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Journal articles on the topic 'Photochromic Gels'

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Author: Grafiati

Published: 6 September 2023

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1

Moraes, Thaisa B. F., Marcos F. R. A. Schimidt, Rebeca Bacani, Gabriel Weber, Mario J. Politi, Bruna Castanheira, Sergio Brochsztain, Francisco de A. Silva, Grégoire J. F. Demets, and Eduardo R. Triboni. "Polysilsesquioxane naphthalenediimide thermo and photochromic gels." Journal of Luminescence 204 (December 2018): 685–91. http://dx.doi.org/10.1016/j.jlumin.2018.08.036.

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2

Bobrovsky, Alexey, Valery Shibaev, Věra Hamplová, Vladimíra Novotna, and Miroslav Kašpar. "Photochromic and fluorescent LC gels based on a bent-shaped azobenzene-containing gelator." RSC Advances 5, no. 70 (2015): 56891–95. http://dx.doi.org/10.1039/c5ra07234d.

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3

Taniguchi, Takuya, Toru Asahi, and Hideko Koshima. "Photomechanical Azobenzene Crystals." Crystals 9, no. 9 (August 22, 2019): 437. http://dx.doi.org/10.3390/cryst9090437.

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Photomechanically responsive materials are promising candidates for future smart actuator applications. The photo-responsive behaviors originate from the photoisomerization of photochromic molecules. A typical photochromic compound, azobenzene, has been studied extensively in the solution state and has played a crucial role in the photomechanical behaviors of materials such as polymers and gels, via chemical bridging with their matrix. In contrast to polymers and gels, the photomechanical attributes of molecular crystals have not progressed to the same degree, due to their rigidity and fragility. However, the past decade has witnessed an increasing number of reports of the photomechanical motion of molecular crystals, including azobenzene crystals. This paper reviews the current state-of-the-art of mechanically responsive azobenzene crystals, including the history, crystal design strategy, and future promising applications.

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4

Zhang, Yuzhi, Jiaguo Yuan, Yunzhen Cao, Lixin Song, and Xingfang Hu. "Photochromic behavior of Li-stabilized MoO3 sol–gels." Journal of Non-Crystalline Solids 354, no. 12-13 (February 2008): 1276–80. http://dx.doi.org/10.1016/j.jnoncrysol.2006.11.035.

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5

Gao, Jie, Wen‐Da Zhang, Lin‐Lin Wang, Yu‐Xuan Chen, Ya‐Xiang Shi, Wei Ji, Zexiao Xu, Xiaodong Yan, and Zhi‐Guo Gu. "Ultrafast Photochromic Self‐Healing Polymer Gels with Tunable Fluorescence." Macromolecular Materials and Engineering 307, no. 3 (November 30, 2021): 2100758. http://dx.doi.org/10.1002/mame.202100758.

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6

Hania, P. R., A. Pugžlys, L. N. Lucas, J. J. D. de Jong, J. van Esch, B. Feringa, and K. Duppen. "Reaction Dynamics and Applications in Patterning of Bisthienylcyclopentene-Based Photochromic Switches." Solid State Phenomena 97-98 (April 2004): 207–14. http://dx.doi.org/10.4028/www.scientific.net/ssp.97-98.207.

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The structural and optical properties of the gel-forming photochromic switch 1,2-bis(2’-methyl-5’-{{((R) phenylethyl)amino}carbonyl}thienyl-3’-yl)cyclopentene are studied by means of the linear absorption and holographic grating techniques. The use of diffractive optics enables recording of holographic gratings with high long-term phase stability. The diffraction efficiency of the recorded holographic gratings approach values of 30% for low writing beam energies when diffusion is the rate determining factor. At higher writing pulse energies the competition between the diffusion and photodecomposition processes causes lower diffraction efficiencies. At irradiation doses above 10 mJ the spatial profile of the recorded gratings is strongly influenced by saturation effects. Because of the well-determined grating profile the holographic grating technique is potentially applicable for the quantitative characterisation of the diffusion process in photochromic gels.

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7

Nakao, Ren, Norikazu Ueda, Yasuo Abe, Toyokazu Horii, and Hiroo Inoue. "New photochromic inorganic/organic hybrid siloxane gels with chemically bonded spirobenzopyran moiety." Polymers for Advanced Technologies 5, no. 4 (April 1994): 240–41. http://dx.doi.org/10.1002/pat.1994.220050407.

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8

Hou, L., B. Hoffmann, M. Mennig, and H. Schmidt. "Preparation and photochromic properties of dye-doped aluminosilicate and ORMOCER gels and coatings." Journal of Sol-Gel Science and Technology 2, no. 1-3 (1994): 635–39. http://dx.doi.org/10.1007/bf00486324.

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9

Moriyama, M., N. Mizoshita, T. Yokota, K. Kishimoto, and T. Kato. "Photoresponsive Anisotropic Soft Solids: Liquid-Crystalline Physical Gels Based on a Chiral Photochromic Gelator." Advanced Materials 15, no. 16 (August 15, 2003): 1335–38. http://dx.doi.org/10.1002/adma.200305056.

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10

Wang, Zhongchun, Xingfang Hu, and Ulf Helmersson. "Peroxo sol–gel preparation: photochromic/electrochromic properties of Mo–Ti oxide gels and thin films." Journal of Materials Chemistry 10, no. 10 (2000): 2396–400. http://dx.doi.org/10.1039/b004933f.

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11

Gao, Zongpeng, Luntao Liu, Zheng Tian, Zhenyu Feng, Baolai Jiang, and Wenshou Wang. "Fast-Response Flexible Photochromic Gels for Self-Erasing Rewritable Media and Colorimetric Oxygen Indicator Applications." ACS Applied Materials & Interfaces 10, no. 39 (September 19, 2018): 33423–33. http://dx.doi.org/10.1021/acsami.8b09825.

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12

Periyasamy, Aravin Prince, Mohanapriya Venkataraman, Dana Kremenakova, Jiri Militky, and Yan Zhou. "Progress in Sol-Gel Technology for the Coatings of Fabrics." Materials 13, no. 8 (April 14, 2020): 1838. http://dx.doi.org/10.3390/ma13081838.

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The commercial availability of inorganic/organic precursors for sol-gel formulations is very high and increases day by day. In textile applications, the precursor-synthesized sol-gels along with functional chemicals can be deposited onto textile fabrics in one step by rolling, padding, dip-coating, spraying or spin coating. By using this technology, it is possible to provide fabrics with functional/multi-functional characteristics including flame retardant, anti-mosquito, water- repellent, oil-repellent, anti-bacterial, anti-wrinkle, ultraviolet (UV) protection and self-cleaning properties. These surface properties are discussed, describing the history, basic chemistry, factors affecting the sol-gel synthesis, progress in sol-gel technology along with various parameters controlling sol-gel technology. Additionally, this review deals with the recent progress of sol-gel technology in textiles in addressing fabric finishing, water repellent textiles, oil/water separation, flame retardant, UV protection and self-cleaning, self-sterilizing, wrinkle resistance, heat storage, photochromic and thermochromic color changes and the improvement of the durability and wear resistance properties.

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13

Biteau, John, Frédéric Chaput, and Jean-Pierre Boilot. "Photochromism of Spirooxazine-Doped Gels." Journal of Physical Chemistry 100, no. 21 (January 1996): 9024–31. http://dx.doi.org/10.1021/jp953607o.

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14

Preston, Deborah, Jean Claude Pouxviel, Thomas Novinson, William C. Kaska, Bruce Dunn, and Jeffrey I. Zink. "Photochromism of spiropyrans in aluminosilicate gels." Journal of Physical Chemistry 94, no. 10 (May 1990): 4167–72. http://dx.doi.org/10.1021/j100373a054.

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15

Le′austic, Anne, Agnès Dupont, Pei Yu, and Rene′ Cle′ment. "Photochromism of cationic spiropyran-doped silica gels." New Journal of Chemistry 25, no. 10 (2001): 1297–301. http://dx.doi.org/10.1039/b104456g.

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16

Sun, Xiaodong, Meigong Fan, and Edward T. Knobbe. "Photochromism as a Probe of Gellation in Aluminosilicate Gels Doped with Spirooxazine." Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 297, no. 1 (May 1997): 57–64. http://dx.doi.org/10.1080/10587259708036103.

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17

Matsumoto, Taki, Yasushi Murakami, and Yoshio Takasu. "Photochromism of Titanium Oxide Gels Prepared by the Salt-Catalytic Sol-Gel Process." Chemistry Letters 29, no. 4 (April 2000): 348–49. http://dx.doi.org/10.1246/cl.2000.348.

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18

Nogami, M., and Y. Abe. "Photochromism of spiropyran and diarylethenedoped silica gels prepared by the sol-gel process." Journal of Materials Science 30, no. 22 (November 1995): 5789–92. http://dx.doi.org/10.1007/bf00356722.

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19

Nogami, M., and T. Sugiura. "Photochromism of spiropyran doped in Al2O3-SiO2 gels prepared by the sol-gel process." Journal of Materials Science Letters 12, no. 19 (January 1993): 1544–46. http://dx.doi.org/10.1007/bf00277092.

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20

Kuboyama, Keiichi, Kazuhiro Hara, and Kazumi Matsushige. "Enhancement of Photochromism in Tungstic Acid Gels with Some Organic Additives: Effects of End Groups." Japanese Journal of Applied Physics 33, Part 1, No. 7A (July 15, 1994): 4135–36. http://dx.doi.org/10.1143/jjap.33.4135.

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21

Shin, Yong Tak, Min Ji Lee, Kyung Sook Cho, and Ki Chang Song. "Effect of Colloidal Silica on the Photochromic Properties of Hard Coating Films Prepared by Sol-Gel Method." Korean Chemical Engineering Research 49, no. 5 (October 1, 2011): 535–40. http://dx.doi.org/10.9713/kcer.2011.49.5.535.

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22

Leistner, Anna-Lena, Mario M. Most, and Zbigniew Pianowski. "Molecular syringe for cargo photorelease ‐ red‐light‐triggered supramolecular hydrogel." Chemistry – A European Journal, August 22, 2023. http://dx.doi.org/10.1002/chem.202302295.

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Photochromic supramolecular hydrogels are versatile materials that elicit macroscopic effects upon irradiation, like liquefaction or shape changes. Here we demonstrate a simple photochromic cyclic dipeptide (2,5‐diketopiperazine‐based) supergelator composed of (S)‐lysine and an azobenzene analogue of phenylalanine, which forms supramolecular hydrogels already at 0.1 wt% loading. The gels can physically encapsulate cargo molecules and release them to the environment in a controllable manner upon irradiation with red light, working as a “molecular syringe”. As the material is biocompatible and operational in the “therapeutic window” of light (>650 nm) that deeply penetrates soft human tissues, it is applicable for smart drug delivery systems.

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23

Boilot, J.-P., J. Biteau, A. Brun, F. Chaput, T. Dantas De Morais, B. Darracq, T. Gacoin, et al. "Hybrid Gels and Nanoscale Chemistry for Optical Applications." MRS Proceedings 519 (1998). http://dx.doi.org/10.1557/proc-519-227.

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AbstractA large variety of materials for optical and optoelectronic applications has been developed by trapping active organic molecules and nanocrystals into pure inorganic and hybrid organic- inorganic gels. Concerning optically active molecules, we focus only here on luminescent materials for solid state tunable lasers and light-emitting diodes, and photochromic materials for integrated optics and optical storage. Optical properties can be controlled by changing the nature and the intensity of chemical and steric interactions between the organic system and the solid host matrix. Concerning nanocrystals, we present two approaches for the synthesis of transparent solids based on 1I-VI semiconducting nanoparticles. A first category of materials consists in the dispersion of CdS nanoparticles in sol-gel silica matrices. The luminescence can be controlled by offering an alternative pathway for the recombination of surface trapped carriers. A second group of transparent materials is obtained by considering the CdS nanoparticles not only as the optically active units, but also as the building blocks for the whole solid.

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24

Dong, Yu, Yao Ling, Donghui Wang, Yang Liu, Xiaowei Chen, Shiya Zheng, Xiaosong Wu, et al. "Harnessing molecular isomerization in polymer gels for sequential logic encryption and anticounterfeiting." Science Advances 8, no. 44 (November 4, 2022). http://dx.doi.org/10.1126/sciadv.add1980.

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Using smart photochromic and luminescent tissues in camouflage/cloaking of natural creatures has inspired efforts to develop synthetic stimuli-responsive materials for data encryption and anticounterfeiting. Although many optical data-encryption materials have been reported, they generally require only one or a simple combination of few stimuli for decryptions and rarely offer output corruptibility that prevents trial-and-error attacks. Here, we report a series of multiresponsive donor-acceptor Stenhouse adducts (DASAs) with unprecedented switching behavior and controlled reversibility via diamine conformational locking and substrate free-volume engineering and their capability of sequential logic encryption (SLE). Being analogous to the digital circuits, the output of DASA gel–based data-encryption system depends not only on the present input stimulus but also on the sequence of past inputs. Incorrect inputs/sequences generate substantial fake information and lead attackers to the point of no return. This work offers new design concepts for advanced data-encryption materials that operate via SLE, paving the path toward advanced encryptions beyond digital circuit approaches.

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25

PRESTON, D., J. C. POUXVIEL, T. NOVINSON, W. C. KASKA, B. DUNN, and J. I. ZINK. "ChemInform Abstract: Photochromism of Spiropyrans in Aluminosilicate Gels." ChemInform 21, no. 37 (September 11, 1990). http://dx.doi.org/10.1002/chin.199037109.

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26

Seo, Goichiro, Yuki Saito, Miyu Nakamichi, Kyohei Nakano, Keisuke Tajima, and Kaname Kanai. "Mechanism of charge accumulation of poly(heptazine imide) gel." Scientific Reports 11, no. 1 (September 8, 2021). http://dx.doi.org/10.1038/s41598-021-97025-9.

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AbstractPhoto-stimuli response in materials is a fascinating feature with many potential applications. A photoresponsive gel of poly(heptazine imide), PHI, termed PHIG, exhibits photochromism, photoconductivity, and photo-induced charge accumulation, and is generated using ionic liquids and PHI. Although there are several examples of ionic liquid gels that exhibit photochromism and photoconductivity, this is the first report of an ionic liquid gel that exhibits both these properties as well as charge accumulation. We conducted experimental and theoretical investigations to understand the mechanism of the photostimulus response of PHIG, especially charge accumulation. The proposed model explains both the mechanism of charge accumulation and dark photocatalysis by PHI and provides new concepts in the field of photofunctional materials.

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