Highly-stable amine-free CsPbBr3 PNCs for display applications
The Department of Chemistry is glad to announce that Dr Nimai Mishra, Assistant Professor, along with his research group comprising PhD scholars, Syed Akhil, Manoj Palabathuni, Subarna Biswas, Rahul Singh, have published an article titled Highly-Stable Amine-Free CsPbBr3 Perovskite Nanocrystals for Perovskite-Based Display Applications in the journal ACS Applied Nano Materials published by the American Chemical Society, having an impact factor of 6.14.
Colloidally synthesised cesium lead halide (CsPbX3; X=Cl, Br, and I) perovskite nanocrystals (PNCs) often suffer from poor ambient and environmental stability conditions, limiting their practical applications. The commonly used surfactant oleylamine is converted to oleylammonium cation, which pulls out the halide anion from the PNCs surface, thus disrupting the nanocrystal’s structural integrity and stability.
The research group has developed a simple, completely amine-free colloidal synthesis with a hot injection method in open-atmospheric conditions and introduced bromooctane as a bromine precursor to overcome the above issues. These, as synthesized amine-free PNCs, showed a photoluminescence quantum yield (PLQY) of around 60 %, and the size of PNCs is ~25 nm. Moreover, these amine-free PNCs were highly stable in the colloidal solution and thin films for more than five months in ambient conditions, with 66% of its initial PLQY.
In addition, these PNCs have shown exceptional stability under different environmental conditions, with 44 % of initial PL even after 6 hours of water treatment and 28 % of initial PL under ethanol treatment for 120 minutes. Furthermore, it has exhibited excellent photostability for 96 hours and retained 36 % of its initial PL under ceaseless UV light irradiation at 365 nm (8 W/cm2). Additionally, these PNCs have good stability upon heat treatment and maintained 34 % of initial PL upon heating up to 90 ºC.
The research team has also successfully fabricated the green-emitting down-conversion LED using these amine-free PNCs. Thus, they visualize that these amine-free CsPbBr3 PNCs are perhaps the ideal candidates for perovskite-based display applications.
- Published in Chemistry-news, Departmental News, News, Research News
Industry project sanctioned to Prof G S Vinod Kumar
The research project titled Development of Novel Gold and Silver Alloys was sanctioned to Prof G S Vinod Kumar from the Department of Mechanical Engineering. The project was sanctioned by Waman Hari Pethe Sons, a leading Gold/Diamond jewellery manufacturing company based in Maharashtra, with a total outlay of Rupees 17 Lakhs. The tenure of the project is two years, from May 2022 to May 2024.
Prof Vinod Kumar’s research interests mainly revolve around the hardening of 22 carats and 24 carats gold for light-weight and high-strength jewellery and the novel processing of light alloy (Al and Mg) foam and studying the structure and properties. He has been intensely involved in the development of technologies for improving the hardness of 22k gold for weight saving and high strength in the cast and hand-made jewellery. This was jointly patented by SRM and Titan. He also has several industrial research partnerships and funded projects to his credit.
The present project aims to develop novel high carat gold (24,22 and 18 carats) for high-strength and light-weight jewellery applications and novel silver alloys (high pure (99%) or sterling silver (92.5%)) having better anti-tarnishing capability. It further aims to develop colour gold alloys (Black, violet and pink gold). The project also involves both the lab-scale and industrial development of the process for scaling up jewellery production of the gold and silver alloys.
- Published in Departmental News, Mechanical Engineering NEWS, News, Research News
Applications of federated learning in computing technologies
The Department of Computer Science and Engineering is delighted to announce that Assistant Professors, Dr Sambit Kumar Mishra and Dr Tapas Kumar Mishra, and the final year BTech students – Kotipalli Sindhu, Mogaparthi Surya Teja, Vutukuri Akhil, Ravella Hari Krishna, and Pakalapati Praveen – published a chapter titled Applications of Federated Learning in Computing Technologies in the scopus-indexed book titled Convergence of Cloud with AI for Big Data Analytics: Foundations and Innovation, a Wiley publication.
The book chapter describes the application of federated learning to various computing technologies. The federated learning concept is similar to the client-server model, where the client sends data to the server for processing and the processed data is again sent to the client. But, in federated learning, the clients are allowed separately to teach the deep neural network models with the local data combined with the deep neural network model at the central server.
Federated learning is a machine learning technique that trains the knowledge across different decentralized devices holding samples of information without exchanging them. The concept is additionally called collaborative learning. Researchers have used large frameworks for all the computations in the past years, and then they have moved to client-server frameworks.
It is also like a traditional centralised machine learning technique. All the local datasets are uploaded to a minimum of one server, so it assumes that local data samples are identically distributed. Because of its security and privacy concerns, it’s widely utilised in many applications like IoT, cloud computing; Edge computing, Vehicular edge computing, and many more. In the chapter, different applications of federated learning, their privacy concerns, and their definition in various fields of computing technologies like IoT, Edge Computing, Cloud Computing, Vehicular edge computing, etc. are presented. It will be of advantage to graduate students, researchers, academicians, institutions, and professionals that are interested in exploring the areas of intelligent computing systems.
- Published in CSE NEWS, Departmental News, News, Research News
Students visit Fopple Drone Tech Pvt Ltd
The Directorate of Entrepreneurship and Innovation had conducted an industry visit to Fopple Drone Tech Pvt Ltd, an innovative start-up aiming to revolutionise agricultural machinery. The industry visit that took place on September 20, 2022 was organised by the student community Industree Owl from the Home of Leaders initiative.The participants had the chance to experience the latest drone technology and its various applications in the agricultural industry.
The learning process is never restricted to purely theoretical bounds but associated as being an exploratory and experiential activity. The startup/industrial visit provided students practical exposure to a startup as well as its challenges and first hand experience of what it takes to be a leader, a startup founder or an entrepreneur.
As a part of their visit, the students participated in a boot camp followed by an intense interaction with the farmer community to identify and understand the grassroot problems and the application of technology as a solution. Later, Shri Gopi Raja, the CEO and founder of Fopple Drone Tech Pvt. Ltd addressed the participants and shared his journey to innovation which made a deep impact on the students.The visit came to fruitful end inspiring courage among students to expand their vision and realise their potential to work in the direction of obtaining Atmanirbhar Bharat.
The industrial visit had intended to design a solution and instil inspiration in students to begin a venture in the same domain. After acquiring necessary perceptive, students have reached out to discuss their project ideas which can be commercialised to utilise in the advancement in the field of agriculture. The visit granted a brilliant and insightful exposure to our students on the cutting-edge technology, the scope and the future of India in the next 5 -10 years.