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226 results on '"Goswami, Nirmal"'

25. Ultra-small gold nanoclusters assembled on plasma polymer-modified zeolites: A multifunctional nanohybrid with anti-haemorrhagic and anti-inflammatory properties

Author

González García, Laura E., Ninan, Neethu, Simon, Johanna, Madathiparambil Visalakshan, Rahul, Bright, Richard, Wahono, Satriyo K., Ostrikov, Kostya, Mailänder, Volker, Landfester, Katharina, Goswami, Nirmal, Vasilev, Krasimir, González García, Laura E., Ninan, Neethu, Simon, Johanna, Madathiparambil Visalakshan, Rahul, Bright, Richard, Wahono, Satriyo K., Ostrikov, Kostya, Mailänder, Volker, Landfester, Katharina, Goswami, Nirmal, and Vasilev, Krasimir

Abstract

Hemostatic agents are pivotal for managing clinical and traumatic bleeding during emergency and domestic circumstances. Herein, a novel functional hybrid nanocomposite material consisting of plasma polymer-modified zeolite 13X and ultra-small gold nanoclusters (AuNCs) was fabricated as an efficient hemostatic agent. The surface of zeolite 13X was functionalised with amine groups which served as binding sites for carboxylate terminated AuNCs. Protein corona studies revealed the enhanced adsorption of two proteins, namely, coagulation factors and plasminogen as a result of AuNCs immobilization on the zeolite surface. The immune response studies showed that the hybrid nanocomposites are effective in reducing inflammation, which combined with a greater attachment of vitronectin, may promote wound healing. The hemostatic potential of the nanocomposite could be directly correlated with their immunomodulatory and anti-haemorrhagic properties. Together, the hybrid nanoengineered material developed in this work could provide a new avenue to tackle life-threatening injuries in civilian and other emergencies.

Published
2021

27. Effect of the support composition on catalytic and physicochemical properties of Ni catalysts in oxy-steam reforming of methane

Author

Mierczynski, Paweł, primary, Mosinska, Magdalena, additional, Stepinska, Natalia, additional, Chalupka, Karolina, additional, Nowosielska, Magdalena, additional, Maniukiewicz, Waldemar, additional, Rogowski, Jacek, additional, Goswami, Nirmal, additional, Vasilev, Krasimir, additional, and Szynkowska, Malgorzata I., additional

Published
2021
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29. Ultra-small gold nanoclusters assembled on plasma polymer-modified zeolites: a multifunctional nanohybrid with anti-haemorrhagic and anti-inflammatory properties

Author

González García, Laura E, primary, Ninan, Neethu, additional, Simon, Johanna, additional, Madathiparambil Visalakshan, Rahul Madathiparambil, additional, Wahono, Satriyo Krido, additional, Bright, Richard, additional, Ostrikov, Kostya, additional, Mailaender, Volker, additional, Landfester, Katharina, additional, Goswami, Nirmal, additional, and Vasilev, Krasimir, additional

Published
2021
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45. High-Yield Synthesis of AIE-Type Au22(SG)18Nanoclusters through Precursor Engineering and Its pH-Dependent Size Transformation

Author

Srinivasulu, Yuvasri Genji, Goswami, Nirmal, Yao, Qiaofeng, and Xie, Jianping

Abstract

In recent years, ultrasmall metal nanoclusters (NCs) with aggregation-induced emission (AIE) characteristics have drawn enormous attention due to their strong photoluminescence (PL) and potential applications in many fields, such as bioimaging, diagnostics, therapeutics, and sustainable fuel production. Among all the reported AIE-type metal NCs, the red-emitting Au22(SR)18NCs (where SR is a thiolate ligand) with a precise molecular formula remain as a promising candidate. Common synthetic strategies for Au22(SR)18NCs (e.g., CO-reduction method) not only have relatively low synthesis yield, but also form the byproduct of Au18(SR)14. In addition, the lack of systematic understanding of the reaction mechanism and nontrivial postsynthesis steps greatly hinders its large-scale production. To address these issues, herein, we report a modified CO-reduction protocol to improve the yield of AIE-type Au22NCs in solution. By deconvoluting the original CO-reduction protocol into two stages, the importance of each stage can be studied in detail. By optimizing the key parameters of each stage (e.g., incubation time and temperature), the yield of Au22NCs can be significantly improved (to ∼73%). In addition, we also demonstrated the role of precursors in tailoring the size of the final NC products of the modified CO-reduction protocol. By fine-tuning the incubation time of Stage I and keeping the rest of the protocol unchanged, we can obtain either Au18or Au22NCs as the final product. Moreover, an interesting pH-dependent size transformation from Au22to Au18NCs was also observed regardless of the reaction temperature. The observed synthetic improvement and the postsynthetic size transformation can show impact on the synthesis of other AIE-type metal NCs with different sizes and compositions.

Published
2021
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