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Related Concept Videos

Vaporization01:18

Vaporization

38.1K
The physical form of a substance changes by changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. For vaporization to occur, kinetic energy must be greater than the intermolecular forces that keep molecules bonded. The amount of energy needed to vaporize a quantity of liquid at a given pressure and a constant temperature is called the heat of vaporization. When...
38.1K
Vapor Pressure02:34

Vapor Pressure

40.7K
When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
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Vapor Pressure Lowering03:28

Vapor Pressure Lowering

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The equilibrium vapor pressure of a liquid is the pressure exerted by its gaseous phase when vaporization and condensation are occurring at equal rates:
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Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

21.3K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
21.3K
Vapor Pressure of Fluid01:28

Vapor Pressure of Fluid

2.0K
The vapor pressure of a fluid is a crucial concept in fluid mechanics, influencing phenomena such as boiling and cavitation. Vapor pressure refers to the pressure exerted by a vapor at a state of thermodynamic equilibrium with its corresponding liquid phase at a specific temperature. It represents the tendency of molecules to escape from the fluid surface into the vapor phase.
When a liquid is placed in a closed container with a small air space, and the space is evacuated, vapor molecules will...
2.0K
Distillation: Vapor–Liquid Equilibria01:01

Distillation: Vapor–Liquid Equilibria

4.6K
Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube...
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Elucidating the Metabolism of 2,4-Dibromophenol in Plants
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A Portable Biosensor for 2,4-Dinitrotoluene Vapors.

Marc Prante1, Christian Ude2, Miriam Große3

  • 1Institute of Technical Chemistry, Leibniz University of Hannover, 30167 Hannover, Germany. prante@iftc.uni-hannover.de.

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|December 6, 2018
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Summary

A new wireless biosensor detects landmine vapors, specifically 2,4-dinitrotoluene (DNT), a volatile marker from explosives. This cost-effective device offers a promising alternative for landmine detection without metal reliance.

Keywords:
biological sensorbioluminescencebiosensorchemical vapor signatureexplosive materiallandmine detection

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Area of Science:

  • Environmental Science
  • Biosensor Technology
  • Chemical Detection

Background:

  • Landmines pose global safety risks due to hazardous explosive compounds like TNT.
  • Vapors from explosives, such as 2,4-dinitrotoluene (DNT), offer a non-metallic detection pathway.
  • DNT is a volatile byproduct of TNT synthesis, making it a suitable marker for landmine detection.

Purpose of the Study:

  • To develop a wireless, portable, and cost-effective biosensor for detecting 2,4-dinitrotoluene (DNT) vapors.
  • To explore the potential of a bioluminescent bacterial biosensor as an alternative to traditional landmine detection methods.

Main Methods:

  • Construction of a biosensor utilizing recombinant bioluminescent bacteria and a portable optical detection device.
  • Investigation of environmental factors (temperature, oxygen) and immobilization techniques on bioluminescence.
  • Optimization of sensor prototypes, including analysis of oxygen penetration in agarose gels.

Main Results:

  • Aeration with molecular oxygen is crucial for maintaining bioluminescence at high cell densities.
  • Sensor prototypes were optimized to enhance radiation surface for improved sensitivity.
  • Successful detection of 50 parts per billion (ppb) gaseous 2,4-DNT was achieved.

Conclusions:

  • A wireless, cost-effective biosensor for DNT detection was successfully developed.
  • The biosensor demonstrates potential as a viable alternative for landmine detection.
  • Optimization of oxygen supply and sensor design is key for effective bioluminescence-based detection.