scholarly journals Synthesis, Adsorption, and Recognition Properties of a Solid Symmetric Tetramethylcucurbit[6]uril-Based Porous Supramolecular Framework

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Fei-Yang Tian ◽  
Rui-Xue Cheng ◽  
Yun-Qian Zhang ◽  
Zhu Tao ◽  
Qian-Jiang Zhu
Keyword(s):  
Hydrogen Bonding ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Outer Surface ◽  
Driving Force ◽  
Fluorescence Enhancement ◽  
Colour Change ◽  
Water Molecules ◽  
Supramolecular Framework ◽  
Volatile Organic

In this work, we reported a porous supramolecular framework (A) constructed of a symmetric tetramethylcucurbit[6]uril (TMeQ[6]) in aqueous HCl solutions; the driving force was the outer surface interaction of cucurbit[n]urils, as well as hydrogen bonding between latticed water molecules and portal carbonyl oxygens of TMeQ[6]. Adsorption experimental results revealed that the porous supramolecular framework can absorb certain fluorophore guests (FGs) to form luminescent assemblies (FG@As) by fluorescence enhancement or colour change, and some of them can respond to certain volatile organic compounds. Thus, the TMeQ[6]-based supramolecular framework could be used as a sensor for certain gas or volatile compounds.

scholarly journals Influence of Water Molecules on the Detection of Volatile Organic Compounds (VOC) Cancer Biomarkers by Nanocomposite Quantum Resistive Vapor Sensors vQRS

Chemosensors ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 64
Author(s):  
Abhishek Sachan ◽  
Mickaël Castro ◽  
Veena Choudhary ◽  
Jean-Francois Feller
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Water Molecules ◽  
Huge Amount ◽  
Detection Mechanism ◽  
Volatile Organic ◽  
Influence Of Water ◽  
Vapor Sensors ◽  
Detection Of Biomarkers ◽  
The Right

The anticipated diagnosis of various fatal diseases from the analysis of volatile organic compounds (VOC) biomarkers of the volatolome is the object of very dynamic research. Nanocomposite-based quantum resistive vapor sensors (vQRS) exhibit strong advantages in the detection of biomarkers, as they can operate at room temperature with low consumption and sub ppm (part per million) sensitivity. However, to meet this application they need to detect some ppm or less amounts of biomarkers in patients' breath, skin, or urine in complex blends of numerous VOC, most of the time hindered by a huge amount of water molecules. Therefore, it is crucial to analyze the effects of moisture on the chemo-resistive sensing behavior of carbon nanotubes based vQRS. We show that in the presence of water molecules, the sensors cannot detect the right amount of VOC molecules present in their environment. These perturbations of the detection mechanism are found to depend on the chemical interactions between water and other VOC molecules, but also on their competitive absorption on sensors receptive sites, located at the nanojunctions of the conductive architecture. This complex phenomenon studied with down to 12.5 ppm of acetone, ethanol, butanone, toluene, and cyclohexane mixed with 100 ppm of water was worth to investigate in the prospect of future developments of devices analysing real breath samples in which water can reach a concentration of 6%.

Separation of Volatile Organic Compounds from Water by Pervaporation

MRS Bulletin ◽  
1999 ◽  
Vol 24 (3) ◽  
pp. 50-53 ◽  
Author(s):  
R.W. Baker
Keyword(s):  
Volatile Organic Compounds ◽  
Vapor Pressure ◽  
Organic Compounds ◽  
Driving Force ◽  
Liquid Mixtures ◽  
Vapor Condensation ◽  
Gas Pressure ◽  
Vapor Pressures ◽  
Volatile Organic ◽  
The Difference

Pervaporation is a membrane process used to separate liquid mixtures. Separation is achieved by a combination of evaporation and membrane permeation. As a result, the process offers the possibility of removing dissolved volatile organic compounds (VOCs) from water, dehydrating organic solvents, and separating mixtures of components with close boiling points or azeotropes that are difficult to separate by distillation or other means.A schematic diagram of the pervaporation process is shown in Figure 1. In the example shown, the feed liquid is a solution of toluene in water which contacts one side of a membrane that is selectively permeable to toluene. The permeate, enriched in toluene, is removed as a vapor from the other side of the membrane. The driving force for the process is the difference in the partial vapor pressures of each component in the feed liquid and the permeate gas. This driving force can be increased by raising the temperature of the feed liquid to increase its vapor pressure or by decreasing the permeate gas pressure. The permeate gas pressure can be adjusted by using a vacuum pump, but industrially the most economical method is to cool and condense the vapor. Condensation spontaneously generates a vacuum. The permeate vapor pressure is then determined by the temperature of the permeate condenser and the composition of the permeate liquid generated by cooling and condensing the permeate vapor.Pervaporation membranes are made by coating a thin layer of selective polymer material onto a microporous support.

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