Infrared Hollow Waveguide Sensors for Simultaneous Gas Phase Detection of Benzene, Toluene, and Xylenes in Field Environments

2011 ◽  
Vol 83 (16) ◽  
pp. 6141-6147 ◽  
Author(s):  
Christina R. Young ◽  
Nicola Menegazzo ◽  
Andrew E. Riley ◽  
Cornelius H. Brons ◽  
Frank P. DiSanzo ◽  
...  
Keyword(s):  
Gas Phase ◽  
Phase Detection ◽  
Hollow Waveguide ◽  
Benzene Toluene ◽  
Waveguide Sensors

11H-Pyrido[2,1-b]quinazolin-11-one - A reversible Turn-on/off Fluorescent Probe for Solution and Gas-phase Detection of Acids or Basic Amines

2021 ◽  
pp. 109536
Author(s):  
João Victor L. Silva Néto ◽  
Rodolfo I. Teixeira ◽  
Ramon B. da Silva ◽  
Nanci C. de Lucas ◽  
Simon J. Garden
Keyword(s):  
Gas Phase ◽  
Fluorescent Probe ◽  
Phase Detection ◽  
Turn On

First gas-phase detection of dimethylgermylene and time-resolved study of some of its reactions

1996 ◽  
Vol 250 (1) ◽  
pp. 111-119 ◽  
Author(s):  
R. Becerra ◽  
S.E. Boganov ◽  
M.P. Egorov ◽  
V.Ya. Lee ◽  
O.M. Nefedov ◽  
...  
Keyword(s):  
Gas Phase ◽  
Phase Detection ◽  
Time Resolved

Gas Phase Detection of the NH–P Hydrogen Bond and Importance of Secondary Interactions

2015 ◽  
Vol 119 (44) ◽  
pp. 10988-10998 ◽  
Author(s):  
Kristian H. Møller ◽  
Anne S. Hansen ◽  
Henrik G. Kjaergaard
Keyword(s):  
Hydrogen Bond ◽  
Gas Phase ◽  
Phase Detection ◽  
Secondary Interactions

Pyrolysis of Methane to Higher Hydrocarbons: A Thermodynamic Study

1989 ◽  
Vol 42 (10) ◽  
pp. 1655 ◽  
Author(s):  
FP Larkins ◽  
AZ Khan
Keyword(s):  
Gas Phase ◽  
Pressure Range ◽  
Solid Carbon ◽  
Free Energies ◽  
Oxidation Of Methane ◽  
Conversion Of Methane ◽  
Equilibrium Conversion ◽  
Benzene Toluene ◽  
Higher Hydrocarbons ◽  
The Individual

Some basic thermodynamic parameters such as Gibbs free energies, enthalpies of reactions and equilibrium compositions of products from the pyrolysis and partial oxidation of methane to higher hydrocarbons in the gas phase have been determined within a consistent framework for the temperature range 800-1500 K and the pressure range 0.1-3 MPa , by using the CSIRO-SGTE THERMODATA system. It has been established that the pyrolysis of methane to higher hydrocarbons, e.g. acetylene, ethylene, ethane, prop-1-ene, propane, benzene, toluene, naphthalene, 1-methylnaphthalene and 2-methylnaphthalene, considered as separate reactions, is a highly endothermic reaction with the Gibbs free energies for the individual reactions being positive until 1300 K. The aromatics are thermodynamically most favoured with the equilibrium yields increasing with temperature. Addition of O2 lowers the heats of synthesis and the free energies for methane conversion but no enhancement in the equilibrium yields of hydrocarbons is observed. When solid carbon is allowed, it is the dominant product in all cases with the equilibrium yields for all hydrocarbons becoming negligible. Increasing the pressure at a particular temperature has more effect on the lowering of the equilibrium conversion of methane than on the suppression of solid carbon. Such data are valuable for understanding the conversion limits for methane into higher hydrocarbons.

Development of a Latching Valve for Micro-Chem-Lab™

1999 ◽  
Author(s):  
C. Channy Wong ◽  
Douglas R. Adkins ◽  
Ronald P. Manginell ◽  
Gregory C. Frye-Mason ◽  
Peter J. Hesketh ◽  
...  
Keyword(s):  
Power Consumption ◽  
Gas Phase ◽  
Flow Rate ◽  
Integrated System ◽  
Dead Volume ◽  
Design Parameters ◽  
Working Fluid ◽  
Driving Voltage ◽  
Magnetic Actuation ◽  
Phase Detection

Abstract An integrated microsystem to detect traces of chemical agents (μChemLab™) is being developed at Sandia for counter-terrorism and nonproliferation applications. This microsystem has two modes of operation: liquid and gas phase detection. For the gas phase detection, we are integrating these critical components: a preconcentrator for sample collection, a gas chromatographic (GC) separator, a chemically selective flexural plate wave (FPW) array mass detector, and a latching valve onto a single chip. By fabricating these components onto a single integrated system (μChemLab™ on a chip), the advantages of reduced dead volume, lower power consumption, and smaller physical size can be realized. In this paper, the development of a latching valve will be presented. The key design parameters for this latching valve are: a volumetric flow rate of 1 mL/min, a maximum hold-off pressure of 40 kPa (6 psi), a relatively low power, and a fast response time. These requirements have led to the design of a magnetically actuated latching relay diaphragm valve. Magnetic actuation is chosen because it can achieve sufficient force to effectively seal against back pressure and its power consumption is relatively low. The actuation time is rapid, and valve can latch in either an open or closed state. A corrugated parylene membrane is used to separate the working fluid from internal components of the valve. Corrugations in the parylene ensure that the diaphragm presents minimum resistance to the actuator for a relativley large deflection. Two different designs and their performance of the magnetic actuation have been evaluated. The first uses a linear magnetic drive mechanism, and the second uses a relay mechanism. Preliminary results of the valve performance indicates that the required driving voltage is about 10 volts, the measured flow rate is about 50 mL/min, and it can hold off pressure of about 5 psi (34 kPa). Latest modifications of the design show excellent performance improvements.

Gas-phase detection of the FCO2 radical by millimeter wave and high resolution infrared spectroscopy assisted by ab initio calculations

2003 ◽  
Vol 118 (3) ◽  
pp. 1214-1220 ◽  
Author(s):  
Zdeněk Zelinger ◽  
Pascal Dréan ◽  
Adam Walters ◽  
Juan Ramon Avilès Moreno ◽  
Marcel Bogey ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
High Resolution ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Gas Phase ◽  
Millimeter Wave ◽  
Phase Detection

scholarly journals Gas phase detection of tributyltin chloride arising from aqueous and solid matrices

2002 ◽  
Vol 17 (11) ◽  
pp. 1506-1510 ◽  
Author(s):  
Chrystelle Bancon-Montigny ◽  
Paulette Maxwell ◽  
Lu Yang ◽  
Zoltán Mester ◽  
Ralph E. Sturgeon ◽  
...  
Keyword(s):  
Gas Phase ◽  
Phase Detection ◽  
Tributyltin Chloride ◽  
Solid Matrices

Photocatalytic oxidation of benzene, toluene, ethylbenzene and m-xylene in the gas-phase over TiO2-based catalysts

2012 ◽  
Vol 244 ◽  
pp. 24-31 ◽  
Author(s):  
Christos A. Korologos ◽  
Maria D. Nikolaki ◽  
Caterina N. Zerva ◽  
Constantine J. Philippopoulos ◽  
Stavros G. Poulopoulos
Keyword(s):  
Gas Phase ◽  
Photocatalytic Oxidation ◽  
Benzene Toluene ◽  
Oxidation Of Benzene
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