Rewritable Spiropyran/Polyacrylonitrile Hybrid Nanofiber Membrane Prepared by Electrospinning

NANO ◽  
2020 ◽  
Vol 15 (01) ◽  
pp. 2050013 ◽  
Author(s):  
Bingwei Bao ◽  
Ji Fan ◽  
Rui Xu ◽  
Wei Wang ◽  
Dan Yu
Keyword(s):  
Color Change ◽  
Uv Light ◽  
Dimethyl Fumarate ◽  
Gravimetric Analysis ◽  
Nanofiber Membrane ◽  
Good Thermal Stability ◽  
Fast Switching ◽  
Hybrid Nanofiber ◽  
Nanofiber Film ◽  
Photochromic Materials

Photochromic materials aroused enormous interest due to their potential application for rewritable paper, smart labeling and sensor devices. In this paper, we proposed to dissolve spiropyran (SP, photochromic material) and polyacrylonitrile (PAN, polymer matrix) in dimethyl fumarate (DMF) to prepare photochromic nanofibers by electrospinning. The target SP compounds were featured by FTIR, ultraviolet (UV) and 1HNMR, and the nanofibers were characterized by FTIR, UV-vis spectra, scanning electron microscope (SEM), thermal gravimetric analysis (TGA) and contact angle (CA). The test results demonstrated that photochromic SP was synthesized successfully, and the nanofiber membrane possesses extraordinary color-converting properties including obvious color change from white to purple, reversible fast switching between two colors when exposed to UV light and achieve maximum color change in 1[Formula: see text]min, and switchable hydrophilic and hydrophobic properties as well as excellent photo-fatigue resistance over 20 cycles. In addition, it has good thermal stability allowing it to be used under harsh conditions. In view of the above characteristics, we believe that the as-prepared nanofiber film will be a promising reusable writing substrate.

scholarly journals Deposition of Zinc Oxide Coatings on Wood Surfaces Using the Solution Precursor Plasma Spraying Process

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 183
Author(s):  
Ghiath Jnido ◽  
Gisela Ohms ◽  
Wolfgang Viöl
Keyword(s):  
Zinc Oxide ◽  
Ftir Spectroscopy ◽  
Photoelectron Spectroscopy ◽  
Color Change ◽  
Uv Light ◽  
Beech Wood ◽  
Nitrate Solution ◽  
Ftir Spectra ◽  
Solution Precursor ◽  
Wood Surfaces

In the present work, the solution precursor plasma spray (SPPS) process was used to deposit zinc oxide (ZnO) coatings on wood surfaces using zinc nitrate solution as precursor to improve the hydrophobicity and the color stability of European beech wood under exposure to ultraviolet (UV) light. The surface morphology and topography of the wood samples and the coatings were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The formation of ZnO was detected with the help of X-ray photoelectron spectroscopy (XPS) and by Fourier transform infrared (FTIR) spectroscopy. The FTIR spectra of the coated samples showed the typical Zn–O band at 445 cm−1. According to the XPS analysis, the coatings consist of two different Zn-containing species: ZnO and Zn(OH)2. Variation of the deposition parameters showed that the most significant parameters affecting the microstructure of the coating were the solution concentration, the deposition scan speed, and carrier gas flow rate. The wettability behaviors of the coated wood were evaluated by measuring the water contact angle (WCA). The coatings that completely covered the wood substrates showed hydrophobic behaviors. UV-protection of wood surfaces after an artificial UV light irradiation was evaluated by color measurements and FTIR spectroscopy. The ZnO-coated wood surfaces were more resistant to color change during UV radiation exposure. The total color change decreased up to 60%. Additionally, the FTIR spectra showed that the wood surfaces coated with ZnO had more stability. The carbonyl groups formation and C=C-bonds consumption were significantly lower.

Decellularized liver-regenerative 3D printing biomaterials for cell-based liver therapies via a designed procedure combined with papain-containing reagent treatments and supercritical fluids

2021 ◽  
pp. 1-8
Author(s):  
Ching-Cheng Huang
Keyword(s):  
3D Printing ◽  
Thermo Gravimetric Analysis ◽  
Extraction Process ◽  
Gravimetric Analysis ◽  
Collagen Scaffolds ◽  
Scanning Calorimetry ◽  
Porcine Liver ◽  
Good Thermal Stability ◽  
Decellularized Liver ◽  
Liver Collagen

BACKGROUND: The biologic scaffolds derived from decellularized tissues and organs have been successfully developed in a variety of preclinical and/or clinical studies. OBJECTIVE: The new decellularized liver-regenerative 3D printing biomaterials were designed and prepared for cell-based liver therapies. METHODS: An extraction process was employed to remove the tissue and cellular molecules from porcine liver via pretreatment of supercritical fluid of carbon dioxide (ScCO2). Varying porosities of the decellularized liver tissues were created using papain-containing reagent treatments after ScCO2. RESULTS: The resulting liver-regenerative 3D printing biomaterials of decellularized liver collagen scaffolds were characterized by Fourier transform infrared spectroscopy, thermo-gravimetric analysis, differential scanning calorimetry and scanning electron microscopy. CONCLUSIONS: The decellularized liver collagen scaffolds with good thermal stability (>150 °C) were obtained and employed as liver-regenerative 3D printing biomaterials for cell-based liver therapies.

Damage indication of 2′, 7′-dichlorofluorescein for epoxy polymer and the effect of water on its damage indicating ability

e-Polymers ◽  
2017 ◽  
Vol 17 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Yakun Guo ◽  
Pengxiang Zhao ◽  
Xiaofang Wang ◽  
Duigong Xu ◽  
Jingrong Zhong ◽  
...  
Keyword(s):  
Epoxy Polymer ◽  
Color Change ◽  
Molecular Form ◽  
Early Stage ◽  
Mechanical Damage ◽  
Gravimetric Analysis ◽  
Structure Transition ◽  
Effect Of Water ◽  
Damage Indicator ◽  
Epoxy Amine

AbstractEpoxy polymer with damage indicating ability was very usable for ships and bridges to detect the cracks at an early stage and to prevent corrosion. 2′, 7′-dichlorofluorescein (DCF), as a damage indicator, was used to report the mechanical damage of epoxy-amine polymer by a strong color change from a light yellow to bright red due to the molecular structure transition from the acid molecular form to the base ion form. The effect of water on damage indicator and damaged epoxy-amine polymer film was evaluated by an immersion test and the properties were characterized by ultraviolet-visible spectrophotometry (UV-Vis), scanning electronic microscopy (SEM), energy dispersive X-ray spectrometer (EDS), zeta potential and thermal gravimetric analysis (TGA). The results showed that DCF was an easy, stable and permanent indicator for epoxy-amine polymer and the water only had a slight influence on the indication stability of damaged epoxy polymer.

Synthesis, Photochromism and Optical Recording Properties of a Diarylethene Materials Bearing an Isoxazole Unit

2012 ◽  
Vol 583 ◽  
pp. 125-129 ◽  
Author(s):  
Xiao Ting Li ◽  
Hui Li ◽  
Gang Liu
Keyword(s):  
Thermal Stability ◽  
Uv Light ◽  
Amorphous Film ◽  
Optical Storage ◽  
Optical Recording ◽  
Strong Fluorescence ◽  
Good Thermal Stability ◽  
Closed Ring ◽  
Open Ring ◽  
Hexane Solution

A new unsymmetrical photochromic diarylethene, 1-(3,5-dimethyl-4-isoxazolyl)-2-[2-methyl-5-(4-formylphenyl)-3- thienyl]perfluorocyclopentene(1a) were synthesized, and its properties, such as photochromism and fluorescence properties, were investigated in detail. The results showed that this compound had good thermal stability and exhibited reversible photochromism, changing from colorless to darkred after irradiation with UV light both in solution and in PMMA amorphous film, the maxima absorption of its closed-ring isomer 1b are 529 nm and 541 nm respectively. The open-ring isomer of the diarylethene 1a exhibited relatively strong fluorescence at 492 nm in hexane solution (2 × 10-5 mol/L) when excited at 418 nm. The fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light. This new photochromic system also exhibited remarkable optical storage character.

Research on Photochromic Compounds with Synthesis and Properties of a Novel Unsymmetrical Diarylethene with a Benzothiophene and a Pyrrole Group

2014 ◽  
Vol 1003 ◽  
pp. 23-26
Author(s):  
Hong Jing Jia ◽  
Ying Long Fu ◽  
Cong Bin Fan
Keyword(s):  
Thermal Stability ◽  
Potential Application ◽  
Uv Light ◽  
Optical Storage ◽  
Pmma Film ◽  
Good Thermal Stability ◽  
Photochromic Compounds ◽  
Storage Technology ◽  
Hexane Solution

A new unsymmetrical photochromic diarylethene1o, which is named [1-(2-methyl-benzothiophene)-2-(2-cyano-1,5-dimethyl-4-pyrryl)]perfluorocyclopentene, was synthesized. We used it to accomplish recording by optical storage technology as memory medium. Then its photochromic both in hexane solution and in PMMA film and kinetics experiment were investigated in detail. The result indicated that this diarylethene had good thermal stability and exhibited reversible photochromism, changing the color from colorless to violet in hexane solution upon appropriate irradiation with 297 nm UV light, respectively. What is more, the kinetic experiments illustrated that the cyclization/cycloreversion process of this compound was determined to be the zeroth/first reaction. The results demonstrated that the unsymmetrical diarylethene compound1o, which we have synthesized, had attractive properties for potential application in optical storage.

Preparation, Characterization and UV Absorption of Phosphotungstic Acid Cerium

2014 ◽  
Vol 1061-1062 ◽  
pp. 328-332
Author(s):  
Hai Lian Yu ◽  
Zhen Hu
Keyword(s):  
Phosphotungstic Acid ◽  
Absorption Capacity ◽  
Uv Absorption ◽  
Precipitation Method ◽  
Gravimetric Analysis ◽  
X Ray ◽  
Good Thermal Stability ◽  
Infrared Spectrometer ◽  
The Fourier Transform ◽  
Fluorescence Spectrometer

Phosphotungstic acid cerium [CePW12O40] was prepared with phosphotungstic acid and hydrate cerium nitrate by precipitation method. The Fourier transform infrared spectrometer, X-ray diffractometer, X-ray fluorescence spectrometer and thermal gravimetric analysis were used to characterize product, The UV-VIS spectrophotometer was used to measure its absorption capacity. The results showed that the prepared product is CePW12O40, it has good crystal and good thermal stability, its purity reaches 99.55%, there is good UV absorption property between 200nm and 260nm..

Study on Photochromic Materials with a Novel Photochromic Diarylethene use for Polarization Holographic Recording

2013 ◽  
Vol 763 ◽  
pp. 61-64 ◽  
Author(s):  
Shang Hua He ◽  
Gang Liu ◽  
Shi Qiang Cui
Keyword(s):  
Fluorescence Spectra ◽  
Uv Light ◽  
Amorphous Film ◽  
Quantum Yields ◽  
Holographic Recording ◽  
Pmma Film ◽  
Recording Medium ◽  
Fluorescent Properties ◽  
Image Recording ◽  
Photochromic Materials

A novel unsymmetrical photochromic diarylethene 1-(2, 5-dimethyl-3-thienyl)-2-[2-methyl-5-(2,2-dibutylfluorene)-3-thienyperfluorocyclo-pentene (1o) was synthesized and its photochromic and fluorescent properties were investigated. Diarylethene 1 changed the color from colorless to hyacinthine upon irradiation with 297 nm UV light, in which absorption maxima were observed at 554 nm in hexane and at 565 nm in PMMA amorphous film, respectively. This new photochromic system also exhibited remarkable fluorescence intensity both in solution and in PMMA film. The fluorescence spectra showed a systematic red-shift with the emission intensity of diarylethene 1 in a photo-stationary state was quenched to ca. 64%. The cyclization and cycloreversion quantum yields of 1 in hexane were determined to be 0.56 and 0.002. Polarization multiplexed image recording can be carried out in this diarylethene 1c/PMMA film as recording medium film.

New Epoxy Poly(dimethyl acrylamide) Polymer for the Dispersion of ZnO Nanoparticles

2020 ◽  
Vol 12 (10) ◽  
pp. 1231-1235
Author(s):  
V. Sorna Gowri ◽  
Raj Kumar Sen ◽  
Sunil Kumar Sanghi ◽  
Avanish Kumar Srivastava
Keyword(s):  
Zinc Oxide ◽  
Polymer Matrix ◽  
Zinc Oxide Nanoparticles ◽  
Thermo Gravimetric Analysis ◽  
Oxide Particle ◽  
Zinc Nitrate ◽  
Oxide Nanoparticles ◽  
Gravimetric Analysis ◽  
Good Thermal Stability ◽  
Copolymer Composites

A series of novel Zinc Oxide (ZnO) copolymer composites films with different Zinc Oxide concentration were prepared through incorporation of pre-made Zinc Oxide particle in to copolymer epoxy poly(dimethyl acrylamide). The copolymer epoxy poly(dimethyl acrylamide) was synthesized by free radical polymerization to disperse the Zinc Oxide nanoparticles. The Zinc Oxide nanoparticles with the diameter of 19 nm–35 nm were synthesized from zinc nitrate via a wet chemical method. The aim of the work is to develop a new method/process/material for the dispersion of Zinc Oxide nanoparticles and testing the performance of these composites films. Thermo gravimetric analysis show that Zinc Oxide nanoparticles were successfully incorporated into the polymer matrix and the Zinc Oxide copolymer composites have a good thermal stability. The micro structural analysis also show newly synthesized polymer disperse the nanoparticles well as evidenced by Scanning Electron Microscopy (SEM) analysis. The uniformly dispersed Zinc Oxide nanoparticle in the polymer matrix and the particles almost remained in their original shape and size even after incorporation in the polymer matrix. Fourier transform infrared spectroscopy (FT-IR) shift of the copolymer adsorbed Zinc Oxide nanoparticles confirmed that polymer molecules chain was anchored on the surface of the nanoparticles.

scholarly journals High-intensity focused ultrasound-induced mechanochemical transduction in synthetic elastomers

2019 ◽  
Vol 116 (21) ◽  
pp. 10214-10222 ◽  
Author(s):  
Gun Kim ◽  
Vivian M. Lau ◽  
Abigail J. Halmes ◽  
Michael L. Oelze ◽  
Jeffrey S. Moore ◽  
...  
Keyword(s):  
High Intensity ◽  
Cellular Response ◽  
Focused Ultrasound ◽  
Focal Spot ◽  
Color Change ◽  
Uv Light ◽  
High Intensity Focused Ultrasound ◽  
Photon Flux ◽  
Mechanical Stimuli ◽  
Mechanochemical Transduction

While study in the field of polymer mechanochemistry has yielded mechanophores that perform various chemical reactions in response to mechanical stimuli, there is not yet a triggering method compatible with biological systems. Applications such as using mechanoluminescence to generate localized photon flux in vivo for optogenetics would greatly benefit from such an approach. Here we introduce a method of triggering mechanophores by using high-intensity focused ultrasound (HIFU) as a remote energy source to drive the spatially and temporally resolved mechanical-to-chemical transduction of mechanoresponsive polymers. A HIFU setup capable of controlling the excitation pressure, spatial location, and duration of exposure is employed to activate mechanochemical reactions in a cross-linked elastomeric polymer in a noninvasive fashion. One reaction is the chromogenic isomerization of a naphthopyran mechanophore embedded in a polydimethylsiloxane (PDMS) network. Under HIFU irradiation evidence of the mechanochemical transduction is the observation of a reversible color change as expected for the isomerization. The elastomer exhibits this distinguishable color change at the focal spot, depending on ultrasonic exposure conditions. A second reaction is the demonstration that HIFU irradiation successfully triggers a luminescent dioxetane, resulting in localized generation of visible blue light at the focal spot. In contrast to conventional stimuli such as UV light, heat, and uniaxial compression/tension testing, HIFU irradiation provides spatiotemporal control of the mechanochemical activation through targeted but noninvasive ultrasonic energy deposition. Targeted, remote light generation is potentially useful in biomedical applications such as optogenetics where a light source is used to trigger a cellular response.

scholarly journals Development and Characterization of a Biodegradable Colored Film Based on Starch and Chitosan by Using Acacia Catechu

2016 ◽  
Vol 8 (2) ◽  
pp. 123-130
Author(s):  
FB Quader ◽  
RA Khan ◽  
MA Islam ◽  
S Saha ◽  
KN Sharmin
Keyword(s):  
Tensile Strength ◽  
Composite Film ◽  
Thermo Gravimetric Analysis ◽  
Chitosan Film ◽  
Green Technology ◽  
Gravimetric Analysis ◽  
Good Thermal Stability ◽  
Biodegradable Composite ◽  
Acacia Catechu

Green technology like biodegradable films using natural polymer is an obvious need of today. Attempt of this experiment was aimed at development and characterization of a biodegradable colored film based on starch and chitosan by using Acacia catechu. Chitosan reinforced starch based biodegradable composite film was prepared by casting. The chitosan content in the films was varied from 20-80 % (w/w). Tensile strength (TS) was improved significantly with the addition of chitosan but the elongation at break (EB %) of the composite decreased. With the addition of the Acacia catechu, tensile strength of the composites improved more. The acacia content of the film was varied from 0.05-0.2(w/w). The good thermal stability of this prepared film was confirmed by thermo-gravimetric analysis. Structural characterization was done by Fourier transform infrared radiation spectroscopy. Surface morphology of the composite film was examined by scanning electron microscope (SEM) which suggested sufficient homogenization of starch, chitosan and Acacia catechu. Water uptake was found lower for final composites in the comparison to starch/chitosan and chitosan film. The satisfactory rate of degradation in the soil is expected that the final composite film within less than 6 months. The developed films intended to use as the alternative of synthetic non biodegradable colored packaging films.J. Environ. Sci. & Natural Resources, 8(2): 123-130 2015

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