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Muhibur Rahman, M.
- Polyaniline Based Composite of Non-Covalently Dispersed Multiwalled Carbon Nanotubes for Supercapacitor Electrode
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Authors
Nabila Nabi Nova
1,
Md. Mominul Islam
1,
Saika Ahmed
1,
M. Muhibur Rahman
1,
M. Yousuf A. Mollah
2,
Md. Abu Bin Hasan Susan
1
Affiliations
1 Department of Chemistry, University of Dhaka, Dhaka, BD
2 University Grants Commission of Bangladesh, 29/1 Agargaon, Sher-E-Banglanagar, Dhaka, BD
1 Department of Chemistry, University of Dhaka, Dhaka, BD
2 University Grants Commission of Bangladesh, 29/1 Agargaon, Sher-E-Banglanagar, Dhaka, BD
Source
Journal of Scientific and Technical Research (Sharda University, Noida), Vol 7, No 2 (2017), Pagination: 11-21Abstract
A composite of Multiwalled Carbon Nanotubes (MWCNTs) and polyaniline (PAni) was synthesized by in situ oxidative polymerization of aniline monomers on poly (sodium 4-styrenesulfonate) (PSS) dispersed MWCNTs to produce coaxial structures of MWCNT-PAni composite. The structural, morphological, thermal, surface, and capacitive properties of the composite were analyzed. Scanning electron microscopy images of the composite revealed nanofibrous structure. Infrared spectrum showed slight shifts for several bands of the composite from the bands of PAni to suggest that the MWCNTs have strong attractive interactions with the PAni backbone. The composite was fabricated onto a graphite electrode and the fabricated electrode was characterized using cyclic voltammetry. The fabricated electrode exhibited specific capacitance values of 446 Fg-1, and the value retained 82.5% after 800 cycles. Owing to the good capacitance behavior and cycling stability, the synthesized composite holds promise for energy storage devices like supercapacitors.Keywords
Carbon Nanotube, Non-Covalent Functionalization, Polyaniline, Supercapacitor.
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- Binary Systems of A Hydrophobic Aprotic Ionic Liquid and Water as Catalysts for Michael Addition Reaction
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Authors
Affiliations
1 Department of Chemistry, University of Dhaka, Dhaka, BD
2 University Grants Commission of Bangladesh, Sher-E-Banglanagar, Dhaka, BD
1 Department of Chemistry, University of Dhaka, Dhaka, BD
2 University Grants Commission of Bangladesh, Sher-E-Banglanagar, Dhaka, BD
Source
Journal of Scientific and Technical Research (Sharda University, Noida), Vol 8, No 1 (2018), Pagination: 12-20Abstract
Binary systems of an Aprotic Ionic Liquid (AIL), 8-hexyl-1,8-diazabicyclo[5.4.0]-undec-7-ene-8-iumhydroxide ([C6DBU]OH) and water were prepared at molar ratio, XAIL ranging from 0 to 1.0. Physicochemical properties of the pure and binary systems of the AIL have been studied in detail by viscosity, Fourier Transform Infrared (FTIR) spectroscopy, and dynamic light scattering measurements and thermogravimetric analysis. The negative deviation of excess viscosity at XAIL < 0.4 indicated the formation of micelle like aggregation and the positive deviation of excess viscosity at XAIL > 0.4 indicated the formation of reverse micelle like aggregation due to the surfactant-like behavior of the long alkyl chain in [C6DBU]OH. The spectral and the particle size analyses show the presence of the confined water at XAIL > 0.4 in the cored structure of the reverse micellar aggregates. The variation of the microstructures in water-rich and ionic liquid (IL)-rich region significantly influenced the kinetics of Michael addition reaction between acetylacetone and 2-cyclohexene-1-one in absence of organic solvents while using [C6DBU]OH and its binary systems with water as catalysts. The reaction was studied by using thin layer chromatographic technique using aluminum plates coated with silica gel as the stationary phase and mixture of chloroform and n-hexane (1:1 by volume) as the eluent. The progress of the addition reaction was monitored by observing the development of spots in the chromatographic plate. The kinetic investigations in the presence of 1,8-diazabicyclo[5.4.0]-undec-7-ene (DBU), NaOH, and a DBU based protic IL, [HDBU]OH have also been made and the catalytic performances have been compared. Finally, the role of the [C6DBU]OH and its binary systems with water as catalysts in the mechanism of the Michael addition reaction has been explained in terms of different molecular interactions.Keywords
Aprotic Ionic Liquid, Average Reaction Rate, Catalyst, Micelle, Reverse Micelle, Michael Addition Reaction, 1, 8-Diazabicyclo[5.4.0]-Undec-7-Ene (DBU).References
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- Microstructural Phase Transfer Analysis in Microemulsions and Reverse Micelles of Cetyltrimethylammonium Bromide/1-Butanol/Cyclohexane/Water
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Authors
Affiliations
1 Department of Chemistry, Bangabandhu Sheikh Mujibur Rahman Maritime University, Dhaka, BD
2 Department of Chemistry, University of Dhaka, Dhaka, BD
1 Department of Chemistry, Bangabandhu Sheikh Mujibur Rahman Maritime University, Dhaka, BD
2 Department of Chemistry, University of Dhaka, Dhaka, BD