scholarly journals Hyperspectral Imaging of Photonic Cellulose Nanocrystal Films: Structure of Local Defects and Implications for Self-Assembly Pathways

ACS Nano ◽  
2020 ◽  
Vol 14 (11) ◽  
pp. 15361-15373
Author(s):  
Bonan Zhu ◽  
Villads E. Johansen ◽  
Gen Kamita ◽  
Giulia Guidetti ◽  
Mélanie M. Bay ◽  
...  
Keyword(s):  
Hyperspectral Imaging ◽  
Self Assembly ◽  
Cellulose Nanocrystal ◽  
Nanocrystal Films ◽  
Local Defects ◽  
Assembly Pathways

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.

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 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.

Biomimetic Optical Cellulose Nanocrystal Films with Controllable Iridescent Color and Environmental Stimuli-Responsive Chromism

2018 ◽  
Vol 10 (6) ◽  
pp. 5805-5811 ◽  
Author(s):  
Yao-Dong He ◽  
Ze-Lian Zhang ◽  
Juan Xue ◽  
Xiao-Hui Wang ◽  
Fei Song ◽  
...  
Keyword(s):  
Cellulose Nanocrystal ◽  
Stimuli Responsive ◽  
Environmental Stimuli ◽  
Nanocrystal Films

scholarly journals Cellulose nanocrystal-based materials: from liquid crystal self-assembly and glass formation to multifunctional thin films

2014 ◽  
Vol 6 (1) ◽  
pp. e80-e80 ◽  
Author(s):  
Jan P F Lagerwall ◽  
Christina Schütz ◽  
Michaela Salajkova ◽  
JungHyun Noh ◽  
Ji Hyun Park ◽  
...  
Keyword(s):  
Thin Films ◽  
Liquid Crystal ◽  
Self Assembly ◽  
Glass Formation ◽  
Cellulose Nanocrystal

Solid-state 23Na NMR spectroscopy studies of ordered and disordered cellulose nanocrystal films

2019 ◽  
Vol 97 ◽  
pp. 31-39 ◽  
Author(s):  
Ryutaro Ohashi ◽  
Carl A. Michal ◽  
Wadood Y. Hamad ◽  
Thanh-Dinh Nguyen ◽  
Motohiro Mizuno ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Cellulose Nanocrystal ◽  
Nanocrystal Films ◽  
Spectroscopy Studies ◽  
23Na Nmr

Microelectromechanical Systems from Aligned Cellulose Nanocrystal Films

2018 ◽  
Vol 10 (28) ◽  
pp. 24116-24123 ◽  
Author(s):  
Partha Saha ◽  
Naveed Ansari ◽  
Christopher L. Kitchens ◽  
W. Robert Ashurst ◽  
Virginia A. Davis
Keyword(s):  
Microelectromechanical Systems ◽  
Cellulose Nanocrystal ◽  
Nanocrystal Films

Hierarchical Self-Assembly Pathways of Peptoid Helices and Sheets

2022 ◽  
Author(s):  
Mingfei Zhao ◽  
Kacper J. Lachowski ◽  
Shuai Zhang ◽  
Sarah Alamdari ◽  
Janani Sampath ◽  
...  
Keyword(s):  
Self Assembly ◽  
Assembly Pathways
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