Reactions Between CO[sub 2] and Tetramethylammonium Hydroxide in Cleaning Solutions

Levitin, Galit; Myneni, Satyanarayana; Hess, Dennis W.

doi:10.1149/1.1583372

Cited by 20 publications

(36 citation statements)

References 18 publications

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“…We hypothesized that the absorption of CO 2 from air into the solution may contribute to the decrease of pH (noting that it has been known that the release of protons from nanosheets after rapid exfoliation also contributes to the decrease of pH). For example, it has been reported that tetramethylammonium hydroxide (TMAOH) can react with CO 2 as a strong base to form tetramethylammonium carbonate . Similarly, TBAOH could react with CO 2 following reaction and serve as a carbon dioxide absorbant: , This reaction consumes hydroxide ions present in solution and introduces some protons.…”

Section: Results and Discussionmentioning

confidence: 99%

Self-Assembly of Metal Oxide Nanosheets at Liquid–Air Interfaces in Colloidal Solutions

et al. 2016

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The oxide nanosheet concentration at the liquid− air interface (LAI) is a key parameter in the formation of Langmuir−Blodgett (LB) deposited nanosheet films. Knowledge of the oxide nanosheet concentration at the LAI as a function of process conditions is needed to understand the relevant processes and achieve better control over the LB fabrication process. In this study, the concentration of Ti 0.87 O 2 δ− titanate nanosheets at the LAI was investigated by considering the trend in the lift-up point (LUP) in the surface pressure−surface area isotherm of an LB compression process as a function of time and exfoliation agent. The oxide nanosheet concentrations in the bulk solutions were studied using UV−vis spectroscopy. The results show that the restacking process in the bulk solution does not significantly retard the occurrence of nanosheets at the LAI. The nanosheet concentration changes in the bulk and at the LAI occur on different time scales. Short exfoliation times yield higher nanosheet concentrations at the LAI than longer exfoliation times, in contrast to the bulk where the nanosheet concentration increases in the course of time. We found the same behavior for other metal oxide nanosheet solutions, i.e., iron-doped titanate (Ti 0.6 Fe 0.4 O 2 0.4− ) and calcium niobate (Ca 2 Nb 3 O 10 − ) nanosheets. The reason behind this phenomenon is likely related to the high degree of adsorption of surfactant molecules on the nanosheet surface after short exfoliation times.

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Section: Results and Discussionmentioning

confidence: 99%

Self-Assembly of Metal Oxide Nanosheets at Liquid–Air Interfaces in Colloidal Solutions

et al. 2016

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“…Upon further CO 2 bubbling, the solution became clear again; this observation has been identified, by titration, as the formation of the bicarbonate salt. 27 However, the carbonate salt was soluble when one part of water was added to four parts of the TMAH solution; this corresponds to 5.8 moles of water per mole of TMAH. When TMAH solution was introduced into CO 2 , the above reactions resulted in the formation of a carbonate, followed by a bicarbonate salt.…”

Section: Resultsmentioning

confidence: 99%

Post-Plasma-Etch Residue Removal Using CO[sub 2]-Based Fluids

Myneni¹,

Hess²

2003

J. Electrochem. Soc.

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A high pressure CO 2 -based post-etch-residue removal method is described. Tetramethylammonium hydroxide ͑TMAH͒ mixtures containing methanol and water were used as cosolvents with CO 2 . The effect of process parameters such as temperature, time, and cosolvent composition on the residue removal was investigated. X-ray photoelectron spectroscopy and scanning electron microscopy were used to characterize the samples. A 12% w/w of a 4:1 volumetric mixture of 25% TMAH in methanol and deionized water in CO 2 at 3000 psi and 70°C was effective in removing the residue; under these conditions, more than one phase was observed in the CO 2 -based mixture. Mechanisms that account for the film and residue removal are proposed.

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“…This agrees with the lack of precipitate found in the experiment and also shows some agreement with the results in the literature. 12 On the basis of these results, the reaction kinetics is subsequently determined as (6) where α refers to the relative conversion of TAMH; R is gas constant, 8.314J/mol/K, and T is temperature, K. This reaction kinetics determines the chemical enhancement of CO 2 -TAMH-TMS-EG, which shows greater enhancement effects than the typical aqueous CO 2 -MEA and CO 2 -MDEA from the standpoint of reaction kinetics. 23 This suggests that TAMH-TMS-EG shows some improvements for CO 2 absorption.…”

Section: ■ Modelmentioning

confidence: 99%

Exploiting an Alternative CO₂ Absorption Process by Efficient Solvent Mixture

Zhang

et al. 2015

Ind. Eng. Chem. Res.

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CO 2 capture greatly helps with greenhouse gas mitigation. Chemical and physical absorption can control CO 2 emission, but these methods are costly. To reduce the cost, an efficient solvent mixture of tetramethylammonium hydroxide (TAMH), tetramethylene sulfone (TMS), and ethylene glycol (EG) is assessed. Gas−liquid equilibrium, reaction kinetics, and mass transfer models are developed and validated by experiments. Henry's constant, reaction kinetics, and mass transfer coefficients between CO 2 and TAMH-TMS-EG are identified. CO 2 loading and mass transfer coefficient are, respectively, obtained as 0.55 mol/molTAMH and 4.02kmol/m 2 /s/kPa, which are on average 25% and 34% higher than the typical MEA process. The theoretical energy consumption amount for desorption of TAMH-TMS-EG-CO 2 solutions is identified as 1.11 GJ/t to 1.34GJ/t. Minimum mass transfer resistance is determined at 40% to 80% TMS fraction. A temperature bulge shift and improvement in the interface characteristics enhance mass transfer due to uniform temperature field and good gas and liquid countercurrent contact.

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Reactions Between CO[sub 2] and Tetramethylammonium Hydroxide in Cleaning Solutions

Cited by 20 publications

References 18 publications

Self-Assembly of Metal Oxide Nanosheets at Liquid–Air Interfaces in Colloidal Solutions

Self-Assembly of Metal Oxide Nanosheets at Liquid–Air Interfaces in Colloidal Solutions

Post-Plasma-Etch Residue Removal Using CO[sub 2]-Based Fluids

Exploiting an Alternative CO₂ Absorption Process by Efficient Solvent Mixture

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Reactions Between CO[sub 2] and Tetramethylammonium Hydroxide in Cleaning Solutions

Cited by 20 publications

References 18 publications

Self-Assembly of Metal Oxide Nanosheets at Liquid–Air Interfaces in Colloidal Solutions

Self-Assembly of Metal Oxide Nanosheets at Liquid–Air Interfaces in Colloidal Solutions

Post-Plasma-Etch Residue Removal Using CO[sub 2]-Based Fluids

Exploiting an Alternative CO2 Absorption Process by Efficient Solvent Mixture

Contact Info

Product

Resources

About

Exploiting an Alternative CO₂ Absorption Process by Efficient Solvent Mixture