Comparison between electroluminescent organic diodes based on new poly(2,7-fluorene phenylidene) derivatives and commercial polymers

2005 ◽  
Author(s):  
B. Arredondo ◽  
C. Coya ◽  
B. Romero ◽  
A. L. Alvarez ◽  
X. Quintana ◽  
...  
Keyword(s):  
Organic Diodes ◽  
Commercial Polymers

scholarly journals Kinetic Modelling of Biodegradability Data of Commercial Polymers Obtained under Aerobic Composting Conditions

Eng ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 54-68
Author(s):  
Ilenia Rossetti ◽  
Francesco Conte ◽  
Gianguido Ramis
Keyword(s):  
Kinetic Data ◽  
Kinetic Modelling ◽  
Kinetic Equations ◽  
Second Order ◽  
Aerobic Biodegradation ◽  
First Order ◽  
First Order Kinetics ◽  
Plastic Materials ◽  
Partial Degradation ◽  
Commercial Polymers

Methods to treat kinetic data for the biodegradation of different plastic materials are comparatively discussed. Different samples of commercial formulates were tested for aerobic biodegradation in compost, following the standard ISO14855. Starting from the raw data, the conversion vs. time entries were elaborated using relatively simple kinetic models, such as integrated kinetic equations of zero, first and second order, through the Wilkinson model, or using a Michaelis Menten approach, which was previously reported in the literature. The results were validated against the experimental data and allowed for computation of the time for half degradation of the substrate and, by extrapolation, estimation of the final biodegradation time for all the materials tested. In particular, the Michaelis Menten approach fails in describing all the reported kinetics as well the zeroth- and second-order kinetics. The biodegradation pattern of one sample was described in detail through a simple first-order kinetics. By contrast, other substrates followed a more complex pathway, with rapid partial degradation, subsequently slowing. Therefore, a more conservative kinetic interpolation was needed. The different possible patterns are discussed, with a guide to the application of the most suitable kinetic model.

scholarly journals Molecular characterization of commercial polymers

1971 ◽  
Vol 26 (3-4) ◽  
pp. 451-480 ◽  
Author(s):  
C. Strazielle ◽  
H. Benoît
Keyword(s):  
Molecular Characterization ◽  
Commercial Polymers

Origin of Negative Capacitance in Bipolar Organic Diodes

2018 ◽  
Vol 120 (11) ◽  
Author(s):  
Quan Niu ◽  
N. Irina Crăciun ◽  
Gert-Jan A. H. Wetzelaer ◽  
Paul W. M. Blom
Keyword(s):  
Negative Capacitance ◽  
Organic Diodes

Imperceptible Energy Harvesting Device and Biomedical Sensor based on Ultraflexible Ferroelectric Transducers and Organic Diodes

2020 ◽  
Author(s):  
Andreas Petritz ◽  
Esther Karner-Petritz ◽  
T. Uemura ◽  
Philipp Schäffner ◽  
Teppei Araki ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Flexible Electronics ◽  
Mechanical Stability ◽  
Blood Pressure Monitoring ◽  
Fast Response ◽  
Essential Elements ◽  
Ferroelectric Polymer ◽  
Organic Diodes ◽  
Harvesting Systems ◽  
First Time

Abstract Energy autonomy and conformability are essential elements in the next generation of wearable and flexible electronics for healthcare, robotics and cyber-physical systems. This study presents ferroelectric polymer transducers and organic diodes for imperceptible sensing and energy harvesting systems, which, for the first time, are integrated on ultrathin (1-µm) substrates, thus imparting them with unprecedented flexibility. Simulations show that the sensitivity of ultraflexible ferroelectric polymer transducers (UFPTs) is enhanced dramatically using an ultrathin substrate, which allows the mounting on 3D-shaped objects and the stacking in multiple layers. Indeed, UFPTs have superior sensitivity to strain and pressure, fast response and excellent mechanical stability, thus forming imperceptible wireless e-health patches for precise pulse and blood pressure monitoring. For harvesting biomechanical energy, UFPTs are combined with rectifiers based on the world’s first ultraflexible organic diodes thus comprising an imperceptible, 2.5 µm thin, energy harvesting device with an excellent peak power density of 3 mW⋅cm− 3.

scholarly journals Novel Psychrophiles and Exopolymers from Permafrost Thaw Lake Sediments

2020 ◽  
Vol 8 (9) ◽  
pp. 1282
Author(s):  
Ilaria Finore ◽  
Adrien Vigneron ◽  
Warwick F. Vincent ◽  
Luigi Leone ◽  
Paola Di Donato ◽  
...  
Keyword(s):  
Extracellular Enzymes ◽  
Extreme Environments ◽  
Rrna Gene ◽  
Bacterial Strains ◽  
Ice Melt ◽  
Permafrost Thaw ◽  
Phenotypic And Genetic Characterization ◽  
Pseudomonas Extremaustralis ◽  
Commercial Polymers ◽  
Thaw Lakes

Thermokarst lakes are one of the most abundant types of microbial ecosystems in the circumpolar North. These shallow basins are formed by the thawing and collapse of ice-rich permafrost, with subsequent filling by snow and ice melt. Until now, permafrost thaw lakes have received little attention for isolation of microorganisms by culture-based analysis. The discovery of novel psychrophiles and their biomolecules makes these extreme environments suitable sources for the isolation of new strains, including for potential biotechnological applications. In this study, samples of bottom sediments were collected from three permafrost thaw lakes in subarctic Québec, Canada. Their diverse microbial communities were characterized by 16S rRNA gene amplicon analysis, and subsamples were cultured for the isolation of bacterial strains. Phenotypic and genetic characterization of the isolates revealed affinities to the genera Pseudomonas, Paenibacillus, Acinetobacter,Staphylococcus and Sphingomonas. The isolates were then evaluated for their production of extracellular enzymes and exopolymers. Enzymes of potential biotechnological interest included α and β-glucosidase, α and β-maltosidase, β-xylosidase and cellobiohydrolase. One isolate, Pseudomonas extremaustralis strain 2ASCA, also showed the capability to produce, in the loosely bound cell fraction, a levan-type polysaccharide with a yield of 613 mg/L of culture, suggesting its suitability as a candidate for eco-sustainable alternatives to commercial polymers.

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