Composite Material Sensitive to Volatile Organic Compounds

2012 ◽  
Vol 730-732 ◽  
pp. 289-294 ◽  
Author(s):  
Roberto R. Lima ◽  
Leonardo F. Hernandez ◽  
Edsion Pecoraro ◽  
Estevão Rosim-Fachini ◽  
Maria L.P. da Silva
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Chemical Structure ◽  
Electronic Devices ◽  
Polar Compounds ◽  
Signal Recovery ◽  
Silicon Compounds ◽  
Sensor Development ◽  
Volatile Organic ◽  
Electronic Behavior

This work evaluates fluorinated thin films and their composites for sensor development. Composites were produced using 5 µm starch particles and plasma films obtained from organic fluorinated and silicon compounds reactants. Silicon wafers and aluminum trenches were used as substrates. Film thickness, refractive index and chemical structure were also determined. Scanning electron microscopy shows conformal deposition on aluminum trenches. Films deposited on silicon were exposed to vapor of volatile organic compounds and CV curves were obtained. A qualitative model (FemLab 3.2® program) was proposed for the electronic behavior. These environmentally correct films can be used in electronic devices and preferentially reacted to polar compounds. Nonetheless, due to the difficulty in signal recovery, these films are more effective in one-way sensors, in sub-ppm range.

Covalent post-synthetic modification of switchable iron-based coordination polymers by volatile organic compounds: a versatile strategy for selective sensor development

2020 ◽  
Vol 49 (22) ◽  
pp. 7315-7318 ◽  
Author(s):  
Esther Resines-Urien ◽  
Lucía Piñeiro-López ◽  
Estefania Fernandez-Bartolome ◽  
Arturo Gamonal ◽  
Mar Garcia-Hernandez ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Coordination Polymers ◽  
Spin Crossover ◽  
Sensor Development ◽  
Volatile Organic ◽  
Iron Based ◽  
Selective Sensor

A covalent post-synthetic modification is applied in one of the most relevant polymers to obtain unprecedented switchable spin crossover (SCO) materials.

scholarly journals Evaluation of a Hypercrosslinked Polystyrene, MN-200, as a Sorbent for the Preconcentration of Volatile Organic Compounds in Air

2000 ◽  
Vol 83 (3) ◽  
pp. 579-583 ◽  
Author(s):  
Maria P Baya ◽  
Panayotis A Siskos ◽  
Vadim A Davankov
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Polar Compounds ◽  
Average Percentage ◽  
Volatile Organic ◽  
Specific Retention Volumes ◽  
Specific Retention ◽  
Retention Volumes ◽  
And Storage ◽  
Indoor And Outdoor

Abstract Breakthrough volumes, average percentage recoveries, and storage stabilities were obtained for vapors of 8 volatile organic compounds (pentane, octane, undecane, isooctane, cyclohexane, toluene, methanol, and dichloromethane) on a new adsorbent material, Hypersol-Macronet, MN-200. Breakthrough volumes were estimated as half of the gas chromatographic specific retention volumes at 20°C for the compounds. Recoveries of the adsorbates were determined by both solvent extraction and thermal desorption methods. The results obtained compare favorably with those for Tenax GR (values reported in the published literature and others obtained in our laboratory). Results of storage stability studies on MN-200 meet the criterion for acceptability (<10% loss). High adsorption capacity for very volatile and polar compounds, combined with ease of desorption of less volatile compounds, render MN-200 a highly promising adsorbent for sampling volatile organic compounds in indoor and outdoor air.

Modification of cellulosic filler with diisocyanates – volatile organic compounds emission assessment and stability of chemical structure over time

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Aleksander Hejna ◽  
Mariusz Marć ◽  
Jerzy Korol
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Chemical Structure ◽  
Methylene Diphenyl Diisocyanate ◽  
Volatile Organic ◽  
Before And After ◽  
Potential Applications ◽  
The Impact ◽  
Term Storage ◽  
No Emissions

Abstract This paper investigated the impact of type and content of diisocyanate on the structure of modified cellulose fillers. Four the most popular isocyanates were applied – isophorone, hexamethylene, toluene and methylene diphenyl diisocyanate – at loadings of 1–15 wt%. Chemical structure, and its short-term storage stability, were investigated for eight weeks. Moreover, the main volatile organic compounds detected during modification, as well as emitted from fillers before and after storage, were identified. The main compounds detected in the air during modifications were terpenes and terpenoids. No diisocyanates were detected, which is very beneficial considering their toxicity. They were emitted from modified fillers at 40 °C, but only from fresh samples. After storage no emissions were noted, which indicated successful modification of fillers, also confirmed by FTIR spectroscopy and changes in polarity of fillers’ surface. Observed changes should be considered beneficial for the potential applications of modified fillers in manufacturing of polymer composites.

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