Structural Transitions in Cholesteric Liquid Crystal Droplets

Date

2016-07-01

Author

Zhou, Ye
Büküşoğlu, Emre
Martinez-Gonzalez, Jose A.
Rahimi, Mohammad
Roberts, Tyler F
Zhang, Rui
Wang, Xiaoguang
Abbott, Nicholas L
de Pablo, Juan Jose

Metadata

Show full item record

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

Item Usage Stats

159
views

0
downloads

Confinement of cholesteric liquid crystals (ChLC) into droplets leads to a delicate interplay between elasticity, chirality, and surface energy. In this work, we rely on a combination of theory and experiments to understand the rich morphological behavior that arises from that balance. More specifically, a systematic study of micrometer-sized ChLC droplets is presented as a function of chirality and surface energy (or anchoring). With increasing chirality, a continuous transition is observed from a twisted bipolar structure to a radial spherical structure, all within a narrow range of chirality. During such a transition, a bent structure is predicted by simulations and confirmed by experimental observations. Simulations are also able to capture the dynamics of the quenching process observed in experiments. Consistent with published work, it is found that nanoparticles are attracted to defect regions on the surface of the droplets. For weak anchoring conditions at the nanoparticle surface, ChLC droplets adopt a morphology similar to that of the equilibrium helical phase observed for ChLCs in the bulk. As the anchoring strength increases, a planar bipolar structure arises, followed by a morphological transition to a bent structure. The influence of chirality and surface interactions are discussed in the context of the potential use of ChLC droplets as stimuli-responsive materials for reporting molecular adsorbates.

Subject Keywords

General Engineering, General Physics and Astronomy, General Materials Science

URI

https://hdl.handle.net/11511/37923

Journal

ACS NANO

DOI

https://doi.org/10.1021/acsnano.6b01088

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

Properties of Tl4Se3S single crystals and characterization of Ag/Tl4Se3S Schottky barrier diodes QASRAWI, ATEF FAYEZ HASAN; Hasanlı, Nızamı (Elsevier BV, 2010-03-01) The main physical properties of Tl4Se3S single crystals were investigated for the first time. Particularly, the crystal data, Debye temperature, dark electrical resistivity and Hall effect in addition to the temperature dependent current-voltage characteristics and photosensitivity of the Ag/Tl4Se3S Schottky barrier diode were studied. The X-ray diffraction patterns have revealed that the crystal exhibited a single phase of tetragonal structure belonging to the D-4h(18) - 14mcm space group. A Debye temperat...
Structural Properties of ZnO Nanoparticels and Nanorings: Molecular Dynamics Simulations Kilic, Mehmet Emin; Erkoç, Şakir (American Scientific Publishers, 2013-06-01) Structural properties of zinc oxide (ZnO) nanoparticles and nanorings have been investigated by performing both equilibrium and nonequilibrium classical molecular dynamics simulations at various temperatures. An atomistic potential energy function has been used to represent the interactions among the atoms. It has been found that ZnO nanostructures undergo a structural change depending on temperature and different models. ZnO nanorings change into rod like structures with the effect of temperature. On the o...
Excess Thermopower and the Theory of Thermopower Waves Abrahamson, Joel T.; Sempere, Bernat; Walsh, Michael P.; Forman, Jared M.; Sen, Fatih; Sen, Selda; Mahajan, Sayalee G.; Paulus, Geraldine L. C.; Wang, Qing Hua; Choi, Wonjoon; Strano, Michael S. (American Chemical Society (ACS), 2013-08-01) Self propagating exothermic chemical reactions can generate electrical pulses when guided along a conductive conduit such as a carbon nanotube. However, these thermopower waves are not described bran existing theory to explain the origin of power generation or why its magnitude exceeds the predictions of the Seebeck effect In this work, we present a quantitative theory that describes the electrical dynamics of thermopower waves, showing that they produce an excess thermopower additive to the Seebeck predict...
Crystal data, photoconductivity and carrier scattering mechanisms in CuIn5S8 single crystals Qasrawi, AF; Hasanlı, Nızamı (Wiley, 2001-01-01) The X-ray diffraction has revealed that CuIn5S8 is a single phase crystal of cubic spinet structure. The value of the unit cell parameter for this crystal is 1.06736 nm. The crystal is assigned to the conventional space group Fd3m. The photocurrent is found to have the characteristic of monomolecular and bimolecular recombination at low and high illumination intensities, respectively. The electrical resistivity and Hall effect of CuIn5S8 crystals are measured in the temperature range of 50-400 K. The crysta...
Structural, electrical and optical properties of Ge implanted GaSe single crystals grown by Bridgman technique KARAAĞAÇ, HAKAN; Parlak, Mehmet; KARABULUT, ORHAN; SERİNCAN, UĞUR; Turan, Raşit; Akinoglu, B. G. (Wiley, 2006-12-01) Structural, optical and electrical properties of Ge implanted GaSe single crystal have been studied by means of X-Ray Diffraction (XRD), temperature dependent conductivity and photoconductivity (PC) measurements for different annealing temperatures. It was observed that upon implanting GaSe with Ge and applying annealing process, the resistivity is reduced from 2.1x10(9) to 6.5x10(5) ohm-em. From the temperature dependent conductivities, the activation energies have been found to be 4, 34, and 314 meV for a...

Citation Formats

Y. Zhou et al., “Structural Transitions in Cholesteric Liquid Crystal Droplets,” ACS NANO, pp. 6484–6490, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37923.