Browsing by Author "Shweta"
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Publication Doping impacts of La2O3 on physical, structural, optical and radiation shielding properties of (30-x)BaCO3-30TiO2-40SiO2-xLa2O3 (0 ? x ? 6) glasses for optoelectronic applications(Institute of Physics, 2023) Mishra, Rajat Kumar; Kumari, Savita; Shweta; Sen, Prince; Avinashi, Sarvesh Kumar; Fatima, Zaireen; Thomas, Harel; Ghosh, Manasi; Dey, Krishna Kishor; Gautam, ChandkiramHerein, synthesis of novel barium silicate glasses doped with La2O3 in the system (30-x)BaCO3-30TiO2-40SiO2-xLa2O3, BTSL (0 ? x ? 6) via fast melt-quenching technique was carried out. Further, to confirm the amorphous behaviour of prepared glass samples, x-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) were carried out. The density of all prepared glasses was determined using Archimedes� principle and found to be in an increasing manner. To investigate the doping influence of La2O3 on the glasses, few more physical properties like molar volume (Vm), polaron radius (rp), and field strength (Fs) were also studied and found to be increased due to incorporation of La2O3 into BTSL glassy system. Moreover, to explore the structural, functional, and bonding mechanism of the glasses, FTIR, Raman and 29Si-MAS-ssNMR spectroscopies were performed. Further, to investigate the numerous optical parameters, UV-visible spectroscopy was executed, and energy band gaps were found in the decreasing manner as increasing the La2O3 concentrations. Additionally, to study the optoelectronic properties, refractive indices (?) and optical dielectric constant (?) were determined and revealed the increasing behaviour and found suitable material for optoelectronic devices. Furthermore, the radiation shielding parameters, mass attenuation coefficient (MAC), linear attenuation coefficient (LAC), etc were determined using Phy-X/PSD software and these parameters are increased owing to the doping of La2O3. Among all fabricated glasses, (30-x)BaCO3-30TiO2?40SiO2?6La2O3, BTS6L glass exhibited outstanding optical and radiation attenuation properties; can be tailored for the fabrication of optoelectronic and radiation protection devices. � 2023 IOP Publishing Ltd.Item Drosophila glial system: an approach towards understanding molecular complexity of neurodegenerative diseases(Springer Science and Business Media B.V., 2024) Shweta; Sharma K.; Shakarad M.; Agrawal N.; Maurya S.K.Glia is pivotal in regulating neuronal stem cell proliferation, functioning, and nervous system homeostasis, significantly influencing neuronal health and disorders. Dysfunction in glial activity is a key factor in the development and progression of brain pathology. However, a deeper understanding of the intricate nature of glial cells and their diverse role in neurological disorders is still required. To this end, we conducted data mining to retrieve literature from PubMed and Google Scholar using the keywords: glia, Drosophila, neurodegeneration, and mammals. The retrieved literature was manually screened and used to comprehensively understand and present the different glial types in Drosophila, i.e., perineurial, subperineurial, cortex, astrocyte-like and ensheathing glia, their relevance with mammalian counterparts, mainly microglia and astrocytes, and their potential to reveal complex neuron-glial molecular networks in managing neurodegenerative processes. � The Author(s), under exclusive licence to Springer Nature B.V. 2024.Item Evolution of shock waves in dusty nonideal gas flow with magnetic field(Walter de Gruyter GmbH, 2024) Shweta; Pradeep; Srivastava S.K.; Singh L.P.This paper deals with the study of propagation of shock waves in 2-D steady supersonic magnetogasdynamics flow of nonideal dusty gas using wavefront analysis method. We derived the transport equation, which determines the condition for the shock formation. Our aim is to analyze the effect of interaction of dust particles with magnetic field in nonideal gas on the evolution of shock formation and to examine how the flow patterns of the disturbance vary with respect to the variations in the physical parameters of the medium. It is found that the presence of magnetic field plays an essential role in the wave propagation phenomena. The nature of the solution with respect to the Mach number is analyzed, and it is examined how the shock formation distance changes with an increase or decrease in the value of Mach number. Also, the combined effect of nonidealness, magnetic field, and dust particles on the shock formation distance is elucidated and examined how the formation of shocks is affected by the increase in the value of corresponding physical parameters. � 2024 Walter de Gruyter GmbH, Berlin/Boston.Publication Evolution of weak discontinuity waves in non-ideal interstellar environments(Springer, 2023) Shweta; Chaturvedi, Rahul Kumar; Srivastava, Shobhit Kumar; Singh, L.P.A systematic method is used to study the problem of propagation of planar, cylindrically symmetric and spherically symmetric shock waves of the one-dimensional motion of an inviscid, self-gravitating, non-ideal interstellar gas cloud. The analytic solution of the problem is resolved, which specifies non-linear behavior in the physical plane. The transport equation, which describes the evolution of weak discontinuity in non-ideal gas is derived. It is observed that the nature of the solution completely depends on the net volumetric cooling rate and self-gravitating parameter. It is observed that an increase in the value of self-gravitating parameter results in delay of process of shock formation and shock forms early when heating dominates cooling in the system. Also, expansive waves take less time to decay in planar geometry as compared to cylindrical and spherical geometries and compressive waves take more time to develop shocks for cylindrical and spherical geometries as compared to planar geometry. � 2023, Indian Academy of Sciences.Item Fabrication of bioactive transparent glass ceramics 55SiO2�25Na2O-(15-x)CaO�5P2O5- xZrO2 (0?x?6): Physical, structural and in vitro cell viability insights for biomedical applications(Elsevier Ltd, 2024) Shweta; Mishra R.K.; Pradhan B.L.; Parveen S.; Behera P.; Avinashi S.K.; Kumari S.; Fatima Z.; Sen P.; Kumar S.; Mishra M.; Banerjee M.; Dey K.K.; Ghosh M.; Gautam C.Zirconia (ZrO2) reinforced transparent glass ceramics (TGCs) are excellent materials for enhanced cell viability and biocompatibility for biomedical applications. Herein, ZrO2 doped SiO2�Na2O�CaO�P2O5 base compositions derived from traditional melt-quench technique. The impacts of ZrO2 on the physical, structural, optical, morphological, and biological evaluation were studied. XRD discloses the major phase formation of buchwaldite (CaNaPO4) and disodium calcium silicate (Na2CaSiO4). Density of the TGC samples was calculated and found to be in the range of 2.535�2.910 g/cm3. The optical parameters, and particle size were estimated and analyzed. Herein, ZrO2 plays a significant role as a network modifier and various bond assignments in the glassy network that confirmed by FTIR spectroscopy. Surface morphology and its elemental investigations were also studied using SEM and XPS techniques. Solid state NMR spectrum on 23Na, 29Si, and 31P nucleus were studied for various interactions. Moreover, the cell viability of the fabricated samples on the cancer cells were analyzed and resulted to possess the half maximum inhibitory concentrations (IC50) of the samples were calculated and valued to be 92 to 40 ?g/ml respectively. The sample 55SiO2�25Na2O�9CaO�5P2O5�6ZrO2 (BG4) demonstrated a remarkable biological activity for bone regeneration and implants. Further, the cell cytotoxicity was evaluated by performing trypan blue assay, DAPI and DCFH-DA staining on the TGC samples. The data assembled in this research approves the hypothesis that the TGCs represent a feasible material for the biomedical applications for bone and tooth implants. � 2024 Elsevier Ltd and Techna Group S.r.l.Publication Influence of carbon nanotubes reinforcement on the structural feature and bioactivity of SiO2�Al2O3�MgO�K2CO3�CaO�MgF2 bioglass(Springer Science and Business Media Deutschland GmbH, 2021) Shweta; Gautam, Chandkiram; Dey, Krishna Kishor; Ghosh, Manasi; Prakash, Ravi; Sharma, Kriti; Singh, DivyaVarious glass compositions were synthesized using a melt-quenching technique doped with different concentrations of carbon nanotubes (CNTs) from 0.1 to 0.7% in the glassy system SiO2�Al2O3�MgO�K2CO3�CaO�MgF2. Density was determined by employing a liquid displacement method. Several physical parameters such as molar volume (Vm), oxygen molar volume (Vo) were calculated and found to be decreases from 36.49 � 0.729 to 24.28 � 0.485 � 10�6�m3/mol, and 21.86 � 0.437 to 14.60 � 0.292 � 10�6�m3/mol, respectively. However, density and oxygen packing density (OPD) increases from 1.99 � 0.099 to 2.98 � 0.149 � 103�kg/m3 and 45.74 � 0.914 to 68.49 � 1.369 � 10�3�kg-atom/l with increasing content of CNT. In the present study, reinforcement effects of CNTs were explained using several spectroscopic techniques like Fourier transform infrared, ultraviolet�visible (UV�Vis), Raman, and nuclear magnetic resonance (NMR) spectroscopy, respectively. Based on Tauc plots of the UV�Vis spectra, the energy band gap was determined and their values decreased from 6.95 to 6.23 � 10�19�J which is owing to the formation of non-bridging oxygen (NBO) in the glassy matrix. Contact angle measurements were also performed to check the wettability of the glasses and their values increased with CNT % from 18.14� to 77.8�. 29Si-MAS-NMR spectroscopic study revealed the random distribution of two different cations, Ca 2 + and Mg 2 + within the glasses which lead to structural and topological frustration. To check the cell viability, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide�and alkaline phosphatase assay were also performed. Owing to outstanding stability in various fluids like saline water, distilled water, and hydrochloric acid, the fabricated glasses exhibited functional activities with an adequate proliferation of rat calverail osteoblast cells. Consequently, based on the various characterization techniques such as mechanical, tribological, and biological activities, the fabricated bioactive glasses can be used for biomedical and multifunctional applications. � 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.Item Lignocellulolytic enzymes: Potential biocatalysts to pre-treat lignocellulosic biomass for its biotechnological and industrial applications(Nova Science Publishers, Inc., 2024) Malhotra M.; Mittal K.; Yadav V.K.; Maurya V.; Shweta; Kumar A.Lignocellulosic biomass, otherwise considered waste from agricultural and forest areas, has found its potential application in various sectors such as biomedical, cosmeceutical, pharmaceutical sectors, etc. Moreover, they can be utilized to produce bioplastic and can be used as a sustainable alternative for energy production. However, the lignin content present in the lignocellulosic biomass poses a hindrance in its complete utilization. Therefore, to delignify the lignocellulosic biomass, traditionally, various physical and chemical pre-treatment methods have been introduced, which again are not only expensive but also prove to be hazardous for the environment as the chemical treatment of the lignocellulosic biomass may result in harmful end products. Hence, to eliminate these problems, research has now been focused on utilizing biological methods to delignify and detoxify the lignocellulosic biomass which includes various lignocellulosic enzymes such as laccase, lignin peroxidase, manganese peroxidase, and versatile peroxidase for its pretreatment. This chapter, therefore, aims to summarize the introduction of various lignocellulosic enzymes and their potential role in the pretreatment of the lignocellulosic biomass, in order to make the biomass applicable for various biotechnological and industrial applications as well as for the production of bioethanol. � 2024 Nova Science Publishers, Inc. All rights reserved.Publication Physical, Structural, and Optical Properties of ZrO2 Reinforced (100-x�y)[SrTiO3]-x[2B2O3.SiO2]-y[ZrO2] Glasses(Springer Science and Business Media B.V., 2023) Mishra, Rajat Kumar; Shweta; Sen, Prince; Dey, Krishna Kishor; Ghosh, Manasi; Gautam, ChandkiramSeveral attempts were made to fabricate zirconia (ZrO2) reinforced strontium titanate (SrTiO3) borosilicate glasses in the system (100-x�y)[SrTiO3]-x[2B2O3.SiO2]-y[ZrO2] (38 ? x ? 39, 0 ? y ? 4 by mole %) via a rapid melt-quenching method. To check the amorphous behaviour of the prepared glasses, XRD measurements were performed. Further, density of the bulk transparent glasses was evaluated by liquid-displacement method (Archimedes� principle) and found to be in the range of 2.6068�3.0720 gcm?3. To study the effect of ZrO2 doping on the fabricated glasses, various physical parameters such as oxygen molar volume (Omv), molar volume (Vm), oxygen packing density (OPD), ion-concentrations (N), etc. were determined. Further, to investigate the molecular structure, and bonding information, FTIR spectroscopy was performed. Additionally, to determine the various optical properties, the UV�visible spectroscopy was also performed, and with the help of Davis-Mott plots, increasing optical band gap energies were obtained in the range of 4.29�4.78�eV. Besides these parameters, an optical dielectric constant (?), and average refractive index (?) were determined which lies within the increasing range of 120.0374�207.3341 and 1.9269�2.0690 respectively. Moreover, to elaborate the structure of the fabricated glasses, 29Si and 11B MAS SSNMR spectra were recorded which shows the formation of silicate networks which became highly polymerized with increasing concentrations of ZrO2. � 2023, The Author(s), under exclusive licence to Springer Nature B.V.Item Saccharomyces cerevisiae: A yeast cell factory for the production of biofuel from agricultural wastes(Nova Science Publishers, Inc., 2024) Yadav V.K.; Maurya V.; Malhotra M.; Mittal K.; Shweta; Kumar A.The dependency of human beings on fossil fuels is increasing gradually. The burning of fossil fuels (non-renewable sources of energy) releases greenhouse gases that cause environmental pollution and contributes to climate change. Therefore, biofuel can act as an alternative to fossil fuels, as it is a renewable source of energy, and its combustion does not produce greenhouse gases. The most prevalent biofuel is bioethanol, which is produced through fermentation with the help of the yeast Saccharomyces cerevisiae. Due to metabolic engineering, the yeast Saccharomyces cerevisiae can currently produce a variety of sophisticated biofuels. Based on the raw material used in fermentation to produce biofuel, it can be categorized as first-generation (traditional feedstock), secondgeneration (lignocellulosic biomass), third-generation, or advanced biofuel (algal biomass). Agricultural wastes like wheat straw, sugarcane bagasse, and rice, are rich sources of cellulose that can be utilized as raw material to produce biofuels. Different kinds of agricultural waste that can be used to produce bioethanol (biofuel), with yeast-mediated fermentation are discussed in this chapter. � 2024 Nova Science Publishers, Inc. All rights reserved.Publication Shock wave solution for the planar, cylindrically, and spherically symmetric flows of non-ideal relaxing gas(Elsevier B.V., 2022) Shweta; Chaturvedi, Rahul Kumar; Singh, L.P.In the present article, we investigate one-dimensional non-ideal relaxing gas to study solution of shocks for planar and non-planar flows, more specifically cylindrically symmetric, and spherically symmetric flows. The analytic solution of the problem is determined in the characteristic plane. It signifies that linear solution in this plane reveals non-linear behavior in the physical plane. Also, the condition of shock formation has been determined by analyzing the growth and deterioration of shocks using transport equations. It is observed that nature of the solution completely depends upon relaxing gas parameters and non-idealness. All computations are done using computational package MATHEMATICA. � 2022 The Physical Society of the Republic of China (Taiwan)Item Synergetic impact of MgO on PMMA-ZrO2 hybrid composites: Evaluation of structural, morphological and improved mechanical behavior for dental applications(Elsevier Inc., 2024) Kumari S.; Verma A.; Mishra R.K.; Avinashi S.K.; Shweta; Singh S.; Behera P.; Rao J.; Gautam R.K.; Pradhan B.L.; Dey K.K.; Ghosh M.; Mishra M.; Gautam C.This work aims to demonstrate the effect of ZrO2 and MgO inclusion into the Poly(methyl methacrylate) (PMMA). To fabricate novel hybrid composites via heat cure method, various composites (PZM2, PZM4 and PZM6) were synthesized in the system [(95-x) PMMA + 5 ZrO2 + x MgO] (x = 2, 4, and 6) respectively. Density of the prepared composites were determined and varying between 1.035�1.152 g/cm3. X-ray Diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) followed by EDAX and mechanical testing were performed to evaluate the fabricated composite properties. Moreover, to explore the structure of the fabricated composites the 13 C CP-MAS SSNMR and 1 H-13 C Phase-Modulated Lee Goldberg (PMLG) HETCOR Spectrum were recorded which clarify chemical shifting and motional dynamics of the composites. Mechanical tests were performed by UTM and the obtained parameters such as compressive strength, Young's modulus, fracture toughness, brittleness coefficient, flexural strength and flexural modulus are found to be in the range of 91�100 MPa, 0.48�0.51 GPa, 9.122�9.705 MPa.m1/2, 0.66�0.815, 51.03�42.78 MPa and 499�663 MPa respectively. Some more mechanical parameters such as proportional limit, elastic limit, failure strength, modulus of resilience and modulus of toughness were also calculated. Furthermore, tribological properties were also determined and the coefficient of friction (COF) was decreased by 17.4 % and 38 % for composite PZM6 at 20 N and 40 N as compared to the composite PZM2 and the lowest wear volume of 1.55 mm3 was observed for PZM2, whereas the maximum volume loss of 5.64 mm3 is observed for composite PZM6. To check out the biocompatibility, cytotoxicity and genotoxicity of the fabricated composites the Trypan-blue assay was also performed for PZM2 and PZM6 composites. Dissection on the gut of larvae was also performed on the both composites followed by DAPI and DCFH-DA staining. Therefore, these synthesized samples can be used for the fabrication of denture materials. � 2024 Elsevier Inc.Item Synergistic doping effect of La2O3 on BaO-TiO2-SiO2 glass-ceramics: Evolution of physical, structural, morphological, and dielectric behaviour for electronics applications(Elsevier Ltd, 2024) Mishra R.K.; Avinashi S.K.; Kumari S.; Shweta; Nain R.; Katheriya T.; Dwivedi R.K.; Upadhyay S.; Gautam C.Herein, numerous investigations such as structural, physical, morphological, optical, and dielectric properties of BaO-TiO2-SiO2 glass-ceramics (GCs) doped with La2O3 were carried out. Various glasses were synthesized within a glass system [(30-x)BaO.30TiO2.40SiO2].x[La2O3], (x=0,2,4, and 6 mol% of La2O3) using a conventional melt-quench method. XRD confirmed the amorphous nature of the glass samples. Differential scanning calorimetry (DSC) was used to identify the glass transition (Tg) and crystallization temperatures (Tc) of the samples. Further, controlled heat treatment of the glasses led to the fabrication of glass-ceramics and their XRD analysis revealed polycrystalline structure, predominantly consisting of a major phase of tetragonal Fresnoite (Ba2TiO8Si2). Furthermore, with the addition of La2O3, the prepared GCs exhibited improved physical properties, including an increase in density (3.783�4.611 g/cm3) and oxygen packing density (81.177�92.303 g-atom/l). Additionally, to study the bonding and structural characteristics, FTIR and Raman spectroscopies were conducted. In order to study the optical properties, UV�visible spectroscopy was executed and showed a reduced indirect energy band gap from 4.290 to 4.220 eV with increasing La2O3. To study the morphological behaviour, SEM and TEM were performed. Eventually, to examine the dielectric characteristics, relative dielectric constant (?r) and dielectric loss (Tan ?) over the glass-ceramics was conducted using a �Novocontrol Impedance Analyzer�. The ?r and Tan ? values exhibited temperature-dependent behaviour and found to be increased within the frequency range of 1 kHz to 1 MHz. The BTSLC6 glass-ceramic, (24BaO.30TiO2.40SiO2.6La2O3), exhibited a high dielectric constant of ? 9335 and a low dielectric loss of 0.52 at 1 kHz, mainly due to space charge polarization. This makes it a promising candidate for applications in multilayer ceramic capacitors, energy storage, photonics, and electronics. � 2024 Elsevier B.V.Publication Synthesis, physical, optical and structural properties of SrTiO3 borosilicate glasses with addition of CrO3(Springer, 2023) Madheshiya, Abhishek; Singh, Anod Kumar; Shweta; Mishra, Rajat Kumar; Dey, Krishna Kishor; Ghosh, Manasi; Srivastava, Kamal K; Garg, Prerna; Gautam, ChandkiramHerein, we reported physical, optical and NMR characteristics of SrTiO3-based borosilicate glasses-doped chromium trioxide, CrO3 (1�7 mol%). Five glass samples (GS) were fabricated from the glassy system 60[Sr�TiO3]�40[2SiO2�B2O3] via a rapid melt-quench technique. X-ray diffraction analysis revealed the unstructured behaviour of the glasses. Numerous physical parameters were calculated and explained in detail. Urbach energy (EU) and skin depth (?) were studied to approve the disordered structure of glasses. Recorded infrared spectra of glasses were utilized to clarify the stretching mode of vibrations between the atoms, which correlated with their structural features and compositional variations. The energy bandgap (Eg) was estimated by employing a Davis and Mott relationship that comprises an absorption coefficient, ?, as well as photon energy, h?. Further, nuclear magnetic resonance (solid-state) spectra of the glasses were recorded and their analysis showed that the silicate and borate networks became highly polymerized with decreasing concentration of SrTiO3. � 2023, Indian Academy of Sciences.
