Browsing by Author "Manoj Tripathi"

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Economical synthesis of highly efficient and tunable carbon aerogels for enhanced storage of CO2 emitted from energy sources
(John Wiley and Sons Ltd, 2021) Ashish Bhatnagar; Anant Prakash Pandey; M. Sterlin Leo Hudson; Pawan K. Soni; Satish K. Verma; Vivek Shukla; V. Sekkar; Manoj Tripathi; O.N. Srivastava
The present investigation reports the synthesis of Carbon Aerogel (CA) with varying pore size and surface area by changing the initial precursor that is, Resorcinol (R) and novel Catalyst (triethyl amine [TEA]) (C) ratio (R/C). The catalyst, TEA allows the gel to dry with negligible shrinkage. The R/C ratio has been kept 1000, 2000 and 3000. The CA with R/C = 1000 has the lowest pore size 1.93 nm, the highest surface area (369.14 m2/g) and the highest CO2 uptake of 24.40 wt.% (5.54 mmol/) at 40 atm CO2 pressure. The activated version of optimum CA (R/C = 1000) has been found to have an average pore diameter ~ 1.91 nm and CO2 uptake capacity of 29.56 wt% (6.71 mmol/g) at 25°C which is one of the highest CO2 storage capacity of CAs reported so far. Thus, the present manuscript put forward highly efficient and tunable CAs for enhanced CO2 storage. © 2020 John Wiley & Sons Ltd
Glaphene: A Hybridization of 2D Silica Glass and Graphene
(John Wiley and Sons Inc, 2025) Sathvik Ajay Iyengar; Manoj Tripathi; Anchal Srivastava; Abhijit Biswas; Tia Gray; Mauricio M. Terrones; Alan B. Dalton; Marcos A. Pimenta; Róbert Vajtai; Vincent Meunier; Pulickel Madhava Ajayan
2D materials provide ideal platforms for breakthroughs in both fundamental science and practical, real-world applications. Despite the broad diversity of 2D materials, most integration efforts have focused on homo/hetero-structural stacking and Janus structures. In this paper, we introduce “glaphene”—a hybrid of two fundamentally different materials: 2D silica glass and graphene. We propose a metastable hybrid structure based on first-principles calculations, synthesize it via scalable liquid precursor-based vapor-phase growth, and chemically validate the interlayer structure and hybridization using extensive optical and electron spectroscopy, mass spectrometry, and atomic-resolution electron microscopy. Using probe microscopy, we reveal that electronic cloud redistribution at the interface—beyond conventional van der Waals interactions—drives interlayer hybridization via a strong electronic proximity effect. By reconstructing the energy level diagram of glaphene through both theory and experiment, we show that the combination of semi-metallic graphene (Eg≈0 eV) and insulating 2D silica glass (Eg, exp≈8.2 eV, Eg, th≈7 eV) results in a semiconducting “glaphene” (Eg, exp≈3.6 eV, Eg, th≈4 eV) formed through out-of-plane pz hybridization. This work paves the way for scalable, bottom-up methodologies to bring interlayer hybridization and its emergent properties to the 2D materials toolbox. © 2025 The Author(s). Advanced Materials published by Wiley-VCH GmbH.
Waste and biomass-based nanomaterials for CO2 capture
(Elsevier, 2022) Satish Kumar Verma; Abhimanyu Kumar Prajapati; Manoj Tripathi; Ashish Bhatnagar
The world’s countries emit vastly different amounts of heat-trapping gases (greenhouse gases) into the atmosphere. Human activities such as burning fossil fuels for electricity, heat, and transportation are responsible for the increase in greenhouse gases in the atmosphere over the last 150 years. CO2 emissions also result from some industrial and resource extraction processes and the burning of forests during land clearance. In 2020, the top carbon dioxide (CO2) emitters were China, the United States, the European Union, India, the Russian Federation, and Japan. These data include CO2 emissions from fossil fuel combustion, as well as cement manufacturing and gas flaring. Together, these sources represent a large proportion of total global CO2 emissions. The imbalance in atmospheric CO2 concentration caused by emissions from various anthropogenic sources has led to variations in climate across the globe. It has created an urgent demand for developing methods and materials to capture and store CO2 in a cost-effective and environment-friendly way. Many research groups have addressed these issues by continuously finding suitable strategies and developing new methods/materials that will potentially minimize CO2 emissions and eventually contribute to a healthy and sustainable future for the planet. The CO2 capturing requires the use of unique materials that possess inherent superior textural and surface properties or have been suitably functionalized to develop high adsorption capacities. Decades of research have indicated that different materials like activated carbon, metal-organic framework, aerogels, biomass-based nanomaterials (porous carbon), etc., fulfill the required texture and surface properties needed for CO2 capture and can be used as absorbents for CO2. © 2023 Elsevier Inc. All rights reserved.