Evidence that N2O is a stronger oxidizing agent than O2 for both Ta2O5 and bare Si below 1000°C and temperature for minimum low-K interfacial oxide for high-K dielectric on Si

Lau, W. S.; Qian, Peng; Han, Taejoon; Sandler, N. P.; Che, Songwei; Ang, Shee-Yen; Tung, Chih Hang; Sheng, T. T.

doi:10.1016/j.microrel.2006.05.018

Cited by 10 publications

(14 citation statements)

References 23 publications

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“…It is well documented that N 2 O is a strong oxidizing reagent, similar to hydrogen peroxide, and much stronger than oxygen gas. 30 Thus, the minimization of N 2 O formation during the reaction will be a key factor for the safe preparation of DAZD.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…While venting the gas at the end of the reaction, the methanol vapor and nitrous oxide rushing through the Teflon-lined tubing created optimal conditions to create brush static electricity of sufficient energy to ignite the highly combustible vapor. It is well documented that N 2 O is a strong oxidizing reagent, similar to hydrogen peroxide, and much stronger than oxygen gas . Thus, the minimization of N 2 O formation during the reaction will be a key factor for the safe preparation of DAZD.…”

Section: Results and Discussionmentioning

confidence: 99%

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Development of a Scalable and Safer Synthesis of Diazeniumdiolates

Zhong

Muzzio

Weisel

et al. 2020

Org. Process Res. Dev.

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Although diazeniumdiolates (DAZDs) and the synthetic methods to access DAZDs were discovered over 50 years ago, the current methodology is not safe, has a limited substrate scope, and is not amenable to large-scale production. For example, a recent investigation utilizing the standard methodology to prepare DAZDs resulted in two unexpected explosions, highlighting the need for safer and more practical chemistry. Recently, we have reported a general, scalable, safer, and high-yielding methodology adaptable to large-scale synthesis of diazeniumdiolates in water using a calcium hydroxide base. Herein, we report the full account for the development of the reaction. The merit of this strategy is evidenced by the highly efficient and safer preparation of a key DAZD intermediate, on the kilogram scale, needed for the preparation of MK-8150 (1), a novel O2-alkylated diazeniumdiolate NO donor under investigation as a potent and significant blood-pressure-lowering drug candidate.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Development of a Scalable and Safer Synthesis of Diazeniumdiolates

Zhong

Muzzio

Weisel

et al. 2020

Org. Process Res. Dev.

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“…These were performed for all fluids considered in the core flooding experiments with the exception of N2O which was found to be incompatible with the gravimetric sorption analyser possibly on account of it being a strong oxidizer. 53 All adsorption measurements were conducted at a temperature of 20 °C with pressure decreasing in steps from 100 bar to 0.1 bar. An equilibration time of between 30 and 60 minutes was allowed after a change in pressure.…”

Section: Methodsmentioning

confidence: 99%

Miscible Fluid Displacement in Rock Cores Evaluated with NMRT₂Relaxation Time Measurements

Yang

Connolly

et al. 2020

Ind. Eng. Chem. Res.

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NMR T 2 relaxation times for fluids in a porous medium are, in principle, proportional to the relevant occupied pore size. Here, we exploit this relationship to monitor the pore size distribution occupied by methane (CH 4 ) at 100 bar and room temperature in both sandstone and carbonate rock cores, while it is displaced by a range of miscible fluids: carbon dioxide (CO 2 ), nitrogen (N 2 ), nitrous dioxide (N 2 O), and helium (He). The process is then reversed, with methane being used to displace these injected fluids. Time-resolved T 2 distributions are thus able to probe the preference of the methane for smaller or larger pores during these core-flooding processes. In the cases of CO 2 and N 2 O, methane was found to preferentially occupy larger pores during both injection and displacement for both rock types. In the case of N 2 , no significant preferential pore size occupation was evident, whereas in the case of He, methane preferentially occupied smaller pores. For the fluids used in this work, preferential occupation of comparatively smaller pores during these displacement experiments correlated with a comparatively greater surface adsorption capacity.

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“…The selection of an appropriate ambient during dry thermal oxidation is suggested to be an important factor in affecting the oxide growth rate. Since nitrous oxide gas (N 2 O) is believed to be a stronger oxidizing agent than oxygen [57], utilization of the gas during dry thermal oxidation is expected to improve the oxide growth rate. Besides, the N 2 O gas can be decomposed and formed into nitrogen, oxygen and other related compound [57,58], in which thermal oxidation and nitridation is taking place simultaneously [59].…”

Section: Introductionmentioning

confidence: 99%

“…Since nitrous oxide gas (N 2 O) is believed to be a stronger oxidizing agent than oxygen [57], utilization of the gas during dry thermal oxidation is expected to improve the oxide growth rate. Besides, the N 2 O gas can be decomposed and formed into nitrogen, oxygen and other related compound [57,58], in which thermal oxidation and nitridation is taking place simultaneously [59]. In the second place, the applied N 2 O on the growth of thermally nitrided SiO 2 has been considered as an essential gate oxide for SiC MOS structure.…”

Section: Introductionmentioning

confidence: 99%

Effect of oxidation temperature on physical properties of thermally grown oxide on GaN in N2O ambient

Oon

Cheong

2012

Materials Chemistry and Physics

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Evidence that N2O is a stronger oxidizing agent than O2 for both Ta2O5 and bare Si below 1000°C and temperature for minimum low-K interfacial oxide for high-K dielectric on Si

Cited by 10 publications

References 23 publications

Development of a Scalable and Safer Synthesis of Diazeniumdiolates

Development of a Scalable and Safer Synthesis of Diazeniumdiolates

Miscible Fluid Displacement in Rock Cores Evaluated with NMRT₂Relaxation Time Measurements

Effect of oxidation temperature on physical properties of thermally grown oxide on GaN in N2O ambient

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Evidence that N2O is a stronger oxidizing agent than O2 for both Ta2O5 and bare Si below 1000°C and temperature for minimum low-K interfacial oxide for high-K dielectric on Si

Cited by 10 publications

References 23 publications

Development of a Scalable and Safer Synthesis of Diazeniumdiolates

Development of a Scalable and Safer Synthesis of Diazeniumdiolates

Miscible Fluid Displacement in Rock Cores Evaluated with NMRT2Relaxation Time Measurements

Effect of oxidation temperature on physical properties of thermally grown oxide on GaN in N2O ambient

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Miscible Fluid Displacement in Rock Cores Evaluated with NMRT₂Relaxation Time Measurements