSN
0743-7463
DOI
10.1021/la011627d
language
English
LU publication?
yes
id
d15ad279-4376-4e69-889e-f70bfb8cf9b3 (old id 340586)
date added to LUP
2007-11-19 15:59:22
date last changed
2017-11-12 03:19:35
@article{d15ad279-4376-4e69-889e-f70bfb8cf9b3,
  abstract     = {The kinetics of kraft lignin (KL) aggregation at alkaline conditions was studied by quasi-elastic light scattering (QELS) and turbidity measurements. Stability ratios (W) for HL were obtained at 70 degreesC and various concentrations of sodium chloride. By analyzing the early-time evolution data of aggregate growth obtained from QELS, fractal dimensions of flocs formed in both reaction-limited cluster-cluster aggregation regimes and diffusion-limited cluster-cluster aggregation regimes were determined. Correlations between the fractal dimension and the W-ratio were found in accordance to recent studies of a system containing monodisperse polystyrene colloids. By cryogenic transmission electron microscopy, the fractality of KL aggregate structures in the system was also shown. It was seen from stability studies of KL solutions that the effects of specific co- and counterions follow the Hofmeister series. From the outcome of the investigation, different modes of aggregation occurring in a KL system are proposed. Starting from the macromolecular state of KL and evolving through larger aggregates, the KL clusters finally exhibit a supramolecular structure similar to what earlier has been proposed for native softwood lignin.},
  author       = {Norgren, Magnus and Edlund, H and Wagberg, L},
  issn         = {0743-7463},
  language     = {eng},
  number       = {7},
  pages        = {2859--2865},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Aggregation of lignin derivatives under alkaline conditions. Kinetics and aggregate structure},
  url          = {http://dx.doi.org/10.1021/la011627d},
  volume       = {18},
  year         = {2002},
}