Carbon dioxide gas sensing behavior of nanostructured GdCoO3 prepared by a solution-polymerization method

Michel, Carlos R.; Martínez, Alma H.; Huerta-Villalpando, Fátima; Morán-Lázaro, Juan Pablo

doi:10.1016/j.jallcom.2009.05.003

Cited by 50 publications

(24 citation statements)

References 28 publications

(28 reference statements)

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“…The aqueous solution polymerization method [26] was used to prepare the SDCap. Under a stirring conditions, AM, AMPS and DMC with a mole ratio of 6:1:3 were added into a four-necked flask, wherein the solvent was deionized water.…”

Section: Preparation Of Sdcapmentioning

confidence: 99%

Zwitterionic Polymer P(AM-DMC-AMPS) as a Low-Molecular-Weight Encapsulator in Deepwater Drilling Fluid

et al. 2017

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Featured Application: This work aims to simultaneously realize good encapsulation performance and low-temperature rheological property for deepwater drilling fluid. It is expected to be used in deepwater oil and gas drilling operations. Abstract:In deepwater oil and gas drilling, the high-molecular-weight encapsulator aggravates the thickening of the drilling fluid at low temperatures. Therefore, it is hard to manage the downhole pressure, and drilling fluid loss occurs. In this paper, a zwitterionic polymer P(AM-DMC-AMPS) which was the terpolymer of acrylamide, methacrylatoethyl trimethyl ammonium chloride, and 2-acrylamido-2-methylpropane sulfonic acid, was developed as a low-molecular-weight encapsulator. It was characterized by Fourier transform infrared spectrum analysis, nuclear magnetic resonance, and gel permeation chromatography. Moreover, the low-temperature rheology, shale inhibition and filtration properties of water-based drilling fluids (WBDFs) containing different encapsulators were experimentally investigated and compared. The results showed that the molecular weight of P(AM-DMC-AMPS) was about 260,000, much lower than that of the conventional encapsulators. In the deepwater drilling temperature range 4-75 • C, WBDF containing P(AM-DMC-AMPS) had lower and more stable rheological property because of its short molecular chains. The high shale recovery rate and low swelling rate indicated its strong shale inhibition performance, owing to its adsorption on the clay surface and the wrapping effect through both hydrogen bonding and electrostatic interaction. It also improved the filtration property of WBDF, and was compatible with other WBDF components. This product is expected to simultaneously realize the good encapsulation performance and low-temperature rheological property for deepwater drilling fluid.

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Section: Preparation Of Sdcapmentioning

confidence: 99%

Zwitterionic Polymer P(AM-DMC-AMPS) as a Low-Molecular-Weight Encapsulator in Deepwater Drilling Fluid

et al. 2017

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“…In addition, smaller pores can be observed (with a size of about 0.2 m). This porosity is also attributable to the gases released during thermal decomposition of organic matter, mainly water vapor, NO , and CO 2 [28]. Figure 4 shows a typical EDS-SEM spectrum obtained from the NdCoO 3 powders.…”

Section: Sem Analysis and N 2 Adsorptionmentioning

confidence: 99%

Facile Synthesis, Microstructure, and Gas Sensing Properties of NdCoO₃ Nanoparticles

Gildo-Ortiz

Guillén-Bonilla

Reyes-Gómez

et al. 2017

Journal of Nanomaterials

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NdCoO 3 nanoparticles were successfully synthesized by a simple, inexpensive, and reproducible solution method for gas sensing applications. Cobalt nitrate, neodymium nitrate, and ethylenediamine were used as precursors and distilled water as solvent. The solvent was evaporated later by means of noncontinuous microwave radiation at 290 W. The obtained precursor powders were calcined at 200, 500, 600, and 700 ∘ C in a standard atmosphere. The oxide crystallized in an orthorhombic crystal system with space group Pnma (62) and cell parameters = 5.33Å, = 7.52Å, and = 5.34Å. The nanoparticles showed a diffusional growth to form a network-like structure and porous adsorption configuration. Pellets prepared from NdCoO 3 were tested as gas sensors in atmospheres of carbon monoxide and propane at different temperatures. The oxide nanoparticles were clearly sensitive to changes in gas concentrations (0-300 ppm). The sensitivity increased with increasing concentration of the gases and operating temperatures (25, 100, 200, and 300 ∘ C).

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“…The promising applications of rare earth cobaltites having the general formula Ln 1 -x M x CoO 3 (Ln is a lanthanide and M is a rare earth or alkaline earth metal) in different technological processes and devices [1][2][3], as well as their usage as model materials in the analysis of different physical characteristics, have supported a vivid interest in their studies for more than a half century [4][5][6]. A characteristic feature of cobaltites is the manifestation of multiplicity fluctuations [7] in Co 3+ resulting in the anomalies in their magnetic, electrical, and structural characteristics.…”

Section: Doi: 101134/s0021364016090058mentioning

confidence: 99%

Thermal properties of rare earth cobalt oxides and of La1–x Gd x CoO3 solid solutions

et al. 2016

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Powder X-ray diffraction data for the crystal structure, phase composition, and molar specific heat for La 1 -x Gd x CoO 3 cobaltites in the temperature range of 300-1000 K have been analyzed. The behavior of the volume thermal expansion coefficient in cobaltites with isovalent doping in the temperature range of 100-1000 K is studied. It is found that the β(T) curve exhibits two peaks at some doping levels. The rate of the change in the occupation number for the high-spin state of cobalt ions is calculated for the compounds under study taking into account the spin-orbit interaction. With the Birch-Murnaghan equation of state, it is demonstrated that the low-temperature peak in the thermal expansion shifts with the growth of the pressure toward higher temperatures and at pressure P ~ 7 GPa coincides with the second peak. The similarity in the behavior of the thermal expansion coefficient in the La 1 -x Gd x CoO 3 compounds with the isovalent substitution and the undoped LnCoO 3 compound (Ln is a lanthanide) is considered. For the whole series of rare earth cobalt oxides, the nature of two specific features in the temperature dependence of the specific heat and thermal expansion is revealed and their relation to the occupation number for the high-spin state of cobalt ions and to the insulator-metal transition is established. DOI: 10.1134/S0021364016090058The promising applications of rare earth cobaltites having the general formula Ln 1 -x M x CoO 3 (Ln is a lanthanide and M is a rare earth or alkaline earth metal) in different technological processes and devices [1][2][3], as well as their usage as model materials in the analysis of different physical characteristics, have supported a vivid interest in their studies for more than a half century [4][5][6]. A characteristic feature of cobaltites is the manifestation of multiplicity fluctuations [7] in Co 3+ resulting in the anomalies in their magnetic, electrical, and structural characteristics. Different spin states of cobalt ions are due to the interplay between the interatomic exchange interaction and the crystal field, which depend on external conditions such as temperature and pressure. As a result, cobalt ions can be in the low-spin (LS, S = 0, ), intermediate-spin (IS, S = 1, ), and high-spin (HS, S = 2, ) states. The chemical pressure arising at the partial isovalent or complete substitution of one lanthanide for another in LnCoO 3 compounds can also play the role of external pressure. Such pressure can lead to either the stabilization or destabilization of the lowspin ground state in Co 3+ ions depending on the ionic radius of the substituting chemical element. The thermal expansion coefficients of rare earth cobaltites have an unusual temperature dependence [8][9][10] and can be anomalously large. The additional degrees of freedom related to the multiplicity fluctuations affect also the transport characteristics such as electrical and thermal conductivities and lead to unusually high thermoelectric coefficients of cobaltites [11]. Therefore, the studies o...

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Carbon dioxide gas sensing behavior of nanostructured GdCoO3 prepared by a solution-polymerization method

Cited by 50 publications

References 28 publications

Zwitterionic Polymer P(AM-DMC-AMPS) as a Low-Molecular-Weight Encapsulator in Deepwater Drilling Fluid

Zwitterionic Polymer P(AM-DMC-AMPS) as a Low-Molecular-Weight Encapsulator in Deepwater Drilling Fluid

Facile Synthesis, Microstructure, and Gas Sensing Properties of NdCoO₃ Nanoparticles

Thermal properties of rare earth cobalt oxides and of La1–x Gd x CoO3 solid solutions

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Carbon dioxide gas sensing behavior of nanostructured GdCoO3 prepared by a solution-polymerization method

Cited by 50 publications

References 28 publications

Zwitterionic Polymer P(AM-DMC-AMPS) as a Low-Molecular-Weight Encapsulator in Deepwater Drilling Fluid

Zwitterionic Polymer P(AM-DMC-AMPS) as a Low-Molecular-Weight Encapsulator in Deepwater Drilling Fluid

Facile Synthesis, Microstructure, and Gas Sensing Properties of NdCoO3 Nanoparticles

Thermal properties of rare earth cobalt oxides and of La1–x Gd x CoO3 solid solutions

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Facile Synthesis, Microstructure, and Gas Sensing Properties of NdCoO₃ Nanoparticles