Workshop on Applied Rheology

Department of Civil Engineering has organised a workshop on Applied Rheology on March 11, 2022, at 10:30 AM (IST). Dr Kartik Pondicherry, Dr Sumit Singh and Dr Kapil Joshi, Application Specialists at Anton Paar, India, will be delivering the keynote addresses.

About this workshop:

Rheology deals with the deformation and flow behaviour of materials. Rheology, in terms of viscosity and viscoelastic behaviour, plays a significant role in many aspects of production, processing, transportation, and consumption of materials and products. The current workshop deals with the basics of rheology with a particular focus on the real-life application of rheology in asphalt, polymers and the food industry.

Speakers:

Dr Kartik Pondicherry pursued his Doctorate in Tribology from the University of Leoben in Leoben, Austria. He started his professional journey at Anton Paar in Graz, Austria. With over a decade of experience in the field of tribology, Dr Pondicherry moved back to India to manage the tribology portfolio in the country. He joined Anton Paar India as a Technical Manager for Rheology. Over the past few years, Dr Pondicherry has conducted numerous seminars and training for people from both academia and industry in different parts of the globe.

Dr Sumit Singh completed his PhD on “Thermal and Rheological study on Polymer modified Bitumen” from IIT Roorkee. After his doctoral studies, he joined the Characterization Division at Anton Paar, India as an Application Specialist. His interest in Rheology lies in its wide range of applications and modularity. Dr Singh is experienced in organising training sessions and webinars. He also conducts lab sessions on various applications of rheology such as polymers, asphalt, DMTA, gels etc. His scientific papers have been presented in numerous National & International forums. He has further received a few academic accolades in his research career.

Dr Kapil Joshi is presently working as an Application Specialist for Rheology & Particle Characterisation in Anton Paar, India. He pursued his doctoral studies in Materials Science in the area of semiconductors & ion beams from the University of Mumbai. After that, he carried out post-doctoral work at the Tata Institute of Fundamental Research (TIFR, Mumbai). His area of research was organic LEDs & solar cells. During his previous engagements, he worked on techniques such as electron microscopy, atomic force microscopy & nanoindentation. In Anton Paar India, he is responsible for analysing samples, delivering talks & conducting training sessions on various aspects of rheology & particle characterisation in the area of polymers, pharma formulations, powders etc.

Convener:

Dr GVP Bhagat Singh, Assistant Professor & Head, Department of Civil Engineering, SRM University-AP, Andhra Pradesh

Co-Conveners:

Dr KVNS Ravi Teja, Assistant Professor, Department of Civil Engineering, SRM University-AP
Dr Thainswemong Choudhury, Assistant Professor, Department of Civil Engineering, SRM University–AP

Register here to join the workshop.

Dr Nimai Mishra, Assistant Professor, Department of Chemistry, SRM University-AP, Andhra Pradesh, along with his research group comprising of students pursuing PhD under his supervision, Ms VG Vasavi Dutt, Mr Syed Akhil, Mr Rahul Singh, and Mr Manoj Paalabathuni have published a research article titled “High-Quality CsPbX3 (X = Cl, Br, or I) Perovskite Nanocrystals Using Ascorbic Acid Post-Treatment: Implications for Light-Emitting Applications” in the Journal “ACS Applied Nano Materials” (published by The American Chemical Society) having an impact factor of ~5.1.

Abstract:

Cesium lead halide perovskite nanocrystals (CsPbX3 PNCs) have been the flourishing area of research in the field of photovoltaic and optoelectronic applications because of their excellent optical and electronic properties. However, they suffer from low stability and deterioration of photoluminescence (PL) properties post-synthesis. One of the ways to minimize the surface defects in the surface treatment with suitable ligands is to achieve the PNCs with superior PL properties for light-emitting applications.

In this article, Dr Mishra’s research group addressed the issue of stability in PNCs. We demonstrate to achieve high photoluminescence and stability of CsPbX3 PNCs by incorporating ascorbic acid via post-treatment as a new capping ligand that is abundantly available. Upon addition of ascorbic acid as surface passivation ligand into the oleic acid/oleylamine system to get near-unity photoluminescence quantum yield (PLQY) of CsPbBr3, CsPb(Br/I)3, and for CsPbI3 perovskite NCs. Maintaining stability has become the hotspot of research in this field. Hence, as-a-proof of concept, the stability studies of PNCs in ambient conditions, under continuous UV irradiation, and PL with temperature variations are put forth here. The stability enhancement with post-treatment of ascorbic acid is highly reproducible as we tested for four batches of samples.

Despite the significant advancements of PNCs, there is a challenge afflicting the stability of CsPbI3 PNCs. They are thermodynamically unstable and undergo a non-perovskite phase (δ-phase) transition at room temperature. Many efforts have been reported in the stabilization of iodide perovskite NCs by critically passivating PNCs and applying them for optoelectronics and photovoltaics. On the other hand, mixed halide perovskites like CsPbBrI2 which are relatively stable than CsPbI3 PNCs are a better choice for device applications. But, photo-induced halide segregation is unavoidable which in turn again limit their usage in practical applications. In this manuscript, we demonstrated that the ultra-stable iodide-based PNCs can be achieved by simple and facile surface treatment with ascorbic acid.

The PL intensity of untreated and ascorbic acid-treated PNCs is recorded for 42 days since the date of synthesis. The measurements are carried out for 4 different batches of samples to ensure reproducibility. It is found that the PL intensity is deteriorating rapidly for untreated PNCs while the PL intensity is largely maintained for ascorbic acid treated PNCs. Nearly ̴72% of the initial PL intensity is maintained even after 42 days for the ascorbic acid-treated CsPbBr3 PNCs while the PL intensity is dropped to 24% for untreated PNCs. Ascorbic acid treated CsPbBrI2 PNCs exhibited exceptional ambient stability where ̴69% of the initial PL intensity is maintained after 42 days while the PL of untreated CsPbBrI2 PNCs is degraded rapidly within 2 weeks from the date of synthesis. Moreover, the PL stability of CsPbI3 PNCs is high for ascorbic acid-treated samples even after 55 days while the PL has deteriorated within 4 days for untreated CsPbI3 PNCs. The PL of untreated CsPbI3 PNCs is completely lost in the first 4 hours of UV illumination while ̴ 76.7% remnant PL is observed for ascorbic acid-treated CsPbI3 PNCs. We believe the stabilization of CsPbX3 PNCs of different halide compositions via simple surface treatment with ascorbic acid could form a basis for futuristic light-emitting applications.

Read the full paper: https://pubs.acs.org/doi/full/10.1021/acsanm.1c04312

Mr Chandra S Bhatt, a PhD Scholar (CSIR-JRF) working under the guidance of Dr Anil K Suresh, Associate Professor, Department of Biological Sciences, has won the Best Oral Presentation Award at the International Conference on “Novel Materials and Technologies for Energy Applications,” organised by BITS Pilani-Hyderabad, on February 18-19, 2022. Prof Ashutosh Sharma, Former DST Secretary & Institute Chair Professor, IIT Kanpur, was the Chief Guest of the Conference.

Abstract:

Mr Bhatt’s project aims to develop the best out of waste, which is practically demonstrated by synthesising gold nanostructured eggshell-based supported catalyst. Besides this novel strategy, the megacatalyst is implemented in the real-time degradations of organic and sewage dyes that are harmful to the environment and hydrogenation of nitroarenes at gram-scale (precursors for various pharmaceutical ingredients). Our rationale, naturally created, stable, reusable, hand-removable, resilient catalyst developed from left-over food waste trounces the majority of the existing challenges while utilising nano-based catalysts for heterogeneous catalysis.

With this innovation, Mr Bhatt aims to demonstrate pilot-scale (100-1000 litre) batch catalytic reactions for real-time textile sewage dye detoxification and gram scale hydrogenation of pharma-precursor for the production of acetaminophen, as a step of validation for immediate technology transfer and commercialisation for both environmental remediation and active pharmaceutical ingredients (API’s).

About the Author:

Mr Bhatt aims to continue his scientific career as a prominent scientist in the interdisciplinary area of nano-immunology for cancer theragnostics. Therefore, after the completion of his PhD, he wishes to advance his research career to contribute further to the realm of science upon postdoctoral training from a top-ranking institution abroad.

“It is indeed a moment of pride for me to be awarded the Best Oral Presentation Award in an International Conference organised by BITS Pilani, Hyderabad, winning over 30 participants across the Nation. I express my heartfelt gratitude to my supervisor Dr Anil K Suresh, for his guidance and motivation me throughout the journey,” said Mr Bhatt.

While expressing his joy, Dr Suresh emphatically said, “This was his first oral presentation in an International Conference, and he was conferred with the “Best Oral Presentation” Award. This recognition speaks for Chandra Sekhar’s dedication to his research. He has been working enthusiastically on this project, and I wish that the paper gets published in a high-impact journal which has already been communicated for Shekar’s bright scientific career.”

Dr Rupesh Kumar

Think Positive, Act Positive and Be Positive has always been the mantra towards mindfulness. Have we ever wondered if there could be a limit to the amount of positivity one can afford? Remain optimistic, but pay attention when you are deluged with toxic positivity. It can turn counterproductive as all other human feelings are swept under the rug. Let all emotions gush through you to awake the real human within.

Ms Liza Hazarika, Student Counsellor, SRM University-AP is organising an exciting and informative session, Dark Side of Positive Vibes to throw light into the different shades of positivity. Learning to look at the brighter side of things is important; it is equally important to not ignore other inevitable impulses that shape up in your mind. Every emotion is meant to be experienced and prevailed over. It is a mixture of anger, fear, pain, envy, and disgust that makes you the real you.

Date: February 19, 2022

Time: 6.30 pm IST

Stay tuned for an illuminating session to enlighten yourselves on the ramifications associated with toxic positivity. Sometimes you can go beyond staying positive to fight your inner demons.

Dr Meenakshi Choudhary

Dr Santanu Kumar Rath

Dr Santanu Rath

Dr Manojkumar V

Dr G Ramakrishnan

Dr Shailendra Kumar