Influence of alignment and microstructure features on the mechanical properties and failure mechanisms of cellulose nanocrystals (CNC) films

Shishehbor, Mehdi; Son, Hyeyoung; Nuruddin, Md.; Youngblood, Jeffrey P.; Davis, Chelsea S.; Zavattieri, Pablo

doi:10.1016/j.jmbbm.2021.104399

Cited by 16 publications

(13 citation statements)

References 56 publications

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“…41 The moduli of CNC films decreased exponentially as a result of increasing the misalignment between the loading direction and the tensile direction from 0° to 30°, then the modulus slightly increased from 60° to 90° because of the constrained lateral deformation by stiff CNCs. The modulus trend was in good agreement with the simulation results of Shishehbor et al , 16 in which the moduli of the CNC films decreased exponentially as the misalignment increased until 45°, then the moduli of CNC films slightly increased to a misalignment of 90°. Though the measured moduli agreed in trend, the recorded modulus values were slightly lower than those reported in the simulated work since in simulations, both the degree of alignment and CNC width and length distribution could be controlled.…”

Section: Resultssupporting

confidence: 90%

“…Their work showed that when the ordering of CNCs in the film is increased, the elastic modulus increases in the axial direction and decreases in the transverse direction. 10 To identify the fracture mechanisms of CNC films with respect to the angle of alignment, Shishehbor et al 16 investigated the effect of CNC alignment on mechanical properties by developing a coarse-grained (CG) molecular model. In that work, three different fracture mechanisms were predicted through both simulations and analytical solutions.…”

Section: Introductionmentioning

confidence: 99%

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Particle alignment effects on mechanical properties of cellulose nanocrystal thin films

Son

Smith

et al. 2023

Mater. Adv.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Particle alignment effects on mechanical properties of cellulose nanocrystal thin films

Son

Smith

et al. 2023

Mater. Adv.

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“…In contrast, in lap-shear the stresses were homogeneously applied yet resulted in 30% higher strength for the perpendicular samples. These values match surprisingly well, at the macro-scale, the anisotropy for coefficient of friction measured at the nano-scale for CNCs (Chae et al 2020;Shishehbor et al 2021). This further suggests that CNCs are well aligned and that this results in a high unidirectional alignment of the cellulose chain at the glass-cellulose chain interface.…”

Section: Adhesionsupporting

confidence: 75%

Controlling superstructure formation and macro-scale adhesion via confined evaporation of cellulose nanocrystals

et al. 2022

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The self-assembly of cellulose nanocrystals can tether their interfacial interactions and the associated properties of their constructs. For instance, assemblies of highly aligned cellulose nanocrystals (CNCs) bear improved mechanical strength, barrier properties, and piezoelectric response. In this study, the self-assembly of CNC superstructure was assessed under various confinement geometries, enabling optimization of the long-range order within the microstructures formed. The confinement involved the planar capillary (with a rectangular cross-section)formed between two glass substrates with silicone boundaries. The impact of temperature, width and thickness of the capillary plane on self-assembly of the micro-scaled lamellar structures was evaluated. Thinner capillaries and lower temperatures were found to considerably improve long-range order and increase the frequency of the periodic microstructures formed. The drying process was monitored by rheological analysis, which showed an initial fast drying followed by slow drying due to the hindered diffusion through lamellae. The adhesive properties of the formed superstructures were evaluated. The shear strength was shown to depend on the orientation of the superstructures and therefore of the CNCs. About 4 MPa adhesion strength was obtained when the lamellar superstructures were perpendicularly aligned with respect to the in-plane force applied, while ca. 3 MPa adhesion was obtained for parallel alignment. The experimental framework described herein enabled the evaluation of the impact of the dimensions of a drying meniscus on self-assembly of anisometric colloids while also linking cellulosic assemblies with their interfacial supramolecular interactions. This simple framework brings forward the possibility to correlate the behavior of nanometric objects with micro- and macro-scaled observations, e.g., macro-scaled mechanics of adhesion.

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“…Such a hypothesis is corroborated by the fact that an increased order and alignment is known to increase the mechanical properties of anisotropic particle assemblies. 35 …”

Section: Resultsmentioning

confidence: 99%

Chitin–amyloid synergism and their use as sustainable structural adhesives

et al. 2021

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Influence of alignment and microstructure features on the mechanical properties and failure mechanisms of cellulose nanocrystals (CNC) films

Cited by 16 publications

References 56 publications

Particle alignment effects on mechanical properties of cellulose nanocrystal thin films

Particle alignment effects on mechanical properties of cellulose nanocrystal thin films

Controlling superstructure formation and macro-scale adhesion via confined evaporation of cellulose nanocrystals

Chitin–amyloid synergism and their use as sustainable structural adhesives

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