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Abelev, Esta, et al. Electrochimica acta 53.2 (2007): 1021-1029.
Potassium sorbate plays a pivotal role in enhancing the passivation behavior of copper surfaces during chemical mechanical planarization (CMP), particularly in slurry systems designed for microelectronic fabrication. Recent investigations into its application reveal that potassium sorbate significantly influences copper's electrochemical behavior and repassivation kinetics following mechanical abrasion.
In potassium sorbate-containing sulfate solutions, copper forms a protective passive film comprising Cu₂O, Cu(OH)₂, and Cu(II)-sorbate. Notably, X-ray photoelectron spectroscopy (XPS) confirms that Cu(II)-sorbate is predominantly located at the outermost layer, contributing to enhanced corrosion resistance. The repassivation rates, measured using a slurryjet system capable of detecting single-particle impacts, are in the rapid range of 0.5-1.5 ms-indicating a fast recovery of copper surfaces after mechanical disruption.
Potentiodynamic measurements further demonstrate that increasing potassium sorbate concentration shifts the anodic current onset to more negative potentials and extends the passive range of copper, eliminating breakdown behavior even up to 1.0 VAg/AgCl at higher concentrations. This suggests that potassium sorbate effectively stabilizes the copper passive film under aggressive electrochemical conditions.
These findings support the incorporation of potassium sorbate as a passivating additive in CMP slurry formulations. Its synergistic interaction with oxidizing agents could provide enhanced surface protection, uniformity, and stability essential for advanced semiconductor manufacturing processes.
Cheng, Si, et al. Food Bioscience 61 (2024): 104633.
Potassium sorbate has been successfully employed in the preparation of antimicrobial polyvinyl alcohol (PVA) films, offering promising applications in active food packaging. In a recent study, ternary blend films composed of PVA, potassium sorbate (PS), and metabolites from Bacillus velezensis 906 (906) were fabricated via the solution casting method to harness both mechanical integrity and antibacterial efficacy.
The film-forming solution was optimized at a total solid content of 5% w/v, incorporating 1.0% v/v glycerol as a plasticizer. After ultrasonication to remove air bubbles, the blends were cast and thermally dried. Various mass ratios of PVA, PS, and 906 were explored to tune film properties.
Potassium sorbate played a dual role: as a preservative with intrinsic antimicrobial activity and as a functional additive enhancing the compatibility of bioactive components with the polymer matrix. The inclusion of PS in the PVA/906 blend significantly contributed to the suppression of microbial growth, while maintaining desirable film morphology and mechanical strength.
This innovative formulation demonstrates that potassium sorbate is not only a conventional food preservative but also a valuable additive in bioactive polymeric materials. Its use in PVA-based antimicrobial films opens new avenues in sustainable packaging, offering a synergistic approach to extend food shelf life and ensure microbial safety.
Oliviero, Maria, et al. Materials Chemistry and Physics 310 (2023): 128469.
In this study, potassium sorbate was used to develop a controlled-release antimicrobial system for biodegradable food packaging. The active filler was prepared by intercalating sorbate anions into a layered double hydroxide (LDH) structure using a co-precipitation method. Specifically, 30 mL of potassium sorbate solution (35 mmol) was added to a mixed metal nitrate solution containing Zn(NO₃)₂·6H₂O (43 mmol) and Al(NO₃)₃·9H₂O (22 mmol) under continuous stirring and nitrogen protection. The pH was adjusted to 7.5 using 1 M NaOH, resulting in precipitation of LDH-sorbate. The solid was then filtered, washed with distilled water, and vacuum-dried at 50 °C for 24 h. Elemental analysis confirmed sorbate intercalation at ~18 wt%.
The LDH-sorbate filler was subsequently incorporated into a thermoplastic cellulose acetate (CAT) matrix to form active films via solution casting. Filler loadings up to 5 wt% had minimal impact on film processability. The release kinetics of potassium sorbate from the film were investigated using UV-Vis spectroscopy and analyzed using the Brouers-Sotolongo kinetic model.
The resulting CAT/LDH-sorbate films demonstrated sustained sorbate release and were effective in preserving the quality of fresh pomegranate arils, making this system a promising solution for active and biodegradable food packaging applications.
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