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Synthesis and Charge Transport of Polymer Nanocomposite of Polyaniline: Polystyrene Sulfonate
Biswas, Swarup,Jeong, Hyeon-Seok,Jeong, Jae-Bum,Cho, Boram,Lee, Suwoong,Lee, Dong-Wook,Lang, Philippe,Bae, Jin-Hyuk,Kim, Hyeok American Scientific Publishers 2019 Journal of Nanoscience and Nanotechnology Vol.19 No.8
( Swarup Biswas ),( Yongju Lee ),( Hyeok Kim ) 한국센서학회 2021 센서학회지 Vol.30 No.6
We developed a highly efficient organic photovoltaic (OPV) cell with a poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5- b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)]:[6,6]-phenyl-C71-butyric acid methyl ester active layer for harvesting lower-intensity indoor light energy to power various self-powered sensor systems that require power in the microwatt range. In order to achieve higher power conversion efficiency (PCE), we first optimized the thickness of the active layer of the OPV cell through optical simulations. Next, we fabricated an OPV cell with optimized active layer thickness. The device exhibited a PCE of 12.23%, open circuit voltage of 0.66 V, short-circuit current density of 97.7 μA/㎠, and fill factor of 60.53%. Furthermore, the device showed a maximum power density of 45 μW/㎠, which is suitable for powering a low-power (microwatt range) sensor system.
Development of Mutants of Melanocarpus albomyces for Hyperproduction of Xylanase
Ranjita Biswas,Vikram Sahai,Saroj Mishra,Virendra Swarup Bisaria 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.5
The wild type filamentous fungus, Melanocarpus albomyces, produces many commercially valuable enzymes, including Xylanases and Xylan-debranching enzymes with low activity. In this paper, we report for the first time the development of M. albomyces mutants from vegetative spores. Profuse sporulation of M. albomyces was induced on Potato Carrot Agar medium. These spores,when subjected to chemical mutation, led to the isolation of the hyper-xylanase producing mutant, viz, M. albomyces IITD3A. Various parameters including number of spores,nitrogen source and C/N ratio of the medium were optimized for production of xylanase by the mutant in a shake flask culture. Under controlled pH at 7.8, the mutant produced highly active xylanase with 415 IU/mL after 36h of growth on soluble alkaline lignocellulosic extract in a 14-L fermentor. The overall productivity of xylanase was 8-fold higher than the wild type culture with11,530 IU/L/h. The enzyme can be easily stored at 37oC for 50 days by addition of a small amount of the preservative - thiomersal. Also, for long term storage, a lyophilized powder form of the enzyme can be used which retained 100% of its activity for > 50 days. When assayed at pH 7.5 and temperature 55oC, the xylanase retained 100% of its original activity,and also at pH 9.0, it retained > 50% of its activity for 2 h,which is promising for its application in the pulp and paper industry.
Yongju Lee,Swarup Biswas,Hyeok Kim 한국진공학회(ASCT) 2021 Applied Science and Convergence Technology Vol.30 No.6
The use of tiny, micro-powered electronic devices in indoor environments is increasing daily. The demand for high-performing organic photovoltaics (OPVs) to power these devices has been rapidly growing because OPVs have favorable absorption properties for indoor environments, excellent mechanical flexibility, and other advantageous attributes. Recently, inexpensive, less acidic, and water-processable polyaniline:poly (4-styrenesulfonic acid) (PANI:PSS) was shown to deliver remarkably high performance as the hole transport layer (HTL) in an indoor OPV device with poly(3-hexylthiophene): indene-C60 bisadduct as the active layer. However, PANI:PSS has not been tested in combination with other active materials, although its universal applicability is of key importance for its commercialization. Thus, we tested the potentiality of using PANI:PSS as the HTL of a highly suitable active material, poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b’]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl-l)carbonyl]thieno[3,4-b]thiophendiyl]:phenyl-C70-butyric acid methyl ester (PTB7:PC70BM) in an OPV device under an LED lamp. The results reveal that the OPV device based on the PANI:PSS HTL and PTB7:PC70BM as the active material has high efficiency (11.80%) and a maximum power density of 42.5 W/cm² under a 1,000 lx LED.
Arpan Kumar Mondal,Pankaj Biswas,Swarup Bag 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.1
Submerged arc welding is well-known for its very high deposition rate and thus the capability to join very high thickness metal pieces in large structural applications. Fillet joints are mostly used in structural applications which can be extensively seen in shipbuilding, bridge construction, house buildings, automobile or any other large structures. Thermal stresses generates in a fusion welded joint due to high temperature gradient, which is the cause of the residual stresses upon cooling followed by the angular deformation and failure of the welded structure. As an effect of the thermal gradient, the induced longitudinal, transverse residual stress & angular distortion can vary in single sided and double sided submerged arc welded fillet joints, during designing & manufacturing welded structures which should be taken into account. The main objective of this paper is to quantify the amount of residual stresses and angular deformation in a fillet welding joint. An elasto-plastic thermomechanical model has been developed for predicting residual stresses. A comparison of the residual stress and angular deformation between single and double sided fillet weld joint has been made. The simulation results reveal that the amount of residual stress present in the single sided fillet weld is more and unbalanced in both side of the center of weld line compared to the double sided fillet weld and the predicted results have been matched with the experiments as well as published literatures.