Identification and sorting of particle chirality using liquid crystallinity

Date

2020-08-15

Author

AKDENİZ, BURAK
Batır, Özge
Büküşoğlu, Emre

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

146
views

0
downloads

Particles dispersed in liquid crystals (LCs) have been shown to assemble due to the elastic interactions arising from the molecular anisotropy. Studies have shown that the alignment of the particles within LCs were strongly dependent on the surface director of LCs on particles. Different from the past studies involving particles with degenerate planar anchoring of LCs, this study shows that the azimuthal surface director can be used to control and finely tune the positioning of the particles in LCs. Specifically, polymeric particles with two flat surfaces that mediate parallel or non-parallel (chiral) anchoring were synthesized and dispersed in nematic 5CB with spatial variations in the director profile. Besides demonstration of their positioning, it was observed that the particles with same chiral handedness with the LC twist were distributed within the LC film, whereas particles with opposite handedness were repelled from the LC medium due to the elastic energy contributions. In addition, a pronounced effect of the surface anchoring of the particles were present on their orientation during non-equilibrium events such as sedimentation. Overall, the studies presented here will find potential use in sensors, separations, optics or soft robotic applications that will take advantages of chirality or chiral interactions.

Subject Keywords

Colloid and Surface Chemistry, Electronic, Optical and Magnetic Materials, Surfaces, Coatings and Films, Biomaterials

URI

https://hdl.handle.net/11511/36197

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE

DOI

https://doi.org/10.1016/j.jcis.2020.04.002

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

Understanding the Dielectric Properties of Heat-Treated Carbon Nanofibers at Terahertz Frequencies: a New Perspective on the Catalytic Activity of Structured Carbonaceous Materials Parrott, Edward P. J.; Zeitler, J. Axel; McGregor, James; Oei, Shu-Pei; Ünalan, Hüsnü Emrah; Tan, Swee-Ching; Milne, William I.; Tessonnier, Jean-Philippe; Schloegl, Robert; Gladden, Lynn F. (American Chemical Society (ACS), 2009-06-18) Terahertz time domain spectroscopy (THz-TDS) has been used to study the electrical and optical properties of a series of carbon nanofibers (CNFs) that have undergone different heat treatments. The high-temperature heat-treated (HHT) sample displayed increased absorption and real refractive indices across the range 0.3-3.5 THz when compared to the low-temperature heat-treated (LHT) and pyrolitically stripped (PS) samples. The experimental results were fitted by using a Drude-Lorentz model and an effective me...
Preparation and Comparison of Two Electrodes for Supercapacitors: Pani/CNT/Ni and Pani/Alizarin-Treated Nickel Koysuren, Ozcan; Du, Chunsheng; Pan, Ning; Bayram, Göknur (Wiley, 2009-07-15) Polyaniline in emeraldine form was synthesized in the presence of multiwalled carbon nanotubes (CNTs), and the electrochemical capacitance performance of thus formed composite as electrode material has been Studied. The polyaniline/carbon nanotubes (Pani/CNT) composite is found to result in a higher specific capacitance than that of either composite constituent, attributable to the double-layer capacitance behavior of the nanotubes in the Pani/CNT system. However, once assembled into a two-electrode cell, l...
A Comparative Density Functional Study of Hydrogen Peroxide Adsorption and Activation on the Graphene Surface Doped with N, B, S, Pd, Pt, Au, Ag, and Cu Atoms Duzenli, Derya (American Chemical Society (ACS), 2016-09-15) The adsorption of the hydrogen peroxide (H2O2) molecule, which is known as the common form of reactive oxygen species in living cells, was investigated theoretically over pure graphene and heteroatom- (nitrogen-, boron-, and sulfur-) and metal-atom- (silver-, gold-, copper-, palladium-, and platinum-) doped graphene surfaces using the density functional theory (DFT) method. This study involved the optimization of pure and doped graphene surfaces, adsorption of the gas molecule on top of the doped atoms and ...
Effects of boron doping on solid phase crystallization of in situ doped amorphous Silicon thin films prepared by electron beam evaporation Sedani, Salar H.; Yasar, Ozlen F.; Karaman, Mehmet; Turan, Raşit (Elsevier BV, 2020-01-31) In this work, we studied solid-phase crystallization of boron-doped non-hydrogenated amorphous Si films fabricated by electron beam evaporation equipped with effusion cells (e-Beam EC) on silicon nitride coated glass substrates. We investigated the effect of boron doping on the crystallization kinetics through a series of experiments with different boron doping concentrations controlled by the effusion cell temperature. We employed Raman spectroscopy, time-of-flight secondary ion mass spectroscopy, grazing ...
Structural and optical properties of thermally annealed thallium indium disulfide thin films Guler, I; Hasanlı, Nızamı (Elsevier BV, 2020-06-30) Structural and optical properties of thallium indium disulfide (TlInS2) thin films, deposited by thermal evaporation technique and thermally annealed at different temperatures, were analyzed. Crystallite size, dislocation density and lattice strain of the thin films were found from X-ray diffraction experiments. The atomic compositions of the films were determined from energy dispersive spectroscopy analysis. Surface morphology of the films was analyzed using atomic force microscopy. From room temperature t...

Citation Formats

B. AKDENİZ, Ö. Batır, and E. Büküşoğlu, “Identification and sorting of particle chirality using liquid crystallinity,” JOURNAL OF COLLOID AND INTERFACE SCIENCE, pp. 11–19, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36197.