Fiber‐Oriented Liquid Crystal Polarizers Based on Anisotropic Electrospinning

Yao, Yingfang; Gu, Zhongze; Zhang, Jizhong; Pan, Chao; Zhang, Yiyun; Wei, Hongmei

doi:10.1002/adma.200701212

Cited by 37 publications

(22 citation statements)

References 27 publications

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“…The second possibility might be to make a layered composite that encompasses the key elements of the POM setup that we are using here, but in a wearable format. While this is clearly more challenging, linear polarizers have been made by electrospinning, 59 and hence the LC-functionalized fibers could be placed between two such sheets of polarizing fibers to create the crossed-polarizer geometry, while still ensuring good contact with the air in order that the VOC can enter the fibers. The lamp of the POM would most naturally be replaced by ambient light, and the detector and colorimetric analysis could be conveniently carried out by using organic photovoltaic cells on the inside of the composite structure: Kang et al.…”

Section: Discussionmentioning

confidence: 99%

Quantitative volatile organic compound sensing with liquid crystal core fibers

Schelski

Pschyklenk

Kaul

et al. 2021

Cell Reports Physical Science

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Summary Polymer fibers with liquid crystals (LCs) in the core have potential as autonomous sensors of airborne volatile organic compounds (VOCs), with a high surface-to-volume ratio enabling fast and sensitive response and an attractive non-woven textile form factor. We demonstrate their ability to continuously and quantitatively measure the concentration of toluene, cyclohexane, and isopropanol as representative VOCs, via the impact of each VOC on the LC birefringence. The response is fully reversible and repeatable over several cycles, the response time can be as low as seconds, and high sensitivity is achieved when the operating temperature is near the LC-isotropic transition temperature. We propose that a broad operating temperature range can be realized by combining fibers with different LC mixtures, yielding autonomous VOC sensors suitable for integration in apparel or in furniture that can compete with existing consumer-grade electronic VOC sensors in terms of sensitivity and response speed.

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Section: Discussionmentioning

confidence: 99%

Quantitative volatile organic compound sensing with liquid crystal core fibers

Schelski

Pschyklenk

Kaul

et al. 2021

Cell Reports Physical Science

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“…Poly lactic-co-glycolic acid (PLGA; viscosity 1.64 dL/g; Changchun Sibobiomaterials, China) was dissolved in trifluoroethanol at a concentration of 15% (w/v) by stirring for 3–4 h. The electrospinning apparatus used in this study was operated according to procedures previously described [30]. Briefly, one 1 mL syringe fitted with a stainless-steel blunt needle was connected to a high-voltage power supply and placed perpendicularly to the collector with a distance of 15 cm.…”

Section: Methodsmentioning

confidence: 99%

Regulation of Fibrochondrogenesis of Mesenchymal Stem Cells in an Integrated Microfluidic Platform Embedded with Biomimetic Nanofibrous Scaffolds

et al. 2013

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In native fibrocartilage, mechanotransduction allows the cells to perceive the physical microenvironment not only through topographical cues from the extracellular matrix, but also through mechanical cues, such as interstitial flow. To create a microenvironment that simultaneously integrates nanotopography and flow stimulus, we developed a biomimetic microfluidic device embedded with aligned nanofibers to contain microchambers of different angles, which enabled the flow direction to form different angles with the fibers. Using this device, we investigated the effects of microfluidic and nanotopographical environment on the morphology and fibrochondrogenesis of mesenchymal stem cells (MSCs) and the involvement of RhoA/ROCK pathway and Yes-associated protein (YAP)/transcriptional co-activator with PDZ-binding motif (TAZ). The results showed that the flow direction perpendicular to aligned nanofibers was conducive to fibrochondrogenesis of MSCs. In addition, ROCK inhibitor and knockdown of YAP/TAZ disrupted fibrochondrogenic differentiation of MSCs. In conclusion, our data suggest the crucial role of mechanotransduction in regulating fibrochondrogenic differentiation of MSCs, which may be mediated by RhoA/ROCK pathway and YAP/TAZ.

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“…The first use of electrospun fibers in a polarizer was shown by Katta et al by creating a fiber-oriented liquid crystal polarizer [304]. Electrospun PMMA fibers were aligned by using a rotating drum and had a diameter of 236 nm with a mat thickness of 5.3 μm.…”

Section: Polarizersmentioning

confidence: 99%

Electrospinning for nano- to mesoscale photonic structures

et al. 2016

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Abstract:The fabrication of photonic and electronic structures and devices has directed the manufacturing industry for the last 50 years. Currently, the majority of small-scale photonic devices are created by traditional microfabrication techniques that create features by processes such as lithography and electron or ion beam direct writing. Microfabrication techniques are often expensive and slow. In contrast, the use of electrospinning (ES) in the fabrication of microand nano-scale devices for the manipulation of photons and electrons provides a relatively simple and economic viable alternative. ES involves the delivery of a polymer solution to a capillary held at a high voltage relative to the fiber deposition surface. Electrostatic force developed between the collection plate and the polymer promotes fiber deposition onto the collection plate. Issues with ES fabrication exist primarily due to an instability region that exists between the capillary and collection plate and is characterized by chaotic motion of the depositing polymer fiber. Material limitations to ES also exist; not all polymers of interest are amenable to the ES process due to process dependencies on molecular weight and chain entanglement or incompatibility with other polymers and overall process compatibility. Passive and active electronic and photonic fibers fabricated through the ES have great potential for use in light generation and collection in optical and electronic structures/ devices. ES produces fiber devices that can be combined with inorganic, metallic, biological, or organic materials for novel device design. Synergistic material selection and postprocessing techniques are also utilized for broad-ranging applications of organic nanofibers that span from biological to electronic, photovoltaic, or photonic. As the ability to electrospin optically and/or electronically active materials in a controlled manner continues to improve, the complexity and diversity of devices fabricated from this process can be expected to grow rapidly and provide an alternative to traditional resource-intensive fabrication techniques.

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Fiber‐Oriented Liquid Crystal Polarizers Based on Anisotropic Electrospinning

Cited by 37 publications

References 27 publications

Quantitative volatile organic compound sensing with liquid crystal core fibers

Quantitative volatile organic compound sensing with liquid crystal core fibers

Regulation of Fibrochondrogenesis of Mesenchymal Stem Cells in an Integrated Microfluidic Platform Embedded with Biomimetic Nanofibrous Scaffolds

Electrospinning for nano- to mesoscale photonic structures

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