Optimizing the performance of the near-infrared (NIR) photothermal conversion <i>via</i> modulating the domain size of the chiral nematic phase in co-assembled cellulose nanocrystal composite films

Feng, Kai; Wei, Guodan; Lu, Mengfan; Gao, Naiwei; Wang, Yapei; Jin, Zhaoxia

doi:10.1039/d2tc02403a

Cited by 6 publications

(4 citation statements)

References 48 publications

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“…CNC suspensions were prepared through the sulfuric acid-mediated hydrolysis of Whatman ashless filter paper according to our previous work. , Briefly, 5 g of filter paper was cut into small pieces and hydrolyzed in 50 mL of 64 wt % sulfuric acids at 45 °C under vigorous stirring for 45 min. Then, the resulting faint yellow slurry was added into cold deionized water (10-fold of the acid solution) to stop the hydrolysis.…”

Section: Methodsmentioning

confidence: 99%

Exploring the Core Parameters of CNC-Based Chiral Nematic Structures for Enhancing the Dissymmetry Factor of Right-Handed Circularly Polarized Luminescence

Wei

Feng

et al. 2023

ACS Omega

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The chiral nematic nanostructure formed from cellulose nanocrystal (CNC) self-assembly has shown great potential as a matrix for generating circularly polarized luminescent (CPL) light with a high dissymmetry factor. Exploring the relationship between the device composition and structure and the light dissymmetry factor is crucial to a common strategy for a strongly dissymmetric CPL light. In this study, we have compared the single-layered and double-layered CNC-based CPL devices with different luminophores, such as rhodamine 6G (R6G), methylene blue (MB), crystal violet (CV), and silicon quantum dots (Si QDs). We demonstrated that forming a double-layered structure of CNCs nanocomposites is a simple but effective pathway for enhancing the CPL dissymmetry factor for CNC-based CPL materials containing different luminophores. The |g lum | values of double-layered CNC devices (dye@CNC5||CNC5) versus that of single-layered devices (dye@CNC5) are 3.25 times for Si QDs, 3.7 times for R6G, 3.1 times for MB, and 2.78 times for CV series. The different enhancement degrees of these CNC layers with a similar thickness may be due to the different pitch numbers in the chiral nematic liquid crystal layers whose photonic band gap (PBG) has been modified to match the emission wavelengths of dyes. Furthermore, the assembled CNC nanostructure has great tolerance to the addition of nanoparticles. Gold nanorods coated with the SiO 2 layer (Au NR@SiO 2 ) were added for enhancing the dissymmetry factor of MB in CNC composites (named MAS devices). When the strong longitudinal plasmonic band of the Au NR@SiO 2 matched the emission wavelength of MB and the PBG of assembled CNC structures simultaneously, the increase in the g lum factor and quantum yield of MAS composites was obtained. The good compatibility of the assembled CNC nanostructures makes it a universal platform for developing strong CPL light sources with a high dissymmetry factor.

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Section: Methodsmentioning

confidence: 99%

Exploring the Core Parameters of CNC-Based Chiral Nematic Structures for Enhancing the Dissymmetry Factor of Right-Handed Circularly Polarized Luminescence

Wei

Feng

et al. 2023

ACS Omega

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“…In several instances, co-assembly is used as a mechanism for imbuing CNC films with additional functionality beyond plasticization or controlling the film optical properties. Conductive additives including polyaniline [115,116] and poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) [117,118] have been incorporated to produce films for electrochemical sensing whereby changes in the chiral nematic pitch are linked to changes in circuit conductivity/resistance. Fluorescent/luminescent additives have also been used for improved sensing, detection, or anti-counterfeiting applications, whereby environmental stimuli such as an acidic environment or exposure to UV light can quench film fluorescence.…”

Section: Co-assemblymentioning

confidence: 99%

Chiral nematic cellulose nanocrystal composites: An organized review

De France

2024

Can J Chem Eng

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Cellulose nanocrystals (CNCs) are commercially available materials derived from cellulose, the most abundant biopolymer on our planet. Due largely to their high strength, high surface area‐to‐volume ratio, tailorable surface chemistry, and the abundance of biomass feedstocks with which to produce them, CNCs have attracted significant interest in applications spanning the paints and coatings, composites, packaging, and biomedical sectors. However, and perhaps most interestingly, CNCs will self‐assemble (or, as I've teased in the title, organize) to form highly ordered chiral nematic liquid crystal phases when concentrated in suspension. Upon complete solvent evaporation, this chiral nematic order is ‘locked’, yielding films with structural colour—colour arising not due to chemical pigments, but rather due to the physical structure of a material itself. In the pursuit of novel multi‐functional materials, research interest has shifted recently towards the incorporation of functional additives to form composite chiral nematic films. Along with introducing the basics of liquid crystals and self‐assembly, this review discusses the main approaches used in order to form CNC‐based composite films: co‐assembly, templating, and post‐processing, and highlights exceptional examples in each case. Finally, I give my uniquely Canadian perspective on the current status, future prospects, and major challenges associated with the development of CNC‐based chiral nematic composite materials.

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“…Cellulose nanocrystals (CNCs) have been extensively studied for their ability to self-assemble into cholesteric liquid crystal phases, which exhibit birefringence, iridescence, and pitch-dependent one-dimensional photonic properties. − While much research has focused on CNC-based solid thin films obtained through nonflowing processes like evaporation-induced self-assembly, − the challenge lies in processing these structures using flowing-based techniques − such as spinning and printing to create optical devices with complex structures. ,,, Unfortunately, shear forces applied during these processes can cause particle alignment and damage the chiral liquid crystal structure of CNCs. ,, The fabrication of high-quality CNC-based liquid crystal structures requires a deep understanding of phase separation, microstructure, and rheological behavior of the suspension.…”

Section: Introductionmentioning

confidence: 99%

Modulation of Tannic Acid on the Cholesteric Structure of Cellulose Nanocrystals

Jie,

Feng,

et al. 2024

Langmuir

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Optimizing the performance of the near-infrared (NIR) photothermal conversion via modulating the domain size of the chiral nematic phase in co-assembled cellulose nanocrystal composite films

Abstract: Near-infrared (NIR) photothermal materials based on conjugated polymers have shown great potential in energy storage, therapeutics, and diagnosis. Optimizing the dispersion of conductive polymers in these composites is an effective...

Cited by 6 publications

References 48 publications

Exploring the Core Parameters of CNC-Based Chiral Nematic Structures for Enhancing the Dissymmetry Factor of Right-Handed Circularly Polarized Luminescence

Exploring the Core Parameters of CNC-Based Chiral Nematic Structures for Enhancing the Dissymmetry Factor of Right-Handed Circularly Polarized Luminescence

Chiral nematic cellulose nanocrystal composites: An organized review

Modulation of Tannic Acid on the Cholesteric Structure of Cellulose Nanocrystals

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