Institution
National Chemical Laboratory
Facility•Pune, Maharashtra, India•
About: National Chemical Laboratory is a facility organization based out in Pune, Maharashtra, India. It is known for research contribution in the topics: Catalysis & Enantioselective synthesis. The organization has 8891 authors who have published 14837 publications receiving 387600 citations.
Topics: Catalysis, Enantioselective synthesis, Nanoparticle, Zeolite, Adsorption
Papers published on a yearly basis
Papers
More filters
••
TL;DR: This work proposes a unique way to make uniform, solution-processable crystalline, and porous COF nanospheres directly from the homogeneous solution of amine and aldehyde via spatial and temporal control of the nu-cleation and growth.
Abstract: Insolubility of covalent organic frameworks (COFs) in organic solvents is one of the major obstacles for the potential application of these extended networks such as drug delivery, sensing, optoelectronics, and semiconductor device fabrication. The present work proposes a unique way to make uniform, solution-processable, crystalline, and porous COF nanospheres directly from the homogeneous solution of amine and aldehyde via spatial and temporal control of the nucleation and growth. This strategy of direct nucleation simultaneously showcases the caliber to tune the size of the COF nanospheres from 25 to 570 nm. We have also demonstrated the concept of mesoscale covalent self-assembly of those solution-processable COF nanospheres in the liquid-liquid interface (DCM-water bilayer) for the very first time, transmuting them into self-standing COF thin films with long-range ordered arrangements in two dimensions. The crystalline and porous (with TpAzo showing highest SBET of 1932 m2 g-1) free-standing COF thin films could be fabricated in a wide range of thicknesses from as low as 21 nm to as high as 630 nm. Both β-ketoenamine (TpAzo, TpDPP) and imine (TpOMeAzo, TpOMeDPP) linked COF thin films have been synthesized via mesoscale covalent self-assembly of the solution-processable COF nanospheres illustrating the generality of this eloquent methodology. Further, the solution processability has been tested and utilized to cast COF thin films uniformly in the inner and outer surface of an alumina hollow fiber membrane. The COF thin film-alumina hollow fiber membrane composites have showcased promising selective molecular separation of He and O2, He and CO2, and He and N2.
132 citations
••
TL;DR: The use of anhydrous urea-hydrogen peroxide adduct as an oxidizing agent in the epoxidation of styrene catalyzed by a titanium-silicate (TS-1) molecular sieve resulted in very high selectivity (∼85%) for styrene oxide as discussed by the authors.
132 citations
••
TL;DR: In this paper, X-ray photoelectron spectroscopy (XPS) was used for the characterization of surface composition of core and shell nanoparticles, and the core-shell nanoparticles were synthesized using sodium bis(2-ethylhexyl) sulfosuccinate (AOT)/n-heptane/water microemulsion technique.
132 citations
••
Abstract: Silver nanoparticles (AgNPs) are currently among the most widely used man-made nanomaterials, present in a huge range of consumer products. Here we report a simple ‘green’ method of AgNP synthesis of using an anionic surfactant without use of any additional reducing agents. It was observed that synthesis of AgNPs at room temperature (25–35 °C) using sodium dodecyl sulphate (SDS) and sunlight. The nanoparticles have been characterised using high-resolution transmission electron spectroscopy (HRTEM), UV–vis spectrophotometry, X-ray photoelectron spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FTIR) and are found to have an average diameter of 30 nm. The nanoparticles are water soluble and the nature of the process is amenable to scaling up.
131 citations
••
TL;DR: In this paper, fluid dynamics of rectangular channels similar to membrane modules and containing different spacers was simulated using a three-dimensional computational fluid dynamics (CFD) model, which provided significant insight into fluid dynamics in spacer filled channels.
131 citations
Authors
Showing all 8913 results
Name | H-index | Papers | Citations |
---|---|---|---|
Ashok Kumar | 151 | 5654 | 164086 |
Rajesh Kumar | 149 | 4439 | 140830 |
Tak W. Mak | 148 | 807 | 94871 |
John T. O'Brien | 121 | 819 | 63242 |
Clive Ballard | 117 | 736 | 61663 |
Yoshinori Tokura | 117 | 858 | 70258 |
John S. Mattick | 116 | 367 | 64315 |
Michael Dean | 107 | 419 | 63335 |
Ian G. McKeith | 107 | 468 | 51954 |
David J. Burn | 100 | 446 | 39120 |
Anil Kumar | 99 | 2124 | 64825 |
Vikas Kumar | 89 | 859 | 39185 |
Detlef W. Bahnemann | 88 | 517 | 48826 |
Gautam R. Desiraju | 88 | 458 | 45301 |
Praveen Kumar | 88 | 1339 | 35718 |