Browsing by Author "Abhishek Das"

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Fabrication of hafnium-based nanoparticles and nanostructures using picosecond laser ablation
(Beilstein-Institut Zur Forderung der Chemischen Wissenschaften, 2024) Abhishek Das; Mangababu Akkanaboina; Jagannath Rathod; R. Sai Prasad Goud; Kanaka Ravi Kumar; Raghu C. Reddy; Ratheesh Ravendran; Katia Vutova; S.V.S. Nageswara Rao; Venugopal Rao Soma
This work presents a unique and straightforward method to synthesise hafnium oxide (HfO2) and hafnium carbide (HfC) nanoparticles (NPs) and to fabricate hafnium nanostructures (NSs) on a Hf surface. Ultrafast picosecond laser ablation of the Hf metal target was performed in three different liquid media, namely, deionised water (DW), toluene, and anisole, to fabricate HfO2 and HfC NPs along with Hf NSs. Spherical HfO2 NPs and nanofibres were formed when Hf was ablated in DW. Hf ablated in toluene and anisole demonstrated the formation of core–shell NPs of HfC with a graphitic shell. All NPs exhibited novel optical reflectance properties. Reflectance measurements revealed that the fabricated NPs had a very high and broad optical absorption throughout the UV–vis–NIR range. The NPs synthesised in toluene exhibited the best absorption. The successful fabrication of Hf NSs with the formation of laser-induced periodic surface structures (LIPSS) with low spatial frequency (LSFL) and high spatial frequency (HSFL) orthogonal to each other was also demonstrated. The LSFL and HSFL both exhibited quasi-periodicity. This work presents a simple way to fabricate HfO2 and HfC NPs and provides insight into their morphological and optical characteristics paving way for their applications in future. © 2024 Das et al.; licensee Beilstein-Institut. License and terms: see end of document.
Transposition nasolabial flap: A versatile flap for sensate reconstruction of lip defects
(John Wiley and Sons Inc, 2022) Aseem Mishra; Ravi Shankar; Gautam Prakash; Sudeshna Banerjee; Dipti Daga; Krishna Gopal Birmiwal; Neelesh Tiwari; Monika Gupta; Guru Charan Sahu; Abhishek Das
Introduction: Lip reconstruction aims at maintaining the function and aesthetics of the facial subunits. Sensation in the reconstructed lip helps in bolus formation, tactile discrimination, and thermal sensation. In this study, we aim to describe random pattern nasolabial flap for lip reconstruction using various functional parameters. Methodology: This is a retrospective study of 22 patients with carcinoma lip who underwent surgical resection and reconstruction with sensate nasolabial flap. Several clinicopathological parameters were studied. Outcome parameters like oral competence, tactile sensation, thermal sensitivity of reconstructed lip and speech outcomes were evaluated. Result: A functional outcome with 2–4 mm of two-point discrimination was obtained in 19 patients. All patients had intelligible speech. A mean sulcus depth of 19.59 mm was achieved. One patient had partial flap loss owing to wound infection. Conclusion: Random pattern senate nasolabial flap offers a good functional outcome by maintaining the tactile and thermal sensitivity. © 2022 Wiley Periodicals LLC.