Conducting polymer-silver composites

2013 ◽  
Vol 67 (8) ◽  
Author(s):  
Jaroslav Stejskal
Keyword(s):  
Conducting Polymer ◽  
Printed Electronics ◽  
Hybrid Composites ◽  
Silver Ions ◽  
Metallic Silver ◽  
Rich Variety ◽  
Antimicrobial Materials ◽  
Potential Applications ◽  
Silver Composites ◽  
Synthetic Approaches

AbstractPreparations of hybrid composites composed of two conducting components, a conducting polymer and silver, are reviewed. They are produced mainly by the oxidation of aniline or pyrrole with silver ions. In another approach, polyaniline or polypyrrole are used for the reduction of silver ions to metallic silver. Other synthetic approaches are also reviewed. Products of oxidation of aniline derivatives, including phenylenediamines, are considered. Morphology of both the conducting polymers and the silver in composites displays a rich variety. Conductivity of the composites seldom exceeds 1000 S cm−1 and seems to be controlled by percolation. Interfacial effects are also discussed. Potential applications of hybrid composites are outlined; they are likely to extend especially to conducting inks, printed electronics, noble-metal recovery, antimicrobial materials, catalysts, and sensors.

scholarly journals Enhanced Antibacterial Activity of Silver Doped Titanium Dioxide-Chitosan Composites under Visible Light

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1403 ◽  
Author(s):  
Jie Li ◽  
Bing Xie ◽  
Kai Xia ◽  
Yingchun Li ◽  
Jing Han ◽  
...  
Keyword(s):  
Particle Size ◽  
Antibacterial Activity ◽  
Titanium Dioxide ◽  
Visible Light ◽  
Silver Ions ◽  
Antibacterial Activities ◽  
Nano Tio2 ◽  
Inverse Emulsion ◽  
Potential Applications

Nano titanium dioxide (TiO2) with photocatalytic activity was firstly modified by diethanolamine, and it was then doped with broad spectrum antibacterial silver (Ag) by in situ method. Further, both Ag doped TiO2-chitosan (STC) and TiO2-chitosan (TC) composites were prepared by the inverse emulsion cross-linking reaction. The antibacterial activities of STC composites were studied and their antibacterial mechanisms under visible light were investigated. The results show that in situ doping and inverse emulsion method led to good dispersion of Ag and TiO2 nanoparticles on the cross-linked chitosan microsphere. The STC with regular particle size of 1–10 μm exhibited excellent antibacterial activity against E. coli, P. aeruginosa and S. aureus under visible light. It is believed that STC with particle size of 1–10 μm has large specific surface area to contact with bacterial cell wall. The increased antibacterial activity was attributed to the enhancement of both electron-hole separations at the surface of nano-TiO2 by the silver ions under the visible light, and the synergetic and sustained release of strong oxidizing hydroxyl radicals of nano-TiO2, together with silver ions against bacteria. Thus, STC composites have great potential applications as antibacterial agents in the water treatment field.

Silver Composites as Antimicrobial Materials

2020 ◽  
pp. 127-147
Author(s):  
David Romero-Fierro ◽  
Moisés Bustamante-Torres ◽  
Sandra Hidalgo-Bonilla ◽  
Emilio Bucio
Keyword(s):  
Antimicrobial Materials ◽  
Silver Composites

Effect of Composition of Fibers on Properties of Hybrid Composites

2017 ◽  
Vol 7 (4) ◽  
pp. 28-43
Author(s):  
R. Panneer
Keyword(s):  
Glass Fiber ◽  
Hybrid Composites ◽  
Low Cost ◽  
Natural Fibers ◽  
Absorption Capacity ◽  
Weight Percentage ◽  
Specific Strength ◽  
The Matrix ◽  
Potential Applications ◽  
Weight Design

Fibers embedded in the matrix of another material are the best example of modern day composite materials. Hybrid Composites made out of an amalgamation of Natural Fibers such as banana, jute, and coir along with glass fiber embedded in polymers have potential applications in automotive, aircraft and marine industries for their unique characteristics like high specific strength, light weight, design flexibility, corrosion resistance, biodegradability and low cost. In this work, epoxy hybrid composites reinforced with glass fiber mats and banana, jute, coir fibers of random lengths between 10-25 mm are prepared by varying their compositions in terms of weight percentage. The composites are fabricated by hand lay-up process and cut into test specimens as per ASTM Standards. Their mechanical characteristics such as Tensile Strength, Flexural Strength, Impact Strength, Hardness, Density and Water Absorption Capacity are evaluated and analysed.

Cyclic polyesters: synthetic approaches and potential applications

2011 ◽  
Vol 2 (2) ◽  
pp. 289-299 ◽  
Author(s):  
Jessica N. Hoskins ◽  
Scott M. Grayson
Keyword(s):  
Potential Applications ◽  
Synthetic Approaches

All-Solid-State pH Sensor Based on Conducting Polymer

2010 ◽  
Vol 93-94 ◽  
pp. 591-594 ◽  
Author(s):  
W. Natedungta ◽  
W. Prissanaroon-Ouajai
Keyword(s):  
Solid State ◽  
Conducting Polymer ◽  
Electrolyte Solution ◽  
Ph Sensor ◽  
Reference Electrode ◽  
Ph Measurement ◽  
Metallic Silver ◽  
Internal Solution ◽  
State Reference ◽  
Ph Electrode

A solid-state (free of internal electrolyte solution) reference electrode based on metallic silver is simply fabricated via a simple electrodeposition from AgNO3. Potentiometry is carried out to study the performance of the solid-state reference electrode in comparison with the commercial Ag/AgCl reference electrode. In addition, the proposed solid-state reference electrode has been integrated with the PPy-modified pH electrode to form an all-solid-state pH sensor, showing the capability of pH measurement. Absence of the internal solution leads to the pH sensor that is convenient to use and maintenance. In addition, the proposed pH sensor is possibly applied to biochemical and medical processes as well as flow infection analysis.

scholarly journals Effect of Chloride Ions on the Point-of-Use Drinking Water Disinfection Performance of Porous Ceramic Media Embedded with Metallic Silver and Copper

Water ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1625
Author(s):  
Rekha Singh ◽  
Woohang Kim ◽  
James A. Smith
Keyword(s):  
Drinking Water ◽  
Porous Ceramic ◽  
Chloride Ion ◽  
Silver Ions ◽  
Chloride Ions ◽  
Ion Concentration ◽  
Metallic Silver ◽  
E Coli ◽  
Ion Concentrations ◽  
Copper Release

This study quantifies the effects of chloride ions on silver and copper release from porous ceramic cubes embedded with silver and copper and its effect on E. coli disinfection in drinking water. Log-reduction of E. coli by silver ions decreased after 4 h of contact time as the chloride ion concentration increased from 0 to 250 mg/L but, it was not changed by copper ions under the same conditions. For silver addition by silver-ceramic cubes, log reductions of E. coli decreased sharply from 7.2 to 1.6 after 12 h as the chloride concentration increased from 0 to 250 mg/L. For the silver-ceramic cube experiments, chloride ion also reduced the total silver concentration in solution. After 24 h, total silver concentrations in solution decreased from 61 µg/L to 20 µg/L for corresponding chloride ion concentrations. According to the MINTEQ equilibrium model analysis, the decrease in disinfection ability with silver embedded ceramic cubes could be the result of precipitation of silver ions as silver chloride. This suggests that AgCl was precipitating within the pore space of the ceramic. These results indicate that, although ionic silver is a highly effective disinfectant for E. coli, the presence of chloride ions can significantly reduce disinfection efficacy. For copper-ceramic cubes, log reductions of E. coli by copper embedded cubes increased from 1.2 to 1.5 when chloride ion concentration increased from 0 to 250 mg/L. Total copper concentrations in solution increased from 4 µg/L to 14 µg/L for corresponding chloride ion concentrations. These results point towards the synergistic effect of chloride ions on copper oxidation as an increased concentration of chloride enhances copper release.

In situ reduction of antibacterial silver ions to metallic silver nanoparticles on bioactive glasses functionalized with polyphenols

2017 ◽  
Vol 396 ◽  
pp. 461-470 ◽  
Author(s):  
S. Ferraris ◽  
M. Miola ◽  
A. Cochis ◽  
B. Azzimonti ◽  
L. Rimondini ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Silver Ions ◽  
Metallic Silver ◽  
In Situ Reduction ◽  
Bioactive Glasses

Conducting Polymer/Clay Nanocomposites and Their Applications

2008 ◽  
Vol 8 (4) ◽  
pp. 1559-1581 ◽  
Author(s):  
Fei Fei Fang ◽  
Hyoung Jin Choi ◽  
Jinsoo Joo
Keyword(s):  
Thermal Degradation ◽  
Conducting Polymer ◽  
Clay Nanocomposites ◽  
Degradation Behavior ◽  
Preparation Methods ◽  
Xrd Pattern ◽  
Structure Characteristics ◽  
Thermal Degradation Behavior ◽  
Potential Applications ◽  
Er Fluids

This review aims at reporting on interesting and potential aspects of conducting polymer/clay nanocomposites with regard to their preparation, characteristics and engineering applications. Various conducting polymers such as polyaniline, polypyrrole and copolyaniline are introduced and three different preparation methods of synthesizing conducting polymer/clay nanocomposites are being emphasized. Morphological features, structure characteristics and thermal degradation behavior are explained based on SEM/TEM images, XRD pattern analyses and TGA/DSC graphs, respectively. Attentions are also being paid on conductive/magnetic performances as well as two potential applications in anti-corrosion coating and electrorheological (ER) fluids.

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