scholarly journals Hexa-peri-hexabenzocoronene in organic electronics

2012 ◽  
Vol 84 (4) ◽  
pp. 1047-1067 ◽  
Author(s):  
Helga Seyler ◽  
Balaji Purushothaman ◽  
David J. Jones ◽  
Andrew B. Holmes ◽  
Wallace W. H. Wong
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Organic Compounds ◽  
Organic Electronics ◽  
Aromatic Hydrocarbons ◽  
Photophysical Properties ◽  
Review Article ◽  
Liquid Crystallinity ◽  
Π Interactions ◽  
Synthesis Properties ◽  
Polycyclic Aromatic

Polycyclic aromatic hydrocarbons (PAHs) are in a class of functional organic compounds with increasing importance in organic electronics. Their tunable photophysical properties and typically strong intermolecular associations make them ideal materials in applications where control of charge mobility is essential. Hexa-peri-hexabenzocoronene (HBC) is a disc-shaped PAH that self-associates into columnar stacks through strong π–π interactions. By decorating the periphery of the HBC molecule with various substituents, a range of properties and functions can be obtained including solution processability, liquid crystallinity, and semiconductivity. In this review article, the synthesis, properties, and functions of HBC derivatives are presented with focus on work published in the last five years.

scholarly journals Achieving a healthy indoor environment by using an emissions barrier for stopping spread of chemicals from building into the indoor air

2021 ◽  
Author(s):  
Johan Mattsson ◽  
Lennart Larsson
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Indoor Air ◽  
Aromatic Hydrocarbons ◽  
Indoor Environment ◽  
Concrete Slab ◽  
Treated Wood ◽  
Volatile Organic ◽  
Polycyclic Aromatic

An emissions barrier was used in premises with indoor air complaints due to emissions from the buildings in question. The emissions comprised chlorophenols/chloroanisoles and polycyclic aromatic hydrocarbons (PAH) from treated wood, and volatile organic compounds (VOC), mainly 2-ethylhexanol, from PVC flooring and the glue used to paste the flooring onto a concrete slab. Attaching the barrier at the surfaces from where the emissions were spread (floor, walls, ceiling) resulted in a fresh and odour-free indoor air. We conclude that using an emissions barrier in buildings made unhealthy by moisture is an efficient way of restoring a pleasant and healthy indoor air.

scholarly journals Determination of Particles and Carcinogenic Compounds Emitted by Combustion of Diesel and Diesel:Biodiesel Blends

Proceedings ◽  
2018 ◽  
Vol 2 (23) ◽  
pp. 1505
Author(s):  
Samantha Arteaga-Del Angel ◽  
Brenda L. Valle-Hernandez ◽  
Violeta Mugica-Alvarez
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Organic Compounds ◽  
Aromatic Hydrocarbons ◽  
Alternative Fuels ◽  
Raw Materials ◽  
Diesel Emissions ◽  
Ultrasound Assisted Extraction ◽  
Assisted Extraction ◽  
Polycyclic Aromatic

Among the main pollutants emitted into the atmosphere by diesel combustion are the particles. Most of the studies suggest that the greatest impact on health by the particles is caused by some of the organic compounds such as the polycyclic aromatic hydrocarbons, which are highly toxic and carcinogenic compounds. Some of the strategies that are being implemented to mitigate these harmful particles emissions are the use of alternative fuels, such as biodiesel. In this research, the characterization of six fuels (diesel and five biodiesel, obtained from different raw materials) was carried out. Diesel:Biodiesel blends were prepared at 5, 10 and 20% of biodiesel on proportion to the diesel (B5, B10 and B20). Additionally, B100 was analyzed for some biodiesels. The particles emitted by the combustion of the different fuels were sampled and their concentration was determined. The organic compounds were extracted from the particles by ultrasound-assisted extraction and subsequently the polycyclic aromatic hydrocarbons (PAHs) were determined by gas chromatography coupled to mass spectrometry (GC-MS). In this study, it was observed that the use of biodiesel decreases the emission of particle concentration, but it is not significant. In the case of the concentrations of carcinogenic compounds (PAHs), the B20 biodiesel blends emissions had a statistically significant reduction compared to diesel emissions.

Modulating the Binding of Polycyclic Aromatic Hydrocarbons Inside a Hexacationic Cage by Anion-π Interactions

2014 ◽  
Vol 127 (2) ◽  
pp. 466-471 ◽  
Author(s):  
Nema Hafezi ◽  
James M. Holcroft ◽  
Karel J. Hartlieb ◽  
Edward J. Dale ◽  
Nicolaas A. Vermeulen ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Π Interactions ◽  
Polycyclic Aromatic

Use of External Radical Sources in Flash Vacuum Pyrolysis to Facilitate Cyclodehydrogenation Reactions in Polycyclic Aromatic Hydrocarbons

2014 ◽  
Vol 67 (9) ◽  
pp. 1338 ◽  
Author(s):  
Aaron W. Amick ◽  
Sara E. Martin
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Aromatic Hydrocarbons ◽  
Flash Vacuum Pyrolysis ◽  
Vacuum Pyrolysis ◽  
Ability To Act ◽  
New Process ◽  
Volatile Organic ◽  
Polycyclic Aromatic

A new process to facilitate the cyclodehydrogenation of polycyclic aromatic hydrocarbons (PAHs) in flash vacuum pyrolysis (FVP) using an external radical source is described. Using hexanes as an external radical source the conversion of various PAHs to their cyclodehydrogenated products is vastly increased. Various other volatile organic compounds were also examined to determine their ability to act as external radical sources in FVP.

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