Fullerene-Based Nanosurfactant for the Automatic Homeotropic Alignment of Liquid Crystals

Park, Minwook; Kim, Jongyoon; Yoon, Won‐Jin; Lim, Seok‐In; Rim, Minwoo; Wi, Youngjae; Jang, Junhwa; Oh, Mintaek; Lee, Jihoon; Jeong, Kwang‐Un

doi:10.1021/acsanm.3c00394

ACS Appl. Nano Mater.

2023

DOI: 10.1021/acsanm.3c00394

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Fullerene-Based Nanosurfactant for the Automatic Homeotropic Alignment of Liquid Crystals

Minwook Park

Jongyoon Kim

Won‐Jin Yoon

et al.

Abstract: Chemically functionalized organic–inorganic hybrid nanoparticles have significant benefits for automatic liquid crystal (LC) alignment but are still limited to well-balanced self-assembly without wasting materials and deleterious aggregation for LC display. In this paper, we propose a promising homeotropic alignment (HA) guide nanosurfactant (C60D) consisting of different distinct molecular segments in LC affinity. By doping C60D into a nematic LC medium, the HA nanolayer is automatically constructed on the su… Show more

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Cited by 5 publications

References 30 publications

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

Yu,

Semenenko,

Vashchenko

et al. 2024

Symp Digest of Tech Papers

View full text Add to dashboard Cite

show abstract

Hierarchical Nanostructures Constructed by Soft Epitaxial Self‐Assembly of Organic‐Inorganic Hybrid Giant Amphiphiles

Kang,

Kook,

Kim

et al. 2024

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Abstract2D nanomaterials with ångström‐scale thicknesses offer a unique platform for confining molecules at an unprecedentedly small scale, presenting novel opportunities for modulating material properties and probing microscopic phenomena. In this study, mesogen‐tethered polyhedral oligomeric silsesquioxane (POSS) amphiphiles with varying numbers of mesogenic tails to systematically influence molecular self‐assembly and the architecture of the ensuing supramolecular structures, are synthesized. These organic‐inorganic hybrid amphiphiles facilitate precise spatial arrangement and directional alignment of the primary molecular units within highly ordered supramolecular structures. The correlation between molecular design and the formation of superlattices through comprehensive structural analyses, incorporating molecular thermodynamics and kinetics, is explored. The distinct intermolecular interactions of the POSS core and the mesogenic tails drive the preferential formation of a 2D inorganic sublattice while simultaneously guiding the hierarchical assembly of organic lamellae via soft epitaxy. The findings reveal the intricate balance between shape, size, and interaction strengths of the inorganic and organic components, and how these factors collectively influence the structural hierarchy of the superstructures, which consist of multiple sublattices. By controlling this unique molecular behavior, it is possible to modulate or maximize the anisotropy of optical, mechanical, and electrical properties at the sub‐nanometer scale for nanotechnology applications.

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A Multi‐Functional Molecule for Highly Durable, Bending‐Resistant, Low‐Voltage Driving PSLC Films toward Smart Windows With Radiative Cooling

Shi,

Song,

et al. 2024

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Polymer‐stabilized liquid crystals (PSLCs) are widely used in smart windows, light modulators, and dimmed glass. However, their low mechanical strength, unsatisfactory electro‐optical properties, and poor durability limit their large‐scale application. In this study, a PSLC film with outstanding performance is prepared by incorporating a multifunctional molecule into a fine‐sculptured liquid crystal/polymer composite. The multifunctional molecule is designed to form a vertically oriented layer with a silane coupling agent through a two‐step self‐assembly process and improve the mechanical strength of PSLCs by connecting the polymer networks through covalent bonds. In addition, it endowed the film with good thermal stability through the reversible change from hydrogen bonds at low temperatures to C═N bonds at high temperatures. A PSLC film with ultralow saturation voltage (Vsat < 25 V), wide operating temperature and viewing angle performance, high mechanical strength (60–100% improvement), and high stability (15 000 cycles) is prepared through the self‐assembly of the multifunctional molecule followed by photomask‐assisted photopolymerization. Finally, a bending‐resistant, flexible PSLC film with passive radiative cooling capacity is tested and achieved excellent temperature management. This composite film demonstrated superior performance in every aspect, promoting the application of PSLCs in smart windows for cars and buildings.

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Fullerene-Based Nanosurfactant for the Automatic Homeotropic Alignment of Liquid Crystals

Cited by 5 publications

References 30 publications

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

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

Hierarchical Nanostructures Constructed by Soft Epitaxial Self‐Assembly of Organic‐Inorganic Hybrid Giant Amphiphiles

A Multi‐Functional Molecule for Highly Durable, Bending‐Resistant, Low‐Voltage Driving PSLC Films toward Smart Windows With Radiative Cooling

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