Steady Shear Rheology of Suspensions of Mixtures of Starch Nanoparticles and Cellulose Nanocrystals
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View abstract on PubMed
Summary
This summary is machine-generated.This study explored the rheology of cellulose nanocrystal (NCC) and starch nanoparticle (SNP) mixtures. Results show these suspensions exhibit shear-thinning behavior, with properties strongly influenced by NCC concentration.
Area Of Science
- Materials Science
- Colloid and Surface Chemistry
- Rheology
Background
- Cellulose nanocrystals (NCCs) and starch nanoparticles (SNPs) are nanomaterials with diverse applications.
- Understanding the rheological properties of their suspensions is crucial for processing and application.
- Mixtures of different nanoparticles can exhibit unique flow behaviors.
Purpose Of The Study
- To investigate the steady shear rheology of suspensions containing mixtures of cellulose nanocrystals (NCCs) and starch nanoparticles (SNPs).
- To determine how varying concentrations of NCCs and SNPs affect the flow behavior of these hybrid suspensions.
- To model the viscous behavior using established rheological models and analyze the governing parameters.
Main Methods
- Experimental investigation of steady shear rheology.
- Systematic variation of cellulose nanocrystal (NCC) concentrations (1-6.7 wt%) and starch nanoparticle (SNP) concentrations (5-30 wt%).
- Analysis of rheological data using the power-law model to determine consistency index and flow behavior index.
Main Results
- The suspensions exhibited pseudoplastic (shear-thinning) behavior across all tested concentrations.
- The power-law model adequately described the viscous behavior of the NCC-SNP mixtures.
- Both consistency index and flow behavior index were dependent on NCC and SNP concentrations.
- The consistency index increased significantly with higher concentrations of both nanoparticles.
- The flow behavior index decreased with increasing concentrations, indicating enhanced shear-thinning.
- The influence of NCC concentration on rheological parameters was significantly stronger than that of SNP concentration.
Conclusions
- Suspensions of mixed cellulose nanocrystals and starch nanoparticles display predictable shear-thinning behavior.
- The rheological properties are tunable by adjusting the concentrations of both NCCs and SNPs.
- Cellulose nanocrystals play a dominant role in dictating the rheological response of these hybrid suspensions.
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