Dr. Syed Arshad Hussain Wellcomes You


PhD thesis submission
August 8, 2012, 1:37 am
Filed under: Layer-by-Layer (LbL) films, layer-by-layer films, Student

Md Nurul Islam submitted his PhD thesis to Tripura University for PhD degree. Mr Islam did his pre-PhD research work in the Thin Film and Nanoscience Laboratory, Department of Physics, Tripura University.

Title of the thesis: Photo physical characterizations of organized molecular assemblies in ultrathin films fabricated by Langmuir-Blodgett (LB) and Layer by Layer (LbL) self assembled (SAM) techniques.

PhD Supervisor: Dr. S. A. Hussain, Asst Professor, Dept. of Physics, TU.

At present Mr Islam is working as Asst Prof. at Govt. Degree college, Tripura.



Ph.D. Award
January 14, 2012, 3:23 pm
Filed under: PhD, Student

My student Mr. Dhananjay Dey has been awarded Ph.D. degree during 9 th convocation of Tripura University held on 12 th January, 2012.



Recent paper from our lab @ Journal of Luminescence

J-aggregates of thiacyanine dye organized in LB films: Effect of irradiation of light

Syed Arshad Hussain E-mail The Corresponding Author, Dibyendu Dey, S.next term Chakraborty  and D. Bhattacharjee

Journal of Luminescence

Volume 131, Issue 8, August 2011, Pages 1655-1660

Abstract

In the present communication we report the preparation and characterizations of Langmuir and Langmuir–Blodgett films of a thiacyanine dye N,N′-dioctadecyl thiacyanineperchlorate (NK) mixed with Octadecyl trimethyl ammonium bromide (OTAB). The relationship between the molar ratio of OTAB and NK and the orientation of molecules at the air–water interface was investigated using surface pressure-area per molecule (π–A) isotherm. UV–vis absorption and fluorescence spectroscopic investigations reveal that prominent J-aggregation of NK molecule was observed in the LB films lifted at higher surface pressure. This J-aggregation can be controlled by diluting the NK molecules with OTAB. It was observed that the J-aggregates of NK decayed to monomer and H-aggregates when the NK-LB film was exposed to a monochromatic light of wavelength 460 nm (λmax of J-aggregates).

Highlights

► Langmuir and Langmuir–Blodgett films of a thiacyanine dye (NK). ► Formation of J-aggregation of NK molecule at higher surface pressures. ► Control of J-aggregates by mixing octadecyl trimethyl ammonium bromide. ► Irradiation of monochromatic light. ► J-aggregates of NK decayed to monomer and H-dimer.

Keywords: Langmuir–Blodgett; π-A isotherm; J-aggregate; Irradiation of light

View at publishers website



New paper @ Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
July 13, 2011, 1:03 pm
Filed under: Lab News, Laboratory news, Langmuir-Blodgett Films, Publications, Student

Adsorption kinetics of a fluorescent dye in a long chain fatty acid matrix
Syed Arshad Hussain, Soma Banik, S. Chakraborty and D. Bhattacharjee
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
Volume 79, Issue 5, September 2011, Pages 1642-1647

Abstract

This work reports the adsorption kinetics of a highly fluorescent laser dye rhodamine B (RhB) in a preformed stearic acid (SA) Langmuir monolayer. The reaction kinetics was studied by surface pressure–time (πt) curve at constant area and in situ fluorescence imaging microscopy (FIM). Increase in surface pressure (at constant area) with time as well as increase in surface coverage of monolayer film at air–water interface provide direct evidence for the interaction. ATR–FTIR spectra also supported the interaction and consequent complexation in the complex films. UV–vis absorption and Fluorescence spectra of the complex Langmuir–Blodgett (LB) films confirm the presence of RhB molecules in the complex films transferred onto solid substrates. The outcome of this work clearly shows successful incorporation of RhB molecules into SA matrix without changing the photophysical characteristics of the dye, thus making the dye material as LB compatible.



		
		


Highlights

► Formation of stearic acid (SA) Langmuir monolayer at air–water interface. ► Injection of fluorescent laser dye rhodamine B (RhB) from the backside of the barrier. ► Monitoring the reaction kinetics by measuring surface pressure–time (πt) curve and in situ fluorescence imaging microscopy (FIM). ► Increase in surface pressure and surface coverage of monolayer film confirm adsorption of RhB onto SA monolayer. ► ATR–FTIR and UV–vis absorption spectra of RhB–SA LB film support the adsorption.

Keywords: Langmuir monolayer; Pressure–area isotherm; Reaction kinetics; FIM; Rhodamine

View at publishers website


Pre-PhD public seminar
September 2, 2010, 4:52 pm
Filed under: Laboratory news, PhD, Student

My student Mr. Dhananjay De has delivered his Pre-PhD public seminar on last 31st August, 2010.

Title of his PhD Theses is: “Spectroscopic Characterizations of  Organized Molecular Assemblies in Ultrathin Films Fabricated by  Layer- by- Layer (LbL) Self Assembled Technique”.

Mr. Dhananjay De is working as Asst. Professor of Physics in Tripura Institute of Technology, Tripura, India.