Reversible Photochromic Nanofiber Membrane Containing Comb‐Like Poly(octadecyl acrylate) Nanoparticles Used for Ultraviolet Intensity Indicator

Zhang, Zhuang; Wang, Yu; Wang, Jianping; Wang, Ning; Han, Na; Zhang, Xingxiang; Li, Wei

doi:10.1002/mame.201900299

Cited by 11 publications

(3 citation statements)

References 36 publications

(45 reference statements)

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“…The thermal color fading effect was accelerated by the rising OPD concentration. 30 Therefore, a balanced state was reached when the OPD concentration rose to a critical value, 9 satisfying the need for photochromicity at an OPD concentration of 15 wt %.…”

Section: Resultsmentioning

confidence: 90%

“…8 In contrast, organic photochromic materials possess distinct features such as high photosensitivity and exceptional fatigue resistance, making them ideal for preparing sensitive photochromic fibrous materials. Zhang et al 9 prepared the PVA/polyethylenimine membrane with organic photochromic nanoparticles. The membrane could completely change color within 20 s under ultraviolet (UV) radiation.…”

Section: Introductionmentioning

confidence: 99%

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Poly(3-hydroxybutyrate)/Poly(lactic acid) Composite Nanofibrous Membrane with Outstanding Photochromic and Antibacterial Performances for Multifunctional Applications

Zhu,

Fu,

et al. 2024

ACS Appl. Polym. Mater.

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Photochromic and antibacterial fibrous materials are of interest due to the growing demand for fashion and the potential threat of bacterial infections in daily life. The preference for multifunctional biobased fibrous materials has also grown, driven by severe environmental pollution problems and the need to meet individual public needs. In this study, the effect of the preparation method and the ratio of poly(3-hydroxybutyrate) (PHB) to poly(lactic acid) (PLA) on solution spinnability was first analyzed. Subsequently, organic photochromic dye (OPD) and silver nanowires (AgNWs) were added to the PHB/PLA mixed solution. An exceptional photochromic and antibacterial PHB/ PLA composite nanofibrous membrane (OA-PHB/PLA NFM) was created via electrospinning. The results indicated that the OA-PHB/PLA NFM produced under the optimal electrospinning parameters exhibited an average diameter of 240 nm with concentrated diameter distribution. The OA-PHB/PLA NFM also demonstrated good mechanical properties, including a breaking stress of 1.61 MPa and a breaking strain of 42.53%, as well as excellent photochromic and antibacterial properties (>98%). The 143 μm thick OA-PHB/PLA NFM@PLA composite exhibited notable advancements in ultraviolet (UV) protection and filtration efficiency (99.9%) with a minimal pressure drop (73.4 Pa), ensuring its suitability for sun-protective and photochromic masks. Furthermore, the OA-PHB/PLA NFM also demonstrated great potential in the field of anticounterfeiting. Overall, this study presents an approach to develop a biobased PHB/PLA NFM with excellent photochromic and antibacterial characteristics, showcasing great potential for applications in smart clothing, healthcare, anticounterfeiting, etc.

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Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Poly(3-hydroxybutyrate)/Poly(lactic acid) Composite Nanofibrous Membrane with Outstanding Photochromic and Antibacterial Performances for Multifunctional Applications

Zhu,

Fu,

et al. 2024

ACS Appl. Polym. Mater.

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“…Electrospinning is a promising and convenient approach for designing and construction of three-dimensional photoresponsive nanofibrous scaffolds from a variety of natural and synthetic polymers with diameters in the range of nano- to micrometers. ,− The photoresponsive electrospun nanofibers have many advantages to the corresponding films because of their larger surface area and higher porosity, which leads to an increase in response rate and a decrease in recovery time . Genovese et al.…”

Section: Introductionmentioning

confidence: 99%

Progressive Readout Platform Based on Photoswitchable Polyacrylic Nanofibers Containing Spiropyran in Photopatterning with Instant Responsivity to Acid–Base Vapors

et al. 2020

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Covalent bonding of photochromic molecules to a polymer matrix, flexibility of the polymeric host, and also its nanofibrous state are appropriate conditions to enhance the switching rate, photofatigue resistance, sensitivity, and long-term performance of these photo-active groups. Herein, photoresponsive polymethyl methacrylate and poly(methyl methacrylate-cobutyl acrylate) chemically modified with spiropyran (MSP and MBSP, respectively) were prepared through emulsion polymerization. To improve photosensitivity and reduce response time, the corresponding nanofibers (MSP@NF and MBSP@NF) were prepared by an electrospinning technique. Smooth and beadless morphology, high porosity (above 85%), and uniform diameter size distribution of MSP@NF (169 ± 39 nm) and MBSP@NF (203 ± 47 nm) were identified. Time-dependent UV−vis spectra and photo-isomerization kinetics revealed that flexible MBSP@NF has remarkable enhancement in the SP to merocyanine isomerization rate (19 folds) relative to the corresponding film. Reversible responsivity to HCl and ammonia vapors showed a dramatic color change and maximum absorption peak displacement for nanofiber samples immediately, together with fluorescence switching "on" and "off", while this took about 10 min for the MBSP@F sample. This was attributed to the high surface area and porous structure of these nanofibers, providing enhanced diffusion and interaction with the photo-active groups. Reversible optical write−erase cycles with improved response time and color intensity approved photopatterning capability of MBSP@NF. Enhanced photochemical, photostability, and photofatigue resistance of MBSP@NF within 10 cycles of alternating exposure to HCl−ammonia vapors and also UV−vis irradiations revealed the potentiality of such nanofibers in visual reversible photopatterning and optochemical acidochromic and ammonia-chromic portable probes.

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Enhancement of Solid‐State Reversible Photochromism by Incorporation of Rigid Steric Hindrance Groups

Yang

et al. 2020

Advanced Optical Materials

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which have attracted considerable research attention. Spiropyran can change from its closed form to the merocyanine (MC) structure under ultraviolet (UV) light, and recover its original form by visible light or heat treatment. [7] Other external stimuli, such as acids or bases, [8] metal ions, and redox potentials [7a,c] can also achieve this reversible isomerization. Unfortunately, most of these stimulus-induced conversions can only occur in solution or soft materials and are hampered in the solid state. As a result, one of the main tasks in the development of solid-state photoresponsive materials for practical applications is achieving an effective stimulus-induced conversion in the solid state. The reason for the limited cis−trans isomerization in the solid state is the lack of intrinsic structural flexibility, which is required to release stress and strain during the stimulus-induced transformation. The main problem lies in the photo-switching of SP compounds, because of their strong molecular packing in the aggregated state. Such close molecular packing mainly hinders the cis−trans isomerization, which occurs during photochemical reactions between the SP and MC isomers. Hence, an effective way to solve the current challenges in solid-state photoswitching is to create large free volumes during the isomerization. There are two common methods to achieve this goal. One involves the copolymerization of spiropyran with polymer monomers. [9] For example, Li et al. fabricated a reversible photochromic nanofiber membrane by copolymerizing spiropyran with octadecyl acrylate and blending it with polyvinyl alcohol (PVA)/polyethylenimine (PEI). [9a] However, polymerization is relatively complex and involves rather harsh reaction conditions. Another approach involves the modification of spiropyran with large steric organic molecules. In a previous study, the main goal was to introduce long flexible chains in spiropyran, to increase the free volume. [10] However, long chains always led to a decrease in the thermal stability, and the photochromic properties did not show an obvious enhancement. Currently, researchers are mainly focusing on introducing rigid steric hindrance groups to improve the photochromic properties and the thermal stability. [11] The Xu and Yin's groups reported that the solid-state photochromism of spiropyran was improved by introducing aggregation-induced emission (AIE) molecules, owing to their highly twisted structures, which induced loose packing and provided a larger free volume in the aggregated state. [12] In addition, the Yin group reported that the introduction of naphthalimide provided sufficient free Solid-state materials with reversible properties are highly attractive, owing to versatile applications in security, sensors, bioimaging, and information storage. Unfortunately, obtaining these materials in the solid state remains a huge challenge. Efficient isomerization usually requires sufficient conformational freedom and cannot be achieved without solvents or matrices. In this study, four st...

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Reversible Photochromic Nanofiber Membrane Containing Comb‐Like Poly(octadecyl acrylate) Nanoparticles Used for Ultraviolet Intensity Indicator

Cited by 11 publications

References 36 publications

Poly(3-hydroxybutyrate)/Poly(lactic acid) Composite Nanofibrous Membrane with Outstanding Photochromic and Antibacterial Performances for Multifunctional Applications

Poly(3-hydroxybutyrate)/Poly(lactic acid) Composite Nanofibrous Membrane with Outstanding Photochromic and Antibacterial Performances for Multifunctional Applications

Progressive Readout Platform Based on Photoswitchable Polyacrylic Nanofibers Containing Spiropyran in Photopatterning with Instant Responsivity to Acid–Base Vapors

Enhancement of Solid‐State Reversible Photochromism by Incorporation of Rigid Steric Hindrance Groups

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