Exploring the gelation of aqueous cellulose nanocrystals (CNCs)-hydroxyethyl cellulose (HEC) mixtures

Stolz, Jonathan; Oğuzlu, Hale; Khalili, Zahra; Boluk, Yaman

doi:10.1007/s00397-021-01285-1

Cited by 14 publications

(4 citation statements)

References 56 publications

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“…These supplementary junctions dissipated more energy into the network (hence the transient increase of G ″). Such overshoots were also observed in various CNC-based systems, such as salt-induced CNC gels or CNCs interacting with various soluble polymers. − Outside of the network model, this was interpreted to be related to the existence of flocs of particles, reorganizing under shear. This is highly consistent with the structures we described as only XG40 was able to form flocs of bridged CNCs.…”

Section: Resultsmentioning

confidence: 87%

Influence of Low-Molar-Mass Xyloglucans on the Rheological Behavior of Concentrated Cellulose Nanocrystal Suspensions

et al. 2022

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Hydrogels were prepared at high solid contents (70−100 g/L) with cellulose nanocrystals (CNC) and very short xyloglucans (XGs). At 70 g/L, CNCs form cholesteric liquid crystals regularly spaced by a distance of 30 nm. This structure was preserved after adsorption of XG with a molar mass (M w ) of 20,000 g/mol (XG20) but was lost at 40,000 g/mol (XG40). Rheological measurements discriminated domains where an increasing M w from XG20 to XG40 gave rise to drastic changes in storage moduli (on 3 orders of magnitude). At 40,000 g/mol, transient systems were obtained and a re-entrant glass−gel−glass transition was observed with increasing XG concentrations. This was interpreted in terms of the length and stiffness of the chain in relation to the inter-CNC distance. Liquid-to-glass-to-gel transitions were attributed to an XG adsorption type according to train or trail conformations or interconnected structures. Such tunable properties may further have implications on the in vivo role of XG during cell wall extension.

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Section: Resultsmentioning

confidence: 87%

Influence of Low-Molar-Mass Xyloglucans on the Rheological Behavior of Concentrated Cellulose Nanocrystal Suspensions

et al. 2022

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“…Then stress, strain, and time data are analyzed to determine the nonlinear viscoelastic coefficients of the material. Well-defined nonlinear test protocols for LAOS are given by Hyun et al [97] and Ewoldt et al [98] and applied to test hydrogels and other complex fluids [99][100][101]. Unfortunately, there are no collagen hydrogels measurements by using full test protocols of LAOS.…”

Section: Laosmentioning

confidence: 99%

Rheological and viscoelastic properties of collagens and their role in bioprinting by micro-extrusion

Lan¹,

Adesida²,

Boluk³

2022

Biomed. Mater.

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This article aims to understand the rheology of collagen networks and their role in various stages of a bioprinting process while building tissue-like constructs. The science of rheology, which deals with the deformation and flow of matter, has grown considerably from its earlier focus on polymer melts and solutions and their processing methods to hydrogels with new processing procedures, such as bioprinting. The main objective of this paper is to discuss the impact of the rheology of collagen hydrogels on micro-extrusio and layer stacking stages of bioprinting. Generally, the rheological characterization of hydrogels, including collagens by dynamic measurements under small deformations, is considered sufficient to evaluate their bioprinting performance. However, we brought out the importance of other rheological properties of collagen networks such as steady-state shear flow conditions and large amplitude oscillator shear. While the dynamic measurements under small deformations are useful for characterizing the crosslinking and gel formations of the collagen, the steady shear flow measurements are better tools for investigating filament micro-extrusion and layer-stacking stages of a bioprinting process. We brought the role of other non-Newtonian material functions, such as first normal stress difference and extensional viscosity in addition to shear viscosity, for the first time. Extensional viscosity and the viscoelasticity manifested through normal-stress differences are significant in capillary (needle) flow. We also suggested caution to use of dynamic viscosity vs. oscillation frequency under small deformations in the place of steady shear viscosity vs. shear rate measurement. In addition, we brought out the importance of the large amplitude oscillatory shear test to investigate the collagen networks under large deformations. Finally, we discussed the role of crosslinking and flow conditions on cell viability. Those discussions are focused on collagen networks; nevertheless, they are valid on the bioprinting of other hydrogels.

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“…In response to these challenges, our study presents a novel approach using hydroxyethyl cellulose (HEC) [ 29 , 30 ], which exhibits very similar RI (1.345) as water (1.333) and MS solution (1.340) [ 31 ], to create a natural hydrogel-based super-transparent soil (s-TS). This s-TS allows for plant culture in natural conditions while maintaining 89.5% light transmittance after a two-month culture cycle.…”

Section: Introductionmentioning

confidence: 99%

Super-Transparent Soil for In Situ Observation of Root Phenotypes

Xie,

Wu,

Feng

et al. 2024

Molecules

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Transparent soil (TS) presents immense potential for root phenotyping due to its ability to facilitate high-resolution imaging. However, challenges related to transparency, mechanical properties, and cost hinder its development. Herein, we introduce super-transparent soil (s-TS) prepared via the droplet method using low acyl gellan gum and hydroxyethyl cellulose crosslinked with magnesium ions. The refractive index of the hydroxyethyl cellulose solution (1.345) closely aligns with that of water (1.333) and the low acyl gellan gum solution (1.340), thereby significantly enhancing the transmittance of hydrogel-based transparent soil. Optimal transmittance (98.45%) is achieved with polymer concentrations ranging from 0.8 to 1.6 wt.% and ion concentrations between 0.01 and 0.09 mol·L−1. After 60 days of plant cultivation, s-TS maintains a transmittance exceeding 89.5%, enabling the detailed visualization of root growth dynamics. Furthermore, s-TS exhibits remarkable mechanical properties, withstanding a maximum compressive stress of 477 kPa and supporting a maximum load-bearing depth of 186 cm. This innovative approach holds promising implications for advanced root phenotyping studies, fostering the investigation of root heterogeneity and the development of selective expression under controlled conditions.

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Exploring the gelation of aqueous cellulose nanocrystals (CNCs)-hydroxyethyl cellulose (HEC) mixtures

Cited by 14 publications

References 56 publications

Influence of Low-Molar-Mass Xyloglucans on the Rheological Behavior of Concentrated Cellulose Nanocrystal Suspensions

Influence of Low-Molar-Mass Xyloglucans on the Rheological Behavior of Concentrated Cellulose Nanocrystal Suspensions

Rheological and viscoelastic properties of collagens and their role in bioprinting by micro-extrusion

Super-Transparent Soil for In Situ Observation of Root Phenotypes

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