Preparation of PAA/WO3 composite films with enhanced electrochromism via layer-by-layer method

2018 ◽  
Vol 25 (3) ◽  
pp. 565-569
Author(s):  
Na Xu ◽  
Xiaodong Shen ◽  
Sheng Cui ◽  
Xibin Yi
Keyword(s):  
Composite Film ◽  
Color Change ◽  
Composite Films ◽  
Cost Effective ◽  
Electrochromic Property ◽  
Cyclic Voltammogram ◽  
Layer By Layer ◽  
High Porosity ◽  
Layer Method ◽  
Cost Effective Approach

Abstract The polyacrylic acid/tungsten oxide (PAA/WO3) composite films with good electrochromic properties have been prepared by a layer-by-layer method. The porous PAA layers were used as a template for the deposition of WO3, and finally, the composite film showed a network structure with high porosity. The electrochromic performance of the PAA/WO3 composite film was investigated by means of cyclic voltammogram (CV), chronoamperometry (CA), and transmittance measurements. The PAA/WO3 film also exhibited a remarkable electrochromism ability with the reversible color change from transparent colorless to dark blue and the transmittance change from 83% to 24% at 620 nm. This research provided a cost-effective approach for the preparation of PAA/WO3 composite films with controllable microstructure and good electrochromic property.

A facile process for preparation of polyaniline/polyacrylic acid composite electrochromism films

2011 ◽  
Vol 23 (7) ◽  
pp. 489-493 ◽  
Author(s):  
Na Xu ◽  
Xiaodong Shen ◽  
Sheng Cui ◽  
Xibin Yi
Keyword(s):  
Composite Film ◽  
Polyacrylic Acid ◽  
Large Scale ◽  
Color Change ◽  
Composite Films ◽  
Cyclic Voltammogram ◽  
Layer By Layer ◽  
Scale Production ◽  
High Porosity ◽  
Large Scale Production

The polyaniline was synthesized by the emulsion polymerization and the polyaniline/polyacrylic acid (PANI/PAA) composite films were prepared through a layer-by-layer method. The porous PAA layer was used as a template for the deposition of PANI, and finally the composite film showed a network structure with large surface area and high porosity. The facile process for preparation of PANI/PAA composite films was good for large-scale production and application. The electrochromic performance of the PANI/PAA composite film was investigated by means of cyclic voltammogram, chronoamperometry and transmittance measurements. The composite film showed three typical redox couples, and the response time for reduction and oxidation was 90 and 102 ms, respectively. The PANI/PAA films also exhibited remarkable electrochromism ability with a reversible color change from yellow to purple and a transmittance change from 68 to 27% at 550 nm.

scholarly journals Actuation Behavior of Multilayer Graphene Nanosheets/Polydimethylsiloxane Composite Films

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1243 ◽  
Author(s):  
Chunmei Zhang ◽  
Tianliang Zhai ◽  
Chao Zhan ◽  
Qiuping Fu ◽  
Chao Ma
Keyword(s):  
Composite Film ◽  
High Performance ◽  
Graphene Nanosheets ◽  
Composite Films ◽  
Multilayer Graphene ◽  
Layer By Layer ◽  
Pdms Film ◽  
Out Of Plane ◽  
Dielectric Actuation ◽  
Electromechanical Actuation

The graphene nanosheets (GNS)/polydimethylsiloxane (PDMS) composite films with out-of-plane dielectric actuation behavior were prepared through a layer-by-layer spin coating process. The GNS-PDMS/PDMS composite films with 1~3 layers of GNS-PDMS films were spin coated on top of the PDMS film. The dielectric, mechanical, and electromechanical actuation properties of the composite films were investigated. The dielectric constant of the GNS-PDMS3/PDMS composite film at 1 kHz is 5.52, which is 1.7 times that of the GNS-PDMS1/PDMS composite film. The actuated displacement of the GNS-PDMS/PDMS composite films is greatly enhanced by increasing the number of GNS-PDMS layers. This study provides a novel alternative approach for fabricating high-performance actuators with out-of-plane actuation behavior.

Easy-to-Fabricate K2Pd(SO3)2-Dyed Polyester Fabric with Highly Selective and Fast Response to Carbon Monoxide

2021 ◽  
Vol 21 (8) ◽  
pp. 4400-4405
Author(s):  
Junyeop Lee ◽  
Nam Gon Do ◽  
Dong Hyuk Jeong ◽  
Sae-Wan Kim ◽  
Maeum Han ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Color Change ◽  
High Sensitivity ◽  
Cost Effective ◽  
Fast Response ◽  
Polyester Fabric ◽  
High Porosity ◽  
Sensing Material ◽  
Sensitivity And Selectivity ◽  
And Performance

Carbon monoxide (CO) is an odorless, colorless, tasteless, extremely flammable, and highly toxic gas. It is produced when there is insufficient oxygen supply during the combustion of carbon to produce carbon dioxide (CO2). CO is produced from operating engines, stoves, or furnaces. CO poisoning occurs when CO accumulates in the bloodstream and can result in severe tissue damage or even death. Many types of CO sensors have been reported, including electrochemical, semiconductor metal-oxide, catalytic combustion, thermal conductivity, and infrared absorption-type for the detection of CO. However, despite their excellent selectivity and sensitivity, issues such as complexity, power consumption, and calibration limit their applications. In this study, a fabricbased colorimetric CO sensor is proposed to address these issues. Potassium disulfitopalladate (II) (K2Pd(SO3)2) is dyed on a polyester fabric as a sensing material for selective CO detection. The sensing characteristics and performance are investigated using optical instruments such as RGB sensor and spectrometer. The sensor shows immediate color change when exposed to CO at a concentration that is even lower than 20 ppm before 2 min. The fast response time of the sensor is attributed to its high porosity to react with CO. This easy-to-fabricate and cost-effective sensor can detect and prevent the leakage of CO simultaneously with high sensitivity and selectivity toward CO.

scholarly journals A Facile Strategy for Immobilizing GOD and HRP onto Pollen Grain and Its Application to Visual Detection of Glucose

2020 ◽  
Vol 21 (24) ◽  
pp. 9529
Author(s):  
Shanxia Jin ◽  
Liping Liu ◽  
Mengying Fan ◽  
Yaru Jia ◽  
Ping Zhou
Keyword(s):  
Visual Detection ◽  
Color Change ◽  
Cost Effective ◽  
Pollen Grain ◽  
Practical Application ◽  
Horse Radish Peroxidase ◽  
Experimental Conditions ◽  
Naked Eye ◽  
Cost Effective Approach ◽  
Affinity Interaction

Pollen grain was explored as a new carrier for enzyme immobilization. After being modified with boric acid-functionalized titania, the pollen grain was able to covalently immobilize glycosylated enzymes by boronate affinity interaction under very mild experimental conditions (e.g., pH 7.0, ambient temperature and free of organic solvent). The glucose oxidase and horse radish peroxidase-immobilized pollen grain became a bienzyme system. The pollen grain also worked as an indicator of the cascade reaction by changing its color. A rapid, simple and cost-effective approach for the visual detection of glucose was then developed. When the glucose concentration exceeded 0.5 mM, the color change was observable by the naked eye. The assay of glucose in body fluid samples exhibited its great potential for practical application.

An effective combination of electrodeposition and layer-by-layer assembly to construct composite films with luminescence switching behavior

2015 ◽  
Vol 44 (33) ◽  
pp. 14763-14770 ◽  
Author(s):  
Wenmei Gao ◽  
Hongwei Ma ◽  
Daming Zheng ◽  
Zhaojun Dong ◽  
Lixin Wu ◽  
...  
Keyword(s):  
Composite Film ◽  
Composite Films ◽  
Switching Behavior ◽  
Layer By Layer ◽  
Functional Composite ◽  
Layer By Layer Assembly ◽  
Effective Combination ◽  
Layer Assembly

A novel fabrication strategy for a functional composite film was explored, and the fluorescence performance was studied.

Self-Assembly of Large Scale CdS/TiO2 Film Photocatalyst

2012 ◽  
Vol 512-515 ◽  
pp. 1692-1698 ◽  
Author(s):  
Chun Xiang Li ◽  
Zhao Hua Jiang ◽  
Zhong Ping Yao
Keyword(s):  
Photoelectron Spectroscopy ◽  
Self Assembly ◽  
Large Scale ◽  
Crystal Size ◽  
Composite Films ◽  
Atomic Ratio ◽  
Layer By Layer ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Layer Method

CdS/TiO2 composite films with different Cd:Ti atomic ratio were prepared by a new straightforward particulate layer-by-layer method. Titanium dihydroxide and thiourea were used as precursors. Raman and X-ray photoelectron spectroscopy analysis for the composite films revealed that the TiO2 formed from titanium precursor retarded the crystal growth of CdS. Luminescence and UV–vis absorption spectra investigation showed that emission and absorption band of CdS/TiO2 blue shifted as crystal size of CdS decreased. Furthermore, hydrogen formation curves revealed that hydroxyl of CdS/TiO2 films plays an important role in water splitting reaction under both UV and visible light irradiations.

scholarly journals KARAKTERISASI FILM KOMPOSIT ALGINAT DAN KITOSAN

REAKTOR ◽  
2012 ◽  
Vol 14 (2) ◽  
pp. 158 ◽  
Author(s):  
Nur Rokhati ◽  
Bambang Pramudono ◽  
Nyoman Widiasa ◽  
Heru Susanto
Keyword(s):  
Composite Films ◽  
Raw Material ◽  
Layer By Layer ◽  
Permeability Test ◽  
Natural Polymers ◽  
Layer Method ◽  
Degree Of Swelling ◽  
Chitosan Films ◽  
Chitosan Composite

CHARACTERIZATION OF ALGINATE AND CHITOSAN COMPOSITE FILM. Due to the specific characteristics of (thin) films, the use of polymer films in various aplications has singnificantly increased. Alginate and chitosan are natural polymers, which have potential as a raw material for the manufacture of composite films. This paper presents the preparation and characterization of alginate, chitosan and chitosan-alginate composite films. The film characterization included permeability test, degree of swelling, mechanical property, morphology (by SEM), and surface chemistry (by FTIR). The results showed that alginate films have a higher permeability ​​and degree of swelling (DS) than chitosan films. Both permeability and DS decreased with increasing concentration for both alginate and chitosan films. DS experiments showed that the films have the highest DS in water followed by ethanol 95% and ethanol >99.9%, respectively. The mechanical strength of chitosan films was larger than alginate films. Alginate-chitosan composite films prepared by layer by layer method showed better characteristics than the composite films prepared by blending of alginate and chitosan solutions. Meningkatnya aplikasi film polimer di berbagai industri tidak terlepas dari keunggulan yang dimiliki. Alginat dan kitosan merupakan polimer alam yang mempunyai potensi sebagai bahan dasar pembuatan film komposit. Pada penelitian ini dilakukan pembuatan dan karakterisasi film komposit berbasis alginat dan kitosan. Karakterisasi film yang dilakukan meliputi uji: permeabilitas, derajat swelling, mekanik, morfologi (dengan SEM), dan struktur kimia permukaan (dengan FTIR). Hasil penelitian menunjukkan bahwa film alginat mempunyai nilai permeabilitas maupun derajat swelling yang lebih tinggi dibanding dengan film kitosan. Baik pada kitosan maupun alginat memberikan fenomena bahwa semakin besar konsentrasi larutan maka semakin kecil nilai permeabilitas maupun derajat swelling, dengan derajat swelling terhadap air adalah yang  paling besar kemudian diikuti oleh ethanol teknis (± 95%) dan yang terkecil adalah ethanol PA (> 99,9%). Kekuatan mekanik film kitosan lebih besar dibanding dengan film alginat. Film komposit alginat-kitosan yang dibuat dengan metode layer by layer memberikan karakteristik yang lebih baik dibanding dengan film komposit yang dibuat dengan pencampuran larutan alginat dan larutan kitosan.

scholarly journals Multifunctional Composite Film Based on Biodegradable Grape Skin and Polyvinyl Alcohol

2021 ◽  
Author(s):  
Zhe Qiu ◽  
Weidong Niu ◽  
Shuo Wang ◽  
Fanjun Yu ◽  
Yang Yu ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Composite Film ◽  
Color Change ◽  
Cellulose Nanofibers ◽  
Composite Films ◽  
Antimicrobial Properties ◽  
Grape Skin ◽  
Excellent Thermal Stability ◽  
Transmission Electron ◽  
Ultraviolet Shielding

Abstract In winemaking, large amounts of grape skin (GS) are produced as by-products, which contain not only abundant degradable cellulose, hemicellulose, and pectin but various functional polyphenols. In contrast to most studies focusing on the utilization of extractives, the current study investigates the use of an ultrasonicated grape skin (UGS) containing all components to develop a multifunctional composite film. Owing to dissociation during ultrasonication, all GS components were well dispersed in water to obtain the UGS suspension. Transmission electron microscopy (TEM) indicated that the celluloses were successfully transformed into cellulose nanofibers (CNFs), which can improve the uniformity of the composite film. Subsequently, biodegradable and multifunctional composite films were fabricated by combining the UGS and polyvinyl alcohol (PVA). The UGS and PVA formed a good interface owing to strong hydrogen bonds, and the resulting films exhibited excellent thermal stability and moisture-sensitive mechanical properties. The polyphenols in the UGS suspension endowed the composite film with multiple functions, including pH-responsive color change, excellent antioxidant activity, ultraviolet shielding, and antimicrobial properties. The use of PVA enhanced the flexibility, strength, and elongation of the UGS film. The easily prepared, tailored, multifunctional, and biodegradable UGS/PVA composite film exhibits excellent potential for application in agriculture, cosmetics, and healthcare.

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