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Porous nanofiber membrane for detecting explosive vapor in humid environment and preparation method and application of porous nanofiber membrane

A nanofiber and wet environment technology, applied in the field of fluorescent detection of explosives, can solve the problems of unfavorable electron transfer energy and the inability to detect nitro explosives, etc., and achieve the effects of rapid mass production, adjustable fiber diameter, and easy operation

Active Publication Date: 2018-11-13
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the first generation of bisfluorene-based dendrimers p-nitro explosives (2,4-dinitrotoluene and 4-nitrobenzene) and aqueous interference substances (water, sunscreen, hair conditioner, coffee and perfume) produce similar fluorescence quenching responses, even though there are unfavorable electron transfer energies of vinyl dendrimer films and bifluorene-cored dendrimers and analytes, the fluorescence of these two materials will be suppressed by non-nitro Compound quenching (Nature Commun., 2015, 6, 4081.), indicating that many materials cannot be used for the detection of nitro explosives in humid areas

Method used

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  • Porous nanofiber membrane for detecting explosive vapor in humid environment and preparation method and application of porous nanofiber membrane
  • Porous nanofiber membrane for detecting explosive vapor in humid environment and preparation method and application of porous nanofiber membrane
  • Porous nanofiber membrane for detecting explosive vapor in humid environment and preparation method and application of porous nanofiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve 5mg of 9-(pyrene-1-yl)-9H-carbazole (PyCz) and 200mg of polystyrene (PS) together in 2ml of N,N-dimethylformamide (DMF), and seal it at room temperature Let the polystyrene (PS) swell for a period of time, then stir vigorously until the solid is completely dissolved, then add 600mg porogen (TX-100), and continue stirring vigorously at room temperature until the solution is uniform and transparent;

[0032] Inject the above-mentioned solution into a 2mL disposable plastic syringe, connect the open end with a stainless steel needle as the nozzle, connect it with the positive pole of the power supply, use aluminum foil as the receiving screen, connect it with the negative pole of the power supply, and apply 15kV between the nozzle and the receiving screen. voltage, set the advance speed of the syringe pump to 0.001mm / s, and conduct electrospinning under the condition that the receiving distance is 15cm, and prepare nanofibers containing porogen, and then receive th...

Embodiment 2

[0040] Example 2: 2mg 9-(pyrene-1-yl)-9H-carbazole (PyCz), 200mg polystyrene (PS) and 600mg porogen (TX-100) were dissolved together in 2ml N,N-bis In methylformamide (DMF) solvent, after sealing, place it at room temperature for a period of time to let the polystyrene swell, and then stir vigorously until the solution is uniform and transparent. Inject the above-mentioned solution into a 2mL disposable plastic syringe, connect the open end with a stainless steel needle as the nozzle, connect it with the positive pole of the power supply, use aluminum foil as the receiving screen, connect it with the negative pole of the power supply, and apply 18kV between the nozzle and the receiving screen. Voltage, set the advance speed of the syringe pump to 0.003mm / s, and conduct electrospinning under the condition that the receiving distance is 15cm, prepare nanofibers containing porogen, and then receive them on a quartz plate of 5mm×25mm×1mm on aluminum foil Utilization example Electr...

Embodiment 3

[0042] Example 3: 2mg 9-(pyrene-1-yl)-9H-carbazole (PyCz), 200mg polystyrene (PS) and 800mg porogen (TX-100) were dissolved together in 2ml N,N-bis In methylformamide (DMF) solvent, after sealing, place it at room temperature for a period of time to let the polystyrene swell, then stir vigorously until the solution is uniform and transparent, inject the above-mentioned solution into a 2mL disposable plastic syringe, The open end is connected to the stainless steel needle as the nozzle, connected to the positive pole of the power supply, and aluminum foil is used as the receiving screen, connected to the negative pole of the power supply, and a voltage of 15kV is applied between the nozzle and the receiving screen, and the advancing speed of the syringe pump is set to 0.003mm / s. Electrospinning was carried out at a distance of 15 cm, and nanofibers containing porogens were prepared.

[0043] Figure 7 For the polymer porous nanofibers prepared in the above-mentioned Example 3,...

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Abstract

The invention discloses a porous nanofiber membrane for detecting explosive vapor in a humid environment and a preparation method and application of the porous nanofiber membrane. The porous nanofibermembrane can detect the explosive vapor in the humid environment at a high sensitivity and a high selectivity and remove hydrous chaff mainly under the combined action of beneficial photoinduced electron transfer between 9-(pyrene-1-yl)-9H-carbazole and nitro explosives and the hydrophobic property of polystyrene, wherein the 9-(pyrene-1-yl)-9H-carbazole has delocalized pi-electrons, emits dark blue light and has a high charge transfer ability. The 9-(pyrene-1-yl)-9H-carbazole-doped porous composite fluorescent nanofiber membrane with the polystyrene as a base material is obtained through anelectrostatic spinning technology which is simple in operation, efficiency, quick and capable of achieving massive production, the porous nanofiber membrane can detect the nitro explosive vapor at a high sensitivity and a high selectivity and remove the hydrous chaff, and therefore, the sensor can detect the explosive vapor in the humid area at a high sensitivity and a high selectivity.

Description

technical field [0001] The invention belongs to the field of fluorescent detection of explosives, and in particular relates to a preparation method of a hydrophobic porous polymer nanofiber film doped with carbazole pyrene and its application in highly selective detection of explosive vapor in humid areas. Background technique [0002] Nitroaromatic explosives such as 2,4,6-trinitrotoluene, 2,4-dinitrotoluene and 4-nitrobenzene are common components of industrial explosives. The destructive, toxic, carcinogenic and mutagenic properties of these explosives pose serious threats to the environment and public health. Sensitive and selective detection of explosives is still an urgent problem in the fields of national security, military applications and environmental detection. [0003] If the sensor lacks selectivity, it means that the sensors based on these materials will not be widely deployed in various complex environments. The method for the selective detection of nitroaro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728
Inventor 石乃恩吴万丹黄维解令海汪联辉
Owner NANJING UNIV OF POSTS & TELECOMM
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