Deltin 7

Journal: Bangladesh Journal of Physics, Publisher: Bangladesh Physical Society

Abstract: Graphene oxide (GO) and its reduced form have recently attracted significant interest due to their outstanding physical and chemical characteristics, hence finding large applications in fields such as electronics and optoelectronics. The paper portrayed herein presents a simple and cost-effective route to obtaining high-quality GO through electrochemical exfoliation methods. The pre-treated Graphite powder was soaked in concentrated sulfuric acid and nitric acid in a 1:1 ratio, followed by washing and neutralization. Thereafter, it was made into paper with the aid of 1% polyethylene. The sheets were suspended in electrolyte solutions of KCl and NaCl at 10.0V, 12.5V, and 15.0V to make sure the swelling of the sheets occurred. Boiling and centrifugation are done for exfoliation and purification. Characterization of GO was performed using FT-IR, FT-Raman, and UV-vis spectroscopy. It will be verified that the voltage and electrolyte type will tune the properties and characteristics of as-prepared GO effectively. The process results in the scale-up and environmentally friendly process for GO production, making the product efficient for applications in so many high-tech industries.

Journal: Bangladesh Journal of Chemical society, 

Abstract: The condensation polymerization of different types of bifunctional monomers containing diacylhydrazine group is performed with different acid chlorides to prepare polyester containing diacylhydrazine moiety as repeating unit. On treating these polymers with sodium hypochlorite solution, they are oxidized and degraded to corresponding dicarboxylic acid with the evolution of N 2 gas. In addition, our synthesized polymer was found to be inert under normal environmental conditions. The synthesized polymers showed high thermal stability. In comparison to polymers with flexible repeating unit, those with rigid repeating unit have higher thermal stability, as demonstrated by the TGA data. The synthesized polymers were found to be insoluble in most of the common solvents.

Islam, A., & Islam, M. S. (2016). Electoral boundary delimitation in Bangladesh: Challenges and options. Bangladesh Political Science Review, Deltin 7 Aviator গেম টাকা ইনকাম of Deltin 7 bangladesh, 12(1), 186–199.

Islam, M. S. (2020). The challenges and strategies of sustainable cities in Bangladesh: A case study on Barishal City Corporation. The Journal of Rural Development, Bangladesh Academy for Rural Development (BARD), 43(1), 125–158.

Islam, M. S. (2020). Electoral politics of minor political parties in Bangladesh: An analysis on voting representation of post-1990 parliamentary elections. Barishal Deltin 7 Aviator গেম টাকা ইনকাম Journal of Social Sciences, 1(1), 157–180.

Islam, M. S. (2020). Connecting budget and policies with sustainable development goals (SDGs): Barishal City Corporation perspectives. The Journal of Rural Development, Bangladesh Academy for Rural Development (BARD), 43(2), 131–171.

Journal: Journal of Bangladesh Chemical Society , Publisher: Bangladesh Chemical Society,

Abstract: Infrared (IR) photodissociation spectra of adenine-thymine (AT +) hetero-dimer cluster has been recorded in the region of 2900-3700 cm-1 in order to investigate the most stable conformer of adenine-thymine hetero-dimer. A new conformer (conformer I) was found which is more stable by 285, 221 and 312 cm-1 than the Watson-Crick conformer (conformer II) at DFT/B3LYP/cc-pVTZ, DFT/M06-2X/cc-pVTZ and DFT/wB97XD/cc-pVTZ levels of theory, respectively. DFT calculated vibration spectra of both conformer I and II shows good agreement with the experimental vibrational spectrum of isolated AT + base pair. According to very high level quantum chemical calculations, it is noticeable that the Watson-Crick conformer of AT base pair is not the most stable conformer in gas phase.

Journal: Journal of Bangladesh Chemical Society, Publisher: Bangladesh Chemical Society 

Abstract: Reducing the head-media spacing is of crucial importance in enabling future high-density magnetic recording. In this work,we have studied the effect of nitrogen incorporation and ultraviolet (UV) irradiation on the interaction between the perfluoropolyether (PFPE) to the carbon surface using quantum chemical method. This paper explores that the UV bonding of PFPE Z-tetraol molecule significantly changes their structural and electronic properties. The results showed that the UV irradiation significantly strengthens bonding of PFPE on carbon surfaces. It is also found that nitrogen incorporation changes the structural and chemical properties of carbon surface and enhanced the bonding between PFPE and carbon surface.

Journal: Bangladesh Journal of Physics, Publisher: Bangladesh Physical Society, 

Abstract:In this work, molecular dynamics (MD) study of triglyme (G3) solution containing lithium bis (trifluoro methyl sulfonyl) amide (Li[TFSA]) were investigated using classical atomistic force fields. G3 is a typical solvent used in non-aqueous Li-air battery. It shows here coordination of Li+ with G3 and [TFSA]- does not significantly change with increasing the concentration of G3 but self-diffusion coefficient of all the ions increases with increasing G3 concentration. The density of [Li(G3)[TFSA] complex decreases with increasing G3 concentration which lead to accelerate diffusivity of ions.