scholarly journals Quantification of Optical Chirality in Cellulose Nanocrystal Films Prepared by Shear-Coating

2021 ◽  
Vol 11 (13) ◽  
pp. 6191
Author(s):  
Olga Rubí Juárez-Rivera ◽  
Reina Araceli Mauricio-Sánchez ◽  
Kenneth Järrendahl ◽  
Hans Arwin ◽  
Arturo Mendoza-Galván
Keyword(s):  
Self Assembly ◽  
Polarized Light ◽  
Mueller Matrix ◽  
Cellulose Nanocrystal ◽  
Free Standing ◽  
Full Characterization ◽  
Glass Substrates ◽  
Left Handed ◽  
Optical Chirality ◽  
Transmission Modes

Evaporation-induced-self-assembly is widely used to produce chiral cellulose nanocrystal (CNC) free-standing films reflecting left-handed polarized light. Research on supported chiral CNC films is rather scarce. The reflection and/or transmission of unpolarized light are the most common optical techniques used to characterize the selective reflection of CNC films whereas the use of techniques to quantify chiral properties is limited. Here, the fabrication of chiral CNC films supported on glass substrates by a shear-coating method, as well as a full characterization of their polarization properties, are reported. Optical chirality is evidenced in films, showing a brilliant blue structural color when viewed through a left-handed polarizer and darkness through a right-handed polarizer. Mueller-matrix data in the reflection and transmission modes are used to quantitatively characterize the structural origin of color in the films. The quantification of the linear and circular birefringence, as well as circular dichroism, is performed by analytical inversion of the Mueller matrix data in the transmission mode and regression analysis using Tellegen constitutive equations. The equivalence of the two methods to quantify the structural chirality in CNC films is demonstrated. The swelling of films in water and kinetics during drying is studied by reflection spectroscopy.

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.

scholarly journals Linear Birefringent Films of Cellulose Nanocrystals Produced by Dip-Coating

Nanomaterials ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 45 ◽  
Author(s):  
Arturo Mendoza-Galván ◽  
Tania Tejeda-Galán ◽  
Amos Domínguez-Gómez ◽  
Reina Mauricio-Sánchez ◽  
Kenneth Järrendahl ◽  
...  
Keyword(s):  
Cellulose Nanocrystals ◽  
Polarized Light ◽  
Normal Incidence ◽  
Dip Coating ◽  
Mueller Matrix ◽  
Linear Birefringence ◽  
Transparent Films ◽  
Sample Rotation ◽  
Glass Substrates ◽  
Linearly Polarized

Transparent films of cellulose nanocrystals (CNC) are prepared by dip-coating on glass substrates from aqueous suspensions of hydrolyzed filter paper. Dragging forces acting during films’ deposition promote a preferential alignment of the rod-shaped CNC. Films that are 2.8 and 6.0 µm in thickness show retardance effects, as evidenced by placing them between a linearly polarized light source and a linear polarizer sheet in the extinction configuration. Transmission Mueller matrix spectroscopic ellipsometry measurements at normal incidence as a function of sample rotation were used to characterize polarization properties. A differential decomposition of the Mueller matrix reveals linear birefringence as the unique polarization parameter. These results show a promising way for obtaining CNC birefringent films by a simple and controllable method.

scholarly journals Pitch profile across the cuticle of the scarab beetle Cotinis mutabilis determined by analysis of Mueller matrix measurements

2018 ◽  
Vol 5 (12) ◽  
pp. 181096 ◽  
Author(s):  
Arturo Mendoza-Galván ◽  
Eloy Muñoz-Pineda ◽  
Kenneth Järrendahl ◽  
Hans Arwin
Keyword(s):  
Structural Parameters ◽  
Polarized Light ◽  
Mueller Matrix ◽  
Scarab Beetle ◽  
Nonlinear Regression Analysis ◽  
Dominant Effect ◽  
Left Handed ◽  
Reflected Light ◽  
Cuticle Thickness ◽  
Level Profile

Helicoidal structures of lamellae of nanofibrils constitute the cuticle of some scarab beetles with iridescent metallic-like shine reflecting left-handed polarized light. The spectral and polarization properties of the reflected light depend on the pitch of the helicoidal structures, dispersion of effective refractive indices and thicknesses of layers in the cuticle. By modelling the outer exocuticle of the scarab beetle Cotinis mutabilis as a stack of continuously twisted biaxial slices of transparent materials, we extract optical and structural parameters by nonlinear regression analysis of variable-angle Mueller-matrix spectroscopic data. Inhomogeneities in the beetle cuticle produce depolarization with non-uniformity in cuticle thickness as the dominant effect. The pitch across the cuticle of C . mutabilis decreased with depth in a two-level profile from 380 to 335 nm and from 390 to 361 nm in greenish and reddish specimens, respectively, whereas in a yellowish specimen, the pitch decreased with depth in a three-level profile from 388 to 326 nm.

scholarly journals Circularly polarized light modulated supramolecular self-assembly for an azobenzene-based chiral gel

RSC Advances ◽  
2019 ◽  
Vol 9 (18) ◽  
pp. 10360-10363 ◽  
Author(s):  
Kenan Shao ◽  
Ziyu Lv ◽  
Yuting Xiong ◽  
Guodong Li ◽  
Dongdong Wang ◽  
...  
Keyword(s):  
Traditional Knowledge ◽  
Self Assembly ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Left Handed

An unconventional supramolecular self-assembly triggered by left-handed circularly polarized light breaks the traditional knowledge of azobenzene photoisomerization.

scholarly journals Optical Chirality Determined from Mueller Matrices

2021 ◽  
Vol 11 (15) ◽  
pp. 6742
Author(s):  
Hans Arwin ◽  
Stefan Schoeche ◽  
James Hilfiker ◽  
Mattias Hartveit ◽  
Kenneth Järrendahl ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Constitutive Relations ◽  
Mueller Matrix ◽  
Optical Path ◽  
Electromagnetic Modeling ◽  
Structural Effects ◽  
Polarization Effects ◽  
Optical Chirality ◽  
Mueller Matrices ◽  
Circular Dichroïsm

Optical chirality, in terms of circular birefringence and circular dichroism, is described by its electromagnetic and magnetoelectric material tensors, and the corresponding optical activity contributes to the Mueller matrix. Here, spectroscopic ellipsometry in the spectral range 210–1690 nm is used to address chiral phenomena by measuring Mueller matrices in transmission. Three approaches to determine chirality parameters are discussed. In the first approach, applicable in the absence of linear polarization effects, circular birefringence and circular dichroism are evaluated directly from elements of a Mueller matrix. In the second method, differential decomposition is employed, which allows for the unique separation of chirality parameters from linear anisotropic parameters as well as from depolarization provided that the sample is homogeneous along the optical path. Finally, electromagnetic modeling using the Tellegen constitutive relations is presented. The last method also allows structural effects to be included. The three methods to quantify optical chirality are demonstrated for selected materials, including sugar solutions, α-quartz, liquid crystals, beetle cuticle, and films of cellulose nanocrystals.

Free-Standing Gold-Nanoparticle Monolayer Film Fabricated by Protein Self-Assembly of α-Synuclein

2015 ◽  
Vol 127 (15) ◽  
pp. 4654-4659 ◽  
Author(s):  
Junghee Lee ◽  
Ghibom Bhak ◽  
Ji-Hye Lee ◽  
Woohyun Park ◽  
Minwoo Lee ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Self Assembly ◽  
Monolayer Film ◽  
Free Standing

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

Two-dimensional gold trisoctahedron nanoparticle superlattice sheets: self-assembly, characterization and immunosensing applications

Nanoscale ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 5065-5071 ◽  
Author(s):  
Dashen Dong ◽  
Lim Wei Yap ◽  
Detlef M. Smilgies ◽  
Kae Jye Si ◽  
Qianqian Shi ◽  
...  
Keyword(s):  
Self Assembly ◽  
Two Dimensional ◽  
Free Standing

Free-standing gold trisoctahedron superlattice nanosheet is successfully fabricated, characterized, which can serve as a novel immunosensor.

scholarly journals SANS study of mixed cholesteric cellulose nanocrystal – gold nanorod suspensions

2020 ◽  
Vol 56 (85) ◽  
pp. 13001-13004
Author(s):  
Jonas Van Rie ◽  
Guillermo González-Rubio ◽  
Sugam Kumar ◽  
Christina Schütz ◽  
Joachim Kohlbrecher ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Gold Nanorods ◽  
Small Angle ◽  
Cellulose Nanocrystals ◽  
Self Assembly ◽  
Small Angle Neutron Scattering ◽  
Gold Nanorod ◽  
Cellulose Nanocrystal

Self-assembly of cellulose nanocrystals (CNCs) doped with anisotropic gold nanorods (AuNRs) was studied by small-angle neutron scattering.

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