Visualizing the Shear Flow-Modulated Alignments in Cellulose Nanocrystal Films by the Mueller Matrix

Feng, Xiaowei; Chen, Bo; Kong, Demei; Wang, Ting; Cui, Xiaoyan; Tian, Yang

doi:10.1021/acs.jpcc.3c00577

Cited by 3 publications

(2 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The uniaxial orientation of the LC monomers induced by shear force is due to viscoelasticity of the ink. [43][44][45] The orientational state of the LC monomers after shear coating was observed by POM (Figure 3a-d). Optical birefringence dynamically changes according to the angle (𝜃) between the shear direction (SD) and the polarizer (or analyzer).…”

Section: Shear-induced Uniaxial Orientation and Light-driven Phase Ch...mentioning

confidence: 99%

Smart Anti‐Counterfeiting Inks: Controlled Luminescence Polarization and Its Fixation by Photoisomerization and Subsequent Photopolymerization of Cyanostilbene‐Based Liquid Crystal Monomers

Koo

Kim

Hyeong

et al. 2023

Advanced Optical Materials

View full text Add to dashboard Cite

To identify and protect authentics from counterfeits, anti‐counterfeiting materials are developed. In spite of many advances in luminescent anti‐counterfeiting materials, there is still a need for easily processible, multilevel anti‐counterfeiting materials. Here, the study reports a novel strategy for the production of smart anti‐counterfeiting inks and films using a cyanostilbene‐based liquid crystal (LC) monomer (CSRM). This smart ink is prepared by mixing CSRM and conventional nematic LC monomers. The optimized ink with a nematic mesophase is uniaxially oriented by simple shear coating for high transmittance and linearly polarized light emission. Upon subsequent irradiation with 365 nm UV light using a photomask, a phase transition to an isotropic state occurs by photoisomerization of CSRM in selected areas, resulting in unpolarized photoluminescence in those areas. Two optically different regions (UV treated and untreated) can be permanently fixed by photopolymerization under 460 nm blue light. Multilevel anti‐counterfeiting labels programmed by simple shear coating, molecular self‐assembly, selective photoisomerization, and photopolymerization fixation can provide a new insight in developing smart anti‐counterfeiting inks and films.

show abstract

Section: Shear-induced Uniaxial Orientation and Light-driven Phase Ch...mentioning

confidence: 99%

Smart Anti‐Counterfeiting Inks: Controlled Luminescence Polarization and Its Fixation by Photoisomerization and Subsequent Photopolymerization of Cyanostilbene‐Based Liquid Crystal Monomers

Koo

Kim

Hyeong

et al. 2023

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…When aligning at high shear rates, CNCs gain translational entropy at the expense of rotational freedom . A recent study in 2023 indicated that the circular shear-flow-induced helical CNC reorientation is a complex process involving an early in-plane unwinding and a later helically vertical unwinding process as visualized by the complete polarization analysis and optical simulation . Shear-induced chiral nematic alignment offers excellent control over the orientation of the chiral nematic CNCs during EISA, which can be used to accelerate CNC assembly together with other approaches, such as continuous coating, filtration, and confined geometry extrusion …”

Section: Evaporation-induced Self-assembly For Solid Cnc Chiral Filmsmentioning

confidence: 99%

Accelerating Cellulose Nanocrystal Assembly into Chiral Nanostructures

et al. 2023

View full text Add to dashboard Cite

Cellulose nanocrystal (CNC) suspensions self-assembled into chiral nematic liquid crystals. This property has enabled the development of versatile optical materials with fascinating properties. Nevertheless, the scale-up production and commercial success of chiral nematic CNC superstructures face significant challenges. Fabrication of chiral nematic CNC nanostructures suffers from a ubiquitous pernicious trade-off between uniform chiral nematic structure and rapid self-assembly. Specifically, the chiral nematic assembly of CNCs is a time-consuming, spontaneous process that involves the organization of particles into ordered nanostructures as the solvent evaporates. This review is driven by the interest in accelerating chiral nematic CNC assembly and promoting a long-range oriented chiral nematic CNC superstructure. To start this review, the chirality origins of CNC and CNC aggregates are analyzed. This is followed by a summary of the recent advances in stimuli-accelerated chiral nematic CNC self-assembly procedures, including evaporation-induced self-assembly, continuous coating, vacuum-assisted self-assembly, and shear-induced CNC assembly under confinement. In particular, stimuli-induced unwinding, alignment, and relaxation of chiral nematic structures were highlighted, offering a significant link between the accelerated assembly approaches and uniform chiral nematic nanostructures. Ultimately, future opportunities and challenges for rapid chiral nematic CNC assembly are discussed for more innovative and exciting applications.

show abstract

Polysaccharide Nanocrystals-Based Chiral Nematic Structures: From Self-Assembly Mechanisms, Regulation, to Applications

Liu,

Wang,

Xin

et al. 2024

ACS Nano

View full text Add to dashboard Cite

Chiral architectures, one of the key structural features of natural systems ranging from the nanoscale to macroscale, are an infinite source of inspiration for functional materials. Researchers have been, and still are, strongly pursuing the goal of constructing such structures with renewable and sustainable building blocks via simple and efficient strategies. With the merits of high sustainability, renewability, and the ability to self-assemble into chiral nematic structures in aqueous suspensions that can be preserved in the solid state, polysaccharide nanocrystals (PNs) including cellulose nanocrystals (CNCs) and chitin nanocrystals (ChNCs) offer opportunities to reach the target. We herein provide a comprehensive review that focuses on the development of CNCs and ChNCs for the use in advanced functional materials. First, the introduction of CNCs and ChNCs, and cellulose- and chitin-formed chiral nematic organizations in the natural world, are given. Then, the self-assembly process of such PNs and the factors influencing this process are comprehensively discussed. After that, we showcased the emerging applications of the self-assembled chiral nematic structures of CNCs and ChNCs. Finally, this review concludes with perspectives on the challenges and opportunities in this field.

show abstract

Visualizing the Shear Flow-Modulated Alignments in Cellulose Nanocrystal Films by the Mueller Matrix

Cited by 3 publications

References 35 publications

Smart Anti‐Counterfeiting Inks: Controlled Luminescence Polarization and Its Fixation by Photoisomerization and Subsequent Photopolymerization of Cyanostilbene‐Based Liquid Crystal Monomers

Smart Anti‐Counterfeiting Inks: Controlled Luminescence Polarization and Its Fixation by Photoisomerization and Subsequent Photopolymerization of Cyanostilbene‐Based Liquid Crystal Monomers

Accelerating Cellulose Nanocrystal Assembly into Chiral Nanostructures

Polysaccharide Nanocrystals-Based Chiral Nematic Structures: From Self-Assembly Mechanisms, Regulation, to Applications

Contact Info

Product

Resources

About