Subjects -> ENERGY (Total: 414 journals)
    - ELECTRICAL ENERGY (12 journals)
    - ENERGY (252 journals)
    - ENERGY: GENERAL (7 journals)
    - NUCLEAR ENERGY (40 journals)
    - PETROLEUM AND GAS (58 journals)
    - RENEWABLE ENERGY (45 journals)

ENERGY (252 journals)                  1 2 | Last

Showing 1 - 200 of 406 Journals sorted alphabetically
ACS Applied Energy Materials     Hybrid Journal   (Followers: 4)
ACS Energy Letters     Hybrid Journal   (Followers: 4)
Advanced Energy and Sustainability Research     Open Access   (Followers: 5)
Advanced Materials Technologies     Hybrid Journal   (Followers: 2)
Advances in Applied Energy     Open Access   (Followers: 2)
Advances in Building Energy Research     Hybrid Journal   (Followers: 11)
Advances in Energy and Power     Open Access   (Followers: 16)
Advances in High Energy Physics     Open Access   (Followers: 23)
Advances in Natural Sciences : Nanoscience and Nanotechnology     Open Access   (Followers: 28)
American Journal of Energy and Environment     Open Access   (Followers: 4)
American Journal of Energy Research     Open Access   (Followers: 7)
Annals of Nuclear Energy     Hybrid Journal   (Followers: 7)
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 4)
Annual Review of Resource Economics     Full-text available via subscription   (Followers: 11)
Applications in Energy and Combustion Science     Open Access   (Followers: 3)
Applied Energy     Partially Free   (Followers: 26)
Applied Nanoscience     Open Access   (Followers: 7)
Applied Solar Energy     Hybrid Journal   (Followers: 20)
Archives of Thermodynamics     Open Access   (Followers: 10)
Asian Bulletin of Energy Economics and Technology     Open Access   (Followers: 1)
Atomic Energy     Hybrid Journal   (Followers: 5)
Batteries     Open Access   (Followers: 8)
Batteries & Supercaps     Hybrid Journal   (Followers: 5)
Biofuel Research Journal     Open Access   (Followers: 1)
Biofuels     Hybrid Journal   (Followers: 11)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
BioPhysical Economics and Resource Quality     Hybrid Journal  
BMC Energy     Open Access  
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 50)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 18)
Carbon Energy     Open Access   (Followers: 1)
Carbon Management     Hybrid Journal   (Followers: 5)
Carbon Resources Conversion     Open Access   (Followers: 2)
CERN courier. International journal of high energy physics     Free   (Followers: 8)
Chain Reaction     Full-text available via subscription  
Clean Energy     Open Access   (Followers: 2)
Clean Technologies     Open Access   (Followers: 1)
Clefs CEA     Full-text available via subscription   (Followers: 1)
Climate and Energy     Full-text available via subscription   (Followers: 6)
Computational Water, Energy, and Environmental Engineering     Open Access   (Followers: 5)
CPSS Transactions on Power Electronics and Applications     Open Access   (Followers: 2)
CSEE Journal of Power and Energy Systems     Open Access   (Followers: 1)
CT&F - Ciencia, Tecnología y Futuro     Open Access  
Current Opinion in Green and Sustainable Chemistry     Hybrid Journal  
Dams and Reservoirs     Hybrid Journal   (Followers: 3)
Development of Energy Science     Open Access   (Followers: 4)
Discover Energy     Open Access  
Discover Sustainability     Open Access   (Followers: 3)
Distributed Generation & Alternative Energy Journal     Hybrid Journal   (Followers: 3)
e-Prime : Advances in Electrical Engineering, Electronics and Energy     Open Access   (Followers: 2)
E3S Web of Conferences     Open Access  
Economics and Policy of Energy and the Environment     Full-text available via subscription   (Followers: 13)
Electricity Journal     Hybrid Journal   (Followers: 1)
Energetic Materials Frontiers     Open Access  
ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations     Open Access  
Energy     Partially Free   (Followers: 40)
Energy & Environment     Hybrid Journal   (Followers: 25)
Energy & Fuels     Hybrid Journal   (Followers: 27)
Energy and AI     Open Access   (Followers: 1)
Energy and Buildings     Hybrid Journal   (Followers: 12)
Energy and Climate Change     Hybrid Journal   (Followers: 4)
Energy and Emission Control Technologies     Open Access   (Followers: 3)
Energy and Environment Focus     Free   (Followers: 7)
Energy and Environment Research     Open Access   (Followers: 13)
Energy and Environmental Engineering     Open Access   (Followers: 5)
Energy and Power     Open Access   (Followers: 18)
Energy and Power Engineering     Open Access   (Followers: 23)
Energy Conversion and Economics     Open Access  
Energy Conversion and Management     Hybrid Journal   (Followers: 15)
Energy Conversion and Management : X     Open Access   (Followers: 1)
Energy Efficiency     Hybrid Journal   (Followers: 9)
Energy Geoscience     Open Access  
Energy Informatics     Open Access  
Energy Journal The     Hybrid Journal   (Followers: 14)
Energy Materials : Materials Science and Engineering for Energy Systems     Hybrid Journal   (Followers: 19)
Energy Nexus     Open Access  
Energy Policy     Partially Free   (Followers: 73)
Energy Prices and Taxes     Full-text available via subscription   (Followers: 6)
Energy Reports     Open Access   (Followers: 5)
Energy Research & Social Science     Full-text available via subscription   (Followers: 11)
Energy Science & Engineering     Open Access   (Followers: 6)
Energy Science and Technology     Open Access   (Followers: 10)
Energy Storage     Hybrid Journal   (Followers: 2)
Energy Storage Materials     Full-text available via subscription   (Followers: 5)
Energy Strategy Reviews     Open Access   (Followers: 8)
Energy Studies Review     Open Access   (Followers: 5)
Energy Systems     Hybrid Journal   (Followers: 11)
Energy Technology     Partially Free   (Followers: 5)
Energy Technology & Policy     Open Access   (Followers: 2)
Energy Transitions     Open Access  
Energy, Ecology and Environment     Hybrid Journal  
Energy, Sustainability and Society     Open Access   (Followers: 15)
EnergyChem     Hybrid Journal   (Followers: 1)
Environmental Progress & Sustainable Energy     Hybrid Journal   (Followers: 7)
EPJ Photovoltaics     Open Access   (Followers: 2)
eScience     Open Access   (Followers: 1)
Facta Universitatis, Series : Electronics and Energetics     Open Access  
Forces in Mechanics     Open Access   (Followers: 2)
Foundations and Trends® in Renewable Energy     Full-text available via subscription   (Followers: 4)
Frontiers in Energy     Hybrid Journal   (Followers: 4)
Frontiers in Energy Research     Open Access   (Followers: 5)
Fuel and Energy Abstracts     Full-text available via subscription   (Followers: 7)
Fuel Communications     Open Access   (Followers: 2)
Functional Materials Letters     Hybrid Journal   (Followers: 3)
Gcb Bioenergy     Open Access   (Followers: 2)
Geomechanics and Geophysics for Geo-Energy and Geo-Resources     Hybrid Journal  
Geomechanics for Energy and the Environment     Full-text available via subscription  
Geothermal Energy     Open Access   (Followers: 5)
Global Challenges     Open Access  
Global Energy Interconnection     Open Access  
Global Energy Law and Sustainability     Hybrid Journal  
Global Transitions     Open Access   (Followers: 1)
Global Transitions Proceedings     Open Access  
Green Energy & Environment     Open Access   (Followers: 2)
High Voltage     Open Access  
IEEE Open Access Journal of Power and Energy     Open Access   (Followers: 1)
IEEE Open Journal of Power Electronics     Open Access   (Followers: 12)
IEEE Power and Energy     Full-text available via subscription   (Followers: 36)
IEEE Transactions on Energy Conversion     Hybrid Journal   (Followers: 16)
IEEE Transactions on Nuclear Science     Hybrid Journal   (Followers: 10)
IEEE Transactions on Power Systems     Hybrid Journal   (Followers: 45)
IET Energy Systems Integration     Open Access   (Followers: 1)
IET Power Electronics     Open Access   (Followers: 76)
IET Smart Grid     Open Access   (Followers: 2)
Ingeniería Energética     Open Access  
Innovations : Technology, Governance, Globalization     Hybrid Journal   (Followers: 10)
International Journal of Alternative Propulsion     Hybrid Journal   (Followers: 23)
International Journal of Ambient Energy     Hybrid Journal  
International Journal of Applied Power Engineering     Open Access   (Followers: 4)
International Journal of Clean Coal and Energy     Open Access   (Followers: 2)
International Journal of Coal Science & Technology     Open Access   (Followers: 1)
International Journal of Electric and Hybrid Vehicles     Hybrid Journal   (Followers: 8)
International Journal of Energy & Engineering Sciences     Open Access  
International Journal of Energy and Environmental Engineering     Open Access   (Followers: 3)
International Journal of Energy and Power     Open Access   (Followers: 8)
International Journal of Energy and Smart Grid     Open Access   (Followers: 1)
International Journal of Energy and Statistics     Hybrid Journal   (Followers: 3)
International Journal of Energy and Water Resources     Hybrid Journal  
International Journal of Energy Research     Hybrid Journal   (Followers: 8)
International Journal of Global Energy Issues     Hybrid Journal   (Followers: 8)
International Journal of Green Energy     Hybrid Journal   (Followers: 8)
International Journal of Hydrogen Energy     Partially Free   (Followers: 19)
International Journal of Nuclear Desalination     Hybrid Journal   (Followers: 1)
International Journal of Nuclear Energy Science and Technology     Hybrid Journal   (Followers: 4)
International Journal of Nuclear Governance, Economy and Ecology     Hybrid Journal  
International Journal of Nuclear Hydrogen Production and Applications     Hybrid Journal   (Followers: 1)
International Journal of Nuclear Knowledge Management     Hybrid Journal   (Followers: 2)
International Journal of Power and Energy Conversion     Hybrid Journal   (Followers: 1)
International Journal of Smart Grid and Green Communications     Hybrid Journal   (Followers: 2)
International Journal of Sustainable Energy     Hybrid Journal   (Followers: 12)
International Journal of Sustainable Energy Planning and Management     Open Access   (Followers: 5)
International Journal of Sustainable Engineering     Hybrid Journal   (Followers: 4)
International Journal of Thermodynamics     Open Access   (Followers: 15)
International Journal of Turbomachinery, Propulsion and Power     Open Access   (Followers: 23)
Joule     Hybrid Journal   (Followers: 5)
Journal of Alternate Energy Sources & Technologies     Full-text available via subscription   (Followers: 2)
Journal of Building Performance Simulation     Hybrid Journal   (Followers: 5)
Journal of China Coal Society     Open Access  
Journal of Computational Multiphase Flows     Open Access   (Followers: 1)
Journal of Energy     Open Access   (Followers: 2)
Journal of Energy & Natural Resources Law     Hybrid Journal   (Followers: 5)
Journal of Energy and Environment Technology of Graduate School Siam Technology College     Open Access  
Journal of Energy Chemistry     Full-text available via subscription   (Followers: 3)
Journal of Energy in Southern Africa     Open Access   (Followers: 2)
Journal of Energy Research and Reviews     Open Access  
Journal of Energy Storage     Full-text available via subscription   (Followers: 4)
Journal of Energy Systems     Open Access  
Journal of Energy Technologies and Policy     Open Access   (Followers: 5)
Journal of Energy, Environment & Carbon Credits     Full-text available via subscription   (Followers: 4)
Journal of Energy, Mechanical, Material and Manufacturing Engineering     Open Access   (Followers: 3)
Journal of Fusion Energy     Hybrid Journal   (Followers: 2)
Journal of International Energy Policy     Open Access   (Followers: 4)
Journal of Modern Power Systems and Clean Energy     Open Access   (Followers: 9)
Journal of Nano Energy and Power Research     Full-text available via subscription   (Followers: 4)
Journal of Nuclear Energy Science & Power Generation Technology     Hybrid Journal   (Followers: 2)
Journal of Ocean and Climate     Open Access   (Followers: 9)
Journal of Ocean Engineering and Marine Energy     Hybrid Journal   (Followers: 2)
Journal of Photochemistry and Photobiology A: Chemistry     Hybrid Journal   (Followers: 3)
Journal of Photochemistry and Photobiology B: Biology     Hybrid Journal   (Followers: 4)
Journal of Photochemistry and Photobiology C: Photochemistry Reviews     Full-text available via subscription   (Followers: 3)
Journal of Photonics for Energy     Hybrid Journal   (Followers: 2)
Journal of Physical Chemistry C     Hybrid Journal   (Followers: 36)
Journal of Power and Energy Engineering     Open Access   (Followers: 2)
Journal of Power Electronics     Hybrid Journal   (Followers: 8)
Journal of Power Electronics & Power Systems     Full-text available via subscription   (Followers: 19)
Journal of Power Sources Advances     Open Access  
Journal of Renewable Energy     Open Access   (Followers: 8)
Journal of Solar Energy     Open Access   (Followers: 11)
Journal of Solar Energy Engineering     Full-text available via subscription   (Followers: 18)
Journal of Sustainable Bioenergy Systems     Full-text available via subscription  
Journal of Technology Innovations in Renewable Energy     Hybrid Journal   (Followers: 2)
Journal of Technology Management for Growing Economies     Open Access   (Followers: 4)
KnE Energy     Open Access  
Materials for Renewable and Sustainable Energy     Open Access   (Followers: 6)
Materials Reports : Energy     Open Access   (Followers: 1)
Materials Today Energy     Hybrid Journal   (Followers: 2)
Mekanika : Jurnal Teknik Mesin i     Open Access  
Michigan Journal of Sustainability     Open Access   (Followers: 1)
Multequina     Open Access  
Natural Resources     Open Access  

        1 2 | Last

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Applied Nanoscience
Number of Followers: 7  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2190-5509 - ISSN (Online) 2190-5517
Published by SpringerOpen Homepage  [228 journals]
  • Magnetite/Rhodamine 6G nanoparticles internalization in Neurospora crassa
           cells: towards the magnetic hyperthermia application

    • Abstract: Abstract In this work, the study of aqueous media co-precipitation-obtained magnetite nanoparticles (Fe3O4-NPs) and Rhodamine 6G coating nanoparticles: Fe3O4/Rh6G-NPs, stabilized with polyethylene glycol is presented. To assess their suitability for magnetic hyperthermia application, cellular internalization of Fe3O4/Rh6G nanoparticles using the fungus Neurospora crassa as a model system was also explored. The structural characterization by Infrared and Raman spectroscopies, as well as Transmission Electron Microscopy (TEM) of this material showed that the Fe3O4/Rh6G-NPs are chemically stable with a pure crystalline phase, exhibiting an average particle size of 38.6 ± 6.4 nm and a near-spherical shape; all these properties are desired for nanoparticles that are intended to be used in biomedical applications. Additionally, a marked superparamagnetic behavior in the composite was revealed by the magnetic characterization. The living cells exposed to Fe3O4/Rh6G-NPs showed fluorescence from the apical dome to the basal zone of the hyphae scanned under confocal microscopy; while TEM observations of ultrathin sections demonstrated the presence of Fe3O4/Rh6G-NPs throughout the cytoplasm of the fungus, corroborating internalization of the nanocomposite. It is worth mentioning that alteration of fungus growth or cell morphology after exposure to Fe3O4/Rh6G-NPs were not observed, which represent an important precedent of internalization of inorganic materials-based nanocomposites in cells for further exploration of magnetic hyperthermia applications.
      PubDate: 2022-06-01
       
  • The influence of nanomaterials on pyocyanin production by Pseudomonas
           aeruginosa

    • Abstract: Abstract Pseudomonas aeruginosa is a bacterium producing industrially utile metabolites, such as rhamnolipids, biopolymers, and pigments. Pyocyanin, the most studied example of pigments, is a virulence factor that also shows the potential for application in, e.g., agriculture, anticancer therapy, and energy production. Therefore, potential inhibitors and stimulants of pyocyanin production by P. aeruginosa should be studied, and nanomaterials may cause both effects. The study aimed to examine the influence of zinc oxide and multi-walled carbon nanotubes (pristine or dispersed with alginic acid) on pyocyanin production by P. aeruginosa. First, the influence of different concentrations of nanomaterials (500.00–0.06 µg/mL) on culture optical density and biofilm formation was studied. These results helped select concentrations for further tests, i.e., growth curves and fluorescence measurements. Pyocyanin production was assessed by the chloroform–hydrochloric acid method. SEM analysis was conducted to assess the influence of nanomaterials on the cell's integrity and biofilm structure. Pristine multi-walled carbon nanotubes exhibited a stimulative effect on pigment production when applied in high concentrations (500.00 µg/mL), while dispersed material enhanced the production in lowered dosages (125.00 µg/mL). On the other hand, high concentrations of zinc oxide inhibited pyocyanin production, while minor increased bioproduct production. The research indicates the potential to use nanomaterials as the modulators of pyocyanin production and other metabolites.
      PubDate: 2022-06-01
       
  • Synthesis, characterization, and optimization of Co-, Mn-, and
           Zn-substituted ferrite nanoparticles and nanoclusters for cancer
           theranostic applications

    • Abstract: Abstract In the diagnosis and treatment of cancerous tissues by nanoparticles, several injections with high doses of these particles have adverse biological effects. To overcome this dilemma, one approach would be to create multifunctional structures with simultaneous diagnostic and therapeutic applications. Hence, in this study, highly versatile superparamagnetic iron oxide-based nanoclusters with the proposed functionality are introduced. Cobalt ferrite as a hyperthermia agent and manganese–zinc ferrite as a contrast agent for magnetic resonance imaging (MRI) were synthesized and aggregated into clusters. The resultant structures were compared with the nanoparticles produced through the substitution of the same ions in the magnetic crystal lattice. The clusters were synthesized in a two-step process without any capping agent and the effect of particle’s surface potential on cluster formation in the presence of anionic and cationic surfactants was investigated. The magnetic properties and the suitability of the created structure are evaluated to confirm the feasibility for hyperthermia and clinical MRI application. Overall, the results demonstrated that the spherical compact clusters containing Co0.6Fe2.4O4 and Mn0.6Zn0.4Fe2O4 nanoparticles, with an average size of 100 nm, exhibited intrinsic loss power (ILP) of 15.72 nHm2/kg, relaxation rates ratio (r2/r1) of 16.62, and good colloidal stability suitable for cancerous applications.
      PubDate: 2022-06-01
       
  • Hydrothermally synthesized strontium-modified ZnO hierarchical
           nanostructured photocatalyst for second-generation fluoroquinolone
           degradation

    • Abstract: Abstract The utilization of visible light semiconductor photocatalyst was considered an effective technique to treat hazardous organic pollutants. From the focus of increasing the photocatalytic performance of zinc oxide, different concentrations of (5, 10, and 15%) strontium (Sr2+)-substituted ZnO hierarchical nanostructures were prepared by hydrothermal method. The sample characterizations were investigated by XRD, HR-SEM, photocurrent, EIS, and TOC analysis. The optical property of the samples was investigated by UV–visible diffuse reflectance spectra and photoluminescence (PL). The average crystalline size and strain (tensile strain) were calculated using the Williamson–Hall (W–H) plot. The hierarchical morphology of the sample was observed through SEM, and EDS confirms about the substitution of Sr. Occurrence of a peak at 142.7 eV in the XPS survey spectrum confirms the presence of Sr2+. Degradation of pollutant by 10% Sr–ZnO increases degradation efficiency from 44 to 97% with a time delay. The significant contribution of superoxide anions (•O2−) in degradation was obtained through scavenger analysis. TOC test confirms the decrement of organic carbon content. Reduction in electron–hole recombination was sufficiently attained because of the Sr atom, which functions as an electron transmitter. After degradation, the unchanged crystallinity nature of 10% Sr–ZnO reveals excellent stability and makes it a good candidate in environmental remediations.
      PubDate: 2022-06-01
       
  • Formation and characterisation of porous anodized aluminum oxide,
           synthesized electrochemically in the presence of graphene oxide

    • Abstract: Abstract The effect of nanoscale graphene oxide (GO) on the formation of porous anodized aluminum oxide (AAO) film has been studied. Graphene oxide powder has been analyzed by FTIR, X-ray, UV–VIS spectroscopy (colloid solution). The porous structure and morphology of AAO film were shown to be described by thermo-gravimetry, low-temperature sorption–desorption of nitrogen, SEM. The introduction of graphene oxide component (0.25%) into the oxalic electrolyte (0.3 M) transforms the pore size of AAO. As a result, film of anodized oxide with a narrow through honeycomb pores was formatted. The specific surface area of anodized aluminum oxide with graphene oxide (AAO/GO) was increased three times and pore radius is reduced twice to 22 nm, while increasing the total volume of micro-pores. Mesoporous ultrathin membranes were obtained that can be used for solutions and gas separation. The prospects’ approaches of synthesis for change porous structure of AAO are shown.
      PubDate: 2022-06-01
       
  • Hybrid Ag0/Ag2CO3–eggshell–plant nanocomposites for antimicrobial
           action prepared by bio-mechanochemical synthesis

    • Abstract: Abstract Silver carbonate and elemental silver nanoparticles embedded in the matrix of biological materials were successfully prepared via a bio-mechanochemical synthesis, i.e., one-step solvent-free approach utilizing high-energy ball milling. Namely, the powders of silver nitrate as a precursor of silver and a mixture of natural materials (eggshell waste and Thymus serpyllum L. plant) powders as reducing and stabilizing agents, were milled together. The optimization of experimental conditions was performed using a Taguchi design. The presence of nanoparticles was confirmed by a bunch of experimental techniques including XRD and TEM, their size being up to 15 nm. By means of AAS, the level of Ag stabilization was determined, being better when eggshell content was higher. The products also exhibited the antibacterial activity, and although the agar well diffusion method did show better results for the nanoparticles prepared using the eggshell or the plant alone, the respiratory tests have shown a good response also for the product prepared using a combination of the two. The strongest respiratory inhibition against Escherichia coli was observed for the nanoparticles prepared using only eggshell, but the ones synthesized using both reducing agents caused a prolonged inhibition against Staphylococcus aureus. The proposed synthetic approach offers the use of environmentally harmless technique and natural materials to yield antibacterially active nanoparticles.
      PubDate: 2022-06-01
       
  • Foliar application of nano-zinc oxide crystals improved zinc
           biofortification in cauliflower (Brassica oleracea L. var. botrytis)

    • Abstract: Abstract Lower levels of zinc in the food lead to Zn deficiency in the local population of Pakistan. The study aimed to increase the Zn fraction of an edible vegetable for which in-house fabrication of nano-Zn oxide crystals was performed using the sol–gel method. The synthesized nano-crystals exhibited ~ 25 nm diameter, and the XRD peaks indicated a single-phase hexagonal wurtzite crystal structure. The FT-IR spectrum confirmed the vibrational band of nZnO metallic crystals at a peak ranging between 400 and 500 cm−1 and a λmax at 380 nm, confirmed by UV–Vis spectra and SEM study, revealed an irregular morphology. These nanoparticles were applied as a foliar spray to 50-day-old cauliflower at 0, 25, 50, 75, and 100 µM nZnO concentrations during a field experiment, and data were collected after 50 d of spray treatments at maturity (100-day-old plants). Cauliflower growth traits were improved and non-toxic effects on the foliage was recorded. An increase in leaf chlorophyll and free amino acids was recorded as well. Furthermore, ZnO nano-crystal foliar application caused improvements in curd diameter and curd weight resulting in higher productivity. Nano-Zn spray treatments after the curd initiation improved curd Zn fraction at, particularly at 100 µM concentration (up to 34 µg g−1 DW). Conclusively, the applied nZnO crystals were non-toxic and biocompatible, and a significant fraction of Zn translocated to the cauliflower curd suggested the potential use in biofortification.
      PubDate: 2022-06-01
       
  • Enhanced electron transport by Fe2O3 on NCQDs–MgO nanostructure for
           solar photocatalysis and electrocatalytic water splitting

    • Abstract: Abstract In this research work, MgO-based solar efficient Fe2O3/NCQDs–MgO ternary photocatalyst was synthesized through a facile approach. The XRD results confirmed the presence of characteristic peaks of Fe2O3 and MgO nanomaterials. The NCQDs resulted in broadening of peaks which, thus, resulted in decreasing particle size. SEM showed a honeycomb-like structure for Fe2O3/NCQDs–MgO ternary nanocomposites. The HRTEM findings agreed well with XRD and SEM. The UV–Vis spectroscopy depicted a remarkable reduction of the band gap of MgO 5.39–2.44 eV in ternary composites enabling energies asserting enhanced photo response of MgO in the visible region. The vastly reduced PL intensity confirmed the minimized charge carrier recombination in Fe2O3/NCQDs–MgO ternary nanocomposites and enhance electronic transitions due to NCQDs. The fabricated ternary photocatalyst was applied for the sunlight-driven photocatalytic removal of Rhodamine B and for electrocatalytic water splitting. The composites with 2.0% Fe2O3 exhibited the highest degradation efficiency and improved activity towards HER and OER. The ternary composite showed a current density of 93 µA/cm2 for HER and a current density of 238µA/cm2 towards OER. The increased current density is evident through continuous cycles indicating good stability of the synthesized ternary catalyst. The developed nanocomposites are found fairly stable both for environmental detoxification and electrocatalytic water splitting.
      PubDate: 2022-06-01
       
  • Corrosion processes of silver nanoparticles

    • Abstract: Abstract The corrosion of silver nanoparticles (AgNPs) on exposure to ambient air was studied using imaging and analysis in the scanning transmission electron microscope (STEM). Secondary particles are formed on exposure to ambient air, and these are more numerous and more widely distributed as the relative humidity increases. Energy-dispersive X-ray analysis (EDS) confirms that the particles contain Ag and S. Electron energy loss spectra (EELS) in the valence part of the spectrum (< ~ 50 eV) identify the corrosion product as Ag2S on comparison with spectra from reference compounds. The EELS measurements also allow for a direct visualisation of the shift in the energy of the surface plasmon peak that occurs when the corrosion product is in contact with the particle. The experiments confirm that advanced electron microscopy methods have an important role in investigating corrosion of nanoparticulate systems.
      PubDate: 2022-06-01
       
  • Graphene nanoplatelets/CeO2 nanotiles nanocomposites as effective
           antibacterial material for multiple drug-resistant bacteria

    • Abstract: Abstract Antibacterial agents with low toxicity to normal cells, redox activity and free radical scavenging property are urgently needed to address the global health crisis. The phenomenal conducting nature of graphene is a best fit to enhance the antibacterial properties of metal oxides. In this work, CeO2 nanotiles and graphene nanoplatelets/CeO2 nanotiles nanocomposites (G/CeO2) have been synthesized by a solvothermal method. The prepared materials have been characterized using XRD, FE-SEM, EDX, and UV–visible spectroscopy techniques to investigate their crystallinity, morphology, composition, and optical bandgap energies. The CeO2 and G/CeO2 nanocomposites have also been tested for antibacterial applications. The neat CeO2 nanotiles sample inhibits the bacterial growth of Pseudomonas aeruginosa and Staphylococcus aureus up to 14.21% and 39.53% respectively. The antibacterial activity was tremendously enhanced using 25% graphene-loaded sample (G/CeO2-II) i.e., approximately 83% loss of P. aeruginosa and 89% in case of S. aureus has been observed. This can be attributed to the unique nano-architecture, oxidative stress due to the excellent ability of reversible conversion between the two electronic states of CeO2 and the stress exerted by the planar graphene and CeO2 nanotiles. Therefore, the G/CeO2 nanocomposites can find potential application as nano-antibiotics for controlling pathogens.
      PubDate: 2022-06-01
       
  • An experimental analysis of CTAB surfactant on thermo-physical properties
           and stability of MWCNT/water nanofluids

    • Abstract: Abstract To get the high thermal efficiency of heat transferring medium in various fluid heating and cooling industries, novel fluids are evolved constantly. Nanofluids with good thermo-physical properties and long term stability are preferred by researchers. In our work, multi-walled carbon nanotubes (MWCNT) as nanoparticles are taken into consideration due to its very high thermal conductivity (TC). For enhancing its stability in dispersion with water, a suitable surfactant such as cetyl trimethyl ammonium bromide (CTAB) is used. In this paper, a critical and in-depth evaluation of thermo-physical properties and stability of MWCNT/water nanofluids has been performed. In continuation to this, the effect of CTAB surfactant on different weight concentrations (0.01, 0.05, 0.1 and 0.3 wt%) of nanofluid samples at different temperatures (30–80 °C) was investigated. TC of nanofluids is enhanced with increase in temperature as well as nanofluid concentration. Maximum enhancement of 33.42% in TC is observed for 0.3 wt% at 80 °C compared to distilled water values. Viscosity of nanofluids is enhanced with nanofluid concentration and decreased with increase in temperature. Maximum enhancement of 64.32% in viscosity is observed for 0.3 wt% at 30 °C compared to distilled water. Highest decrement of 61.83% in viscosity is obtained for 0.3 wt% at 80 °C compared to viscosity at room temperature (at 30 °C). Experimentally measured values for TC and viscosity are also compared with values produced from standard theoretical models. Two correlations are proposed for TC and viscosity with having least margin of deviation (MOD) and maximum regression coefficient (R2) that proves accuracy. The effect of CTAB surfactant on both TC and viscosity are also assessed. The whole nature of nanofluid was totally changed from hydrophobic to hydrophilic, from less solubility in polar solvent (e.g., water) to high solubility and from low stability to very high stability after adding CTAB. Stability of surfacted nanofluid is far more increased beyond 6 months (except 0.01 wt%) compared to non-surfacted nanofluids which is 17 days only.
      PubDate: 2022-06-01
       
  • Green synthesis and characterization of CuO nanoparticles using Panicum
           sumatrense grains extract for biological applications

    • Abstract: Abstract There is a need for developing eco-friendly, cost-effective materials in medical, biological, and agricultural fields, now, the problem can be resolved using environment-friendly green approached metal oxide nanoparticles were used. Therefore, the CuO nanoparticles were biosynthesized using Panicum sumatrense grains aqueous extract for the first time. The gas chromatography–mass spectrometry analysis revealed the diethyl phthalate (99.18%) was the major active phytocompound in the grains extract. The biosynthesized CuO nanoparticles were characterized using various analytical techniques. The UV–visible spectrum revealed the surface Plasmon resonance band of CuO nanoparticles at 305 nm. X-ray diffraction pattern showed the high crystalline nature of nanoparticles and their mean crystallite size was at 25 nm. Fourier transform infra-red spectrum exposed the Cu–O stretching vibrational bands at 830 and 510 cm−1. The high resolution transmission electron micrographs illustrated the cluster of rectangular shaped nanoparticles and their average particle size was in between 15 and 35 nm. The energy dispersive spectrum and mapping analyses showed the major presence of Cu and O in nanoparticles. The antibacterial activity and its SEM images revealed the bactericidal characteristics of CuO nanoparticles against Salmonella typhi and Staphylococcus aureus bacteria at 150 μg/mL concentration. The maximum zone of inhibition of nanoparticles against S. typhi and S. aureus bacterial cells were 22 and 26 mm, respectively. The antioxidant, anti-inflammatory, and anti-diabetic analyses indicated the effectual biological activities at 98.25, 92.65, and 89.10% in 80 μg/mL concentration of CuO nanoparticles, respectively. The morphological and tissue changes in Culex tritaeniorhynchus mosquito larvae and Tribolium castaneum insect revealed the effective larvicidal and insecticidal activity of CuO nanoparticles. The maximum mortality of larvae and insect by CuO nanoparticles were 100 ppm at 48 h and 100 μg/Kg at 48, 72 h, 75 μg/Kg at 72 h, respectively. The anticancer activity divulged the effectual inhibition (95.69%) of CuO nanoparticles against MCF-7 breast cancer cells in low IC50 value at 11.49 μg/mL. The activity against L929 (fibroblast) normal cells showed non-toxicity of CuO nanoparticles to normal cells. The plant growth analysis explained the efficient growth of Vigna mungo plant at 60 ppm concentration of CuO nanoparticles. As per the results, the synthesized CuO nanoparticles can be applied as a biocompatible, cost-effective insecticides, drugs and fertilizers.
      PubDate: 2022-06-01
       
  • Basic physiology of Pseudomonas aeruginosa contacted with carbon
           nanocomposites

    • Abstract: Abstract Experiments describing properties of nanomaterials on bacteria are frequently limited to the disk diffusion method or other end-point methods indicating viability or survival rate in plate count assay. Such experimental design does not show the dynamic changes in bacterial physiology, mainly when performed on reference microorganisms (Escherichia coli and Staphylococcus aureus). Testing other microorganisms, such as Pseudomonas aeruginosa, could provide novel insights into the microbial response to nanomaterials. Therefore, we aimed to test selected carbon nanomaterials and their components in a series of experiments describing the basic physiology of P. aeruginosa. Concentrations ranging from 15.625 to 1000 µg/mL were tested. The optical density of cultures, pigment production, respiration, growth curve analysis, and biofilming were tested. The results confirmed variability in the response of P. aeruginosa to tested nanostructures, depending on their concentration. The co-incubation with the nanostructures (in concentration 125 µg/mL) could inhibit the population growth (in most cases) or promote it in the case of graphene oxide. Furthermore, a specific concentration of a given nanomaterial could cause contradictory effects leading to stimulation or inhibition of pigmentation, an optical density of the cultures, or biofilm formation. We have found that particularly nanomaterials containing TiO2 could induce pigmentation in P. aeruginosa, which indicates the possibility of increased virulence. On the other hand, nanocomposites containing cobalt nanoparticles had the highest anti-bacterial potential when cobalt was displayed on the surface. Our approach revealed changes in respiration and growth dynamics that can be used to search for nanomaterials’ application in biotechnology.
      PubDate: 2022-06-01
       
  • Effect of graphene-based nanofluid on heat transfer performance of
           alternate elliptical axis oval tube heat exchanger

    • Abstract: Abstract The comparative heat transfer analysis of alternative elliptical axis oval tube (AEAOT) carrying graphene/water-based nanofluids at various volumetric concentrations and operating conditions has been done. The investigation pertains to Reynolds number range, i.e., 100–2000 in AEAOT tube heat exchanger and the inlet temperature of nanofluid is varied from 40 to 70 °C. The outer pipe is allowed to flow water, inner pipe (AEAOT) carries nanofluid at different volumetric concentrations (0.02%, 0.04%, 0.06%, 0.08%, and 0.1%), and heat exchanger is subjected to both parallel and counter flow arrangements. The effect of pertinent parameters such as mass flow rate and fluid temperature on the performance of the AEAOT heat exchanger has been studied through numerical investigations. The presence of alternate oval tube enhances the axial vortices resulting in improving the heat transfer performance. Overall heat transfer coefficient is higher for counterflow arrangement, approximately 4.5% more than parallel flow. Moreover, the estimated non-dimensional heat transfer enhancement factor for parallel and counter is in the range of 2.68–2.17 to 2.59–2.06. It is concluded that heat transfer enhancement can be achieved with low concentrations of nanoparticles to avoid excessive pumping requirements in AEAOT heat exchanger.
      PubDate: 2022-06-01
       
  • COD adsorption and optimization from produced water using
           chitosan–ZnO nanocomposite

    • Abstract: Abstract In this study, chitosan/ZnO nanocomposite was synthesized and employed for the first time as a selective adsorbent in produced water (PW) for the chemical oxygen demand (COD). Physical characteristics were studied using XRD, SEM, FTIR, BET, TGA, and XPS. Results showed that ZnO nanoparticles mobilized onto chitosan. The COD adsorption followed Langmuir isotherm with maximum monolayer adsorption. With a high coefficient of determination (0.98), COD adsorption followed the pseudo-second-order kinetics model. Furthermore, central composite design (CCD) in response surface methodology (RSM) was employed to assess different parameters’ impact on COD adsorption. The parameters analyzed contain; solution pH, nanocomposite dose, and contact time. The COD removal efficiency was reported to be as high as 94.56%. The experimental results were in good accord with the model’s predictions, demonstrating the value of the RSM technique in terms of optimization. Based on the present findings, it is possible to conclude that chitosan/ZnO nanocomposite, as a biocompatible, environmentally benign, and cost-effective material, can be a viable option for adsorption of organic pollutants and a way forward to a sustainable environment.
      PubDate: 2022-06-01
       
  • Engineering of ultrasound contracts agents-focused cabazitaxel-loaded
           microbubbles nanomaterials induces cell proliferation and enhancing
           apoptosis in cancer cells

    • Abstract: Abstract Tumour-induced sentinel lymph node diagnosis and metastatic therapeutic techniques are limited by current strategies nowadays. Herein, we combined iron oxide nanomaterials with chemotherapy drugs in poly(lactic-co-glycolic acid) multifunctional microbubbles (MMBs) to develop and visualize tumour lymph node treatment. Fabrication and loading of perfluorocarbon gas-filled PLGA microbubbles with co-encapsulated cabazitaxel (CTX) and Fe3O4 nanomaterials were accomplished. Ultrasound (US) imaging enhancement and US-induced drug delivery have been investigated in vitro and in vivo to improve the outcomes. The MMBs had a mean size of 881.45 ± 70.19 nm, with a narrow size dispersion and a smooth surface. It was also shown that the amount of Fe3O4 nanomaterials in the MBs did not affect the CTX drug loading efficiency or encapsulation. Our outcomes showed that these MMBs could improve ultrasound imaging in vitro and in vivo and improve tumour lymph node signals. Biomarkers of tumour proliferation profile and micro blood/lymphatic vessel density were used to assess the anti-tumour efficacy of MMBs-mediated chemotherapy in vivo. These markers were consistently lower after MMBs + sonication treatment than controls. The tumour cell apoptosis index was shown to be highest following MMBs plus sonication treatment, which is in line with this finding. A cabazitaxel-loaded PLGA-Fe3O4 nanomaterials therapeutic and diagnostic agent for low-frequency US-triggered US imaging of the lymph node metastasis has been developed successfully. It may provide an approach for the chemotherapy and imaging of primary metastasis tumours.
      PubDate: 2022-06-01
       
  • Study of electronic and optical properties of quantum dots

    • Abstract: Abstract Shape-dependent electronic and optical properties of quantum dots (QD’s) have been simulated using the particle in a box concept and solving 3D Schrodinger equation by employing Quantum Dot Lab Software. Effect of the shape of equal sized QDs on its optical properties like absorption and its dependency on the incident angle of light and temperature of surroundings is largely unexplored. Isovolumic calculations of energy states of GaAs and InP QDs were carried out for different geometrical shapes. Out of various shapes considered, those with cylindrical shape were found to possess high energy eigenstates whereas cuboid shape associated themselves with the lowest energy eigenstates. However, with an increase in their volume, the value of corresponding energy eigenstates decreased in consonance with the other findings. Optical absorption properties of these systems were also studied as a function of temperature and incident angle of polarization in ‘temperature sweeping’ mode and ‘angle sweeping’ mode, respectively. The percentage increase in absorption was found to be largest for InP cuboid-shaped QDs. And also independent of any change in the incident angle. Our findings are very significant in increasing the efficiency of solar cells and improving the performance of optoelectronic devices such as lasers and photodetectors.
      PubDate: 2022-05-16
       
  • Cattaneo–Christov-based study of AL2O3–Cu/EG Casson hybrid nanofluid
           flow past a lubricated surface with cross diffusion and thermal
           radiation

    • Abstract: Abstract Casson fluid possesses yield stress and has great importance in biomechanics and polymer processing industries. In the present study, a mathematical model is presented to Cattaneo–Christov-based study on the heat and mass transfer, as well as entropy generation analysis of a thermal system in the presence of the Casson hybrid nanofluid over lubricated surfaces at a stagnation point. A power-law (shear-thinning) fluid is utilized for lubrication. Implementing the continuity of velocity and shear stress of Casson and power-law fluids creates interfacial conditions. We also incorporated thermal radiation effects and a uniform transverse magnetic field in the present study. The similarity techniques are used to reduce the governing nonlinear partial differential equation to a set of the ordinary differential equation. For the numerical solution of the considered problem, we have used MATLAB-based Bvp4c method. The results are presented for hybrid alumina-copper/ethylene glycol (Al2O3–Cu/EG) nanofluid. The computed results are original, and it has been noticed that the present results have excellent agreement with the results of the previous extending literature. It has been observed that the Nusselt number or heat transfer rate of hybrid nanofluid flow is better as compared to nanofluid flow.
      PubDate: 2022-05-16
       
  • Highly efficient removal of malachite green from water by ZnO/NiO/CeO2
           nanocomposite

    • Abstract: Abstract In this study, a kind of ZnO/NiO/CeO2 nanocomposite constructed by solution method was adopted to remove malachite green (MG) dye from water. The nanocomposite was characterized by Zeta potential, SEM, TEM, FTIR, XRD, XPS and BET analysis. The results indicate that ZnO/NiO/CeO2 has hierarchical porous structure containing micropores, mesopores and macropores. Through the study of the adsorption process, the adsorption performance of ZnO/NiO/CeO2 was evaluated systematically. The adsorption conditions such as initial concentration of dye, pH value and adsorption time were considered, and the equilibrium adsorption and kinetic were described by different isotherm and kinetics models. We demonstrate that ZnO/NiO/CeO2 composite displays preferential adsorption performance to cationic dye MG with great adsorption capacity of 7600 mg g−1. The ZnO/NiO/CeO2 nanocomposite displays highest removal rate when pH is 7, with adsorption time of 60 min at room temperature. The pseudo-second-order kinetic and Langmuir isothermal models are well applied to the adsorption process of MG on ZnO/NiO/CeO2. The adsorbent can be recycled for four times and maintain good adsorption performance all the time.
      PubDate: 2022-05-14
       
  • Fabrication of a novel nano-biosensor for efficient colorimetric
           determination of uric acid

    • Abstract: Abstract In this study, a novel nano-biosensor for uric acid detection has been designed and fabricated by embedding uricase into a copper nanozyme, which possessed outstanding peroxidase-like activity and could efficiently mimic horseradish peroxidase (HRP). After optimizing the preparation conditions and characterization, we successfully applied the nano-biosensor to detect uric acid levels. The equation of linear regression was prescribed as y = 0.0064x + 0.3299, while its correlation coefficient is 0.9886. The colorimetric sensor exhibited a linear response range over 1–50 μM and a relatively low limit of detection (LOD) of 0.6 µM. The nano-biosensor has the advantages of easy preparation, good reusability and excellent storage stability, while this one-step colorimetric method is simple to be operated and has high selectivity for detection of the uric acid levels in actual human samples.
      PubDate: 2022-05-12
       
 
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