Multiple switching photochromic poly(N-isopropylacrylamide) with spironaphthoxazine hydrogel

Wang, Sheng; Choi, Myung-Shik; Kim, Sung-Hoon

doi:10.1016/j.dyepig.2007.10.001

Cited by 25 publications

(14 citation statements)

References 30 publications

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“…This endothermic phase transition is accompanied by a release of water bound to the polymer chain. In previous papers [9,10], the present research groups has reported bistable photoswitching in poly(N-isopropylacrylamide) with photochromic spironaphthoxazine hydrogel for optical data storage applications. D-p-Apyran-based, fluorescent dyes such as 4-(dicyanomethylene)-2-methyl-6-(4-(dimethylamino)styryl)-4H-pyran (DCM) have been developed as both photo-and electro-luminescent materials for applications in dye lasers [11], sensors [12] and dye-sensitized solar cells [13].…”

Section: Introductionmentioning

confidence: 97%

Photoregulated optical switching of poly(N-isopropylacrylamide) hydrogel in aqueous solution with covalently attached spironaphthoxazine and D-π-A type pyran-based fluorescent dye

et al. 2010

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Section: Introductionmentioning

confidence: 97%

Photoregulated optical switching of poly(N-isopropylacrylamide) hydrogel in aqueous solution with covalently attached spironaphthoxazine and D-π-A type pyran-based fluorescent dye

et al. 2010

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“…It reported the photochromism of cationic spiroxazine/PSS multilayer films with showing cationic spiroxazine/PSS multilayer films have absorbance spectrum near 600 nm after UV irradiation [5]. Recently, a synthesis of a multiple switching photochromic poly(N-isopropylacrylamide) with spironaphthoxazine hydrogel (PNIPA-SPO), which undergoes thermally controlled, reversible switching from solution phase to gel phase at the lower critical solution temperature was reported [6]. Microspheres containing dyes, such as polylactic acid (PLA) microspheres containing soluble dyes as water-soluble model compounds were prepared using the water-in-oil-in-water (w/o/w) emulsion solvent evaporation method [7].…”

Section: Introductionmentioning

confidence: 98%

Preparation and photochromism of poly(methyl methacrylate) microspheres containing spirooxazine

et al. 2008

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Photochromic poly(methyl methacrylate) (PMMA)/spirooxazine microspheres were prepared by in situ suspension polymerization and those photochromic behaviors were investigated. When UV irradiation was subjected to the PMMA/ spirooxazine microspheres, the reflection spectra generated by photochromic reaction was clearly observed and its reversible decoloration behaviors responded rapidly in the dark. Photochromic microspheres prepared in this work, could be used to photochromic fabrics such as microcapsules for fragrant finishing of fabrics, as well as those are could be applied in sensing materials.

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“…]oxazine]) had excellent photochromic properties and defined thermo-reversible properties in a hydrogel system at LCST [89]. This system constituted a multi-mode complete reversible switch by light, thermal stimuli, base and proton.…”

Section: Gels Organogelsmentioning

confidence: 99%

“…Furthermore, the small size (<1 m) of nanoparticles may also allow their use in inkjet inks, which are particularly sensitive to particle size due to small nozzle orifice. Poly(N-isopropylacrylamide) gels containing a SO as a multi-mode reversible switch by light, thermal stimuli, as well as base and proton, possesses promising applications in the fields of opto-and electronic smart materials, logic gate, nanomachines, fluorescence sensors and other molecular photonic devices [89]. The practical capability of rewritable high-density fluorescence photoimaging on the PVA film loaded with SO containing nanoparticles was investigated by patterned illumination through photomasks [70].…”

Section: Applicationsmentioning

confidence: 99%

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Organic Nanoparticulate Photochromes

Feczkó¹,

Vončina²

2013

COC

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Photochromic organic dyes can be widely used in materials for optically rewritable data storage, photonic switches, memories, sensors, or actuators. In recent years photochromic materials based on nanoparticles became particularly focused, since they can be dispersed in colloidal aqueous suspensions or incorporated in thin films, avoiding problems of light scattering or shallow light penetration in bulk materials. Spiropyrans, spirooxazines and diarylethenes were by far the most researched photochromes in nanoparticulate systems. Great effort was made to investigate photochromic dyes incorporated into organic nanoparticles via self-assembly strategies, covalent linkage or dispersion of the molecular species in polymers (doping). Nanoparticles composed of solely photochromic dyes were prepared by laser ablation and reprecipitation techniques. Photochromic dyes were microencapsulated by self-assembly, soap free-, emulsion/microemulsion/miniemulsion or free radical-(co)polymerization. Sol-gel processing from silane precursors to poly(organo)siloxane matrix is a common method to synthesize doped or core-shell photochromic organogels. Coloured forms of some photochromes display fluorescence; however, a more effective strategy for fluorescence modulation with photochromic molecules is integrating them, covalently or noncovalently, with a separate fluorophore in the same nanoparticles. These photoresponsive nanoparticles may find applications particularly in biological fields such as cell labelling and bioimaging. The purpose of this review is to summarize the preparation methods of organic nanoparticles containing photochromic dyes and to investigate their typical properties derived from their nanoparticulate character.Keywords: photochromic nanoparticle, laser ablation, reprecipitation, polymerization, doping, fluorescence INTRODUCTIONPhotochromism is a reversible structural and colour change of a species triggered in one or both directions by electromagnetic radiation [1]. The shift of optical absorption, due to change in molecular structure or conformation results in colourization, while the coloured product decolourizes after a structure rearrangement in the back (generally thermal) reaction. The reversible transformations of photochromic compounds are usually based on ring opening/closing steps, cis/trans isomerizations, proton transfer, electron transfer or cycloadditions [2]. Like other stimuli responsive materials (e.g. heat and pH-sensitive materials), photochromic devices are responsive to an external stimulus, in this case, light. Light is the most attractive stimulus due to the fact that its wavelength, intensity and focus can be tuned. Photochromic materials have been investigated extensively during the past few decades because of optical responses and nonlinear optical, electronic and magnetic properties [3]. Photochromic materials have a high potential for applications to ophthalmic lenses [4,5] [15], and also for microstructuring and patterning surfaces [16]. Therefore, photosensitive, nanoscal...

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Multiple switching photochromic poly(N-isopropylacrylamide) with spironaphthoxazine hydrogel

Cited by 25 publications

References 30 publications

Photoregulated optical switching of poly(N-isopropylacrylamide) hydrogel in aqueous solution with covalently attached spironaphthoxazine and D-π-A type pyran-based fluorescent dye

Photoregulated optical switching of poly(N-isopropylacrylamide) hydrogel in aqueous solution with covalently attached spironaphthoxazine and D-π-A type pyran-based fluorescent dye

Preparation and photochromism of poly(methyl methacrylate) microspheres containing spirooxazine

Organic Nanoparticulate Photochromes

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