International Journal of Nano Dimension (Int. J. Nano Dimens.)Biosynthesized Zinc Oxide nanoparticles control the growth of Aspergillus flavus and its aflatoxin productionVolume 10 (2019)Issue 4, October 201920240207Biosynthesized Zinc Oxide nanoparticles control the growth of Aspergillus flavus and its aflatoxin productionENPritiKumariAryabhatta Centre for Nanoscience and Nanotechnology, Aryabhatta Knowledge University, Patna, 800001 India.0000-0002-1364-5751HarishKumarDepartment of Botany and Biotechnology, College of Commerce, Arts and Science, Patna, 800020, India.JitendraKumarDepartment of Botany and Biotechnology, College of Commerce, Arts and Science, Patna, 800020, India.MohammadSohailUniversity Department of Zoology, Vinoba Bhave University, Hazaribag, 825301, India.KrisnhaSinghUniversity Department of Zoology, Vinoba Bhave University, Hazaribag, 825301, India.KamalPrasadUniversity Department of Physics, T.M. Bhagalpur University, Bhagalpur, 812007, India.Journal Article20240207The infection of Aspergillus flavus and its aflatoxin production pose a severe threat to humans, animals as well as plants life. Their inhibition using green techniques are considered as one of the important challenges. The present study outlines the antifungal activity of the ZnO nanoparticles (NPs) synthesized from lemongrass leaf extract and their effect on the mycelial growth of Aspergillus flavus and its aflatoxins production. The qualitative and quantitative analyses of aflatoxins were determined, respectively using thin-layer chromatography and spectrophotometric methods. The X-ray diffraction as well as scanning and transmission electron microscopy studies indicated the formations of hexagonal ZnO NPs having the sizes ranged between 7 and 14 nm. FTIR spectrum confirmed the formation of ZnO NPs. The ZnO NPs displayed 92.25% inhibition of the growth of A. flavus and 100% inhibition of the aflatoxins production at the concentrations of 200 µl/mL and 150 µl/mL respectively. The present biosynthetic method is a simple, cost-effective, eco-friendly, high yield, green and handy protocol capable of synthesizing ZnO NPs, which might have accomplished due to the activities of plant metabolites and phytochemicals available in the lemongrass leaves parenchyma. This study revealed that ZnO NPs have the potential to forbid the growth of A. flavus and its aflatoxins production. Hence, ZnO NPs could be used in the plant protection and as a preservative for safe storage of food commodities to prevent A. flavus contamination and aflatoxins poisoning in coming future.International Journal of Nano Dimension (Int. J. Nano Dimens.)Synthesis of MnFe2O4 nanoparticles for adsorption of digestive enzymes: Kinetics, isothermal and thermodynamics studiesVolume 10 (2019)Issue 4, October 201920240207Synthesis of MnFe2O4 nanoparticles for adsorption of digestive enzymes: Kinetics, isothermal and thermodynamics studiesENAdeogunAbideen IdowuChemistry Department, Federal University of Agriculture, Abeokuta, Nigeria.KareemSarafadeen OlatejuDepartment of Microbiology, Federal University of Agriculture, Abeokuta, Nigeria.AdebayoOluwatobi SamsonDepartment of Microbiology, Federal University of Agriculture, Abeokuta, Nigeria.Journal Article20240207The role of enzyme engineering in biotechnology, biological and pharmaceutical process cannot be over emphasized. This study compared the adsorption of amylase and protease on to manganese ferrite (MnFe2O4). The metal ferrite was synthesized via a sol – gel technique and characterized with scanning electron microscopy (SEM), X-ray diffraction (XRD), Electron paramagnetic resonance (EPR) and Fourier transform infrared spectroscopy (FTIR). The adsorption was study in a batch process and the data were subjected to kinetics and isotherm models. The pseudo-first order best fitted the kinetic data with R2> 0.99. The data were fitted well by the entire isotherm models considered with the maximum adsorption isotherm of 1.602 and 7.330 mg/g. The thermodynamic parameters give negative Gibb’s free energy, ΔG, showing a spontaneous adsorption; positive ΔH indicated an endothermic favoured process, while ΔS values showed that the process progress with lower entropy change.International Journal of Nano Dimension (Int. J. Nano Dimens.)8-Hydroxyquinoline grafted nanoporous SBA-15 as a novel solid phase extractor for preconcentration of trace amount of CopperVolume 10 (2019)Issue 4, October 2019202402078-Hydroxyquinoline grafted nanoporous SBA-15 as a novel solid phase extractor for preconcentration of trace amount of CopperENLeilaHajiaghababaeiDepartment of Chemistry, Yadegar -e- Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran.0000-0001-8981-8447LeilaHajiaghababaeiDepartment of Chemistry, Yadegar -e- Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran.0000-0001-8981-8447AlirezaBadieiSchool of Chemistry, College of Science, University of Tehran, Tehran, Iran.MehdiKarimiSchool of Chemistry, College of Science, University of Tehran, Tehran, Iran.MohammadReza GanjaliDepartment of Chemistry, Alzahra University, Tehran, Iran.GhodsiMohammadi ZiaraniDepartment of Chemistry, Alzahra University, Tehran, Iran.Journal Article20240207In this study, the potential of 8-Hydroxyquinoline grafted SBA-15 to extract of Cu2+ cations from aqueous solutions was investigated. SBA-15 nanoporous silica was chemically grafted with 8-Hydroxyquinoline groupsaccording to the procedure in the literature. The presence of organic groups in the silica framework was demonstrated by FTIR spectrum. The grafted product showed the BET surface area 458 m2g-1 and pore diameter 54 ºA, based on adsorption-desorption of N2 at 77 ºK.. Flame atomic absorption spectrometry was used to determination of the ions concentration in the recovery and sample solution. The effects of several variables (amount of adsorbent, stirring time, pH and the presence of other metals in the medium) were studied. Cu2+ ions were completely extracted at pH= 4.5-7 after stirring for 15 minutes. The maximum capacity of the adsorbent was found to be 31.25 mg of Cu2+ per each gram of 8-Hydroxyquinoline grafted SBA-15. The minimum amount of acid for stripping of ions from grafted SBA-15 was tested and the preconcentration factor of the method was found 50. Finally, the proposed method was successfully applied as a new solid extractor to preconcentration and determination of trace amounts of Cu2+ ions in spiked distilled and tap water samples.International Journal of Nano Dimension (Int. J. Nano Dimens.)Assessment of antioxidant and antibacterial activities of Zinc Oxide nanoparticles, Graphene and Graphene decorated by Zinc Oxide nanoparticlesVolume 10 (2019)Issue 4, October 201920240207Assessment of antioxidant and antibacterial activities of Zinc Oxide nanoparticles, Graphene and Graphene decorated by Zinc Oxide nanoparticlesENAshrafAhmadi ShadmehriDepartment of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran.FaridehNamvarDepartment of Medicine, Mashhad Branch, Islamic Azad University, Mashhad, Iran.HamidrezaMiriSchool of medicine, Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh, Iran.ParichehreYaghmaeiDepartment of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran.MahboobehNakhaei MoghaddamDepartment of Biology, Mashhad Branch, Islamic Azad University, Mashhad, Iran.Journal Article20240207Zinc Oxide nanoparticles (ZnO-NPs) and graphene carbon material, due to lower drug resistance, can replace antibiotics, and by decorating of graphene with Zn-NPs, their properties can be greatly improved. The purpose of this study was to evaluate the antioxidant and antibacterial effects of ZnO-NPs biosynthesized using Crocus Sativus petal extract, graphene and graphene decorated by ZnO-NPs biosynthesized using Crocus Sativus petal extract (G-ZnO). Their physicochemical characterizations were performed by UV-Vis spectroscopy, Transmission electron microscopy (TEM) and field emission scanning electron microscopy (FE-SEM), revealing that ZnO-NPs with a mean size of 25 nm and spherical-shape were distributed uniformly on the surface of the graphene without aggregation. The antioxidant activities of ZnO-NPs, graphene and G-ZnO were evaluated using DPPH and ABTS assays. Antibacterial activities of three compounds were tested against Gram negative bacteria Escherichia coli (E. coli) and Gram positive bacteria Staphylococcus aureus (S. aureus) using macrodilution method. The results of this study showed that these three compounds have antioxidant and antibacterial effects. And it was show that but also antioxidant and antibacterial activity of G-ZnO was higher than ZnO-NPs and graphene. G-ZnO could be useful as a natural antioxidant and antibacterial in the pharmacy industry.International Journal of Nano Dimension (Int. J. Nano Dimens.)Microwave-assisted green synthesis of Gold nanoparticles and Its catalytic activityVolume 10 (2019)Issue 4, October 201920240207Microwave-assisted green synthesis of Gold nanoparticles and Its catalytic activityENBidhanMohantaDepartment of Physics, Assam University, Silchar, India.0000-0001-7587-6179BidhanMohantaDepartment of Physics, Assam University, Silchar, India.0000-0001-7587-6179Journal Article20240207The present work demonstrated a green approach of synthesis of gold nanoparticles using Eupatorium odoratum leaf extract as reducing and stabilizing agent assisted with microwave irradiation. Effects of various concentrations of leaf extract on the preparation of gold nanoparticles have been investigated and it was monitored by undertaking UV-vis spectroscopic studies. The experimental results showed that the surface Plasmon resonance (SPR) peak blue shifted with increase in the concentration of leaf extract indicating the decrease of nanoparticles size, which was further confirmed by the Dynamic light scattering (DLS) data. Synthesized particles were further characterized by Fourier Transform Infra-Red spectroscopy (FTIR) and Transmission Electron Microscopy (TEM). All the characterization results confirmed the formation of stable spherical mono-dispersed gold nanoparticles with size ranging from 10-20 nm. The catalytic activity of prepared gold nanoparticles was checked by reducing Nitrophenol to Aminophenol in presence of an excess amount of sodium borohydride. The progress of the reaction was examined by observing the absorbance peak of UV-vis spectroscopy. The study showed positive results and it was found that gold nanoparticles synthesized with 600 µL leaf extract have greater catalytic activity. It was also found that gold nanoparticles remained stable for long duration of time.
The present work demonstrated a green approach of synthesis of gold nanoparticles using Eupatorium odoratum leaf extract as reducing and stabilizing agent assisted with microwave irradiation. Effects of various concentrations of leaf extract on the preparation of gold nanoparticles have been investigated and it was monitored by undertaking UV-vis spectroscopic studies. The experimental results showed that the surface Plasmon resonance (SPR) peak blue shifted with increase in the concentration of leaf extract indicating the decrease of nanoparticles size, which was further confirmed by the Dynamic light scattering (DLS) data. Synthesized particles were further characterized by Fourier Transform Infra-Red spectroscopy (FTIR) and Transmission Electron Microscopy (TEM). All the characterization results confirmed the formation of stable spherical mono-dispersed gold nanoparticles with size ranging from 10-20 nm. The catalytic activity of prepared gold nanoparticles was checked by reducing Nitrophenol to Aminophenol in presence of an excess amount of sodium borohydride. The progress of the reaction was examined by observing the absorbance peak of UV-vis spectroscopy. The study showed positive results and it was found that gold nanoparticles synthesized with 600 µL leaf extract have greater catalytic activity. It was also found that gold nanoparticles remained stable for long duration of time.International Journal of Nano Dimension (Int. J. Nano Dimens.)Improved drain current characteristics of tunnel field effect transistor with heterodielectric stacked structureVolume 10 (2019)Issue 4, October 201920240207Improved drain current characteristics of tunnel field effect transistor with heterodielectric stacked structureENVimalaPalanichamyAssociate Professor, Department of Electronics and Communication Engineering, Dayananda Sagar College of Engineering, Bangalore, India.NetravathiKulkarniPG Scholar, Department of Electronics and Communication Engineering, Dayananda Sagar College of Engineering, Bangalore, India.ArunSamuel Thankamony SarasamAssociate Professor, Department of Electronics and Communication Engineering, National Engineering College, Kovilpatti, Tamilnadu, India.Journal Article20240207In this paper, we proposed a 2-D analytical model for electrical characteristics such as surface potential, electric field and drain current of Silicon-on-Insulator Tunnel Field Effect Transistor (SOI TFETs) with a SiO2/High-k stacked gate-oxide structure. By using superposition principle with suitable boundary conditions, the Poisson’s equation has been solved to model the channel region potential. The modeled channel potential is to calculate both vertical and lateral electric field. 2-D Kane’s model is used to calculate the drain current of TFET and the expression is taken out by analytically integrating the band-to-band tunneling generation rate over the thickness of channel region. The device is modeled in variation with different device parameters like channel length (LCH), dielectric thickness (tox), silicon thickness (tsi) and input voltage (Vds and Vgs). Also, the comparison of SiO2 and stacked high k dielectric TFET is obtained. It has been found from the presented results that the hetero-dielectric stacked TFET structure provides ON current 10-6A/um. However, SiO2 dielectric structure provides the ON current of 10-8A/um. The proposed model is validated by comparing it with Technology Computer-Aided Design (TCAD) simulation results obtained by using SILVACO ATLAS device simulation software.International Journal of Nano Dimension (Int. J. Nano Dimens.)Combined effects of pressure, temperature, and magnetic field on the ground state of donor impurities in a GaAs/AlGaAs quantum heterostructureVolume 10 (2019)Issue 4, October 201920240207Combined effects of pressure, temperature, and magnetic field on the ground state of donor impurities in a GaAs/AlGaAs quantum heterostructureENSamahAbuzaidDepartment of Physics, An-Najah National University, Nablus,West Bank, Jordan.AyhamShaerDepartment of Physics, An-Najah National University, Nablus,West Bank, Jordan.MohammadElsaidDepartment of Physics, An-Najah National University, Nablus,West Bank, Jordan.Journal Article20240207In the present work, the exact diagonalization method had been implemented to calculate the ground state energy of shallow donor impurity located at finite distance along the growth axis in GaAs/AlGaAs heterostructure in the presence of a magnetic field taken to be along z direction. The impurity binding energy of the ground state had been calculated as a function of confining frequency and magnetic field strength. We found that the ground state donor binding energy (BE) calculated at =2 and , decreases from BE=7.59822 to BE=2.85165 , as we change the impurity position from d=0.0 to d=0.5 ,respectively .In addition, the combined effects of pressure and temperature on the binding energy, as a function of magnetic field strength and impurity position, had been shown using the effective-mass approximation. The numerical results show that the donor impurity binding energy enhances with increasing the pressure while it decreases as the temperature decreases.International Journal of Nano Dimension (Int. J. Nano Dimens.)Novel attributes of steep-slope staggered type heterojunction p-channel electron-hole bilayer tunnel field effect transistorVolume 10 (2019)Issue 4, October 201920240207Novel attributes of steep-slope staggered type heterojunction p-channel electron-hole bilayer tunnel field effect transistorENZahraAhangariDepartment of Electronic, Faculty of Electrical Engineering Yadegar-e-Imam Khomeini (RAH), Shahr-e-Rey Branch, Islamic Azad University, Tehran, Iran.Journal Article20240207In this paper, the electrical characteristics and sensitivity analysis of staggered type p-channel heterojunction electron-hole bilayer tunnel field effect transistor (HJ-EHBTFET) are thoroughly investigated via simulation study. The minimum lattice mismatch between InAs/GaAs0.1Sb0.9 layers besides low carrier effective mass of materials provides high probability of tunneling current that eventually boosts the device performance. Unlike the conventional lateral tunnel field effect transistor (TFET), band to band tunneling (BTBT) in HJ-EHBTFET occurs in the electrically doped intrinsic channel and in the vertical direction which may considerably improve the on-state current. Due to the abrupt BTBT and steep transition from the off-state to on-state, subthreshold swing of 2mV/dec with on/off current ratio of 3.85×1013 is obtained. The sensitivity of main electrical parameters is computed via calculating their related standard deviation and mean values with respect to the variation of device critical design parameters. The 2D variation matrix of threshold voltage is computed as a function of top and bottom gate workfunction for determining an optimum value aiming towards competent electrical characteristics. In addition, the sensitivity analysis reveals that the electrical parameters are rarely susceptible to the source doping density, which may considerably solve the limit of dopant solubility in III-V materials. Moreover, HJ-EHBTFET is dramatically unaffected by the variation of gate overlap length and drain voltage, which makes the device have efficient performance in nanoscale regime.International Journal of Nano Dimension (Int. J. Nano Dimens.)Green synthesis, characterization, and photo catalytic degradation efficiency of Trimanganese Tetroxide nanoparticleVolume 10 (2019)Issue 4, October 201920240207Green synthesis, characterization, and photo catalytic degradation efficiency of Trimanganese Tetroxide nanoparticleENGopalakrishnanNair SreekalaNanoscience Research Lab, Dept. of Chemistry, KSMDB College, Sasthamcotta, Kollam PLN-690521, Kerala, India.FathimabeeviAbdullakuttyNanoscience Research Lab, Dept. of Chemistry, KSMDB College, Sasthamcotta, Kollam PLN-690521, Kerala, India.BhaskaranBeenaNanoscience Research Lab, Dept. of Chemistry, KSMDB College, Sasthamcotta, Kollam PLN-690521, Kerala, India.Journal Article20240207Mn3O4 nanoparticles has been synthesised from Manganese (II) acetate and Simarouba Glauca leaf extract using microwave heating. This novel method of synthesis of Mn3O4 is fast, low-cost, non-toxic and environment friendly. The synthesised product was characterised by powder X-ray diffraction(XRD),Fourier transform infrared spectroscopy( FT-IR), Ultraviolet-Visible spectroscopy( UV-Visible), X-ray photoelectron spectroscopy( XPS), Scanning electron microscopy(SEM) and Transmission electron microscopy(TEM). The prepared material was identified as of tetragonal hausmannite crystalline structure with spherical morphology and particle size 15 nm. Photo catalytic degradation ability of the synthesised product was examined by using it for the degradation of Malachite green dye in various experimental conditions under visible light. The synthesised Mn3O4 was found to be an efficient photo catalyst for the removal of Malachite green at the optimum conditions of pH 9, adsorbent dose 0.1 g and dye concentration 20ppm. This study thus reveals the applicability of nanoparticles of Mn3O4 for the removal of pollutants from industrial waste water.International Journal of Nano Dimension (Int. J. Nano Dimens.)Investigations on structural, optical, and AC conductivity of Polyaniline/Manganese Dioxide nanocompositesVolume 10 (2019)Issue 4, October 201920240207Investigations on structural, optical, and AC conductivity of Polyaniline/Manganese Dioxide nanocompositesENSubbiahChelladurai Vella DuraiDepartment of Physics, JP College of Arts and Science, Agarakattu, Tenkasi - 627852, Tamil Nadu, India.0000-0002-9897-3403EsakkimuthuKumarSchool of Science, Tamil Nadu Open University, Chennai-600015. Tamil Nadu, India.DurairajMuthurajPG and Research Department of Physics, The M.D.T Hindu College, Tirunelveli -627010. Tamil Nadu, India.VethamanickamBena JothyDepartment of Physics & Research Center, Women’s Christian College, Nagarcoil -62900l. Tamil Nadu, India.Journal Article20240207A Polyaniline/Manganese dioxide (PANI/MnO2) nanocomposite contains five weight percentages of MnO2. It has been successfully prepared by in situ polymerization. The structural, optical, and conductivity of nanocomposites remain relative to changes with respect to the weight percentage of MnO2. The structural, morphological, optical, and electrical conductivity investigation of pure MnO2, pure PANI, and nanocomposites were done with powder XRD, HRTEM, SEM, FT-IR, UV and Impedance spectra. XRD results of the PANI/MnO2 nanocomposites say that the crystalline structure is converted into a very less crystalline structure due to the incorporation of MnO2 which is inside PANI chain. The HRTEM and SEM images are confirmed to the nanocomposite formation, morphology studies and also supported to the XRD results. From the optical spectra, MnO2 nanoparticles have been impressed in the surface of PANI. It works as the compensator in the formation of nanocomposites. UV spectral analysis reveals that the absorption of MnO2 modifies the absorption wavelength of under visible light in whole range. The absorption wavelength of nanocomposites is 288 nm and 337 nm. AC electrical conductivity of the prepared nanocomposites from impedance spectroscopy was carried out and compared with pure materials. The AC conductivity of as-prepared nanocomposites has been analyzed in the range of 298 K to 423 K. The AC conductivity of nanocomposites varies depending upon a change of logarithmic frequency.