Tuning the Iridescence of Chiral Nematic Cellulose Nanocrystal Films with a Vacuum-Assisted Self-Assembly Technique

2014 ◽  
Vol 15 (11) ◽  
pp. 4343-4350 ◽  
Author(s):  
Qi Chen ◽  
Ping Liu ◽  
Fuchun Nan ◽  
Lijuan Zhou ◽  
Jianming Zhang
Keyword(s):  
Self Assembly ◽  
Cellulose Nanocrystal ◽  
Chiral Nematic ◽  
Assembly Technique ◽  
Nanocrystal Films

scholarly journals Chiral Nematic Cellulose Nanocrystal Films Cooperated with Amino Acids for Tunable Optical Properties

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4389
Author(s):  
Xiao Xiao ◽  
Jie Chen ◽  
Zhe Ling ◽  
Jiaqi Guo ◽  
Jianbin Huang ◽  
...  
Keyword(s):  
Amino Acids ◽  
Self Assembly ◽  
Uv Light ◽  
Composite Films ◽  
Functional Materials ◽  
Cellulose Nanocrystal ◽  
Optical Functions ◽  
Chiral Nematic ◽  
Evaporation Induced Self Assembly ◽  
Nanocrystal Films

The exploration of functional materials relies greatly on the understanding of material structures and nanotechnologies. In the present work, chiral nematic cellulose nanocrystal (CNC) films were prepared by incorporation with four types of amino acids (AAs, glycine, histidine, phenylalanine, and serine) via evaporation-induced self-assembly. The films present ideal iridescence and birefringence that can be tuned by the amount of AAs added. The intercalation of AAs enlarged the pitch values, contributing to the red-shift trend of the reflective wavelength. Among the AAs, serine presented the most compatible intercalation into cellulose crystals. Interestingly, histidine and phenylalanine composite films showed high shielding capabilities of UV light in diverse wavelength regions, exhibiting multi-optical functions. The sustainable preparation of chiral nematic CNC films may provide new strategies for materials production from biocompatible lignocellulose.

scholarly journals Circularly Polarized Light Detection by Chiral Photonic Cellulose Nanocrystal with ZnO Photoconductive Layer in Ultraviolet Region

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3098
Author(s):  
Boyu Zhang ◽  
Sixiang Zhao ◽  
Yingying Yu ◽  
Ming Li ◽  
Liancheng Zhao ◽  
...  
Keyword(s):  
Self Assembly ◽  
Polarization State ◽  
Polarized Light ◽  
Cellulose Nanocrystal ◽  
Ultraviolet Region ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Left Handed ◽  
Chiral Nematic ◽  
Wide Range

Circularly polarized light (CPL) detection and polarization state recognition are required for a wide range of applications. Conventional polarization detection with optical components causes difficulties for miniaturization and integration. An effective design strategy is proposed for direct CPL detection with chiral material. Here, we realized direct CPL detection based on the combination of chiral photonic cellulose nanocrystal (CNC) and ultraviolet-sensitive ZnO photoconductive material. The CNC layer deposited by evaporation-induced self-assembly established the left-handed chiral nematic structure with a photonic bandgap (PBG) to recognize left-handed CPL (LCPL) and right-handed CPL (RCPL) at specific wavelengths. The PBG of CNC layer has been modulated by the adjustment of chiral nematic pitch to match the semiconductor bandgap of ZnO film in ultraviolet region. The photocurrents under RCPL and LCPL are 2.23 × 10−6 A and 1.77 × 10−6 A respectively and the anisotropy factor Δgpc of 0.23 is acquired for the CPL detection based on the chiral photonic CNC. This design provides a new approach to the detection of CPL polarization state with competitive performance.

Preparation of a novel magnetic cellulose nanocrystal and its efficient use for enzyme immobilization

2014 ◽  
Vol 2 (34) ◽  
pp. 5522-5530 ◽  
Author(s):  
Shi-Lin Cao ◽  
Xue-Hui Li ◽  
Wen-Yong Lou ◽  
Min-Hua Zong
Keyword(s):  
Enzyme Immobilization ◽  
Self Assembly ◽  
Cellulose Nanocrystal ◽  
Assembly Technique ◽  
Co Precipitation

Preparation of a novel magnetic cellulose nanocrystal via a simple co-precipitation-electrostatic-self-assembly technique and its efficient use for enzyme immobilization.

scholarly journals Biomimetic Templating: Tessellation of Chiral‐Nematic Cellulose Nanocrystal Films by Microtemplating (Adv. Funct. Mater. 25/2019)

2019 ◽  
Vol 29 (25) ◽  
pp. 1970169
Author(s):  
Blaise L. Tardy ◽  
Bruno D. Mattos ◽  
Luiz G. Greca ◽  
Tero Kämäräinen ◽  
Konrad W. Klockars ◽  
...  
Keyword(s):  
Cellulose Nanocrystal ◽  
Chiral Nematic ◽  
Nanocrystal Films

scholarly journals Tessellation of Chiral‐Nematic Cellulose Nanocrystal Films by Microtemplating

2019 ◽  
Vol 29 (25) ◽  
pp. 1808518 ◽  
Author(s):  
Blaise L. Tardy ◽  
Bruno D. Mattos ◽  
Luiz G. Greca ◽  
Tero Kämäräinen ◽  
Konrad W. Klockars ◽  
...  
Keyword(s):  
Cellulose Nanocrystal ◽  
Chiral Nematic ◽  
Nanocrystal Films

scholarly journals Cellulose Based Photonic Materials Displaying Direction Modulated Photoluminescence

2021 ◽  
Vol 9 ◽  
Author(s):  
Molíria V. Santos ◽  
Fernando E. Maturi ◽  
Édison Pecoraro ◽  
Hernane S. Barud ◽  
Laís R. Lima ◽  
...  
Keyword(s):  
Optical Properties ◽  
Self Assembly ◽  
Light Emission ◽  
Composite Films ◽  
Film Structure ◽  
Cellulose Nanocrystal ◽  
Attractive Alternative ◽  
Photonic Materials ◽  
Light Emitting ◽  
Chiral Nematic

Photonic materials featuring simultaneous iridescence and light emission are an attractive alternative for designing novel optical devices. The luminescence study of a new optical material that integrates light emission and iridescence through liquid crystal self-assembly of cellulose nanocrystal-template silica approach is herein presented. These materials containing Rhodamine 6G were obtained as freestanding composite films with a chiral nematic organization. The scanning electron microscopy confirms that the cellulose nanocrystal film structure comprises multi-domain Bragg reflectors and the optical properties of these films can be tuned through changes in the relative content of silica/cellulose nanocrystals. Moreover, the incorporation of the light-emitting compound allows a complementary control of the optical properties. Overall, such findings demonstrated that the photonic structure plays the role of direction-dependent inner-filter, causing selective suppression of the light emitted with angle-dependent detection.

scholarly journals Effect of A Limited Amount of D-Sorbitol on Pitch and Mechanical Properties of Cellulose Nanocrystal Films

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1324
Author(s):  
Xiao-Yao Wei ◽  
Tao Lin ◽  
Le Wang ◽  
Xue-Feng Yin
Keyword(s):  
Mechanical Properties ◽  
Self Assembly ◽  
Aqueous Suspension ◽  
Young Modulus ◽  
Cellulose Nanocrystal ◽  
Chiral Structure ◽  
Liquid Crystal Films ◽  
Significant Difference ◽  
Crystal Films ◽  
Nanocrystal Films

A cellulose nanocrystal (CNC) suspension can form liquid crystal films with unique self-assembly behaviors. This gives CNC films a special iridescence, which has potential in many aspects, but the brittleness of pure CNC films limits their application. In this work, we propose a simple physical mixing method to obtain CNC film by adding D-sorbitol as a plasticizer. We first found that low D-sorbitol content (less than 6 wt% in CNC/DS composite solution) did not make a significant difference compared with pure CNC films in optical performance and, at the same time, the mechanical properties of the CNC films were improved. The various low contents of D-sorbitol can be well dispersed in CNC aqueous suspension, and the wavelength of the selectively reflected phenomenon is relatively stable and slightly decreased at 5 nm for concentrations from 0 to 6%. This phenomenon is opposite to that generally reported, where the wavelength of the selective reflected phenomenon increases obviously with the increase in plastic content. The pitch of the chiral structure decreased from 406 to 362 nm with an increase in D-sorbitol concentration. When the content of D-sorbitol reached 4%, the tensile strength, elongation at break, and Young modulus increased to 39.9 Mpa, 3.00%, and 2.99 GPa, respectively.

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