Indian Institute of Technology Guwahati

About: Indian Institute of Technology Guwahati is a education organization based out in Guwahati, Assam, India. It is known for research contribution in the topics: Adsorption & Catalysis. The organization has 6933 authors who have published 17102 publications receiving 257351 citations.

Graphene oxide (GO)-interlayered thin-film nanocomposite (TFN) membranes with high solvent resistance for organic solvent nanofiltration (OSN)

Abstract: Organic solvent nanofiltration (OSN) technique provides a broad prospective to protect the environment and save energy, but it faces certain challenges due to the relatively weak tolerance of OSN membranes under very harsh organic solutions and their relatively poor separation performance. A new class of sandwich-like thin-film nanocomposite (TFN) OSN membranes that can cope with these challenges have been fabricated via interfacial polymerization (IP) on porous PI substrate surfaces modified by crosslinked graphene oxide (cGO) nanosheets. The hydrophilicity and roughness of these substrate surfaces, as well as the subsequent IP reaction, were successfully manipulated and optimized by the ultrathin layer of the covalent, immobilized cGO nanosheets. The newly formed TFN OSN membranes possessed an ultra-smooth, hydrophilic, and defect-free polyamide barrier layer with ultralow average roughness (only about 2 nm), ultrathin thickness (about 15 nm), ultrahigh crosslinking degree (about 98.64%), high separation performance (rejection greater than 99.4% for rhodamine B (RDB, 479 Da) and ethanol permeance of 41.47 L m−2 h−1 MPa−1), and superb solvent resistance (rejection higher than 98% for RDB after being immersed in pure DMF at 80 °C for more than 160 days), suggesting their promising potential in the application of organic solution separation and purification.

Advances in mathematical modeling of fluidized bed gasification

Abstract: Gasification is the thermochemical conversion of solid fuel into the gas which contains mainly hydrogen, carbon monoxide, carbon dioxide, methane and nitrogen. In gasification, fluidized bed technology is widely used due to its various advantageous features which include high heat transfer, uniform and controllable temperature and favorable gas–solid contacting. Modeling and simulation of fluidized bed gasification is useful for optimizing the gasifier design and operation with minimal temporal and financial cost. The present work investigates the different modeling approaches applied to the fluidized bed gasification systems. These models are broadly classified as the equilibrium model and the rate based or kinetic model. On the other hand, depending on the description of the hydrodynamic of the bed, fluidized bed models may also be classified as the two-phase flow model, the Euler–Euler model and the Euler–Lagrange model. Mathematical formulation of each of the model mentioned above and their merits and demerits are discussed. Detail reviews of different model used by different researchers with major results obtained by them are presented while the special focus is given on Euler–Euler and Euler–Lagrange CFD models.

Synthesis of a Self‐Assembled Molecular Capsule that Traps Pyridine Molecules by a Combination of Hydrogen Bonding and Copper(II) Coordination

Abstract: Molecule and molecular assemblies with cavities of different size and shape to encapsulate guest molecules have been synthesized in view of their potential use as selective hosts for anion sensing, catalysis, selective recognition, and separation of guest molecules.