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Study of Properties of Modified Soybean Oil Based Composite Reinforced with Chicken Feather
Gitashree Gogoi,Moon Mandal,Tarun K. Maji 한국섬유공학회 2019 Fibers and polymers Vol.20 No.5
In present days bio-fibers have attracted many researchers in the field of polymer composites due to theiroutstanding properties that nature has conferred on them. In this study, epoxidized soybean oil (ESO) was reacted withmethacrylic acid and then by methacrylic anhydride, along with suitable catalyst to form methacrylic anhydride basedepoxidized soybean oil (MAESO) resin. Chicken feather fibers were used as reinforcing agents in polymer composites due totheir high specific strength and modulus. The ratio of fiber/resin was taken as 30:70. The synthesis of resin was confirmed byfourier transfer infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopy. The interaction between the resin andchicken feather was studied by fourier transform infrared (FTIR) spectroscopy and SEM studies. The thermal stability andmechanical properties of the composites with/without styrene were evaluated using thermogravimetric analyser (TGA) anduniversal testing machine (UTM). Flame retardancy, water vapour uptake, and chemical resistance properties of thecomposites with/without styrene, were also studied.
MADHULEKHA GOGOI,PRITAM DEB 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.4
The magnetic control on scattering of light by ultra¯ne iron oxide (?-Fe2O3) nanoparticles suspended in a carrier liquid was investigated. The light scattering behavior was studied using laser light under the in°uence of a permanent magnet over a rotating frame of reference. When the magnet is rotated continuously from 0? to 360? with respect to the direction of the incident laser beam, the scattered light pattern from the sample has the same angular displacement but in counter direction to the magnetic ¯eld rotation. When external ¯eld is not applied to the ferro°uid, no other preferred directional scattering of light is observed. The applied magnetic ¯eld induces directional self assembly of magnetic nanoparticles through dipole?dipole interactions. This ¯nally leads to the formation of \nanoparticle grating" and the optical geometry of diffraction grating clearly describes the anomalous scattering behavior of the ferro°uid. Most interestingly, for each complete orientation of the ¯eld from 0? to 360?, the transmitted light intensity switches between maxima and minima for longitudinal and transverse applied magnetic ¯elds.
Gayatri Gogoi,Swapnali Hazarika 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.10
−Lignocellulosic biomass, Water hyacinth (Eichornia crassipes) was pretreated with ionic-liquid (IL)-water mixture using ILs, 1-butyl-3-methylimidazolium acetate [BMIM]OAc, 1-butyl-3-methylimidazolium chloride [BMIM]Cl, 1-butyl-3-methylimidazolium bromide [BMIM]Br and 1-butyl-3-methylimidazolium tetrafluoroborate [BMIM]TFB. Effects of IL anions, IL content, temperature, time and particle size of biomass on dissolution and recovery of lignin were examined and the conditions were optimized. Biomass dissolution and yield of lignin recovery in ILwater mixtures with different anions of 1-butyl-3-methyl imidazolium based ILs follows the order, [BMIM]OAc>[BMIM]Cl>[BMIM]Br>[BMIM]TFB. The role of IL-water mixture for dissolution and recovery of lignin was investigated by characterizations using XRD, SEM, FTIR, TGA and XRF spectroscopy. The Hildebrand solubility parameters of biomass component (lignin) and IL-water mixtures were examined using intrinsic viscosity method. On applying the concept of Hildebrand solubility parameter for dissolution of the biomass in all the IL-water mixtures the results were consistent with the experimental results, which suggests that Hildebrand solubility parameter concept can be applied as primary information in choosing the appropriate solvent for biomass dissolution
The effects of SKO on Assam crude oil
Robidas Bondita,Gogoi Subrata Borgohain 한국유변학회 2022 Korea-Australia rheology journal Vol.34 No.2
The energy demand for crude oil (CO) has increased globally which encourages the growth in the petroleum industry worldwide. When CO is transported through a pipeline over long distances, due to the change in environmental circumstances, the fl ow behavior of CO also changes. To improve the flowability of CO through the pipeline, a better understanding of the rheological behavior of CO is very important. In this paper, several experiments were conducted to improve the flowability of CO through pipeline transportation. Dilution of CO with its products like Superior Kerosene Oil (SKO) was selected as it improves the CO flowability through the pipeline and is economically aff ordable. In this study, the effect of SKO on o API gravity, Pour Point, Gel Point, Viscosity Gravity Constant, and rheological parameters were studied for the CO of Upper Assam Basin, Assam. SKO was mixed with CO in diff erent ratios to examine the eff ect of SKO on it. The results obtained showed that with the addition of SKO, o API increases, the minimum limit of attaining paraffi nic nature of CO samples can be determined, heavier CO may not always have high Pour Point and Gel Point. The variation in yield stress of CO with SKO was also observed. Hershel-Buckley Model (HBM) was used and from the three parameters of HBM, the shear-thinning or shear thickening behavior of CO was determined. Therefore, this paper attempts to study the fl ow behavior of CO and also to identify the % of SKO required for improving their fl owability through the pipeline.
Yasmin Raihana,Gogoi Sangeeta,Bora Jumi,Chakraborty Arijit,Dey Susmita,Ghaziri Ghazal,Bhattacharjee Surajit,Singh Laishram Hemchandra 대한암예방학회 2023 Journal of cancer prevention Vol.28 No.3
A category of diseases known as cancer includes abnormal cell development and the ability to infiltrate or spread to other regions of the body, making them a major cause of mortality worldwide. Chemotherapy, radiation, the use of cytotoxic medicines, and surgery are the mainstays of cancer treatment today. Plants or products produced from them hold promise as a source of anti-cancer medications that have fewer adverse effects. Due to the presence of numerous phytochemicals that have been isolated from various parts of the Hibiscus sabdariffa (HS) plant, including anthocyanin, flavonoids, saponins, tannins, polyphenols, organic acids, caffeic acids, citric acids, protocatechuic acid, and others, extracts of this plant have been reported to have anti-cancer effects. These compounds have been shown to reduce cancer cell proliferation, induce apoptosis, and cause cell cycle arrest. They also increase the expression levels of the cell cycle inhibitors (p53, p21, and p27) and the pro-apoptotic proteins (BAD, Bax, caspase 3, caspase 7, caspase 8, and caspase 9). This review highlights various intracellular signalling pathways involved in cancer preventive potential of HS.
Bhushan, Shashi,Gogoi, Mandakini,Bora, Abhispa,Ghosh, Sourav,Barman, Sinchini,Biswas, Tethi,Sudarshan, Mathummal,Thakur, Ashoke Ranjan,Mukherjee, Indranil,Dey, Subrata Kumar,Chaudhuri, Shaon Ray The Korean Society for Microbiology and Biotechnol 2019 한국미생물·생명공학회지 Vol.47 No.2
Earlier studies by our group revealed that gallic acid in phytochemicals stimulated biofilm production in epiphytes, while caffeic acid in phytochemicals inhibited biofilm production in non-epiphytes. It is well documented that antimicrobial secretion by some epiphytic bacteria inhibits non-epiphytic bacterial growth on leaf surfaces. These selection criteria help plants choose their microbial inhabitants. Calcium and iron in phytochemicals also stimulate biofilm formation and thus, may be selection criteria adopted by plants with respect to their native epiphytic population. Furthermore, the processing of leaves during phytochemical extraction impacts the composition of the extract, and therefore its ability to affect bacterial biofilm formation. Computation of the Hurst exponent using biofilm thickness data obtained from the Ellipsometry of Brewster Angle Microscopic (BAM) images is an efficient tool for understanding the impact of phytochemicals on epiphytic and non-epiphytic populations when compared to fluorescent microscopy, scanning electron microscopy, and staining techniques. To the best of our knowledge, this is the first report that uses the Hurst exponent to elucidate the mechanism involved in plant microbe interaction.