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Jagannath, Jagannath Biswas,Kim, Hyun,Yim, Chai-Suk,Cho, Jungh-Wan,Kim, Geon-Joong,Choe, Soon-Ja,Lee, Dai-Soo The Polymer Society of Korea 2004 Macromolecular Research Vol.12 No.5
We have studied the effects that inorganic zeolite powder have on structurally different copolymer [poly(propylene-co-ethylene)] and terpolymer [poly(propylene-co-ethylene-co-l-butene)] systems and the possibility of preparing suitable porous composite films. The impact strength and yield stress of the composites did not improve upon any further loading of zeolite, but the modulus increased gradually with respect to the filler loading. The experimental modulus of each of the two systems was compared with theoretical models. We performed a morphological study of the filler mixing efficiency and image analysis. The number-, weight-, and z-average air hole diameters were compared with respect to the draw ratio as well as the zeolite loading. The experimental results suggest that these two matrices can provide a new choice for preparing future multiphase polymeric porous films by stretching them unidirectionally. In particular, we suggest that a 40 wt% zeolite loading at a draw ratio of 4 is useful for porous film applications.
The synthesis and applications of TiO2 nanoparticles derived from phytochemical sources
Jagannath Roy 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
Nano sized materials have gathered significant attention during the last few decades due to their uniquechemical, physical, electrical, optical and mechanical properties. Titanium dioxide (TiO2) is non-toxic andhas good corrosion resistance, high chemical and thermal stability. TiO2 has a wide range of applicationsincluding as photocatalysts, in solar cells, self-cleaning surfaces, wastewater treatment and as an antimicrobialagent. A number of methods have been implemented for the synthesis of TiO2 nanoparticles andamong these, so-called ‘green’ approaches, for example those that employ renewable resources and/orrequire low energy input, are attractive because they can be cost-effective, less hazardous and environmentallysustainable. This review explores recent advances in the synthesis of TiO2 nanoparticles derivedfrom phytochemical sources and benchmarks their performance in a range of applications against nano-TiO2 produced by more conventional methods.
Jagannath Mondal,Vishnu Revuri,Piyapong Choochana,Palanivel Ganesan,강우정,이용규 한국약제학회 2020 Journal of Pharmaceutical Investigation Vol.50 No.2
Purpose This article details the application of pristine nitrogen and sulfur doped carbon quantum dots (CQDs) as a novel fluorescence biosensor for the detection of glutathione. The second object of this study is to evaluate reduction of cellular nitric oxide in microglial cells. Methods Microwave assisted hydrothermal method was used for the fabrication of CQDs. Unlike conventional methods which utilize metallic or transition metal coating over CQDs for the fabrication of fluorescence switch on/off probes, our simple yet efficient CQDs itself performed as a biosensor that is both selective and sensitive towards glutathione (GSH). Particle size analyzer, scanning electron microscope, atomic force microscopy, high-performance X-ray photoelectron spectroscopy, fourier-transform infrared spectroscopy were used for physicochemical characterization of developed CQDs. Photoluminescence properties of CQDs were analyzed using photoluminescence spectroscope for glutathione detection. Furthermore, microglial cells were used to evaluate reduction of cellular nitric oxide. Results The developed biosensor was able to detect GSH within a short time of 2 min. Hemolysis assay confirmed negligible red blood cell lysis even at a higher concentration of 0.2 mg/mL. Furthermore, the developed CQDs demonstrated enhanced cellular uptake, which resulted in generating fluorescence from the BV-2 microglial cells. Interestingly, the developed CQDs were able to mitigate the secretion of toxic pro-inflammatory cytokine, nitric oxide (NO) from the lipopolysaccharide (LPS) insulted BV-2 microglial cells. A 50% reduction in the secretion of NO was observed after treating with CQDs in the LPS treated BV-2 cells. Conclusion These novel fluorescent CQDs with low manufacturing costs, high selectivity and sensitivity towards GSH and shorter detection time manifest them as a promising nanomaterial for diverse biomedical applications.