Subjects -> METALLURGY (Total: 58 journals)
Showing 1 - 10 of 10 Journals sorted alphabetically
Acta Metallurgica Slovaca     Open Access  
Advanced Device Materials     Open Access   (Followers: 3)
American Journal of Fluid Dynamics     Open Access   (Followers: 48)
Archives of Metallurgy and Materials     Open Access   (Followers: 9)
Asian Journal of Materials Science     Open Access   (Followers: 5)
Canadian Metallurgical Quarterly     Hybrid Journal   (Followers: 20)
Complex Metals     Open Access   (Followers: 2)
Corrosion Communications     Open Access  
Energy Materials : Materials Science and Engineering for Energy Systems     Hybrid Journal   (Followers: 19)
Handbook of Magnetic Materials     Full-text available via subscription   (Followers: 2)
Indian Journal of Engineering and Materials Sciences (IJEMS)     Open Access   (Followers: 10)
International Journal of Metallurgy and Alloys     Full-text available via subscription   (Followers: 3)
International Journal of Metals     Open Access   (Followers: 6)
International Journal of Minerals, Metallurgy, and Materials     Hybrid Journal   (Followers: 8)
International Journal of Mining and Geo-Engineering     Open Access  
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 4)
ISIJ International - Iron and Steel Institute of Japan     Full-text available via subscription   (Followers: 23)
JOM Journal of the Minerals, Metals and Materials Society     Hybrid Journal   (Followers: 32)
Journal of Advanced Joining Processes     Open Access   (Followers: 1)
Journal of Central South University     Hybrid Journal   (Followers: 1)
Journal of Cluster Science     Hybrid Journal  
Journal of Iron and Steel Research International     Hybrid Journal   (Followers: 7)
Journal of Materials & Metallurgical Engineering     Full-text available via subscription   (Followers: 1)
Journal of Materials Processing Technology     Hybrid Journal   (Followers: 19)
Journal of Metallurgical Engineering     Open Access   (Followers: 2)
Journal of Sustainable Metallurgy     Hybrid Journal   (Followers: 3)
Materials Science and Metallurgy Engineering     Open Access   (Followers: 7)
Metallurgical and Materials Engineering     Open Access  
Metallurgical and Materials Transactions A     Hybrid Journal   (Followers: 41)
Metallurgical and Materials Transactions B     Hybrid Journal   (Followers: 30)
Metallurgical and Materials Transactions E     Full-text available via subscription   (Followers: 2)
Metallurgical Research & Technology     Full-text available via subscription  
Metallurgical Research and Technology     Full-text available via subscription   (Followers: 6)
Metallurgy and Foundry Engineering     Open Access   (Followers: 1)
Mining, Metallurgy & Exploration     Hybrid Journal  
Powder Diffraction     Full-text available via subscription   (Followers: 1)
Powder Metallurgy     Hybrid Journal   (Followers: 33)
Powder Metallurgy and Metal Ceramics     Hybrid Journal   (Followers: 7)
Powder Metallurgy Progress     Open Access   (Followers: 5)
Rare Metals     Hybrid Journal   (Followers: 2)
Revista de Metalurgia     Open Access  
Revista del Instituto de Investigación de la Facultad de Ingeniería Geológica, Minera, Metalurgica y Geográfica     Open Access  
Revista Remetallica     Open Access  
Russian Metallurgy (Metally)     Full-text available via subscription   (Followers: 4)
Science and Technology of Welding and Joining     Hybrid Journal   (Followers: 4)
Soldering & Surface Mount Technology     Hybrid Journal   (Followers: 1)
Stainless Steel World     Full-text available via subscription   (Followers: 17)
Transactions of the IMF     Hybrid Journal   (Followers: 14)
Transactions of the Indian Institute of Metals     Hybrid Journal   (Followers: 4)
Tungsten     Hybrid Journal  
Universal Journal of Materials Science     Open Access   (Followers: 1)
Welding in the World     Hybrid Journal   (Followers: 4)
Welding International     Hybrid Journal   (Followers: 7)
Вісник Приазовського Державного Технічного Університету. Серія: Технічні науки     Open Access  
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Journal of Cluster Science
Journal Prestige (SJR): 0.332
Citation Impact (citeScore): 1
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1572-8862 - ISSN (Online) 1040-7278
Published by Springer-Verlag Homepage  [2469 journals]
  • Hollow Multicomponent Capsules for Biomedical Applications: A
           Comprehensive Review

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      Abstract: Hollow capsules with multi-shelled or multicomponent structures are essential materials for various applications. Biomedical applications like disease diagnosis, therapy, and monitoring have special significance as they aim to improve health conditions. This review demonstrated a comprehensive overview of hollow, multifunctional structures incorporating meaningful use of nanotechnology and its’ unique prospects in medicine such as patient-specific treatment, multimodal imaging, multimodal therapy, simultaneous delivery of drugs and imaging probes, and actively targeted delivery. The internal hollow cavity provides safe and controlled drug release while also enabling transport of functional moieties to target sites. This review explored the performance of different organic, inorganic, and metallic multicomponent capsules that have been reported for biomedical applications, mainly diagnostic imaging and drug delivery. Material compositions, morphologies, and synthesis strategies involved in fabricating such multifunctional systems have been discussed in detail. It is expected that with time, more sophisticated and precise systems will come to light as the outcome of ongoing concentrated research efforts.
      PubDate: 2022-05-18
       
  • A Unique Cd4-Cluster-Based Coordination Polymer with Efficient Luminescent
           Detection of 2,4,6-Trinitrophenol and MnO4−

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      Abstract: 2,4,6-Trinitrophenol (TNP) and MnO4− have potential threats to human and microorganisms. Therefore, it is essential to develop efficient methods to detect TNP and MnO4−. Herein, a unique [Cd4(COO)8]-cluster-based coordination polymer, namely [Cd2(3-L)(ISO)2]n (1) (3-L = 3,3′-((9H-fluoren-9-ylidene)-methylene)dipyridine; H2ISO = isophthalic acid), is constructed by two rigid angular functional organic ligands. Two Cd1 and two Cd2 are associated together via eight carboxylic groups from eight ISO2− to form a rare [Cd4(COO)8] cluster unit. The [Cd4(COO)8] cluster units link with each other by two 3-L and four ISO2− bridges to generate a one-dimensional (1D) chain architecture, which contains a cavity structure and a rhombus channel. 1 has good water and thermal stabilities. Luminescence sensing experiments exhibit that 1 can highly sensitively and selectively detect TNP and MnO4− in H2O medium. The detection mechanisms of 1 towards TNP and MnO4− have been discussed. These experimental results suggest that 1 should be a promising sensor for TNP and MnO4−.
      PubDate: 2022-05-17
       
  • Boron Cluster Anion [B12H12]2– in Zinc(II) and Cadmium(II) Complexation
           at the Presence of N-Donor Heterocyclic Ligands

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      Abstract: Zinc(II) and cadmium(II) complexation with the dodecahydrido-closo-dodecaborate anion [B12H12]2– in the presence of benzimidazole ligands 1-methylbenzimidazo-2-yl-methyleneaniline (L1) and 1-ethyl-2-(4-methoxyphenyl)azobenzimidazole (L2) was studied. A number of Zn(II) and Cd(II) complexes with the [B12H12]2– anion and ligands L1 or L2 were obtained and characterized. Effect of the metal nature on the composition and structure of the resulting compounds was determined. Only tris-chelate zinc(II) complexes with the [B12H12]2– anion were isolated. For cadmium, first examples of mixed-ligand complexes with the [B12H12]2– anion coordinated by the metal atom via 3c2e (CdHB) bonds were isolated. Structures of complexes [Zn(L1)3][B12H12]·2CH3CN, [Cd(L1)2[B12H12]]·2CH3CN and [Cd(L2)2(CH3CN)[B12H12]]·CH3CN were determined by X-ray diffraction. Graphical
      PubDate: 2022-05-16
       
  • Fabrication of Hyaluronic Acid Surface Modified Solid Lipid Nanoparticles
           Loaded with Imatinib Mesylate for Targeting Human Breast Cancer MCF-7
           Cells

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      Abstract: Targeted chemotherapies offer a great potential advantage due to their ability to enhance specificity to deliver high doses directly to the target site. Solid lipid nanoparticles (SLNs) of imatinib mesylate (IM) were formulated by high shear homogenization and probe sonication using glyceryl palmitostearate (GP) as lipid carrier and quillaja saponin (QS) as surfactant. Additionally, the SLNs were coated with hyaluronic acid (HA) to enhance specificity towards cancerous cells. The prepared SLNs were characterized for particle size, zeta potential, surface morphology, entrapment efficiency, in vitro release, and cytotoxicity. The least particle size of 92.1 ± 2.41 nm was observed for HA surface-modified SLNs of IM. As IM is a hydrophilic drug, the entrapment efficiencies of the formulations were low, with a maximum of 65.9 ± 0.6%, and in vitro release studies performed using phosphate buffer saline indicated that 100% of the drug was released in 10 h. The cytotoxicity and apoptosis studies of the free IM and its encapsulated form in SLNs, and HA-coated SLNs evaluated in MCF-7 breast cancer cell line suggested a synergistic effect.
      PubDate: 2022-05-09
       
  • Tunable Assembly and Magnetic Interactions in Two Cyano-bridged
           FeIII–CoII Bimetallic Complexes

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      Abstract: Using a new semi-rigid tetradentate ligand and two cyanometalate building blocks with different steric hindrance, a Fe2Co triangular unit [(Tp)FeIII(CN)3]2CoII(bpmb)·2H2O [1; Tp = hydrotris(pyrazolyl)borate; bpmb = 1,2-bis(3-(2-pyridyl)pyrazol-1-ylmethyl)benzenes] and a Fe2Co2 square unit {[(pzTp)FeIII(CN)3]2[CoII(bpmb)]2}·[(pzTp)FeIII(CN)3]2·4H2O [2; pzTp = tetrakis(pyrazolyl)borate] were synthesized via tunable assembly. Both compounds adopt cis arrangement because of the structural distorted semi-rigid bpmb. Tetranuclear square of 2 was formed due to larger steric hindrance building block of [(pzTp)FeIII(CN)3]− compared with [(Tp)FeIII(CN)3]− in trinculear 1. Magnetic measurements show that antiferromagnetic interactions dominate in 1 and 2. The fitting results of J values suggest a positive correlation between magnetic orbitals overlap of FeIII and CoII ions and Co–N≡C bond angles. Graphical Two cis arrangement cyanometalate [Fe-Co] clusters were synthesized via tunable assembly with a new semi-rigid tetradentate ligand. The tetranuclear cluster was formed because of larger steric hindrance of pzTp. Both compounds exhibit dominant antiferromagnetic couplings. The fitting results of J values suggest a positive correlation between magnetic orbitals overlap of FeIII and CoII ions and Co–N≡C bond angles.
      PubDate: 2022-05-07
       
  • Structure and Electronic Properties of Neutral and Anionic X-Doped
           Medium-Sized Mg16 (X = Co, Fe, Ni) Clusters

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      Abstract: Projects about magnesium-based doped of transition metal have constantly attracted much attention in cluster science, while the research of Co, Fe, Ni doped Mid-Sized Mg16 clusters has not been reported. Here, the geometric construction and electronic properties of neutral and negative Mg16X (X = Co, Fe, Ni) clusters were researched by unbiased CALYPSO structure search codes and subsequent DFT calculations at the B3PW91 level. The results show that Fe and Co atoms are more likely to replace the central bits of the caged Mg170/− cluster, but the excellent and stable configuration of the Mg170/− cluster is perfectly maintained. Simultaneously, the doping of Co and Fe can cause the cluster to produce the corresponding magnetic moment. The caged Mg16Co− clusters with a central Co atom have good binding energy, local charge transfer and HOMO–LUMO gap according to stability analysis, which indicates that Mg16Co− clusters has better relative stability. In addition, it is found that there is an intense interaction between Mg-3s, p and Co-3d AO (molecular orbitals) through the analysis of molecular orbitals and adaptive natural density partitioning (AdNDP), which may be the main reason for the high stability of Mg16Co− clusters.
      PubDate: 2022-05-05
       
  • What is Alanine Hippurate, In Fact'

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      Abstract: In this critical comment, we prove that a recently published paper titled, “Fabrication, Characterization and Optical Investigation of Semi-organic Nonlinear Alanine Hippurate Single Crystals” (Akilandeswari et al J Clust Sci 33, 439–448, 2022) is completely erroneous. A so-called “alanine hippurate” is, in fact, hippuric acid.
      PubDate: 2022-05-04
       
  • A Condensed Excited (Rydberg) Matter: Perspective and Applications

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      Abstract: A condensed excited matter called Rydberg Matter (RM) have been studied experimentally for 30 years, but have not sparked widespread attention yet, unlike ordinary Rydberg atoms. RM formed by clusters of Rydberg atoms at a solid surface have a longer lifetime compared to Rydberg atoms, and is liquid-like. This review describes how the RM state is generated, and its potential applications. These include using RM for research into catalysis, space phenomena and sensor applications, or for producing environmentally friendly energy. A background on RM is presented, with its structure and special properties, and the working principle of RM generation. The experimental set-ups, materials, and detectors used are discussed, together with methods to improve the amount of RM produced. The materials used for the catalysts are of special interest, as this should have a large influence on the energy of the RM, and therefore also on the applications. Currently most of the catalysts used are potassium doped iron oxide designed for styrene production, which should give the possibility of improvements. And as there is little knowledge on the exact mechanisms for RM formation, suggestions are given as to where research should start.
      PubDate: 2022-05-01
       
  • Latex/AgNPs: Synthesis, and Their Antibacterial Activity

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      Abstract: Silver nanoparticles (Ag NPs) coated by an aqueous emulsion of copolymer were elaborated in a short time using polyol process and microwave (MW) heating. This approach is based on reducing AgNO3 powder in the presence of two main components; ethylene glycol as a dispersed medium and an industrial copolymer (latex) as protecting agent. The structural, morphological and optical properties of the prepared silver nanoparticles have been investigated by UV–Vis spectroscopy, Infrared Spectroscopy (IR), X Ray Diffraction (XRD) and Transmission Electron Microscopy (TEM). It was found that all these properties are strongly correlated to the latex copolymer concentration and the MW heating process. The absorption band was determined by UV Visible spectra, showing several bands (localized surface Plasmon band) in the visible region at wavelengths between 410 and 430 nm. The TEM analysis of the obtained products indicates the presence of straight nanowires and dispersed, spherical silver nanoparticles with well-controlled size ranging from 7 to 20 nm. The X Ray Diffraction showed that silver nanoparticles synthesized exhibit face centered cubic (fcc) structure. The infrared spectra show the strong coordination between the surface of silver particles and molecules of latex by O–H and C=O groups. Antimicrobial activity of latex/Ag NPs against E. coli, Staphylococcus aureus, and Pseudomonas aeruginosa has been also demonstrated. The results indicated that latex/AgNPs may damage the structure of bacterial cell membrane.
      PubDate: 2022-05-01
       
  • Green Synthesis of Gold Nanoparticles (AuNPs) As Potential Drug Carrier
           for Treatment and Care of Cardiac Hypertrophy Agents

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      Abstract: Owing to their autocatalytic properties, gold nanoparticles (AuNPs) are used in biomedical applications. While their usage in neurodegenerative disease control, diabetes, etc. has been documented, their function is mostly untapped in cardiovascular disease treatment. Hence, in this work is the leading to combine, classify and test cardiomyoblast hypertrophy efficiency of AuNPs. In the case of AuNPs, the Imperata cylindrica extracts (IPC) and gold solution (HAuCl4) were fabricated with 1:5 volume ratios and were distinguished by specific processes, such as ultraviolet–visible (UV–vis) spectroscopy, scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). The radical scavenging of superoxide and hydroxylic AuNPs has been shown to be stronger relative to bulk gold and extracts. In cell line tests, rat cardiomyoblasts H9c2 and 3T3 fluorescence were used in this work. The generation of intracellular superoxide anion was less due to the incubation of greater AuNPs levels. In addition, preliminary findings gave an insight into the role of AuNPs in attenuating cardiomyoblastic induced isoproterenol hypertrophy.
      PubDate: 2022-05-01
       
  • Structural Diversity of Co(II) Coordination Polymers: Treatment Activity
           on Hypotension During Surgery by Blocking α Receptor on Peripheral Blood
           Vessels

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      Abstract: Two Co(II)-based coordination polymers (CPs) with the molecular formulae of [Co4(5-mtz)4(l-mal)2(H2O)2]n (1, 5-mtz = 5-methyltetrazole, L-mal = L-malic acid) and {[Co8(S-mal)4(bptc)(H2O)12]·0.5H4bptc·7.5H2O}n (2, S-mal = S-malic acid, H4bptc = biphenyl-3,3′,5,5′-tetracarboxylic acid) were synthesized under a hydrothermal or solvothermal surrounding. The prepared two complexes have been determined through the powder and single crystal X-ray diffraction, thermogravimetric (TG) analyses and IR spectroscopy. To prevent the hypotension during surgery after injected with anesthetic, their biological activity was estimated in this research. The CCK-8 (Cell Counting Kit-8) assay was performed to measure the viability of the HUVEC cells after compounds treatment. The relative expression of the α receptor was evaluated by real time RT-PCR (reverse transcription-polymerase chain reaction). Besides, the blood pressure was measured as well.
      PubDate: 2022-05-01
       
  • (C5H9N2)[BiI4]: A One-Dimensional Bismuth-Based Organic–Inorganic Hybrid
           Material for Fast Rhodamine B Degradation Under Dark Condition

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      Abstract: Lead-free organic–inorganic hybrid materials have attracted wide interest due to their excellent optoelectronic and photovoltaic properties. Herein, we synthesized a Bi-based hybrid material with one-dimensional (1D) Bi-I anionic chains, namely, (C5H9N2)[BiI4] (1) by solvothermal method. Single-crystal X-ray diffraction analysis reveals that it crystallizes in monoclinic space group of C2/c with the cell parameters a = 15.539(13) Å, b = 13.860(12) Å, c = 7.789(6) Å, β = 117.02(2)o, V = 1494(2) Å3, and Z = 4, which is composed of protonated 1,3-dimethylimidazolium cations and one-dimensional (1D) [BiI4]∞− chains interconnected via edge-sharing μ2-I. This compound exhibits fast degradation of rhodamine B (RhB) at room temperature under dark condition.
      PubDate: 2022-05-01
       
  • Decrypting the Structural, Electronic and Spectroscopic Properties of
           GeMgn+(n = 2–12) Clusters: A DFT Study

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      Abstract: A detailed comprehensive theoretical study on the structures, electronic and spectroscopic properties of GeMgn+ (n = 2–12) clusters has been reported through CALYPSO program together with density functional theory (DFT). It is shown that the geometrical growth patterns of the ground state GeMgn+ clusters are tetrahedral-based in the size range of n from 5 to 7 and tent-based geometry at n = 8–12. GeMg8+ is found to has robust local stability and thus can be identified as a magic cluster. Charge transfer analysis indicates that germanium atoms are electron receivers in all clusters, while magnesium atoms are electron donors. Finally, the GeMg8+ has been further studied, including the relationship between its chemical bond properties and stability, infrared and Raman spectra.
      PubDate: 2022-05-01
       
  • Facet-Guiding Deposition of Size-Selected Au Cluster Size on MgO Cube

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      Abstract: The size-selected Au (923 ± 23 atoms) cluster soft-landed on amorphous carbon and MgO(100) surface were imaged by transmission electron microscope (TEM) and aberration-corrected scanning transmission electron microscopy (AC-STEM). Au923 clusters presents multiplicity geometries on amorphous carbon and epitaxial relationship with MgO(100) surface. It is found that there is a projected size of Au923 clusters shrinking when landed on the MgO surface. This is due to the limited observation direction caused by the epitaxial relationship between the facet of Au923 clusters and Mg(100) lattice. This study highlights the different observation direction of electron microscopy images of clusters can result in the change of projected area. Such visual size changes can not be neglected in the cluster studies at atomic resolution.
      PubDate: 2022-05-01
       
  • Multiple Applications of CdS/TiO2 Nanocomposites Synthesized via
           Microwave-Assisted Sol–Gel

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      Abstract: A novel multi-functional CdS/TiO2 nanocomposite was synthesized by using a wet impregnation method and microwave-assisted sol–gel anatase TiO2. A hydrothermal approach was used to prepare TiO2 nanowire then decorated with CdS-NPs. XRD, FTIR, HRTEM, FE-SEM, EDX, XPS, and optical properties were exploited to investigate their characteristics. A 0.05 M CdS/TiO2 showed high degradation efficiency toward methylene blue dye using UV–Vis light. The degradations were 95.46, 88.94, and 54.86% for CdS/TiO2, TiO2-NWs, and CdS-NPs, respectively. Different parameters that affect the degradation process were studied. Antibacterial activity of nanocomposites was carried out against pathogenic bacteria using diffusion methods. The hybrid nanocomposite CdS/TiO2 also showed larvicidal activity against Culex pipiens.
      PubDate: 2022-05-01
       
  • New Mg(II) and Ca(II) Mixed Strontium Squarates: Structural
           Characterization, DNA/BSA Interaction, Antioxidant and Anticancer
           Activities

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      Abstract: New mixed alkaline earth metal squarates, viz [Sr0.965Mg0.035(C4O4)(H2O)2]·H2O—(1) and [Sr0.88Ca0.12(C4O4)(H2O)3]—(2) have been synthesized and characterized by single-crystal X-ray diffraction, thermal analysis, and biological studies, EB-CTDNA binding, BSA binding, antioxidant and cytotoxicity activity. The complexes 1 and 2 crystallized in triclinic and monoclinic space groups with eight and nine coordination number, respectively, from the reaction mixture of squaric acid and the respective metal nitrates in aqueous medium at pH 7. The complexes on thermal analysis show that they yield mixed metal carbonates at 544 °C as residue. Their interaction with EB-CTDNA evaluated by emission method substantiates the intercalative mode of binding. The protein binding (BSA) study by the fluorescence quenching method reveals that the complexes bind strongly with BSA. Antioxidant property analysis shows that they exhibit a strong radical scavenging ability against ABTS, DPPH and NO radicals. The in vitro cytotoxicity of the complexes examined for human breast cancer (MCF-7) and lung cancer (A549) cell lines exhibit substantial cytotoxic property. AO/EB and DAPI staining methods support that they induce apoptosis and nuclear fragmentations in MCF-7 and A549 cell lines.
      PubDate: 2022-05-01
       
  • CuFe2O4@Ag Nanocomposite Synthesized in the Presence of Spirulina
           platensis Decreases the Expression of norB Gene in Staphylococcus aureus

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      Abstract: Due to the increasing multi-drug resistance, infections caused by Staphylococcus aureus is regarded as an important health threat. Extrusion of drugs by multidrug efflux pumps plays a crucial role in development of multi-drug resistance among bacteria. Resistance to fluoroquinolones, can be mediated by efflux pumps including NorA, NorB and NorC. Thus, efflux pumps inhibition has been considered to improve efficacy of fluoroquinolones. Metal nanoparticles have been tested for antibacterial and anticancer potentials. Among them, magnetic nanoparticles including ferrite based nanoparticles gained attention for their recyclability and site directed drug delivery potential. Due to the limitations associated to physio-chemical synthesis of these nanoparticles, green synthesis of nanoparticles using living organisms has gained interests. Here, we synthesized the CuFe2O4@Ag using Spirulina platensis and investigated its effect on expression of norB gene among S. aureus strains. Synthesized nanocomposite was characterized using Fourier transform infrared spectroscopy, transmission electron microscopy, scanning electron microscope, X-ray diffraction and Energy dispersive X-ray mapping analysis. Chemical analysis of S. platensis extract was done by gas chromatography–mass spectrometry analysis. The minimum inhibitory concentration of the nanocomposite in combination with ciprofloxacin was assessed by broth microdilution method and expression of norB gene was evaluated using qualitative real time polymerase chain reaction. The physico-chemical analysis of biosynthesized nanocomposite confirmed the well-dispersed and nanoscale of CuFe2O4@Ag. Also, the results demonstrated that the CuFe2O4@Ag combined with ciprofloxacin increased the efficacy of the drug and reduced expression of norB by 57–69%. Therefore, CuFe2O4@Ag has promising potential for reduction of norB gene and can improve the efficacy of antibacterial drugs.
      PubDate: 2022-05-01
       
  • Structures and Energetics of Elemental Sulfur in Hydrogen Sulfide

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      Abstract: Severe safety concerns arise from sulfur deposition that occurs frequently in the development of high sulfur-content natural gas formation. Solubility reduction of elemental sulfur in H2S is the main reason of sulfur deposition. To understand how elemental sulfur, which exists in the form of sulfur clusters (Sn), interacts with H2S, quantum chemistry calculations are performed to study the structures and thermodynamic properties of Sn–H2S complexes. Weak interaction resulting mainly from intermolecular sulfur–sulfur interaction is revealed for these complexes. The complexes formed by S4, S6 and S8 have similar binding energies that are relatively higher than that of S2–H2S. Because of their small binding energies and Gibbs free energies, these complexes may coexist in formation, but are however easily decomposed or formed depending on stratigraphic or pipeline conditions. Our calculations reveal the status of elemental sulfur in H2S, which is useful for subsequent predictions on sulfur solubility and sulfur deposition in high sulfur-content natural gas formation.
      PubDate: 2022-05-01
       
  • Fine Ultra-small Ruthenium Oxide Nanoparticle Synthesis by Using
           Catharanthus roseus and Moringa oleifera Leaf Extracts and Their Efficacy
           Towards In Vitro Assays, Antimicrobial Activity and Catalytic: Adsorption
           Kinetic Studies Using Methylene Blue Dye

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      Abstract: A simple one step green procedure is intended to investigate for the first time by employing ruthenium oxide nanoparticles (RuO2 NPs) derived from Catharanthus roseus (CR) and Moringa oleifera (MO) leaves and evaluate their catalytic—degradation of MB dye, antibacterial screening and in vitro antioxidant assays. The as-synthesized RuO2 NPs were characterized by XRD, HR-TEM, FT-IR, EDX and UV–Visible spectrometer. The HR-TEM image reveals spherical morphology with average particle size 5.6 nm (CR-RuO2 NP) and 4.6 nm (MO-RuO2 NP). The research findings of the current study elucidates the superiority of CR-RuO2 NPs and well exhibited towards scavenging activity, admirable anti-bacterial effect against K. pneumonia (21.6 ± 0.24 mm), and catalytic degradation percentage as 79.02%. The adsorption kinetics indeed suggest more impressive pseudo-second-order kinetic model than Lagergren first-order kinetics at 10 ppm concentration of MB dye. Our results thus provide a platform for further research on the applications of RuO2 NPs as disinfectant and better catalyst.
      PubDate: 2022-05-01
       
  • Facile Green Synthesis of Copper Oxide Nanoparticles and Their Rhodamine-b
           Dye Adsorption Property

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      Abstract: Adsorption has gained more popularity in wastewater treatment because the process is non-toxic, cheap, and highly efficient. Environmental and human-friendly adsorbents specifically have a vast prospective. Hence, in the present study, copper oxide nanoparticles (CuONPs) synthesized with Wedelia urticifolia leaf extract were used as adsorbents for Rhodamine-b (RhB) dye. The biomolecules responsible for the synthesis were predicted from Fourier transform infrared (FT-IR) analysis while UV–Visible (UV–Vis) spectroscopy, Dynamic laser spectroscopy (DLS), X-ray diffraction (XRD), and Transmission electron microscopy (TEM) techniques were used for particle characterization. The results revealed that the synthesized nanoparticles are crystalline and spherical with a size of less than 40 nm. The dye adsorption characteristics from the aquatic environment were investigated at room temperature under different doses of CuONPs, initial concentration of RhB dye, and contact time, and over 99% of RhB dye removal was achieved. The adsorption process of RhB dye onto the as-synthesized CuONPs was accurately described by the Freundlich isotherm and pseudo-second-order kinetic models. In summary, the as-synthesized nanoparticles possess an excellent ability for RhB adsorption, and hence these nanoparticles can be used as inexpensive, promising, and potential alternatives to traditional wastewater treatment techniques.
      PubDate: 2022-05-01
       
 
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