scholarly journals Modification of Thin-Film Polymer Membranes by Microwave Radiation in Ammonia Medium

2018 ◽  
Vol 7 (4.36) ◽  
pp. 1050
Author(s):  
Dinar D. Fazullin ◽  
Elena A. Kharitonova ◽  
Gennady V. Mavrin
Keyword(s):  
Thin Film ◽  
Microwave Radiation ◽  
Specific Productivity ◽  
Wave Band ◽  
Ammonia Vapor ◽  
Nylon Membrane ◽  
Oil Emulsion ◽  
Separation Degree ◽  
Weight Decrease ◽  
Ammonia Medium

In this paper, we aimed to modify thin-film microfiltration membranes of nylon and polytetrafluoroethylene (PTFE) with ultrahigh-frequency (UHF) radiation within the decimeter wave band in ammonia vapor medium. It has been found that the treatment of a nylon membrane in ammonia leads to the membrane capacity decrease from 79% to 70.8% and to membrane weight decrease by 0.52%. And they observed the decrease of membrane weight by 0.24% from the original. In general, the treatment of membranes with microwave radiation in ammonia medium leads to specific productivity increase. They revealed the decrease of emulsion separation degree after the nylon membrane treatment by microwave radiation in ammonia environment. And when the oil emulsion is separated using PTFE-treated membranes, the degree of purification from oil increases by 3.6%, and the size of the separated oil particles also decreases from 118 nm to 49 nm.  

scholarly journals Modification of Membranes from Nylon by Microwave Radiation in Argon, Nitrogen and Atmospheric Air

2018 ◽  
Vol 7 (4.36) ◽  
pp. 1054 ◽  
Author(s):  
Dinar D. Fazullin ◽  
Elena A. Kharitonova ◽  
Gennady V. Mavrin ◽  
Ilnar A. Nasyrov
Keyword(s):  
Microwave Radiation ◽  
Membrane Surface ◽  
Microwave Treatment ◽  
Nitrogen Atmosphere ◽  
Specific Productivity ◽  
Nylon Membrane ◽  
Membrane Pore ◽  
Oil Emulsion ◽  
Emulsion Separation ◽  
Membrane Pore Size

Microfiltration thin-film membranes of nylon were treated with microwave radiation within the decimeter wavelength range in air, nitrogen and argon to increase the specific productivity and the degree of the resistant oil emulsion separation due to structural transformations in the surfaces and membrane pores. After the processing of nylon membrane in air, argon and nitrogen, the specific performance of the membranes increases during the filtration of distilled water by 1.3 times. This circumstance is connected, probably with the increase of membrane pore size. And when the oil emulsion is separated, the specific productivity is increased after the treatment in air and oxygen up to 2.3 times, and after the treatment in argon it is decreased by 2 times. The decrease in performance occurs apparently due to the crosslinking of the pores and the surface layer of the membrane. It has been established that the treatment of nylon membranes with microwave radiation in air, nitrogen and argon leads to the decrease of oil emulsion separation degree, which is explained by the membrane surface etching. The worst degree of purification makes 83% and it is observed after the separation of the emulsion with the membrane treated by microwave radiation in a nitrogen atmosphere, when the loss of membrane mass after the microwave treatment was 0.69%. The purification degree from oil is reduced in the least after the treatment in argon medium - 93, and the loss of membrane mass after treatment makes 0.26%. 

scholarly journals Improvement of Effectiveness of Separation of Emulsion by Processing Ptfe Membrane with Microwave Radiation

2018 ◽  
Vol 7 (4.7) ◽  
pp. 193 ◽  
Author(s):  
Dinar D. Fazullin ◽  
Elena A. Kharitonova ◽  
Aisilu M. Gimadieva ◽  
Gennady V. Mavrin
Keyword(s):  
Microwave Radiation ◽  
Treatment Time ◽  
Specific Productivity ◽  
Wave Band ◽  
Atmospheric Air ◽  
Aggressive Action ◽  
Initial Membrane ◽  
Emulsion Separation ◽  
Gaseous Media ◽  
Microfiltration Membranes

In this work, in order to increase the productivity and degree of separation of petroleum emulsions, a modification of thin-film microfiltration membranes from polytetrafluoroethylene (PTFE) by ultrahigh-frequency (microwave) radiation in the decimeter wave band in air, nitrogen and argon was carried out. Treatment of membranes with microwave radiation leads to a reduction in the mass of PTFE membranes depending on the treatment time and the gaseous media. The membrane weight decreases most strongly to 0.17% when treated in atmospheric air, which is apparently due to the aggressive action of oxygen. The least mass of the membrane decreases when treated in argon, only 0.06%. The increase in the specific productivity of membranes during processing in the atmosphere of atmospheric air is explained by the hydrophilization of the surface, due to the formation of polar oxygen-containing groups. A decrease in specific productivity when treated in an argon inert gas environment occurs apparently due to crosslinking of the surface layer. Treatment of the membrane in a nitrogen medium increases the degree of emulsion separation by 6.9%, in air media by 15.3%, in argon media by 21%. An increase in the efficiency of separation of emulsions is also confirmed by a decrease in the size of oil particles in filtrates of emulsions. So the limiting size of the particles of the disperse phase cut off by the initial membrane was 118 nm, and the membrane treated with microwave radiation in the air medium was 39 nm, in the nitrogen medium 68 nm and in argon medium 10 nm.  

Fast Development of Self‐Assembled, Highly Oriented Polymer Thin Film and Observation of Dual Sensing Behavior of Thin Film Transistor for Ammonia Vapor

2019 ◽  
Vol 220 (11) ◽  
pp. 1900010
Author(s):  
Praveen Kumar Sahu ◽  
Lalit Chandra ◽  
Rajiv K. Pandey ◽  
Niraj Singh Mehta ◽  
R. Dwivedi ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Film Transistor ◽  
Ammonia Vapor ◽  
Oriented Polymer ◽  
Polymer Thin Film ◽  
Fast Development ◽  
Self Assembled ◽  
Dual Sensing

scholarly journals Separation of Oil Emulsion with Dynamic Membrane with Surface Layer of Polystyrene

2021 ◽  
Vol 132 (1) ◽  
pp. 10-14
Author(s):  
D. D. Fazullin ◽  
◽  
G. V. Mavrin ◽  
L. I. Fazullina ◽  
◽  
...  
Keyword(s):  
Surface Layer ◽  
Membrane Separation ◽  
Membrane Surface ◽  
Specific Productivity ◽  
Dispersed Phase ◽  
Retention Capacity ◽  
Dynamic Membrane ◽  
Oil Emulsion ◽  
Membrane Particle ◽  
Oil Particles

In this paper, we studied the parameters of the process of separation of oil emulsion using a dynamic membrane of ultrafiltration PTFEg-PSd. A polymer membrane with a dynamic layer of polystyrene particles with sizes from 55 to 72 nm was obtained on a substrate of hydrophilic polytetrafluoroethylene (PTFE). The results of scanning electron microscopy showed the formation of a layer of spherical polystyrene particles on the membrane surface. The properties of a dynamic membrane were studied: porosity, moisture capacity, and wettability. After applying the polystyrene layer, an increase in the hydrophobicity of the surface layer of the membrane was established. For membrane separation, a 1% oil emulsion was prepared by dispersing the carbonaceous oil. The retention capacity of membranes for oil products from 1% oil emulsion was 96.4%, with a specific productivity of 113 dm3/m2·h which is not inferior to the performance of a commercial UPM-100 ultrafiltration membrane. Particle sizes of the dispersed phase in a 1% oil emulsion are distributed in the range from 229 to 1476 nm, after separation of the emulsion by a dynamic membrane, oil particles with sizes from 134 to 236 nm were detected in the filtrate, which indicates the removal of the bulk of the dispersed phase from the emulsion by ultrafiltration membranes.

Design and Simulation of Infrared Absorption Based on Hydrogenated Amorphous Silicon Thin Film

2011 ◽  
Vol 383-390 ◽  
pp. 4702-4707
Author(s):  
Jun Wei Fu ◽  
Wei Li ◽  
Mao Yang Wu ◽  
Min He ◽  
Ya Dong Jiang
Keyword(s):  
Thin Film ◽  
Amorphous Silicon ◽  
Infrared Absorption ◽  
Hydrogenated Amorphous Silicon ◽  
Far Infrared ◽  
Wave Band ◽  
Silicon Thin Film ◽  
Tin Film ◽  
Wide Range ◽  
Hydrogenated Amorphous

Hydrogenated amorphous silicon (a-Si:H) thin film has nowadays attracted much attention in a wide range of electronic applications as in image sensors and in solar cells because of its merits and compatibility with semiconductor technology. In this paper, the background of a-Si:H thin film technology and microbolometer technology has been described in details. According to optical admittance matrix method, the multilayer film system based on a-Si:H thin film was simulated by MatLab software, mainly for the simulation of infrared absorption layers and the simulation of microbolometer. The results show that the combination of TiN film and a-Si:H film is suitable for the design of microbolometer within the middle and far infrared wave band (8-14µm), and the infrared absorptivity of the modified microbolometer can reach over 90%.

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