Nanoscale Assembly of Cellulose Nanocrystals during Drying and Redispersion

Liu, Yingxin; Stoeckel, Daniela; Gordeyeva, Korneliya; Agthe, Michael; Schütz, Christina; Fall, Andreas; Bergström, Lennart

doi:10.1021/acsmacrolett.7b00964

Cited by 38 publications

(45 citation statements)

References 35 publications

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“…CNC and CNF can assemble into variety of different configurations (Kontturi et al 2018;Lagerwall et al 2014;Ding et al 2014;Orts et al 1998;Benselfelt et al 2019;Lombardo et al 2019;Honorato-Rios et al 2018). CNC can also self-assemble into chiral nematic phases which possess interesting photonic properties and may have applications as optical material (Schütz et al 2015;Surov et al 2017;Liu et al 2019Liu et al , 2018Pospisil et al 2018;Bertsch et al 2019;Parker et al 2016;Yao et al 2017). The reflected wavelengths of the chiral nematic phases are depended of the pitch (p) of the self-assembled CNC.…”

Section: Introductionmentioning

confidence: 99%

A novel supra coarse-grained model for cellulose

et al. 2020

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Cellulose being the most widely available biopolymer on Earth is attracting significant interest from the industry and research communities. While molecular simulations can be used to understand fundamental aspects of cellulose nanocrystal selfassembly, a model that can perform on the experimental scale is currently missing. In our study we develop a supra coarse-grained (sCG) model of cellulose nanocrystal which aims to bridge the gap between molecular simulations and experiments. The sCG model is based on atomistic molecular dynamics simulations and it is developed with the forcematching coarse-graining procedure. The validity of the model is shown through comparison with experimental and simulation results of the elastic modulus, self-diffusion coefficients and cellulose fiber twisting angle. We also present two representative case studies, self-assembly of nanocrystal during solvent evaporation and simulation of a chiral nematic phase ordering. Finally, we discuss possible future applications for our model.

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Section: Introductionmentioning

confidence: 99%

A novel supra coarse-grained model for cellulose

et al. 2020

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“…Generally, when a system is compressed isotropically in 3D, the separation distance will decrease as % <9/Q . 32 According to the fitting results, the exponent of ξ (-0.35) is very close to the -1/3. Considering the nematic phases are randomly oriented in 3D to a large extent in our system, the decrease of ξ reflects a reduction of fiber to fiber distance in the nematic phase, which is equivalent to the isotropic shrinkage of a general 3D CNF network.…”

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confidence: 61%

Inducing Nematic Ordering of Cellulose Nanofibers using Osmotic Dehydration

Guccini¹,

Yu²,

Agthe³

et al. 2018

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The formation of nematically-ordered cellulose nanofiber (CNF) materials with an order parameter fmax ≈ 0.8 is studied by polarized optical microscopy, small-angle x-ray scattering (SAXS), and rheological measurements as a function of CNF concentration. The wide range of CNF concentrations, from 0.5 wt% to 4.9 wt%, is obtained using osmotic dehydration with poly(ethylene glycol). The rheological measurements show a strong entangled network over all the concentration range whereas SAXS measurements indicate that at concentrations >1.05 wt% the CNF suspension crosses an isotropic-anisotropic transition that is accompanied by a dramatic increase of the optical birefringence. The resulting nanostructures are modelled as mass fractal structures that converge into co-existing nematically-ordered regions and network-like regions where the correlation distances decrease with concentration. The use of rapid, upscalable osmotic dehydration is an effective method to increase the concentration of CNF suspensions while partly circumventing the gel formation. The facile formation of highly ordered fibers can result in materials with interesting macroscopic properties. with the flow field orientation of cellulose as there is also a unidirectional removal of water. OD has been widely used to dehydrate food at industrial level, 15,16 desalination, purification and biofuel separation and it shares. 17

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“…The intriguing capability of CNCs to self‐assemble into chiral nematic iridescent films with a helical structure and their photonic properties and applications have attracted increasing attention . Many research efforts have been put on the control of their optical properties .…”

Section: Introductionmentioning

confidence: 99%

“…The cholesteric liquid crystalline phase formed by CNCs has been used as a template to synthesize novel chiral materials for advanced optical applications. [11b,20] Most recently, Xu et al reported that chiral photonic CNC films can be used for ultrasecure polarization‐based encryption, which will pave the way to develop the next‐generation advanced photonic devices . Although some researchers have used different acid especially the mineral acid to obtain the CNCs, to the best of our knowledge, so far no one has reported the direct use of the synergistic effect of mineral sulfuric acid coupling organic acid hydrolysis to tailor the chiral nematic structure of CNC iridescent films.…”

Section: Introductionmentioning

confidence: 99%

Tuning Chiral Nematic Pitch of Bioresourced Photonic Films via Coupling Organic Acid Hydrolysis

Cheng

et al. 2019

Adv Materials Inter

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Controlling the iridescent photonic film generated by self‐assembly of colorless cellulose nanocrystal (CNC) from the nanoscale to macroscale is challenging. This study combines experimental and computational approaches to systematically investigate the correlation between electrostatic interactions and chiral nematic structures. The chiral nematic order of the CNC colloidal is preserved in solid films after the evaporation of water. The cross‐sections of the iridescent film show a clear left‐handed helical arrangement of nanocrystals. The helical structure with the aid of acrylic acid exhibits longer organized patterns. This work reveals that compared to CNC prepared by pure sulfuric acid (zeta potential −37.1 mV), the CNC prepared using coupled mineral sulfuric and organic acrylic acid has a higher zeta potential (−67.2 mV), which induces the increase of helical pitch of the cholesteric nematic phase from 312 to 409 nm and a red shift of the iridescent film. Consequently, the tuning of reflected light wavelength lies in the variation of chiral nematic pitch inside the layered structure, which gives rise to different iridescent colors. The bioresourced photonic film is appealing to both academia and industry where optical and photonic components are essential.

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Nanoscale Assembly of Cellulose Nanocrystals during Drying and Redispersion

Cited by 38 publications

References 35 publications

A novel supra coarse-grained model for cellulose

A novel supra coarse-grained model for cellulose

Inducing Nematic Ordering of Cellulose Nanofibers using Osmotic Dehydration

Tuning Chiral Nematic Pitch of Bioresourced Photonic Films via Coupling Organic Acid Hydrolysis

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