Synthesis and Electrochromic Properties of Fluorescent PEDOT/PSS Composite

2014 ◽  
Vol 665 ◽  
pp. 300-306
Author(s):  
Xin Li ◽  
Cong Ju Li
Keyword(s):  
Color Change ◽  
Chemical Oxidation ◽  
Poly Vinyl Alcohol ◽  
Electrochromic Property ◽  
Film Forming ◽  
Chemical Oxidation Polymerization ◽  
Dye Doping ◽  
Poly Styrene Sulfonate ◽  
Dark Blue ◽  
Pure Pedot

A novel kind of poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate) (PEDOT/PSS) composite was synthesized through chemical oxidation polymerization in the presence of fluorescent yellow GG (FYGG) as the functional co-dopant and Poly(vinyl alcohol) as the film-forming additives. The as-prepared composite was found combined with fluorescent function and electrochromic property. Film of the PEDOT/PSS-FYGG composites switches from green in the reduction state to blue-green in the oxidized state, which is different from the pure PEDOT/PSS of light blue (-0.2V) and dark blue (0.8V). Because of the big molecule of FYGG as the dopant, the response time reaching 90% of the full optical contrast of PEDOT/PSS-FYGG was 1.77s for the coloration process and 1.78s for the reverse bleach process, which is a little slower than the pure PEDOT/PSS. Additionally, PEDOT/PSS-FYGG film presents a good stability. It is shown that acid dye doping is an effective method to broaden the color change range of the electrochromic mateials.

The Electropolymerization and Characterizations of Fluorescent Dye Doped Poly(3,4-ethylenedioxythiophene)

2014 ◽  
Vol 552 ◽  
pp. 291-297
Author(s):  
Xin Li ◽  
Fei Yue Liang ◽  
Cong Ju Li
Keyword(s):  
Response Time ◽  
Oxidation Process ◽  
Color Change ◽  
Reduction Process ◽  
Colorimetric Analysis ◽  
Optical Contrast ◽  
Color Changes ◽  
Dye Doping ◽  
Dark Blue ◽  
Pure Pedot

The electrochromic properties of an electrochemical polymerized composite consisted of poly (3,4-ethylenedioxythiophene) doped with fluorescent yellow dye (PEDOT-FY) are reported. The structures of PEDOT-FY were characterized via cycle voltammograms, spectroelectrochemistry and colorimetric analysis. Film of the PEDOT-FY composites with different FY concentrations appears multi-color changes, such as blue violet↔brillant blue, aubergine↔blue grey, magenta↔ aquamarine blue, orange-yellow↔grass-green, claybank↔moss green in the neutral state and the oxidized state respectively, which are different from the pure PEDOT of dark blue (-0.8V) and light blue (1.0V). The response time reaching 90% of the full optical contrast of PEDOT-FY was 3.4s for the oxidation process and 2.6s for the reverse reduction process when the [EDOT]/[FY] is 1:2, however, when the FY concentration decreased to [EDOT]/[FY] =1:0.01, the response time reduced to 1.9s and 1.7s for the oxidation and reduction process respectively, which is equal to that of the pure PEDOT. Additionally, the colorimetric analysis results show that components of yellow and red in PEDOT-FY films become stronger than pure PEDOT film at the whole electrochromic process. It is shown that acid dye doping is an effective method to broaden the color change range of the electrochromic mateials.

scholarly journals Film forming PVA-based cleaning systems for the removal of corrosion products from historical bronzes

2018 ◽  
Vol 90 (3) ◽  
pp. 507-522 ◽  
Author(s):  
Erica I. Parisi ◽  
Nicole Bonelli ◽  
Emiliano Carretti ◽  
Rodorico Giorgi ◽  
Gabriel M. Ingo ◽  
...  
Keyword(s):  
Film Formation ◽  
Poly Vinyl Alcohol ◽  
Complexing Agent ◽  
Film Forming ◽  
Innovative System ◽  
Mechanical Procedure ◽  
Cleaning Procedures ◽  
Film Formation Mechanism

AbstractThis paper presents an innovative poly(vinyl)alcohol-based film forming system, specifically devised for the controllable and selective cleaning of copper-based artifacts. Traditional cleaning procedures are commonly performed using mechanical and/or chemical methods. Unfortunately, both these methods present some limitations related to both the poor selectivity and invasiveness in case of the mechanical procedure, and to the scarce control over the involved reactions when dealing with a chemical approach. The innovative system proposed in this work allows combining the advantages of chemical and mechanical treatments thanks to the confinement of a complexing agent (EDTA) within a fluid, polymeric matrix, that is able to form a solid thin film upon drying. After treatment, the polymeric film can be completely removed from the artwork through a gentle peeling action. In this contribution, the film formation mechanism was investigated by means of thermal analysis and rheology; the role of plasticizers, volatile solvent fraction, and quantity of loaded EDTA is also discussed. Finally, the results of cleaning tests performed on artificially aged samples, and on a real case study, the “Fontana dei Mostri Marini” by Pietro Tacca in Florence, are presented.

Removal of hexavalent chromium from aqueous solution using exfoliated polyaniline/montmorillonite composite

2014 ◽  
Vol 70 (4) ◽  
pp. 678-684 ◽  
Author(s):  
Jun Chen ◽  
Xiaoqin Hong ◽  
Yongteng Zhao ◽  
Qianfeng Zhang
Keyword(s):  
Adsorption Capacity ◽  
Chemical Oxidation ◽  
Maximum Adsorption Capacity ◽  
Isothermal Model ◽  
Adsorption Characteristic ◽  
In Situ Chemical Oxidation ◽  
Acid Copolymer ◽  
Chemical Oxidation Polymerization ◽  
Effects Of Ph ◽  
Pseudo Second Order

Exfoliated polyaniline/montmorillonite (PANI/MMT) composites with nanosheet structure were successfully prepared by in situ chemical oxidation polymerization with MMT platelets as the scaffold. Amphoteric polymer, (2-methacryloyloxyethyl)trimethyl ammonium chloride and methacrylate acid copolymer, was used to modify montmorillonite and a large number of carboxylic acids were introduced on the surface of the clay platelets, which can be used as a dopant of PANI and play a ‘bridge’ role to combine PANI with clay. Adsorption experiments were carried out to study the effects of pH, contact time, Cr(VI) concentration, adsorbent dose and temperature. The adsorption of Cr(VI) on the PANI/MMT was highly pH dependent and the adsorption kinetics followed a pseudo-second-order model. The Langmuir isothermal model described the adsorption isotherm data well and the maximum adsorption capacity increased with the increase in temperature. Thermodynamic investigation indicated that the adsorption process is spontaneous, endothermic and marked with an increase in randomness at the adsorbent – liquid interface. The maximum adsorption capacity of the PANI/MMT composites for Cr(VI) was 308.6 mg/g at 25 °C. The excellent adsorption characteristic of exfoliated PANI/MMT composites will render it a highly efficient and economically viable adsorbent for Cr(VI) removal.

scholarly journals Active Packaging—Poly(Vinyl Alcohol) Films Enriched with Tomato By-Products Extract

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 141 ◽  
Author(s):  
Katalin Szabo ◽  
Bernadette-Emoke Teleky ◽  
Laura Mitrea ◽  
Lavinia-Florina Călinoiu ◽  
Gheorghe-Adrian Martău ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Total Phenolic Content ◽  
Food Packaging ◽  
Phenolic Content ◽  
Flow Behavior ◽  
Poly Vinyl Alcohol ◽  
Total Phenolic ◽  
Active Food Packaging ◽  
Film Forming ◽  
By Products

Active films were prepared from poly(vinyl alcohol) (PVA) blended with itaconic acid (Ia), and with chitosan (Ch), enriched with tomato processing by-products extract (TBE) in order to develop new bioactive formulations for food packaging. The effects of two biopolymers (Ch, Ia) and of the incorporated TBE—containing phenolic compounds and carotenoids—were studied regarding the physical and antimicrobial properties of films; in addition, their influence on the total phenolic content, viscosity, and flow behavior on the film-forming solutions was investigated. The results showed increased physical properties (diameter, thickness, density, weight) of the films containing the TBE versus their control. TBE and Ch conferred significant antimicrobial effects to PVA films toward all the tested microorganisms, whereas the best inhibition was registered against S. aureus and P. aeruginosa, with a minimum inhibitory concentration of <0.078 mg DW/mL. The Ia-PVA films also exhibited some antibacterial activity against P. aeruginosa (2.5 mg DW/mL). The total phenolic content of the film-forming solutions presented the highest values for the TBE and Ch-added PVA samples (0.208 mg gallic acid/100 mL film-forming solution). These results suggest that the PVA + Ch film containing TBE can be used for the development of intelligent and active food packaging materials.

scholarly journals Porous Polyvinyl Alcohol Membranes: Preparation Methods and Applications

Symmetry ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 960
Author(s):  
Andreas A. Sapalidis
Keyword(s):  
Melt Spinning ◽  
Mechanical Stability ◽  
Industrial Sector ◽  
Polymeric Membrane ◽  
Poly Vinyl Alcohol ◽  
Preparation Methods ◽  
Introductory Material ◽  
Film Forming ◽  
Great Progress ◽  
As Solubility

Polymeric membrane technology is a constantly developing field in both the research and industrial sector, with many applications considered nowadays as mature such as desalination, wastewater treatment, and hemodialysis. A variety of polymers have been used for the development of porous membranes by implementing numerous approaches such as phase inversion, electrospinning, sintering, melt-spinning and cold-stretching, 3D printing, and others. Depending on the application, certain polymer characteristics such as solubility to non-toxic solvents, mechanical and thermal stability, non-toxicity, resistance to solvents, and separation capabilities are highly desired. Poly (vinyl alcohol) (PVA) is a polymer that combines the above-mentioned properties with great film forming capabilities, good chemical and mechanical stability, and tuned hydrophilicity, rendering it a prominent candidate for membrane preparation since the 1970s. Since then, great progress has been made both in preparation methods and possible unique applications. In this review, the main preparation methods and applications of porous PVA based membranes, along with introductory material are presented.

Facile preparation of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)/graphene oxide nanocomposite for electrochromic applications

2019 ◽  
Vol 9 (5) ◽  
pp. 503-508
Author(s):  
Hai-Yun Jiang ◽  
Hui Zeng ◽  
Shi-Hao Zhang ◽  
Ruo-Mei Wu ◽  
Man-Chuan Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Indium Tin Oxide ◽  
Cycling Performance ◽  
Lithium Ions ◽  
Styrene Sulfonate ◽  
Color Changes ◽  
One Step ◽  
Poly Styrene Sulfonate ◽  
Dark Blue

An aqueous electrochromic composite poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)/graphene oxide was prepared in this study by a simple one-step in-situ polymerization. This simple one-step preparation method allowed the composite to achieve good performance without post-treatment. When the composite was coated on the indium tin oxide using as electrochromic film, it exhibited a noticeable electrochromism with reversible color changes from light blue to dark blue, and showed a wider range of discoloration (33%). The composite owns a larger diffusion coefficient of lithium ions (2.95 × 10–15 cm2 s–1) and better cycling performance compared with poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) film.

SYNTHESIS AND ELECTRORHEOLOGY OF PHOSPHORIC ACID DOPED POLYANILINE SUSPENSIONS

2005 ◽  
Vol 19 (07n09) ◽  
pp. 1149-1155 ◽  
Author(s):  
C. H. HONG ◽  
H. J. CHOI
Keyword(s):  
Phosphoric Acid ◽  
Electric Fields ◽  
Chemical Structure ◽  
Chemical Oxidation ◽  
Chemical Oxidation Polymerization ◽  
Ft Ir ◽  
Fourier Transform Ir ◽  
Doped Polyaniline ◽  
Er Fluids ◽  
High Voltage Generator

Semiconducting phosphoric acid doped polyaniline ( PANI-H 3 PO 4) particles were synthesized by chemical oxidation polymerization, and their chemical structure and particle size were examined via Fourier transform IR spectroscopy (FT-IR) and scanning electron microscopy (SEM), respectively. Electrorheological (ER) fluids were prepared by dispersing the synthesized PANI-H 3 PO 4 particles in kerosine, and their steady shear rheological properties under applied electric fields were investigated using a rotational rheometer with a high-voltage generator. The PANI-H 3 PO 4 synthesized in this study possesses a typical ER behavior: large increase of shear stress with applied electric field strengths.

Self-Assembly of Gold Nanoparticles on Gold Core-Induced Polypyrrole Nanohybrids for Electrochemical Sensor of Dopamine

NANO ◽  
2015 ◽  
Vol 10 (08) ◽  
pp. 1550115 ◽  
Author(s):  
Junwei Ding ◽  
Kai Zhang ◽  
Wei Xu ◽  
Zhiqiang Su
Keyword(s):  
Electron Microscopy ◽  
Gold Nanoparticles ◽  
Self Assembly ◽  
Chemical Oxidation ◽  
X Ray Diffraction ◽  
Detection Range ◽  
In Situ Chemical Oxidation ◽  
Gold Core ◽  
Transmission Electron ◽  
Chemical Oxidation Polymerization

Gold core-induced polypyrrole nanohybrids (Au–PPyNHs) were successfully synthesized via in situ chemical oxidation polymerization of pyrrole molecules, and their structure was directly confirmed and characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction. Furthermore, gold nanoparticles (AuNPs) were assembled onto the as-prepared Au–PPyNHs by electrostatic interaction to fabricate the nanohybrids of Au–PPyNH–Au. The created Au–PPyNH–Au nanohybrids was immobilized onto glassy carbon electrode and applied to construct dopamine (DA) sensor. We found that the fabricated sensor with Au–PPyNH–Au nanohybrids is highly specific probe for sensing DA. The Au–PPyNH–Au based DA sensor has a linear detection range from 1[Formula: see text][Formula: see text]M to 0.321 mM and a detection limit of 0.32[Formula: see text][Formula: see text]M.

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