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Osmotic swelling of sodium hectorite in ternary solvent mixtures : Nematic liquid crystals in hydrophobic media

Title data

Mayr, Lina ; Amschler, Sonja ; Edenharter, Andreas ; Dudko, Volodymyr ; Kunz, Raphael ; Rosenfeldt, Sabine ; Breu, Josef:
Osmotic swelling of sodium hectorite in ternary solvent mixtures : Nematic liquid crystals in hydrophobic media.
In: Langmuir. (20 March 2020) .
ISSN 1520-5827
DOI: https://doi.org/10.1021/acs.langmuir.0c00373

Project information

Project title:
Project's official titleProject's id
SFB 1357 MikroplastikSFB1357
SFB 840 - Von partikulären Nanosystemen zur MesotechnologieNo information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Swelling of clay minerals in organic solvents or solvent mixtures is key for the fabrication of polymer nanocomposites with perfectly dispersed filler that contain only individual clay layers. We here investigated the swelling behavior of sodium hectorite in different ternary solvent mixtures containing methanol, acetonitrile, ethylene glycol or glycerol carbonate with a minimum amount of water. We found that in these mixtures, less water is required than in the corresponding binary mixtures to set in complete delamination by repulsive osmotic swelling. A quantitative study of osmotic swelling in a particular ternary mixture resembles swelling behavior in pure water. At hectorite contents larger than 5 vol.-%, the separation of individual layers scales with ϕ-1. At this concentration a crossover is observed and swelling continues at slower pace (ϕ-0.5) below this value.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry I > Chair Inorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Polymer and Colloid Science
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie
Research Institutions > Collaborative Research Centers, Research Unit > SFB 1357 - MIKROPLASTIK
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 500 Natural sciences
500 Science > 540 Chemistry
Date Deposited: 30 Mar 2020 08:27
Last Modified: 30 Mar 2020 08:27
URI: https://eref.uni-bayreuth.de/id/eprint/54711