13C and 1H NMR measurements to investigate the kinetics and the mechanism of acetic acid (CH3CO2H) ionization as a model for organic acid dissociation dynamics for polymeric membrane water filtration

Jum’h, Inshad; Telfah, Ahmad; Lambert, Jörg; Gogiashvili, Mikheil; Al-Ta’ani, H.; Hergenröder, Roland

doi:10.1016/j.molliq.2016.11.108

Cited by 14 publications

(5 citation statements)

References 31 publications

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“…With the addition of trace HAc, the 1 H NMR from H 2 O shifted to the downfield direction owing to the decrease of pH value (Figure 2f). [ 29 ] With the increase of TMS contents in the aqueous electrolytes, the 1 H NMR exhibited continuous downfield shift, suggesting the reinforced hydrogen‐bonding between TMS and the aqueous electrolytes (Figure 2f). [ 30 ] Besides, the ATR‐IR spectra for the OH stretching vibration of water molecules (2800–3800 cm −1 ) in different electrolytes showed that the overall peak intensity of OH stretching from H 2 O was gradually reduced along with increasing the TMS content due to the reduction of H 2 O molecules in the reinforced hydrogen‐bonding network (Figure 2g).…”

Section: Resultsmentioning

confidence: 99%

Advanced Buffering Acidic Aqueous Electrolytes for Ultra‐Long Life Aqueous Zinc‐Ion Batteries

Zhao

Zhang

Dong

et al. 2022

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Mild aqueous Zn batteries have attracted increasing attention for energy storage due to the advantages of high safety and low cost; however, the rechargeability of Zn anodes is one major issue for practical applications. In this work, an effective approach is proposed to improve the reversibility and stability of Zn anodes using advanced acidic electrolytes. A trace amount of acetic acid (HAc) is employed as a buffering agent to provide a stable pH environment in aqueous Zn electrolytes, and thus suppress passivation from precipitation reactions on Zn electrodes. Meanwhile, tetramethylene sulfone (TMS) is introduced as the critical component to stabilize the Zn anodes in the acidic electrolyte. TMS greatly strengthens the hydrogen‐bonding network with reduced H2O activity and extends the electrochemical window of acidic electrolytes. With the optimal 3 m Zn(OTF)2 in (H2O‐HAc)/TMS acidic electrolyte (pH 1.6), the Zn electrode exhibits a coulombic efficiency of >99.8% and smooth Zn deposition. The Zn‐V2O5 full cell demonstrates ultra‐stable cycling over 20 000 cycles with a low decay rate of 0.0009% for each cycle at a negative/postive capacity ratio of 6.5. This work provides an insightful perspective to stabilize Zn electrodes by regulating the pH environment and limiting the H2O activity simultaneously for long‐life Zn anodes.

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Section: Resultsmentioning

confidence: 99%

Advanced Buffering Acidic Aqueous Electrolytes for Ultra‐Long Life Aqueous Zinc‐Ion Batteries

Zhao

Zhang

Dong

et al. 2022

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“…CH 3 COO − ions originate from the dissociation of acetic acid (CH 3 COOH) in water [76]. The pH of the solution influences the equilibrium between CH 3 COOH and CH 3 COO − ions.…”

Section: Resultsmentioning

confidence: 99%

Influence of pH on Room-Temperature Synthesis of Zinc Oxide Nanoparticles for Flexible Gas Sensor Applications

Mechai,

Al Shboul,

Bensidhoum

et al. 2024

Chemosensors

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This research contributes to work on synthesizing zinc oxide nanoparticles (ZnO NPs) at room temperature (RT) and their utilization in flexible gas sensors. RT ZnO NP synthesis with a basicity solution (pH ≈ 13) demonstrates an efficient method for synthesizing well-crystalline ZnO NPs (RT.pH13) comparable to those synthesized by the hydrothermal method (hyd.C). The RT.pH13 achieved a high thermal stability with minimal organic reside impurities (~4.2 wt%), 30–80 nm particle size distribution, and a specific surface area (14 m2 g−1). The synthesized pre- and post-calcinated RT.pH13 NPs were then incorporated into flexible sensors for gas sensing applications at ambient conditions (RT and relative humidity of 30–50%). The pre-calcinated ZnO-based sensor (RT.pH13) demonstrated superior sensitivity to styrene and acetic acid and lower sensitivity to dimethyl-6-octenal. The calcinated ZnO-based sensor (RT.pH13.C) exhibited lower sensitivity to styrene and acetic acid, but heightened sensitivity to benzene, acetone, and ethanol. This suggests a correlation between sensitivity and structural transformations following calcination. The investigation of the sensing mechanisms highlighted the role of surface properties in the sensors’ affinity for specific gas molecules and temperature and humidity variations. The study further explored the sensors’ mechanical flexibility, which is crucial for flexible Internet of Things (IoT) applications.

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“…Ionization/deprotonation of the acid groups can depend on the polarity and hydrogen bonding properties of the media. Therefore, to determine the actual DN, we used NMR where the chemical shifts of 1 H NMR or 13 C NMR of ionizable groups can be used to directly measure the DN in mixed solvents. , Preliminary experiments to measure the chemical shifts of MAA groups in S100 using 13 C NMR proved infeasible. At higher water ratios, the S100 precipitated in the mixed solvents, and the relaxation times of MAA groups became too broad to enable quantification.…”

Section: Resultsmentioning

confidence: 99%

Formulation of pH-Responsive Methacrylate-Based Polyelectrolyte-Stabilized Nanoparticles for Applications in Drug Delivery

Kim

Zhang

Armstrong

et al. 2022

ACS Appl. Nano Mater.

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pH-responsive polyelectrolytes, including methacrylate-based anionic copolymers (MACs), are widely used as enteric coatings and matrices in oral drug delivery. Despite their widespread use in these macroscopic applications, the molecular understanding of their use as stabilizers for nanoparticles (NPs) is lacking. Here, we investigate how MACs can be used to create NPs for therapeutic drug delivery and the role of MAC molecular properties on the assembly of NPs via flash nanoprecipitation. The NP size is tuned from 59 to 454 nm by changing the degree of neutralization, ionic strength, total mass concentration, and the core-to-MAC ratio. The NP size is determined by the volume of hydrophilic domains on the surface relative to the volume of hydrophobic domains in the core. We calculate the dimensions of the hydrophobic NP core relative to the thickness of the polyelectrolyte layer over a range of ionizations. Importantly, the results are shown to apply to both high-molecular-weight polymers as core materials and small-molecule drugs. The pH responsiveness of MAC-stabilized NPs is also demonstrated. Future development of polyelectrolyte copolymer-stabilized nanomedicines will benefit from the guiding principles established in this study.

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13C and 1H NMR measurements to investigate the kinetics and the mechanism of acetic acid (CH3CO2H) ionization as a model for organic acid dissociation dynamics for polymeric membrane water filtration

Cited by 14 publications

References 31 publications

Advanced Buffering Acidic Aqueous Electrolytes for Ultra‐Long Life Aqueous Zinc‐Ion Batteries

Advanced Buffering Acidic Aqueous Electrolytes for Ultra‐Long Life Aqueous Zinc‐Ion Batteries

Influence of pH on Room-Temperature Synthesis of Zinc Oxide Nanoparticles for Flexible Gas Sensor Applications

Formulation of pH-Responsive Methacrylate-Based Polyelectrolyte-Stabilized Nanoparticles for Applications in Drug Delivery

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