Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Influence of Cellulose Nanofibers on the Behavior of Pickering Emulsions. Part 1. Microscopy and Startup Flow Test

Shu-Ming Cui
ORCID logo ,
Saud Hashmi
ORCID logo ,
Wen-Qiang Li
,
Stephan Handschuh-Wang
ORCID logo ,
Cheng-Tian Zhu
,
Shi-Chang Wang
,
Pian-Pian Yang
,
Yan-Fei Huang
* ,
Guang-Ming Zhu
* ,
Florian J. Stadler
* ORCID logo
Version 1 : Received: 11 October 2022 / Approved: 12 October 2022 / Online: 12 October 2022 (10:02:56 CEST)

A peer-reviewed article of this Preprint also exists.

Cui, S.-M.; Hashmi, S.; Li, W.-Q.; Handschuh-Wang, S.; Zhu, C.-T.; Wang, S.-C.; Yang, P.-P.; Huang, Y.-F.; Zhu, G.-M.; Stadler, F.J. Influence of Cellulose Nanofibers on the Behavior of Pickering Emulsions. Part 1. Microscopy and Startup Flow Test. Materials 2022, 15, 8285. Cui, S.-M.; Hashmi, S.; Li, W.-Q.; Handschuh-Wang, S.; Zhu, C.-T.; Wang, S.-C.; Yang, P.-P.; Huang, Y.-F.; Zhu, G.-M.; Stadler, F.J. Influence of Cellulose Nanofibers on the Behavior of Pickering Emulsions. Part 1. Microscopy and Startup Flow Test. Materials 2022, 15, 8285.

Abstract

When existing at emulsion interface and continuous phase, dispersibility of water-soluble flexible polymer chains has obvious effect on rheology and dielectric properties of whole emulsion. CNF Pickering emulsion is a good system to research these properties with respect to their microscopic phase structure, dielectric and rheological properties by using cellulose nanofibers (CNF) as water-soluble Pickering emulsifier, liquid Paraffin as oil phase and DDAB as a cationic auxiliary surfactant. The CNF- and DDAB-contents were systematically varied while the water to paraffin oil ratio remained constant to discern the influence of the Pickering emulsifiers. Polarized optical microscopic images revealed that the droplets have tendency to become smaller size for higher CNF content, but bigger size for higher DDAB content, which was proved by the fluorescent analysis for CNF dispersibility with varying DDAB content. The dielectric damping exhibits a minimum, whose value decreases with increasing DDAB- and CNF-content. Increasing the DDAB-content promotes solubilization of CNFs in the aqueous phase and will increase the overall viscosity and yield points. Similarly, a higher CNF-content leads to a higher viscosity and yield point, but at high DDAB-contents the viscosity function exhibits an S-shape at intermediate CNF-content. To evaluate the results further they were compared with CNF-dispersions (without oil-phase), which showed a surfactant effect slightly on maximum stress but strongly on yield stress τy, indicating DDAB can promote the formation of CNF network rather than the viscosity of whole system.

Keywords

cellulose nanofibers; CNF networks; physical entanglement; droplets clusters; startup flow

Subject

Physical Sciences, Fluids and Plasmas Physics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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