Uniformly Assembly of Filamentous Phage/SiO 2 Composite Films with Tunable Chiral Nematic Structure in Capillary Confinement

2021 ◽  
Author(s):  
Fuqiang Wan ◽  
Kun Wang ◽  
Chenglong Zhu ◽  
Hang Ping ◽  
Hao Xie ◽  
...  
Keyword(s):  
Composite Films ◽  
Filamentous Phage ◽  
Chiral Nematic ◽  
Chiral Nematic Structure

scholarly journals Flexible and Structural Coloured Composite Films from Cellulose Nanocrystals/Hydroxypropyl Cellulose Lyotropic Suspensions

Crystals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 122 ◽  
Author(s):  
Diogo V. Saraiva ◽  
Ricardo Chagas ◽  
Beatriz M. de Abreu ◽  
Cláudia N. Gouveia ◽  
Pedro E. S. Silva ◽  
...  
Keyword(s):  
Cellulose Nanocrystals ◽  
Near Infrared ◽  
Colloidal Suspension ◽  
Aqueous Suspension ◽  
Composite Films ◽  
Helical Structure ◽  
Infrared Region ◽  
Hydroxypropyl Cellulose ◽  
Chiral Nematic ◽  
Chiral Nematic Structure

Lyotropic colloidal aqueous suspensions of cellulose nanocrystals (CNCs) can, after solvent evaporation, retain their chiral nematic arrangement. As water is removed the pitch value of the suspension decreases and structural colour-generating films, which are mechanically brittle in nature, can be obtained. Increasing their flexibility while keeping the chiral nematic structure and biocompatible nature is a challenging task. However, if achievable, this will promote their use in new and interesting applications. In this study, we report on the addition of different amounts of hydroxypropyl cellulose (HPC) to CNCs suspension within the coexistence of the isotropic-anisotropic phases and infer the influence of this cellulosic derivative on the properties of the obtained solid films. It was possible to add 50 wt.% of HPC to a CNCs aqueous suspension (to obtain a 50/50 solids ratio) without disrupting the LC phase of CNCs and maintaining a left-handed helical structure in the obtained films. When 30 wt.% of HPC was added to the suspension of CNCs, a strong colouration in the film was still observed. This colour shifts to the near-infrared region as the HPC content in the colloidal suspension increases to 40 wt.% or 50 wt.% The all-cellulosic composite films present an increase in the maximum strain as the concentration of HPC increases, as shown by the bending experiments and an improvement in their thermal properties.

scholarly journals Concentric chiral nematic polymeric fibers from cellulose nanocrystals

2021 ◽  
Author(s):  
Arash Momeni ◽  
Christopher M. Walters ◽  
Yi-Tao Xu ◽  
Wadood Y. Hamad ◽  
Mark J. MacLachlan
Keyword(s):  
Cellulose Nanocrystals ◽  
Liquid Crystalline ◽  
Capillary Tube ◽  
Single Domain ◽  
Cellulose Nanocrystal ◽  
Polymeric Fibers ◽  
Chiral Nematic ◽  
Chiral Nematic Structure ◽  
Crystalline Suspension

A cellulose nanocrystal liquid crystalline suspension was mixed with monomers and confined to a capillary tube. After photopolymerization, a fiber with a single-domain concentric chiral nematic structure throughout the length of the fiber was obtained.

Photonic actuators with predefined shapes

Nanoscale ◽  
2019 ◽  
Vol 11 (20) ◽  
pp. 10088-10096 ◽  
Author(s):  
Na Yang ◽  
Xingxiang Ji ◽  
Juanjuan Sun ◽  
Yu Zhang ◽  
Qinghua Xu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Shape Recovery ◽  
Phenol Formaldehyde ◽  
Composite Films ◽  
Phenol Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Selective Treatment ◽  
Good Shape ◽  
Chiral Nematic

Highly flexible and chiral nematic phenol formaldehyde resin (PFR)/graphene oxide (GO) composite films are prepared by CNC-templating, which can be forged into objects with predefined shapes and show good shape recovery capability by selective treatment with aldehydes.

scholarly journals Enhanced Photogenerated Charge Carriers and Photocatalytic Activity of Biotemplated Mesoporous TiO2 Films with a Chiral Nematic Structure

2019 ◽  
Vol 31 (13) ◽  
pp. 4851-4863 ◽  
Author(s):  
Getaneh Diress Gesesse ◽  
Chunyu Li ◽  
Erwan Paineau ◽  
Youssef Habibi ◽  
Hynd Remita ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Mesoporous Tio2 ◽  
Charge Carriers ◽  
Tio2 Films ◽  
Chiral Nematic ◽  
Chiral Nematic Structure ◽  
Mesoporous Tio2 Films

Flexible and Responsive Chiral Nematic Cellulose Nanocrystal/Poly(ethylene glycol) Composite Films with Uniform and Tunable Structural Color

2017 ◽  
Vol 29 (28) ◽  
pp. 1701323 ◽  
Author(s):  
Kun Yao ◽  
Qijun Meng ◽  
Vincent Bulone ◽  
Qi Zhou
Keyword(s):  
Ethylene Glycol ◽  
Composite Films ◽  
Cellulose Nanocrystal ◽  
Structural Color ◽  
Poly Ethylene Glycol ◽  
Chiral Nematic ◽  
Poly Ethylene

Chiroptical, morphological and conducting properties of chiral nematic mesoporous cellulose/polypyrrole composite films

2017 ◽  
Vol 5 (36) ◽  
pp. 19184-19194 ◽  
Author(s):  
Erlantz Lizundia ◽  
Thanh-Dinh Nguyen ◽  
Jose L. Vilas ◽  
Wadood Y. Hamad ◽  
Mark J. MacLachlan
Keyword(s):  
Composite Materials ◽  
Composite Films ◽  
Cellulose Nanocrystal ◽  
Chemical Polymerization ◽  
Chiral Nematic ◽  
Polypyrrole Composite ◽  
Surface Modified ◽  
Cellulose Composite

Conductive chiral nematic cellulose composite materials have been fabricated via in situ oxidative chemical polymerization of pyrrole onto surface-modified mesoporous cellulose nanocrystal (CNC) films.

scholarly journals Sol-Gel Biotemplating Route with Cellulose Nanocrystals to Design Photocatalyst Boosting the Hydrogen Generation

2020 ◽  
Author(s):  
cong wand ◽  
jian li ◽  
Erwan Paineau ◽  
Abdelghani Laachachi ◽  
Christophe Colbeau-Justin ◽  
...  
Keyword(s):  
Cellulose Nanocrystals ◽  
Hydrogen Generation ◽  
Light Harvesting ◽  
Sol Gel ◽  
Charge Carriers ◽  
Hybrid Films ◽  
One Pot ◽  
Chiral Nematic ◽  
Straightforward Method ◽  
Chiral Nematic Structure

<br> <div> <p>Light harvesting capability and charge carriers lifetime play critical roles in determining the photoefficency of photocatalyst. Herein, a one-pot method is proposed to design mesostructured TiO<sub>2</sub> materials by taking advantage of the ability of cellulose nanocrystals (CNC) to self-assemble into chiral nematic structures during solvent evaporation. After the xerogel formation, the as-obtained CNC/TiO<sub>2</sub> hybrid films exhibit a chiral nematic structure and tunable Bragg peak reflection, generating lamellar TiO<sub>2</sub> mesostructure after the biotemplate removal by calcination. More prominently, this straightforward method can be extended to couple TiO<sub>2</sub> with other metal oxides, improving the light-harvesting and charge carriers separation of these photocatalysts, in particular for boosting hydrogen generation. This foolproof approach opens new doors for the development of nanostructured materials for solar energy conversion and catalysis.<br></p></div>

Structurally coloured organic–inorganic hybrid silica films with a chiral nematic structure prepared through a self-templating approach

2020 ◽  
pp. 1-5
Author(s):  
Weiwei Liu ◽  
Haohao Wei ◽  
Hongkun Li ◽  
Yong Wang ◽  
Limin Wu ◽  
...  
Keyword(s):  
Silica Films ◽  
Inorganic Hybrid ◽  
Hybrid Silica ◽  
Chiral Nematic ◽  
Chiral Nematic Structure

Chiral nematic latex–GO composite films with synchronous response of color and actuation

2019 ◽  
Vol 7 (1) ◽  
pp. 104-110 ◽  
Author(s):  
Juanjuan Sun ◽  
Xingxiang Ji ◽  
Guihua Li ◽  
Yu Zhang ◽  
Na Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Morphological Changes ◽  
Composite Films ◽  
Oxide Composite ◽  
Chiral Nematic

A two-step strategy has been developed for preparing asymmetrically-organized, flexible latex/graphene oxide composite films that have chiral nematic structures. The films show dual responses with interesting color and morphological changes toward water.

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.

Sign in / Sign up

Export Citation Format

Share Document