The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Mahabir Parshad Kaushik - One of the best experts on this subject based on the ideXlab platform.
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detection of diMethyl Methyl Phosphonate a simulant of sarin the highly toxic chemical warfare using platinum activated nanocrystalline zno thick films
Sensors and Actuators B-chemical, 2012Co-Authors: L.a. Patil, A.r. Bari, M.d. Shinde, V.v. Deo, Mahabir Parshad KaushikAbstract:Abstract Nanocrystalline ZnO powder was prepared using ultrasonic atomization technique. Thick films of this powder were prepared using simple screen printing technique. Pt-modified-ZnO (platinum activated) films were obtained by dipping pure ZnO films into an aqueous solution of chloroplatnic acid for different intervals of time, followed by firing at 500 °C for 30 min. The sensing performance of the unmodified (pure) and Pt-modified ZnO (Pt–ZnO) films was tested on exposure of CWAs (chemical warfare agents) simulants, such as, diMethyl Methyl Phosphonate (DMMP), 2-chloroethyl ethyl sulfide (CEES) and 2-chloroethyl phenyl sulfide (CEPS). Both pure ZnO and Pt–ZnO films showed higher response to DMMP than their responses to CEES and CEPS. The simulant response, selectivity, response time and recovery time of the sensors were measured and presented. The role played by surface platinum species in the better simulant sensing performance is discussed.
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Detection of diMethyl Methyl Phosphonate – a simulant of sarin: The highly toxic chemical warfare – using platinum activated nanocrystalline ZnO thick films
Sensors and Actuators B: Chemical, 2012Co-Authors: L.a. Patil, A.r. Bari, M.d. Shinde, V.v. Deo, Mahabir Parshad KaushikAbstract:Abstract Nanocrystalline ZnO powder was prepared using ultrasonic atomization technique. Thick films of this powder were prepared using simple screen printing technique. Pt-modified-ZnO (platinum activated) films were obtained by dipping pure ZnO films into an aqueous solution of chloroplatnic acid for different intervals of time, followed by firing at 500 °C for 30 min. The sensing performance of the unmodified (pure) and Pt-modified ZnO (Pt–ZnO) films was tested on exposure of CWAs (chemical warfare agents) simulants, such as, diMethyl Methyl Phosphonate (DMMP), 2-chloroethyl ethyl sulfide (CEES) and 2-chloroethyl phenyl sulfide (CEPS). Both pure ZnO and Pt–ZnO films showed higher response to DMMP than their responses to CEES and CEPS. The simulant response, selectivity, response time and recovery time of the sensors were measured and presented. The role played by surface platinum species in the better simulant sensing performance is discussed.
Chunxia Liu - One of the best experts on this subject based on the ideXlab platform.
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Extraction kinetics of uranium(VI) and thorium(IV) with di(1-Methyl-heptyl)Methyl Phosphonate from nitric acid medium using a Lewis cell
Separation and Purification Technology, 2019Co-Authors: Lianjun Song, Lan Zhang, Ying Liu, Songdong Ding, Mengling Tan, Chunxia LiuAbstract:Abstract The extraction kinetics of uranium(VI) and thorium(IV) with di(1-Methyl-heptyl)Methyl Phosphonate (DMHMP) dissolved in kerosene were investigated from HNO3 media. Experiments were performed in a constant interfacial area stirred Lewis cell. The results with the influence of stirring speed, specific interfacial area, and temperature indicated that the extraction process was governed by diffusion in the bulk phase or by chemical reaction at the liquid-liquid interface at the stirring speed below or above 140 rpm, respectively. The activation energies for the reactions were calculated as 28.5 kJ·mol−1 and 26.8 kJ·mol−1 for U(VI) and Th(IV), respectively. Meanwhile, the obtained thermodynamic parameters (ΔH, ΔS and ΔG) revealed that the extraction of both U(VI) and Th(IV) was an endothermic and non-spontaneous process and the structure of the extracted species was more ordered than that of the extractant itself. Furthermore, the influences of initial concentrations of HNO3, DMHMP and metal ions on the extraction rates were also examined. Based on the reaction orders with respect to the reactants, the rate equations and the extraction mechanism for U(VI) and Th(IV) were also presented.
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Radiolysis products and degradation mechanism studies on di-1-Methyl heptyl Methyl Phosphonate
Journal of Radioanalytical and Nuclear Chemistry, 2017Co-Authors: Cao Xiaojun, Haogui Zhao, Chunxia Liu, Wang Jinhua, Lan ZhangAbstract:Di-1-Methyl heptyl Methyl Phosphonate (DMHMP) is a promising alternative extractant for Th-U fuel reprocessing, in which the irradiation stability of extractant should be systematically studied. In this paper, the radiolysis products of DMHMP were analyzed qualitatively and quantitatively with gas and ion chromatograph, the possible radiolysis mechanism of DMHMP was also concluded. Moreover, the effect of structure on the radiolysis products and irradiation stability of neutral organophosphorus compound extractant was also discussed.
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Highly efficient extraction separation of uranium(VI) and thorium(IV) from nitric acid solution with di(1-Methyl-heptyl) Methyl Phosphonate
Separation and Purification Technology, 2015Co-Authors: Mengling Tan, Lan Zhang, Songdong Ding, Chao Huang, Chunxia LiuAbstract:The extraction behaviors of U(VI) and Th(IV), as well as the extraction of HNO3 were investigated by using di(1-Methyl-heptyl) Methyl Phosphonate (DMHMP) as an extractant and kerosene as a diluent. Effects of contact time, acidity, concentration of extractant and temperature on the distribution ratios of U(VI) and Th(IV) were evaluated. HNO3 was extracted as mono-solvated species. In the investigation of acidity range from 0.01 to 6.0 mol/L, the distribution ratios of U(VI) and Th(IV) increased at first with the rise of HNO3 concentration up to 3.0 mol/L and then decreased. DMHMP exhibited higher selectivity for U(VI) than for Th(IV) with the separation factor SFU/Th values of 25-120, whereas under the same conditions, tri-n-butyl-phosphate (TBP) only had SFU/Th, values of 1.4-26. Slope analyses showed that U(VI) and Th(IV) were extracted as di-solvated and tri-solvated species respectively. The thermodynamic parameters (Delta H, Delta S and Delta G) were presented and revealed that the extraction was exothermic. For the extraction of Th(VI) from various HNO3 by 30 vol.% DMHMP or TBP, the limiting organic concentration (LOC) was also given. FT-IR spectra indicated that it was P=O bond, not P-O bond that took part in the coordination with U(VI) and Th(IV). In addition, the solubility of DMHMP and TBP in various concentration HNO3 was determined using ICP-AES, and their thermal stability in air was also examined through TGA. DMHMP has much lower water solubility and higher thermal stability than TBP. (C) 2015 Elsevier B.V. All rights reserved.
L.a. Patil - One of the best experts on this subject based on the ideXlab platform.
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detection of diMethyl Methyl Phosphonate a simulant of sarin the highly toxic chemical warfare using platinum activated nanocrystalline zno thick films
Sensors and Actuators B-chemical, 2012Co-Authors: L.a. Patil, A.r. Bari, M.d. Shinde, V.v. Deo, Mahabir Parshad KaushikAbstract:Abstract Nanocrystalline ZnO powder was prepared using ultrasonic atomization technique. Thick films of this powder were prepared using simple screen printing technique. Pt-modified-ZnO (platinum activated) films were obtained by dipping pure ZnO films into an aqueous solution of chloroplatnic acid for different intervals of time, followed by firing at 500 °C for 30 min. The sensing performance of the unmodified (pure) and Pt-modified ZnO (Pt–ZnO) films was tested on exposure of CWAs (chemical warfare agents) simulants, such as, diMethyl Methyl Phosphonate (DMMP), 2-chloroethyl ethyl sulfide (CEES) and 2-chloroethyl phenyl sulfide (CEPS). Both pure ZnO and Pt–ZnO films showed higher response to DMMP than their responses to CEES and CEPS. The simulant response, selectivity, response time and recovery time of the sensors were measured and presented. The role played by surface platinum species in the better simulant sensing performance is discussed.
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Detection of diMethyl Methyl Phosphonate – a simulant of sarin: The highly toxic chemical warfare – using platinum activated nanocrystalline ZnO thick films
Sensors and Actuators B: Chemical, 2012Co-Authors: L.a. Patil, A.r. Bari, M.d. Shinde, V.v. Deo, Mahabir Parshad KaushikAbstract:Abstract Nanocrystalline ZnO powder was prepared using ultrasonic atomization technique. Thick films of this powder were prepared using simple screen printing technique. Pt-modified-ZnO (platinum activated) films were obtained by dipping pure ZnO films into an aqueous solution of chloroplatnic acid for different intervals of time, followed by firing at 500 °C for 30 min. The sensing performance of the unmodified (pure) and Pt-modified ZnO (Pt–ZnO) films was tested on exposure of CWAs (chemical warfare agents) simulants, such as, diMethyl Methyl Phosphonate (DMMP), 2-chloroethyl ethyl sulfide (CEES) and 2-chloroethyl phenyl sulfide (CEPS). Both pure ZnO and Pt–ZnO films showed higher response to DMMP than their responses to CEES and CEPS. The simulant response, selectivity, response time and recovery time of the sensors were measured and presented. The role played by surface platinum species in the better simulant sensing performance is discussed.
V.v. Deo - One of the best experts on this subject based on the ideXlab platform.
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detection of diMethyl Methyl Phosphonate a simulant of sarin the highly toxic chemical warfare using platinum activated nanocrystalline zno thick films
Sensors and Actuators B-chemical, 2012Co-Authors: L.a. Patil, A.r. Bari, M.d. Shinde, V.v. Deo, Mahabir Parshad KaushikAbstract:Abstract Nanocrystalline ZnO powder was prepared using ultrasonic atomization technique. Thick films of this powder were prepared using simple screen printing technique. Pt-modified-ZnO (platinum activated) films were obtained by dipping pure ZnO films into an aqueous solution of chloroplatnic acid for different intervals of time, followed by firing at 500 °C for 30 min. The sensing performance of the unmodified (pure) and Pt-modified ZnO (Pt–ZnO) films was tested on exposure of CWAs (chemical warfare agents) simulants, such as, diMethyl Methyl Phosphonate (DMMP), 2-chloroethyl ethyl sulfide (CEES) and 2-chloroethyl phenyl sulfide (CEPS). Both pure ZnO and Pt–ZnO films showed higher response to DMMP than their responses to CEES and CEPS. The simulant response, selectivity, response time and recovery time of the sensors were measured and presented. The role played by surface platinum species in the better simulant sensing performance is discussed.
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Detection of diMethyl Methyl Phosphonate – a simulant of sarin: The highly toxic chemical warfare – using platinum activated nanocrystalline ZnO thick films
Sensors and Actuators B: Chemical, 2012Co-Authors: L.a. Patil, A.r. Bari, M.d. Shinde, V.v. Deo, Mahabir Parshad KaushikAbstract:Abstract Nanocrystalline ZnO powder was prepared using ultrasonic atomization technique. Thick films of this powder were prepared using simple screen printing technique. Pt-modified-ZnO (platinum activated) films were obtained by dipping pure ZnO films into an aqueous solution of chloroplatnic acid for different intervals of time, followed by firing at 500 °C for 30 min. The sensing performance of the unmodified (pure) and Pt-modified ZnO (Pt–ZnO) films was tested on exposure of CWAs (chemical warfare agents) simulants, such as, diMethyl Methyl Phosphonate (DMMP), 2-chloroethyl ethyl sulfide (CEES) and 2-chloroethyl phenyl sulfide (CEPS). Both pure ZnO and Pt–ZnO films showed higher response to DMMP than their responses to CEES and CEPS. The simulant response, selectivity, response time and recovery time of the sensors were measured and presented. The role played by surface platinum species in the better simulant sensing performance is discussed.
A.r. Bari - One of the best experts on this subject based on the ideXlab platform.
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detection of diMethyl Methyl Phosphonate a simulant of sarin the highly toxic chemical warfare using platinum activated nanocrystalline zno thick films
Sensors and Actuators B-chemical, 2012Co-Authors: L.a. Patil, A.r. Bari, M.d. Shinde, V.v. Deo, Mahabir Parshad KaushikAbstract:Abstract Nanocrystalline ZnO powder was prepared using ultrasonic atomization technique. Thick films of this powder were prepared using simple screen printing technique. Pt-modified-ZnO (platinum activated) films were obtained by dipping pure ZnO films into an aqueous solution of chloroplatnic acid for different intervals of time, followed by firing at 500 °C for 30 min. The sensing performance of the unmodified (pure) and Pt-modified ZnO (Pt–ZnO) films was tested on exposure of CWAs (chemical warfare agents) simulants, such as, diMethyl Methyl Phosphonate (DMMP), 2-chloroethyl ethyl sulfide (CEES) and 2-chloroethyl phenyl sulfide (CEPS). Both pure ZnO and Pt–ZnO films showed higher response to DMMP than their responses to CEES and CEPS. The simulant response, selectivity, response time and recovery time of the sensors were measured and presented. The role played by surface platinum species in the better simulant sensing performance is discussed.
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Detection of diMethyl Methyl Phosphonate – a simulant of sarin: The highly toxic chemical warfare – using platinum activated nanocrystalline ZnO thick films
Sensors and Actuators B: Chemical, 2012Co-Authors: L.a. Patil, A.r. Bari, M.d. Shinde, V.v. Deo, Mahabir Parshad KaushikAbstract:Abstract Nanocrystalline ZnO powder was prepared using ultrasonic atomization technique. Thick films of this powder were prepared using simple screen printing technique. Pt-modified-ZnO (platinum activated) films were obtained by dipping pure ZnO films into an aqueous solution of chloroplatnic acid for different intervals of time, followed by firing at 500 °C for 30 min. The sensing performance of the unmodified (pure) and Pt-modified ZnO (Pt–ZnO) films was tested on exposure of CWAs (chemical warfare agents) simulants, such as, diMethyl Methyl Phosphonate (DMMP), 2-chloroethyl ethyl sulfide (CEES) and 2-chloroethyl phenyl sulfide (CEPS). Both pure ZnO and Pt–ZnO films showed higher response to DMMP than their responses to CEES and CEPS. The simulant response, selectivity, response time and recovery time of the sensors were measured and presented. The role played by surface platinum species in the better simulant sensing performance is discussed.