Photonic time-temperature sensor having an embossed interpenetrating network of cholesteric liquid crystalline polymers and a secondary polymer

Photonic time-temperature sensor consisting of an embossed interpenetrating network of a cholesteric liquid crystalline polymers and a secondary polymer. Preferably in which the secondary polymer is orthogonal and is not covalently attached to the interpenetrating network, but physically interpenetrated therein. For use as food sensor for checking freshness of the food

Smectic hybrid oligo(dimethylsiloxane) liquid crystal for nanopatterning

Block copolymer self-assembly is a candidate resolution enhancement technique for patterning at future technology nodes. The technology is based on the micro-phase separation of chemically immiscible (eg polar/apolar) block copolymers that contain etch contrast (eg. organic/inorganic) into regular patterns (eg. lamellar or cylindrical) with periodicities between 10 - 100 nm. One of the challenges that remain for the implementation of self-assembly in nanopatterning is extendibility of the technology to smaller features. In contrast to block copolymers, liquid crystals are able to self-assemble at the molecular length scale (1-10 nm). The current work reports on a liquid crystal with inherent etch contrast and its self-assembly behavior. A monodisperse oligo(dimethylsiloxane) liquid crystal is synthesized via hydrosilylation and characterized. The formation of a temperature dependent tilted smectic phase with a periodicity of approximately 3.0 nm is demonstrated via differential scanning calorimetry, polarized optical microscopy, and x-ray diffraction. The director tilt is highly dependent on temperature (20° - 70°), while the layer spacing is relatively temperature independent (2.99 - 3.03 nm). Finally, we show that the liquid crystal forms lamellar sheets in thin films.</p

Directed self-assembly of liquid-crystalline molecular building blocks for sub-5 nm nanopatterning

The thin-film directed self-assembly of molecular building blocks into oriented nanostructure arrays enables next-generation lithography at the sub-5 nm scale. Currently, the fabrication of inorganic arrays from molecular building blocks is restricted by the limited long-range order and orientation of the materials, as well as suitable methodologies for creating lithographic templates at sub-5 nm dimensions. In recent years, higher-order liquid crystals have emerged as functional thin films for organic electronics, nanoporous membranes, and templated synthesis, which provide opportunities for their use as lithographic templates. By choosing examples from these fields, recent progress toward the design of molecular building blocks is highlighted, with an emphasis on liquid crystals, to access sub-5 nm features, their directed self-assembly into oriented thin films, and, importantly, the fabrication of inorganic arrays. Finally, future challenges regarding sub-5 nm patterning with liquid crystals are discussed

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Sub-5 nm structured films by hydrogen bonded siloxane liquid crystals and block copolymers

This paper describes the synthesis and characterization of a novel class of hydrogen-bonding oligo(dimethylsiloxane)-based thermotropic liquid crystals (LCs), with which polymeric supramolecules were obtained with glassy smectic and columnar sub-5 nm features when combined with poly(4-vinylpyridine) homopolymer or poly(styrene)-b-poly(4-vinylpyridine) block copolymer (BCP). The hierarchical self-assembly afforded by the LC/BCP complexes further resulted in the vertical orientation of the LC features in thin films

Reactive oligo(dimethylsiloxane) mesogens and their nanostructured thin films

Oligo(dimethylsiloxane)-based reactive mesogens were prepared and shown to form room-temperature smectic phases which were 'frozen-in' by photopolymerization. Homeotropically aligned, nanostructured thin films were obtained by spincoating, and micropatterning was demonstrated. These hybrid reactive mesogens are suitable for the preparation of aligned nanostructured polymer thin films with potential applications ranging from stimuli responsive coatings to nanoporous membranes

Sub-5 nm structured films by hydrogen bonded siloxane liquid crystals and block copolymers

\u3cp\u3eThis paper describes the synthesis and characterization of a novel class of hydrogen-bonding oligo(dimethylsiloxane)-based thermotropic liquid crystals (LCs), with which polymeric supramolecules were obtained with glassy smectic and columnar sub-5 nm features when combined with poly(4-vinylpyridine) homopolymer or poly(styrene)-b-poly(4-vinylpyridine) block copolymer (BCP). The hierarchical self-assembly afforded by the LC/BCP complexes further resulted in the vertical orientation of the LC features in thin films.\u3c/p\u3

Reactive oligo(dimethylsiloxane) mesogens and their nanostructured thin films

\u3cp\u3eOligo(dimethylsiloxane)-based reactive mesogens were prepared and shown to form room-temperature smectic phases which were 'frozen-in' by photopolymerization. Homeotropically aligned, nanostructured thin films were obtained by spincoating, and micropatterning was demonstrated. These hybrid reactive mesogens are suitable for the preparation of aligned nanostructured polymer thin films with potential applications ranging from stimuli responsive coatings to nanoporous membranes.\u3c/p\u3