Filed under: Uncategorized
Dr. Hussain is recieving a Gold medal, cheque of Rs. 20000/-, citation, momento as the Award from Prof. Mihir Deb.
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Dr. Syed Arshad Hussain has been awarded “Sir Jagadish Chandra Bose Award” for the year 2008-09 by State Council for Science & Technology, Govt. of Tripura for his contribution to the field of research & Development.
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- Dr. Hussain is recieving a Gold medal, cheque of Rs. 20000/-, citation, momento as the Award from Prof. Mihir Deb.
Filed under: Uncategorized
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- NK-RhB18 in Langmuir monolayer
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- Fluorescence Microscopic Image of RhB18-NK in Langmuir film
Filed under: Uncategorized
Recently we have prepared organo-clay hybrid films using Layer-by-Layer self assembled technique and Langmuir-Blodgett technique.
Filed under: Layer-by-Layer (LbL) films, Publications, Self Assembled Films, Water-soluble materials, layer-by-layer films | Tags: amaranth, layer-by-layer films, Publications
Title: Preparation and characterization of an anionic dye–polycation molecular films by electrostatic layer-by-layer adsorption process
D. Dey1, S. A. Hussain1, R. K. Nath2 and D. Bhattacharjee1
1. Department of Physics, Tripura University, Suryamaninagar 799130, Tripura, India
2. Department of Chemistry, Tripura University, Suryamaninagar 799130, Tripura, India Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
Abstract:
This communication reports the formation and characterization of self-assembled films of a low molecular weight anionic dye amaranth and polycation poly(allylamine hydrochloride) (PAH) by electrostatic alternating layer-by-layer (LBL) adsorption. It was observed that there was almost no material loss occurred during adsorption process. The UV–vis absorption and fluorescence spectra of amaranth solution reveal that with the increase in amaranth concentration in solution, the aggregated species starts to dominate over the monomeric species. New aggregated band at 600 nm was observed in amaranth–PAH mixture solution absorption spectrum. A new broad low intense band at the longer wavelength region, in the amaranth–PAH mixture solution fluorescence spectrum was observed due to the closer association of amaranth molecule while tagged into the polymer backbone of PAH and consequent formation of aggregates. The broad band system in the 650–750 nm region in the fluorescence spectra of different layered LBL films changes in intensity distribution among various bands within itself, with changing layer number and at 10 bilayer LBL films the longer wavelength band at 710 nm becomes prominent. Existence of dimeric or higher order n-meric species in the LBL films was confirmed by excitation spectroscopic studies. Almost 45 min was required to complete the interaction between amaranth and PAH molecules in the one-bilayer LBL film.
Keywords: Adsorption; Deposition process; Multilayer; Layer-by-layer (LBL) self-assembled films; UV–vis absorption and fluorescence spectroscopy
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Filed under: Uncategorized
One of our paper has been published in the Journal of Luminescence (Elsevier Journal)
Title: Photophysical characterizations of 2-(4-biphenylyl)-5 phenyl-1,3,4-oxadiazole in restricted geometry
P.K. Paula, S.A. Hussaina and D. Bhattacharjee
Journal of Luminescence
Volume 128, Issue 1, January 2008, Pages 41-50
Abstract:
Langmuir and Langmuir–Blodgett (LB) films of non-amphiphilic 2-(4-Biphenylyl)-5-phenyl-1,3,4-oxadiazole (abbreviated as PBD) mixed with stearic acid (SA) as well as with the inert polymer matrix poly(methyl methacrylate) (PMMA) have been studied. Surface pressure versus area per molecule (π–A) isotherm studies suggest that PBD molecules very likely stand vertically on the air–water interface and this arrangement allows the PBD molecules to form stacks and remain sandwiched between SA/PMMA molecules. At lower surface pressure, phase separation between PBD and matrix molecules occurs due to repulsive interaction. However, at higher surface pressure, PBD molecules form aggregates. The UV–vis absorption and steady-state fluorescence spectroscopic studies of the mixed LB films of PBD reveal the nature of the aggregates. H-type aggregate predominates in the mixed LB films, whereas I-type aggregate predominates in the PBD-PMMA spin-coated films. The degree of deformation produced in the electronic levels are largely affected by the film thickness and the surface pressure of lifting.
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Filed under: Atomic Force Micrograph (AFM), Layer-by-Layer (LbL) films, Nanotechnology, Self Assembled Films, Water-soluble materials
Recently we have demonstrated the immobilization of single strand DNA onto a solid support by electrostatic interaction with a polycation poly(allylamine hydrochloride) (PAH). The films were analyzed by UV–vis spectroscopy. We have shown that single stranded DNA gets immobilized on the PAH backbone of Layer-by-Layer (LbL) films when the films are fabricated above the melting temperature of DNA. Singly stranded DNA immobilized in the LbL films is not restored into double stranded DNA at room temperature.
Filed under: Layer-by-Layer (LbL) films, Nanotechnology, Seeing the atom, Self Assembled Films
Filed under: Atomic Force Micrograph (AFM), Fluorescence Resonance Energy Transfer (FRET), Langmuir-Blodgett Films, Nanotechnology
