Self-constructed stable liquid crystal alignment in a monomer-liquid crystal mixture system

Lee, Seungho; Son, Jin-Young; Zin, Wang‐Cheol; Lee, Seung Hee; Song, Jang‐Kun

doi:10.1080/02678292.2012.693630

Cited by 25 publications

(3 citation statements)

References 12 publications

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“…The scattering pattern shows sprouting of Bragg peak which indicates progression of ordered structure possibly suggests viscous lamellar structures which is represented in Figures 1 and 3. [18] The Bragg peak at wave vector Q % 0.06 Å À1 which is the signature of the long range packing order of lamellar structure. [19] As per our calculation the bilayer thickness of the surfactant lamellar sheets was found to be 104.7 Å .…”

Section: Effect Of D 2 O Concentrationmentioning

confidence: 99%

Small-Angle Neutron Scattering Study of Nonionic Surfactant Micelles and Phase Transitions in w/o Microemulsion

Hegde

Kumar

Aswal

et al. 2014

Journal of Dispersion Science and Technology

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The structure of micelles formed by a four component water-in-oil nonionic microemulsion surfactant polyoxyethene (20) sorbitan monoleate (Tween 80), sorbitan monolaurate (Span 20) at ethyl oleate and deuterated water interface have been probed by small-angle neutron scattering (SANS). The total surfactant concentration in each of the samples studied (Tween 80: Span 20) is fixed at 3:2. The deuterated water content is variable at 5-60% w/w. The experimental SANS data from all the seven samples are fit well by spherical micelles interacting with hard sphere potential. Increased deuterated water leads to spherical to lamellar and rod-like micelle geometry featured in the SANS scattering data. The observed change in micelle geometry supports the characterization of phase transition between the self-assembled micelles of the nonionic microemulsion.

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Section: Effect Of D 2 O Concentrationmentioning

confidence: 99%

Small-Angle Neutron Scattering Study of Nonionic Surfactant Micelles and Phase Transitions in w/o Microemulsion

Hegde

Kumar

Aswal

et al. 2014

Journal of Dispersion Science and Technology

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“…Heating below 100 ℃ can cross-link OTS to form a stable monolayer. It can be patterned [16] and is suitable for one-bottle processes [17]. S. H. Lee and K. U. Jeong explored another approach based on nanoparticle-based giant surfactants.…”

Section: Introductionmentioning

confidence: 99%

P‐92: Photo‐sensitive Vertical Alignment Material with Room Temperature Dipcoating Technique

Yu,

Semenenko,

Vashchenko

et al. 2024

Symp Digest of Tech Papers

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Using a room‐temperature dip‐coating technique, we propose a cinnamate‐unit‐phosphonic‐acid‐based surfactant alignment material that can be orientated by linear polarized light. Using the technique, we can treat a substrate simply and quickly, achieving a uniform pretilt angle of approximately 86° with a low dose of polarized UV light. We examined the optical and electrical properties of the alignment material under different conditions, including pretilt angles under different irradiation doses, voltage holding ratio (VHR) and residual direct circuit (RDC) when using different solvents, stability, etc. The results show that the material has acceptable performance. Since the phosphonic acid series photosensitive materials still have much room for optimization, we believe it is a potential new generation of photosensitive surfactant alignment materials.

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“…Thermally and chemically stable polymers such as polyimides have been generally used as planar as well as vertical alignment materials. However, the polyimide-type alignment materials exhibit several drawbacks such as long process time, low yield, low processability, and high cost. ,, Without applying the conventional polyimide-based alignment layers, the LC alignment direction and the surface anchoring energy can be modified by directly introducing lecithins, silanes, or nanomaterials into the host NLC media. − Especially, the nanoparticle-induced vertical LC alignment layers are very attractive because of low driving voltage, memory effect, and frequency modulation response. − However, most nanoparticle-induced VA materials can generate serious problems because of poor interactions with NLC molecules and strong aggregations among themselves. As an example, by directly introducing 3 wt % pristine polyhedral oligomeric silsequioxane (POSS) nanoparticles in NLC host media, the automatic VA layer was constructed in the macroscopic area. − However, because of strong interactions among the pristine POSS nanoparticles, a lot of POSS clusters on the micrometer sizes were formed in the bulk NLC medium before the formation of monolayered VA layer on the substrates.…”

Section: Introductionmentioning

confidence: 99%

Photopolymerization of Reactive Amphiphiles: Automatic and Robust Vertical Alignment Layers of Liquid Crystals with a Strong Surface Anchoring Energy

et al. 2015

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A photopolymerizable itaconic acid-based amphiphile (abbreviated as Ita3C 12 ) consisting of a hydrophilic carboxylic acid, three alkyl tails, and a reactive vinyl function was newly designed and synthesized for the formation of automatic and robust vertical alignment (VA) layer of nematic liquid crystals (NLC). Since a hydrophilic carboxylic acid was chemically attached to the end of Ita3C 12 , the Ita3C 12 amphiphiles initially dissolved in the host NLC medium were migrated toward the substrates for the construction of VA layer of NLC. The alkyl tails of Ita3C 12 in the VA layer directly interacted with host NLC molecules and made them to automatically align vertically. Because of the reactive vinyl functions of Ita3C 12 amphiphiles, it was possible to stabilize the automatic VA layer by the photopolymerization with methacryl polyhedral oligomeric silsesquioxane (MAPOSS) cross-linkers. The polymer-stabilized robust Ita3C 12 VA layer exhibited a strong surface anchoring energy without generating any light scatterings. The automatic fabrication of robust LC alignment layers can allow us to reduce the manufacturing cost and to open new doors for electro-optical applications.

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Self-constructed stable liquid crystal alignment in a monomer-liquid crystal mixture system

Cited by 25 publications

References 12 publications

Small-Angle Neutron Scattering Study of Nonionic Surfactant Micelles and Phase Transitions in w/o Microemulsion

Small-Angle Neutron Scattering Study of Nonionic Surfactant Micelles and Phase Transitions in w/o Microemulsion

P‐92: Photo‐sensitive Vertical Alignment Material with Room Temperature Dipcoating Technique

Photopolymerization of Reactive Amphiphiles: Automatic and Robust Vertical Alignment Layers of Liquid Crystals with a Strong Surface Anchoring Energy

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