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Your search keyword '"Gutierrez-Cuevas, Karla G."' showing total 15 results
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15 results on '"Gutierrez-Cuevas, Karla G."'

3. Electro- And Photo-Driven Orthogonal Switching Of A Helical Superstructure Enabled By An Axially Chiral Molecular Switch

Author

Zhang, Xinfang, Koz, Banu, Bisoyi, Hari Krishna, Wang, Hao, Gutierrez-Cuevas, Karla G., McConney, Michael E., Bunning, Timothy J., and Li, Quan

Abstract

Self-organized functional soft materials, enabled by specific chemical architectures, are currently attracting tremendous attention because of their stimuli-responsive attributes and applications in advanced technological devices. A novel axially chiral molecular switch containing two azo linkages and six terminal allcyl chains on two elongated rod-shaped wings, that exhibits superior solubility, high helical twisting power, and reversible photoisomerization in an achiral liquid crystal host, is synthesized and utilized in the development of a photoresponsive, self-organized helical superstructure, that is, cholesteric liquid crystal (CLC). The planar CLC adopts a standing helix (SH) configuration because of surface alignment layers on the substrates. This SH can be transitioned to a lying helix configuration, enabling tunable diffraction gratings under the application of electric field. Adjustment of the initial pitch of the planar CLC by photoirradiation yields the diffraction gratings with stripes either parallel or perpendicular to the rubbing direction upon the application of an appropriate electric field. Tunable beam steering along orthogonal directions has been demonstrated. Such tunable stimuli-responsive soft materials fabricated with artificial chiral switches show great potential in optics, photonics, and beyond.

Published
2020

6. Fluorescent Photochromic α‐Cyanodiarylethene Molecular Switches: An Emerging and Promising Class of Functional Diarylethene.

Author

Lin, Siyang, Gutierrez‐Cuevas, Karla G., Zhang, Xinfang, Guo, Jinbao, and Li, Quan

Subjects
*MOLECULAR switches, *PHOTOCHROMISM, *DIARYLETHENE, *SMART materials, *LIQUID crystals, *APPROPRIATE technology
Abstract

Fluorescent photochromic molecules that exhibit distinct light‐triggered changes in their emission colors are highly desirable for the fabrication of smart soft materials and advanced photonic devices. α‐Cyanodiarylethenes, that is, α‐cyano‐functionalized diarylethenes, as alternative "non‐azo" Z/E photochromic molecular switches, are popular choices due to their unique characteristics such as their aggregation‐induced emission or aggregation‐induced‐enhanced emission behavior in their self‐assembled states, and visible changes in fluorescence colors during Z/E photoisomerization. In recent years, the development of fluorescent photochromic α‐cyanodiarylethene‐based compounds including α‐cyanostilbenes, dicyanodistyrylbenzenes, and diaryldicyanoethenes, has mainly focused on molecular design, photochemical and photophysical behavior in solution, and smart soft matter technologies. In this review, recent significant achievements in light‐responsive systems based on the Z/E photoisomerization of fluorescent photochromic α‐cyanodiarylethene switches that span the range from liquid crystals to gels and finally to self‐assembled nanostructures, are highlighted. The smart soft materials constructed from α‐cyanodiarylethene molecular switches find use in a plethora of areas, including display, sensing, encrypting, actuating, and biomedical imaging applications, among others. The review concludes with a brief perspective on some major challenges and opportunities for the future development of light‐responsive smart soft photonic materials. [ABSTRACT FROM AUTHOR]

Published
2021
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15. Thermally reversible full color selective reflection in a self-organized helical superstructure enabled by a bent-core oligomesogen exhibiting a twist-bend nematic phaseElectronic supplementary information (ESI) available: Synthesis and characterization of materials. See DOI: 10.1039/c6mh00101g

Author

WangThese authors contributed equally to this work., Yuan, Zheng, Zhi-gang, Bisoyi, Hari Krishna, Gutierrez-Cuevas, Karla G., Wang, Ling, Zola, Rafael S., and Li, Quan

Abstract

A self-organized helical superstructure was found to exhibit thermally tunable, reversible selective reflection of light across the whole visible region upon doping with an achiral bent-core hybrid trimer having a twist-bend nematic phase.

Published
2016
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