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Datta, Anindya
- Various Types of Separation Membranes
Abstract Views :315 |
PDF Views:91
Authors
Affiliations
1 National Chemical Laboratory, Dr Homi Bhabha Road, Pune 411 008, IN
2 Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, IN
1 National Chemical Laboratory, Dr Homi Bhabha Road, Pune 411 008, IN
2 Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, IN
Source
Current Science, Vol 110, No 8 (2016), Pagination: 1426-1438Abstract
Membrane-based separation is a superior alternative to conventional processes in many separation problems of practical importance. For maximum effectiveness, both high selectivity and flux are desirable. This article summarizes the global efforts at designing new membrane materials, particularly carbon nanotube (CNT)-based membranes, to achieve the twin objectives mentioned above. Interest in CNT emanates from the excellent transport property of molecules through its frictionless smooth walls, with/without functionalization at the end tips. Permeation of water through graphene oxide (GO) channels, which are otherwise impermeable to solutes, has also generated considerable interest, and GO is being viewed as a promising material for separations. The performances of conducting polymers like polypyrrole, polyaniline, polythiophene-3, 4-ethylenedioxythiophene and their different composites have been studied as a function of changes in morphology and redox behaviour, and this aspect too is covered in the present article. Also, the dependence of the separation performances based on the size, charge and hydrophobic/hydrophilic properties has been discussed in detail. Advances in understanding will have an important bearing on future developments in separation science.Keywords
Carbon Nanotube, Conducting Polymers, Graphene Oxide, Permeability, Flux, Separation Membranes.Full Text
- Accounting for Secondary Inner Filter Effect in Fluorescence Spectra from Solid Samples
Abstract Views :285 |
PDF Views:73
Authors
Affiliations
1 Department of Applied Chemistry, Shri Govindram Seksaria Institute of Technology and Science, Indore 452 003, IN
2 School of Chemical Sciences, National Institute of Science Education and Research Bhubaneswar, Jatni 752 050, IN
3 Department of Chemistry, National Institute of Technology Calicut, Kozhikode 673 601, IN
4 Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, IN
1 Department of Applied Chemistry, Shri Govindram Seksaria Institute of Technology and Science, Indore 452 003, IN
2 School of Chemical Sciences, National Institute of Science Education and Research Bhubaneswar, Jatni 752 050, IN
3 Department of Chemistry, National Institute of Technology Calicut, Kozhikode 673 601, IN
4 Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, IN
Source
Current Science, Vol 114, No 11 (2018), Pagination: 2353-2356Abstract
Fluorescence experiments at high fluorophore concentrations or in solid state have biological relevance and application potential in devices. Inner filter effect, arising from reabsorption of emitted photons, is the simplest of several factors that complicate the emission in these systems. This effect is prominent, especially for systems with small Stokes shift between absorption and emission. Solid state ‘dilution’ of a fluorophore with an optically transparent, non-interfering substance can significantly minimize this effect. This has been shown in the present study, using salophen as a fluorophore and NaCl as the dilutant. The general applicability of this method is tested with three more fluorophores.Keywords
Aggregation-Induced Emission, Inner Filter Effect, Fluorescence Spectroscopy, Solid-State Emitters.Full Text
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