Perfluoropolymer Surface for Shock‐free Homeotropic Alignment of Smectic Liquid Crystals

Jeong, Soon Moon; Kim, Jin Ki; Shimbo, Yoshio; Araoka, Fumito; Dhara, Surajit; Ha, Na Young; Ishikawa, Ken; Takezoe, Hideo

doi:10.1002/adma.200901777

Cited by 27 publications

(23 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1a). The ITO glass is spin-coated with an amorphous fluorinated polymer, CYTOP (CTX-809A, Asahi Glass Co.), dissolved in a fluorinated solvent (CT-Solv.180, Asahi Glass Co.) to induce the homeotropic anchoring4445. An AC voltage of V = V 0 cos2 πft is applied to the ITO electrodes in order to induce the reorientation of n (Fig.…”

Section: Resultsmentioning

confidence: 99%

Large-scale self-organization of reconfigurable topological defect networks in nematic liquid crystals

et al. 2016

Self Cite

View full text Add to dashboard Cite

Topological defects in nematic liquid crystals are ubiquitous. The defects are important in understanding the fundamental properties of the systems, as well as in practical applications, such as colloidal self-assembly, optical vortex generation and templates for molecular self-assembly. Usually, spatially and temporally stable defects require geometrical frustration imposed by surfaces; otherwise, the system relaxes because of the high cost of the elastic energy. So far, multiple defects are kept in bulk nematic liquid crystals by top-down lithographic techniques. In this work, we stabilize a large number of umbilical defects by doping with an ionic impurity. This method does not require pre-patterned surfaces. We demonstrate that molecular reorientation controlled by an AC voltage induces periodic density modulation of ions accumulated at an electrically insulating polymer interface, resulting in self-organization of a two-dimensional square array of umbilical defects that is reconfigurable and tunable.

show abstract

Section: Resultsmentioning

confidence: 99%

Large-scale self-organization of reconfigurable topological defect networks in nematic liquid crystals

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…These plates were spin coated with perfluoropolymer, poly [perfluoro (4-vinyloxy -1-butene)], known as CYTOP. A solution was prepared by adding 1 part of CTX-809A to 2 parts of CT-Solv.180 by weight 39 and these were obtained from Asahi Glass Co., Ltd. Japan. The CYTOP coated glass plates were cured at 100 • C for 30 min.…”

Section: Methodsmentioning

confidence: 99%

Effect of smectic short-range order on the discontinuous anchoring transition in nematic liquid crystals

Sai

Kumar

Haase

et al. 2014

The Journal of Chemical Physics

Self Cite

View full text Add to dashboard Cite

We report studies on the temperature dependent alignment behavior of a homologous series of trans, trans- 4, 4'-dialkyl-(1α,1' α-bicyclohexyl)-4β-carbonitrile (CCNs) on a perfluoropolymer coated cells. Among six compounds in the series, one (CCN-35) has only nematic phase and the remaining five have either smectic-A or smectic-B in addition to the nematic phase. We simultaneously performed temperature dependent dielectric measurements and optical polarising microscope observation. It is found that except for CCN-35 and CCN-73, the remaining four compounds exhibit discontinuous anchoring transition from planar to homeotropic and vice versa with increasing thermal hysteresis. We developed a simple theory taking into account the effect of smectic short-range order at the substrates to explain the experimental observations.

show abstract

“…Both multireflectors shown in Figure 1a and 1b consist of a polymeric nematic liquid crystal (PNLC) film with an optical anisotropy and two kinds of isotropic film of poly(vinyl alcohol) (PVA) and poly[perfluoro(4-vinyloxy-1-butene)] (PPFVB) called CYTOP. Here, the PPFVB film was chosen because of its low refractive index of 1.34, [13] i.e., a high index contrast compared to those of the other two DOI: 10.1002/adma.200903415 Figure 1. Structures of two tunable multireflectors.…”

mentioning

confidence: 99%

“…[13,14] The PVA film is not only a functional layer contributing to the optical performance but also an alignment layer of upper or lower PNLC layer. Finally, the presence of optical anisotropy in the PNLC film is a key factor for tuning spectral characteristics of the multiple PBGs.…”

mentioning

confidence: 99%

“…Both multireflectors shown in Figure 1a and 1b consist of a polymeric nematic liquid crystal (PNLC) film with an optical anisotropy and two kinds of isotropic film of poly(vinyl alcohol) (PVA) and poly[perfluoro(4vinyloxy-1-butene)] (PPFVB) called CYTOP. Here, the PPFVB film was chosen because of its low refractive index of 1.34, [13] i.e., a high index contrast compared to those of the other two polymers [12] and high resistance to chemical and thermal stimuli. [13,14] The PVA film is not only a functional layer contributing to the optical performance but also an alignment layer of upper or lower PNLC layer.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Color‐ and Reflectance‐Tunable Multiple Reflectors Assembled from Three Polymer Films

Jeong

Nishimura

et al. 2010

Advanced Materials

Self Cite

View full text Add to dashboard Cite

show abstract

Perfluoropolymer Surface for Shock‐free Homeotropic Alignment of Smectic Liquid Crystals

Cited by 27 publications

References 28 publications

Large-scale self-organization of reconfigurable topological defect networks in nematic liquid crystals

Large-scale self-organization of reconfigurable topological defect networks in nematic liquid crystals

Effect of smectic short-range order on the discontinuous anchoring transition in nematic liquid crystals

Color‐ and Reflectance‐Tunable Multiple Reflectors Assembled from Three Polymer Films

Contact Info

Product

Resources

About