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601 results on '"Saha, Petr"'

1. Social Implications

Author

Pechancová, Viera, Sáha, Petr, Pavelková, Drahomíra, Passerini, Stefano, editor, Barelli, Linda, editor, Baumann, Manuel, editor, Peters, Jens, editor, and Weil, Marcel, editor

Published
2024
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39. Enhanced Li-ion intercalation kinetics and lattice oxygen stability in single-crystalline Ni-rich Co-poor layered cathodes.

Author

Zhang, Hujun, Qin, Li, Sedlacik, Michal, Saha, Petr, Cheng, Qilin, Yu, Haifeng, and Jiang, Hao

Abstract

Single-crystalline nickel-rich cobalt-poor layered oxides are promising cathode materials for lithium-ion batteries due to their high safety and competitive cost. However, the severe cation disorder and lithium/oxygen (Li/O) loss during the high-temperature calcination process result in slow Li-ion diffusion and inferior O stability. Herein, a LiNi0.85Co0.05Mn0.10O2 (NCM85) single-crystalline cathode was prepared at relatively lower lithiation temperatures by barium/aluminum (Ba/Al) co-doping. The increase in the c-axis caused by Ba doping with a larger ion radius and the reduction in Li/Ni disorder can enhance the Li-ion diffusion kinetics, while the strong Ba–O and Al–O bonds considerably boost the lattice O stability to alleviate O escape during the charging process. The optimized cathode exhibits a high reversible capacity of 206.5 mA h g−1 at 0.1C and 115.6 mA h g−1 at 5C. Impressively, 87.5% of initial capacity is still maintained after 500 cycles at 1C in a pouch-type full cell. This finding provides a viable and flexible method to resolve the kinetics and stability issues of other layered oxide cathodes. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Rheology of polysaccharide based self-cross-linked injectable hydrogel.

Author

Saha, Nabanita, Ngwabebhoh, Fahanwi A., Chaudhuri, Mainak, and Saha, Petr

Subjects
POLYSACCHARIDES, RHEOLOGY, SHEAR (Mechanics), SHEARING force, BIOMEDICAL materials, PECTINS
Abstract

Injectable hydrogel systems are the current interest in health care or medical field for therapeutic agent delivery, disease/cancer therapy, and tissue engineering. On the other hand, polysaccharide-based hydrogels are appealing materials for biomedical applications due to their polyfunctionality, biodegradability as well as originality (origin from nature). Hence, attention has been given in preparation of polysaccharide based injectable hydrogel. But the stability, usability, and application of injectable hydrogel in the biomedical field is determined by rheological properties, which is the most significant features of injectable hydrogels. This article reports about rheological behaviors such as storage (G') and loss modulus (G"), complex viscosity, shear stress and gel point of polysaccharide based injectable hydrogels prepared with oxidized bacterial cellulose, pectin, and chitosan, designated as S-0.5, S-0.75, S-1.0 and S-1.5. They appeared as transparent white, self-crosslinked, and soft polymeric gel with gel formation within less than 30 second possessing depicting viscoelastic properties under oscillatory shear deformation. [ABSTRACT FROM AUTHOR]

Published
2023
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