Anurag Bajpai

Bio: Anurag Bajpai is an academic researcher from Indian Institute of Technology Kanpur. The author has contributed to research in topics: Materials science & High entropy alloys. The author has an hindex of 2, co-authored 6 publications receiving 9 citations.

A new perspective to thermodynamical designing of high entropy bulk metallic glasses (HE-BMGs)

Abstract: The present investigation involves an attempt to incorporate key thermodynamical and topological aspects of glass formation specifically the enthalpy of chemical mixing (ΔHmix), configurational entropy (ΔSconfig) and entropy due atomic size mismatch (ΔSσ) into a single parameter using the PHSS model to understand their role in designing new HE-BMG compositions. The model has been employed with 69 elements for quinary equiatomic alloys to investigate the possibilities of the alloys to form HE-BMGs. The application of the hard-sphere atomic radius in the evaluation of topological parameters through the PHSS model appears to be insufficient in designing new HE-BMG alloy systems due to the limitations of some of the associated assumptions. Most importantly, the effect of the alteration of the local electronic environment of atoms on their atomic radii in multi-component alloys has been incorporated into the model to further establish the defining role of topology in glass formation. The results revealed that the number of quinary equiatomic alloys forming HE-BMG systems is 368,275 (3.75% of 9,818,072 (69C5) total combinations). The modification in atomic radii has been found to pinpoint more precisely the HE-BMG alloy systems when compared to the hard-sphere model for atomic radii of pure elements. In a nutshell, this kind of statistical modelling approach can lead to the development of unprecedented determination of new HE-BMG compositions.

Green Route for Beneficiation of Metallic Materials from Electronic Waste for Selective Reduction of CO2

Abstract: The effective disposal of ever-increasing electronic waste (e-waste) is one of the grand challenges for the scientific and technological community today. As e-waste has exponentially been increasing the burden on our environment with long-term effects on the ecosystem, the need for finding sustainable means to recover, reuse, and recycle the materials available in the e-waste is much sought after in the present time. In this background, we demonstrate an easily scalable green route for the beneficiation and effective usage of metallic materials from the e-waste using cryo-temperature grinding with the primary objective of retrieving the near-full metallic residue from e-waste by an energy-efficient and eco-friendly approach. The metallic nanoparticles thus obtained are subsequently utilized for the selective reduction of CO₂ into different gaseous products via the electrochemical route, leading to the evolution of CH₄, H₂, and CO as major gaseous products at neutral pH and CO as the major product at basic pH. In a nutshell, the current approach can provide useful means for achieving major metallic residue from the e-waste, which can further be utilized for green energy production in an eco-friendly manner, making the process sustainable.

Novel Alloy Design Concepts Enabling Enhanced Mechanical Properties of High Entropy Alloys

Abstract: The emergence of High Entropy Alloys (HEAs) in the world of materials has shifted the alloy design strategy based on a single principal element to the multi-principal elements where compositional space can cover almost the entire span of the higher dimensional phase diagrams. This approach can provide advanced materials with unique properties, including high strength with sufficient ductility and fracture toughness and excellent corrosion and wear resistance for a wide range of temperatures due to the concentrated alloying that cannot be obtained by traditional microalloying based on a single principal element. In addition, the alloy design approach provides new alloy systems in astronomical numbers with variety of microstructural attributes that can yield different properties, and hence conventional trial and error experimental methods for alloy development are redundant. With the help of high throughput experiments along with efficient computational tools, and artificial intelligence, mechanisms based mechanistic development of the multi-principal element alloys with tailored solid solution strengthening, stacking fault energy and microstructure is possible. The current review discusses the various design strategies based on multi-principal elements alloys in semblance with the desired mechanical properties dictated by the micro mechanisms associated with them to overcome the bottlenecks presented by the conventional approaches with possible breakthrough applications. The article will shed light on the current status as well as the future prospects of using these approaches to design novel HEAs.

Structure of Liquids

Abstract: THE Edinburgh discussion of the Faraday Society on September 24-26 on the subject of “The Structure of Liquids and Solutions” was a particularly successful and satisfactory conference. The choice of subject had been very happily timed. The theory of the structure of liquids, which has been in recent years approached from a number of different angles, appears now to have reached a stage in which a larger synthesis is possible, and the bringing together in Edinburgh of many of those who have most notably contributed to these theories has markedly helped towards such a synthesis.

Melanins as Sustainable Resources for Advanced Biotechnological Applications

Abstract: Melanins are a class of biopolymers that are widespread in nature and have diverse origins, chemical compositions, and functions. Their chemical, electrical, optical, and paramagnetic properties offer opportunities for applications in materials science, particularly for medical and technical uses. This review focuses on the application of analytical techniques to study melanins in multidisciplinary contexts with a view to their use as sustainable resources for advanced biotechnological applications, and how these may facilitate the achievement of the United Nations Sustainable Development Goals.