Commonly, one dimensional construct has a restriction of viewing angle. We report a new, simplistic strategy to Particle Photonic Crystal: an ellipsoidal block copolymer nanoparticles. It has a wider viewing angle and is easier to make. We made a particle of photonic crystal based on Poly Styrene-block-Poly-2-Vinyl Pyridine(PS-b-P2VP) in chloroform. After using Poly Vinyl Alcohol(PVA), it was in state of emulsion and self assembly method followed afterwards. In the first trial, we observed particle structure variation according to the difference in molecular weight such as 52k-57k, 75k-66.5k, 102k-97k. Afterwards, we exhibited how particle structure change by the addition of swelling solution (Alcohol). The molecular structure of particle photonic crystal was investigated by Transmission Electron Microscope. The color was measured by color-difference meter.
Recently, a transparent display has got much attention as one of the next generation display devices. Especially, active studies on a transparent display using organic light-emitting diodes (OLEDs) are in progress. However, since it is not possible to obtain black color using a transparent OLED, it suffers from poor visibility. This inevitable problem can be solved by using a light shutter. Light shutter technology can be divided into two types; light absorption and scattering. However, a light shutter based on light absorption cannot block the background image perfectly and a light shutter based on light scattering cannot provide black color. In this work we demonstrate a light shutter using two liquid crystal (LC) layers, a light absorption layer and a light scattering layer. To realize a light absorption layer and a light scattering layer, we use the planar state of a dye-doped chiral nematic LC (CNLC) cell and the focal-conic state of a long-pitch CNLC cell, respectively. The proposed light shutter device can block the background image perfectly and show black color. We expect that the proposed light shutter can increase the visibility of a transparent display.
Poly(styrene-b-2-vinyl pyridine) (PS-b-P2VP) lamellar film which is hydrophobic block hydrophilic polyelectrolyte
block polymer of 52 kg/mol -b- 57 kg/mol and PS-b-P2VP film with reactive monomer (RM257) were prepared for
photonic gel films. The lamellar stacks, which is alternating layer of hydrophilic and hydrophobic part of PS-b-P2VP.
We reported about the influence of reactive monomer on those photonic gel films. Added reactive monomer photonic gel
film had higher absorbance than pure photonic gel films. And band gaps of the lamellar films shifted by the time of UV
light irradiation. That Photonic gel films were measured with the UV spectrophotometer. As a result the photonic gel
film with reactive monomer had more clear color. The lamellar films were swollen by DI water, Ethyl alcohol (aq) and
calcium carbonate solution. Since the domain spacing of dried photonic gel films were not showing any color in visible
wavelength. The band gap of the lamellar films were drastically shifted to longer wavelength swollen by calcium
carbonate solution (absorbance peak 565nm→617nm). And the lamellar films were shifted to shorter wave length
swollen by ethanol (absorbance peak 565nm→497nm). So each Photonic gel film showed different color.
Block copolymers have drawn increasing attention for fabricating functional nanomaterials due to their properties of
self-assembly. In particular, photonic crystals hold promise for multiple optical applications. We prepared 1D photonic
crystals with polystyrene-b-poly(2-vinyl pyridine) (PS-b-P2VP) lamellar films which is hydrophobic block-hydrophilic
polyelectrolyte block polymer of 57 kg /mol-b-57 kg/mol. The lamellar stacks, which are alternating layers of
hydrophilic and hydrophobic moiety of PS-b-P2VP, are obtained by exposing the spin coated film under chloroform
vapor. The band gaps of the lamellar films interestingly varied after immersion into the quaternizing solvents containing
5wt% of iodomethane solubilized in n-hexane. We demonstrate about the influence of UV light on those photonic gel
films. To study of different properties of films, UV-visible absorption spectra were measured as a different UV
irradiation time at swollen films with distilled water. The UV-visible maximum absorption spectra shifted by UV
irradiation time. Dependent on the time of UV irradiations, we can change the photonic band gap.
Photosensitive polyimide containing 2-methoxy cinnamate was synthesized for photo-alignment layer of liquid crystals
(LCs). 2-Methoxy cinnamic acid was confirmed photo-sensitive material by linearly polarized UV light. We studied that
effect of polarized UV light on rubbed polyimide film. Anchoring energy of liquid crystal with aligning surface was
measured. Irradiation of depolarized UV light on rubbed Polyimide film suppressed effective anchoring energy. Linearly
polarized UV light on rubbed polyimide film controlled anchoring energy effectively. Polyimide film containing 2-methoxy cinnamate can control the photo-alignment layer easily due to its photo-sensitivity.
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