Subjects -> METALLURGY (Total: 59 journals)
Showing 1 - 10 of 10 Journals sorted alphabetically
Acta Metallurgica Slovaca     Open Access   (Followers: 2)
Advanced Device Materials     Open Access   (Followers: 6)
American Journal of Fluid Dynamics     Open Access   (Followers: 51)
Archives of Metallurgy and Materials     Open Access   (Followers: 9)
Asian Journal of Materials Science     Open Access   (Followers: 5)
Canadian Metallurgical Quarterly     Hybrid Journal   (Followers: 21)
Complex Metals     Open Access   (Followers: 2)
Corrosion Communications     Open Access   (Followers: 1)
Energy Materials : Materials Science and Engineering for Energy Systems     Hybrid Journal   (Followers: 24)
Handbook of Magnetic Materials     Full-text available via subscription   (Followers: 2)
High Temperature Materials and Processes     Open Access   (Followers: 6)
Indian Journal of Engineering and Materials Sciences (IJEMS)     Open Access   (Followers: 11)
International Journal of Metallurgy and Alloys     Full-text available via subscription   (Followers: 3)
International Journal of Metals     Open Access   (Followers: 7)
International Journal of Minerals, Metallurgy, and Materials     Hybrid Journal   (Followers: 13)
International Journal of Mining and Geo-Engineering     Open Access   (Followers: 4)
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 5)
ISIJ International - Iron and Steel Institute of Japan     Full-text available via subscription   (Followers: 26)
Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional’nye Pokrytiya (Proceedings of Higher Schools. Powder Metallurgy аnd Functional Coatings)     Full-text available via subscription   (Followers: 2)
JOM Journal of the Minerals, Metals and Materials Society     Hybrid Journal   (Followers: 36)
Journal of Advanced Joining Processes     Open Access  
Journal of Central South University     Hybrid Journal   (Followers: 1)
Journal of Cluster Science     Hybrid Journal  
Journal of Heavy Metal Toxicity and Diseases     Open Access  
Journal of Iron and Steel Research International     Hybrid Journal   (Followers: 11)
Journal of Materials & Metallurgical Engineering     Full-text available via subscription   (Followers: 2)
Journal of Materials Processing Technology     Hybrid Journal   (Followers: 21)
Journal of Metallurgical Engineering     Open Access   (Followers: 4)
Journal of Sustainable Metallurgy     Hybrid Journal   (Followers: 3)
Materials Science and Metallurgy Engineering     Open Access   (Followers: 7)
Metallurgical and Materials Engineering     Open Access   (Followers: 7)
Metallurgical and Materials Transactions A     Hybrid Journal   (Followers: 43)
Metallurgical and Materials Transactions B     Hybrid Journal   (Followers: 33)
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: 8)
Metallurgy and Foundry Engineering     Open Access   (Followers: 3)
Mining, Metallurgy & Exploration     Hybrid Journal  
Powder Diffraction     Full-text available via subscription   (Followers: 1)
Powder Metallurgy     Hybrid Journal   (Followers: 35)
Powder Metallurgy and Metal Ceramics     Hybrid Journal   (Followers: 7)
Powder Metallurgy Progress     Open Access   (Followers: 5)
Practical Metallography     Full-text available via subscription   (Followers: 5)
Rare Metals     Hybrid Journal   (Followers: 3)
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   (Followers: 1)
Russian Metallurgy (Metally)     Full-text available via subscription   (Followers: 4)
Science and Technology of Welding and Joining     Hybrid Journal   (Followers: 8)
Soldering & Surface Mount Technology     Hybrid Journal   (Followers: 2)
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: 5)
Tungsten     Hybrid Journal  
Universal Journal of Materials Science     Open Access   (Followers: 3)
Welding in the World     Hybrid Journal   (Followers: 8)
Welding International     Hybrid Journal   (Followers: 11)
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  [2654 journals]
  • Hydrothermal Preparation of Ni3S4/CoS2 Composite Electrocatalytic
           Materials for High Performance Counter Electrodes of Dye-Sensitized Solar
           Cells

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      Abstract: Abstract A facile one step synthetic hydrothermal route was used to fabricate the Pt free Ni3S4/CoS2 heterostructure counter electrode and study the photovoltaic characteristics constructed by the sandwich type DSSC. The heterostructure combination of Ni3S4 nanoparticles onto flexible CoS2 nanosheets is crucial for achieving the in high I3− reduction in the electrocatalytic activity. SEM and TEM results suggest that Ni3S4 has individual nanoparticles sizes in the range of 20–30 nm was uniformly decorated on the CoS2 nanosheets. When the combination of Ni3S4/CoS2 heterostructure CE delivered a high power conversion efficiency of 10.1% than that of sole Ni3S4 (5.8%) and CoS2 (4.5%). The superior PCE of the composite is due to the heterostructure, mesoporous nature and high surface area (103.4 m2/g). Due to the high photovoltaic and electrocatalytic activity of Ni3S4/CoS2 heterostructure can be useful for Pt free DSSCs, energy conversion and storage device applications.
      PubDate: 2021-10-12
       
  • Development of Protein Capped Nano Gold for NIR Photothermal and Molecular
           Imaging Applications for Diagnosis of Cancer Cells: In Vitro Studies

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      Abstract: Abstract The current work demonstrated an in vitro model of diastase capped gold nanoparticles (Au NPs) and nanoplates (Au NPts) as unique contrast agents for molecular imaging and photothermal cancer therapy, respectively. The Au NPs/Au NPts were fabricated and conjugated with monoclonal antibodies of anti-epidermal growth factor receptor (anti-EGFR). Anti-EGFR-AuNPs bioconjugate was studied for molecular imaging allowing to interact with the nasopharyngeal carcinoma (CNE2 cells). Confocal immunofluorescence microscopic results revealed the increased scattering and reflectance properties of CNE2 cells after attachment and localization of Anti-EGFR-AuNPs bioconjugate on the cell surface, consequently providing the good optical contrast for the cancer cell imaging. On the other hand, Anti-EGFR-Au NPts were studied for photothermal applications using two malignant oral epithelial cell lines (HSC 3 and HOC 313 clone 8) and a nonmalignant epithelial cell line (HaCat), which revealed that the malignant cells require almost half of the laser energy to be photothermally eliminated after exposure to continuous red laser at 800 nm when compared with the nonmalignant cells. Further, the present approach may have potential for development of NPs for selective photothermal therapy and a successful diagnostics of cancer cell for bioimaging applications.
      PubDate: 2021-10-09
       
  • Biocomposites Containing Silver Nanoparticles for Biomedical Applications

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      Abstract: Abstract Clinically, implant-related bone infections are a serious concern as they reduce the success rate of grafting techniques and increases the risk of morbidity. Clinicians use antibiotics to treat bone grafts. Silver-based components are gaining popularity for their exceptional antimicrobial activity. The current review provides the preparative procedure, characterization methods, and mechanical strength of silver-based composites. Additionally, the assessment includes information on the biocompatibility of silver-based composites and clinical studies for bone tissue engineering. Finally, the review discusses titanium implants coated with silver-based composites, their derivatives, and related studies. Overall, silver-based composites are a potential candidate for bone tissue engineering.
      PubDate: 2021-10-06
       
  • Synthesis, Characterization and Employed Doxycycline Capped Gold
           Nanoparticles on TRP Channel Expressions in SKBR3 Breast Cancer Cells and
           Antimicrobial Activity

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      Abstract: Abstract Doxycycline capped gold nanoparticles (doxy-Au(0) NPs) were prepared in an aqueous medium. Particle size and shape were determined by Transmission electron microscopy which showed the monodispersed morphology. The Fourier transform infrared spectra were represented the interaction of doxycycline with surface of doxy-Au(0) NPs. X-ray powder diffraction study gave crystalline nature of the doxy-Au(0) NPs. These doxy-Au(0) NPs have an impact on the expression levels of TRP channel genes in the breast cancer line (SKBR3) and the breast epithelial cell line (CRL-4010). Additionally, the antimicrobial activities have been evaluated to be used for multiple applications. Our results showed that the expression levels of TRP genes can be changed following the treatment of AuNPs (50 and 100 µg/mL). Furthermore, the antimicrobial activies have achieved some significant results. Finally, it has been concluded that doxy-Au(0) NPs are novel and can be used as alternative nanomedicine and extendable for control of other reducible contaminants as well.
      PubDate: 2021-10-06
       
  • A Heterogeneous Catalyzed Oxidase Consists of Zinc-Substituted
           Arsenomolybdate with Reactive Oxygen Species Catalytic Ability

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      Abstract: Abstract The usage of reactive oxygen species (ROS) is an effective method to treat pollutants in waste water. Chemical synthesis of artificial oxidase for the degradation of dyes is a new and hot research field from inorganic chemistry to printing and dyeing industry. In this paper, an artificial oxidase based on hybrid arsenomolybdate [Zn(en)2(H2O)2]2[(ZnO6)Mo6O18(As3O3)2] (abbreviated as ZAM, en = ethylenediamine), has been synthesized and structurally characterized by elemental analyses, IR spectrum, UV–Vis spectra, scanning electron microscope with energy dispersive X-Ray and single-crystal X-Ray diffraction. Structural analysis reveals that ZAM is an ionic compound, in which the cations are two [Zn(en)2(H2O)2]2+ coordination complexes and the anion is a modified Anderson-type cluster [(ZnO6)Mo6O18(As3O3)2]4−. Notably, ZAM can catalyze the production of ROS in aqueous solution efficiently. Moreover, it can specifically eliminate methylene blue dyes from the solution system by both adsorption and catalytic oxidation.
      PubDate: 2021-10-05
       
  • Fabrication of a Sensitive Biosensing System for Cu2+ ion Detection by
           Gold-Decorated Graphene Oxide Functionalized with Gly-Gly-His

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      Abstract: Incorporation of nanomaterials and nanostructures into sensors causes remarkable advances in device operation due to sensitivity, selectivity, multiplexed detection capability, and portability. In this study, a nanographene sensor coated with gold nanoparticles and tripeptide Gly–Gly–His was designed for Cu2+ ion detection at low concentrations. Graphene oxide synthesized by the modified Hummer’s method and analyzed by UV–Vis spectrometry, x-ray diffraction (XRD), and transmission electron microscopy (TEM). The optimum conditions based on the maximum gold loading were evaluated 71 min for incubation time and 1 for HAuCl4/HEPES concentration ratio. Gold-coating on graphene oxide was approved by TEM, UV–vis spectrometry, XRD, and FTIR. The EDC/Sulfo-NHS method was used to stabilize Gly-Gly-His to graphene oxide-gold, which has a high affinity toward Cu. The performance mechanism of this nanosystem was based on the localized surface plasmon resonance (LSPR) property of gold nanoparticles. The sensor was extremely selective and sensitive to Cu2+ with the detection limit of 8.83 nM without cross-binding to other metal ions. The response time was evaluated about 9 min. The GO-Au-GGH biosensor was also very stable and easily reused, which further confirms it as an efficient and sensitive Cu2+ ion detection device. Graphic
      PubDate: 2021-10-03
       
  • Radiation-Assisted Green Synthesis and Characterization of Selenium
           Nanoparticles, and Larvicidal Effects on Culex pipiens complex

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      Abstract: Abstract Many environmental hazards are due to chemical insecticides and enhance mosquito species' resistance. This problem is solved by using safer nanocides that reduce environmental pollution among integrated pest management (IPM) programs. Selenium nanoparticles (SeNPs) were green synthesized using Cupressus sempervirens, microwave (MW), and gamma irradiation (G) methods. Synthesized-SeNPs were characterized using UV–Vis spectroscopy, Fourier transform infrared spectroscopy (FT-IR), Dynamic light scattering (DLS), X-ray diffraction (XRD), Zeta potential analysis, and Transmission electron microscopy (TEM). Characterization revealed stable spherical particles with size 11-55 nm for SeNPs-MW (20 min) and 21-75 nm for SeNPs-G (40 KGy). Gamma and microwave irradiations play significant roles in increasing SeNPs yield and decreasing their size. The accumulative mortality of Culex pipiens complex larvae for SeNPs-MW and SeNPs-G at LC50 were 28.25 mg/L and 31.28 mg/L. The accumulated selenium concentration was increased in SeNPs-G treated larvae and measured with inductively coupled plasma mass spectrometry (ICP-MS). Ultrastructural study of the integument using TEM and light microscopy examination of midgut showed clear penetration and accumulation of SeNPs in exoskeleton and several deteriorations in epithelial cells. The results highlighted the important role of gamma and microwave irradiation with plant extract in synthesis and stabilization of SeNPs and their insecticidal efficacy against mosquitoes.
      PubDate: 2021-10-01
       
  • Novel In-Situ NanoEmulGel (NEG) of Azithromycin with Eugenol for the
           Treatment of Periodontitis: Formulation Development and Characterization

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      Abstract: The aim of present study was to develop and evaluate novel in situ nanoemulgel (NEG) of azithromycin (AZM) with eugenol for intra-pocket drug delivery for the treatment of periodontitis. Nanoemulsions of AZM were developed by spontaneous emulsification method containing Eugenol (oil phase), Tween 80 (surfactant) and PEG 400 (co-surfactant) and double distilled water (aqueous phase). The nanoemulsions were evaluated for surface morphology, globule size, polydispersibility index (PDI), zeta potential and viscosity. The final nanoemulsion formulation was converted into gelling system by using polaxamer 407 as a gelling agent. The prepared nanoemulgel was further evaluated for drug content, pH, viscosity, syringeability, sol–gel transition temperature, in-vitro drug release and skin irritation test using HET-CAM assay. The optimized nanoemulsion formulation had 10% oil, 40% Smix and 50% water with globule size, PDI and zeta potential as 31 ± 7 nm, 0. 285 ± 0.023 and − 23 ± 4 mV respectively. NEG of azithromycin showed good syringeability and viscosity proving its suitability of desired sol–gel property of formulation for periodontal drug delivery. In-vitro permeability results showed that NEG offered sustained release of AZM. HET-CAM assay revealed the non-irritancy of the developed NEG. The optimized NEG loaded with AZM was found to be suitable for intra-pocket drug delivery for sustained release effect. Graphic
      PubDate: 2021-09-30
       
  • Synthesis of Amphotericin B Conjugated Chitosan Nanomaterial From Fish
           Scales and Evaluation of its Antifungal Activity

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      Abstract: Abstract Nanotechnology deals with the new facets of materials described as nanomaterials which have interesting attributes like large surface area to volume ratio compared to its native form. The goal of this study was to prepare chitosan nanomaterial and Amphotericin B conjugated chitosan nanomaterial from the chitosan polymer extracted from the fish scales. Generally, the rise of antibiotic resistant microorganisms demanded large scale exploitation of these polymeric nanomaterials. The limitations of standard Amphotericin B in terms of its instability issues, poor water solubility, and toxicities are solved by conjugating the drug with pure chitosan nanomaterial. The physicochemical characterization of the fabricated nanomaterials was analyzed using SEM-EDAX, FTIR, XRD, UV–Visible spectroscopy. The mean particle size of CS NM and AmB-conjugated CS NM was found to be 2.5 µm and 0.19 µm. Both nanomaterials are spherical shaped and highly stable. In vitro antifungal susceptibility testing using Candida parapsilopsis showed a dose dependent fungicidal activity by both nanomaterials. The antifungal activity was accessed. Additionally, the antibiofilm activity of the prepared nanomaterials was also examined. From the current study Amphotericin B conjugated chitosan nanomaterial manifested a superior antifungal activity compared to the parent nanomaterials.
      PubDate: 2021-09-28
       
  • A Novel Bacterial Route to Synthesize Cu Nanoparticles and Their
           Antibacterial Activity

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      Abstract: Abstract This report focuses on a facile and one-pot way to synthesize stable Cu nanoparticles (NPs) through a bacterial approach using an inexpensive and non-toxic copper salt in the aqueous solution. Copper NPs were obtained from an extracellular enzymatic metal-reduction process via bacterial strains PN14F and B3 which were similar with Bacillus haynesii (99.87%) and Bacillus halotolerans (100%), respectively, on the basis of phylogenic analysis. It was found that Cu NPs were formed in the cell-free culture liquid but not in the fresh biomass medium, so that it was hypothesized that an extracellular compound was responsible for the proceeding. According to the spectroscopic data, the NPs can bind to the proteins through their free amine or carboxylate groups. It is noteworthy that by varying the bacterial supernatant, the remarkable changes occur in the size and morphology of copper NPs, where their thickness and diameter are observed to be 2–30 and 1–15 nm in the presence of bacterial strains PN14F and B3, respectively. It is noticeable that this manner is a novel, green, eco-friendly and suitable method for large-scale production. Finally, the as-made Cu NPs showed antibacterial activity against B. Subtilis, in which a significant decrease was observed in its growth.
      PubDate: 2021-09-25
       
  • Self-assembly of Pd4L2 Supramolecular Cage and Permanganate Anion
           Adsorption Behavior in Water

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      Abstract: Abstract A novel metal–organic cage 1·8PF6− was precisely self-assembled using polynitrogen pyrazine-triazine ligand as linker L1 and bpyPd(NO3)2 as coordination corner (where 1·8PF6− = [(bpyPd)4L12]8+·8PF6−; L1 = 4, 6-bis((pyrazin-2-ylmethyl)amino)-1,3,5-triazin-2-ol); bpy = 2,2′-bipyridine) in aqueous solution. The capsule-like coordination cage 1·8PF6− was fully characterized by single-crystal X-ray diffraction analysis, 1H and 13C-NMR and ESI–MS analysis. In the crystal structure, cage 1 closely stacked into a stable 3D framework structure with a regular channel. By employment of such crystalline adsorbent material, permanganate anion (MnO4−) can be rapidly adsorbed into cationic channel and exchanged with hexafluorophosphate anion from water, in which the crystallinity of cage 1 remained unaffected before and after adsorption. Moreover, the anion adsorption and exchanging behavior was revealed by Fourier transform infrared spectra (FTIR), powder X-ray diffraction analysis (PXRD), scanning electron microscopy (SEM), electron adsorption and fluorescence spectroscopy.
      PubDate: 2021-09-22
       
  • Biosynthesized Zinc Oxide Nanoparticles as Efficient Photocatalytic and
           Antimicrobial Agent

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      Abstract: Abstract This work reports an innovative, effortless and inexpensive method for the preparation of ZnO nanoparticles by green approach using leaf extract of Piper betleas a reducing-stabilizing negotiator. The prepared ZnO NPs were characterized through XRD, FTIR, UV–Visible spectroscopy, and EDX etc. The band gap energy of the sample was estimated as 3.41 eV which is larger than the bulk ZnO (Eg = 3.37 eV). The observed blue shift is attributed to the quantum confinement of excitons. FTIR analysis showed the presence of alkaloids, flavonoids, polyphenols, and terpenoid. TEM analysis showed that each nanoparticle comprised of 1 to 2 nano-crystallites. Photocatalytic activity results revealed that ZnO-NPs prepared through green synthesis route were found to be efficient in the degradation of toxic reactive red dye with degradation efficiency of 96.4% having high photodegradation rate-constant of 1.6 × 10–2 min−1. As an antimicrobial agent, the ZnO NPs are effective against both gram-positive (Bacillus subtilis) and negative bacteria (Escherichia coli), with the zones of clearance as 16.4 and 14.3 mm, respectively. Therefore, present research signifies an effective approach to utilize as-prepared ZnO NPs as efficient photocatalysts as well as antimicrobial agent.
      PubDate: 2021-09-22
       
  • Green Light Emitting Cadmium Sulfide Nanoparticles with Coral Surface
           Morphology

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      Abstract: Cadmium sulfide (CdS) is an important semiconductor material that has been utilized constructively for various modern applications. There were lot of works regarding the preparation of CdS nanoparticles. The present work has utilized a chemical precipitation method with and without using a capping agent. Even though the solvent system used for the preparation is a new one and provides a non-toxic reaction medium, this work mainly focused on the advantages of surface capping on nanoparticles. CdS nanoparticles prepared by surface capping with oleic acid (OA) exhibit many unique properties compared to the uncapped nanoparticles. The coral shaped surface morphology and the bright green fluorescence observed in OA capped CdS nanoparticles were not reported elsewhere. Strong absorption of radiation in the visible as well as in the ultraviolet region with a large band gap was also observed in capped CdS nanoparticles. Blue shift in emission with an intense peak was another unique character observed in the surface capped CdS nanoparticles. Morphological, structural, optical and thermal properties of the capped and uncapped CdS nanoparticles were systematically investigated. Graphic
      PubDate: 2021-09-22
       
  • Green Synthesis of Triangular ZnO Nanoparticles Using Azadirachta indica
           Leaf Extract and Its Shape Dependency for Significant Antimicrobial
           Activity: Joint Experimental and Theoretical Investigation

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      Abstract: The present study reports the green synthesis of triangular ZnO nanoparticles (G-ZnO NPs) using Azadirachta indica leaves extract, and a shape dependent density functional investigation for ZnO NPs on their antimicrobial activity. The X-ray diffraction (XRD) analysis shows the synthesized G-ZnO NPs are well crystalline in nature and calculated grain size is found to be 60–65 nm. The Fourier transforms infrared spectroscopy (FT-IR) represents that the functional group and capping agents are well attached to the nanoparticles, and the bands located near 500.8 cm−1, 459.07 cm−1 and 418.57 cm−1 represents G-ZnO NPs. Scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDS) confirmed the presence of the synthesized G-ZnO nanoparticles with an average size range 100–200 nm. The synthesized G-ZnO NPs are found to be in the triangular shape. A detail theoretical investigation under density functional framework shows that our synthesized triangular ZnO nanoparticles are better candidate for biological interactions compared to the prototypical spherical counterpart. The synthesized G-ZnO nanoparticles using A. indica leaves extract in triangular shape are found to show significant antimicrobial activity against Escherichia coli and Bacillus subtilis indicating a better alternative to the typical chemical methods. Graphic
      PubDate: 2021-09-20
       
  • Correction to: Derived from Diaryl-λ3-Iodane-Containing Polyoxometalate:
           Iodine-Doped Molybdenum Carbide for Efficient Electrocatalytic Hydrogen
           Evolution

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      PubDate: 2021-09-19
       
  • Green Synthesis, Characterization and Antibacterial Activity of SiO2–ZnO
           Nanocomposite by Dictyota bartayresiana Extract and Its Cytotoxic Effect
           on HT29 Cell Line

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      Abstract: This study elucidates the biosynthesis of two various metal nanoparticles using brown seaweed algae from the southeast coast region of Tamil Nadu. The synthesized SiO2–ZnO nanocomposite was analyzed using UV–Vis, SEM, FT-IR and XRD analysis. The biomedical studies of synthesized SiO2–ZnO nanocomposite on antioxidant, antibacterial and anticancer activity were evaluated. Antioxidant screening assays were performed by using nitric oxide, hydrogen peroxide and ABTS assay. MTT assay and well-cut drug diffusion assay were performed for anticancer and antibacterial studies. The bio-synthesized SiO2–ZnO nanocomposites have acted as a promising potential drug against HT29 cancer cell line of colon cancer and explore the best range of zone inhibition upon gram-negative and gram-positive bacterial strains. The results provide the facts that the seaweed mediated synthesis of SiO2–ZnO nanocomposite might be the potential source to treat adenorectal colon cancer cell and exhibits significant effect on Escherichia coli, Vibrio cholera, Pseudomonas aeruginosa, Bacillus subtilis and Staphylococcus aureus. This study confirms that seaweed extract mediated synthesis of SiO2–ZnO nanocomposites significantly inhibits bacterial colonies especially urinary tract infection pathogens and shows excellent antioxidant activity. Graphic Schematic representation of synthesized SiO2–ZnO nanocomposites and their therapeutic evaluation.
      PubDate: 2021-09-19
       
  • The Crystal Structures of Two Hydro-closo-Borates with Divalent Tin in
           Comparison: Sn(H2O)3[B10H10] · 3 H2O and Sn(H2O)3[B12H12] · 4
           H2O

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      Abstract: Abstract Single crystals of Sn(H2O)3[B10H10] · 3 H2O and Sn(H2O)3[B12H12] · 4 H2O are easily accessible by reactions of aqueous solutions of the acids (H3O)2[B10H10] and (H3O)2[B12H12] with an excess of tin metal powder after isothermal evaporation of the clear brines. Both compounds crystallize with similar structures in the triclinic system with space group P \(\bar{1 }\) and Z = 2. The crystallographic main features are electroneutral \({}_{\infty }^{1} \{\) Sn(H2O)3/1[B10H10]3/3} and \({}_{\infty }^{1} \{\) Sn(H2O)3/1[B12H12]3/3} double chains running along the a-axes. Each Sn2+ cation is coordinated by three water molecules of hydration (d(Sn–O) = 221–225 pm for the B10 and d(Sn–O) = 222–227 pm for the B12 compound) and additionally by hydridic hydrogen atoms of the three nearest boron clusters (d(Sn–H) = 281–322 pm for the B10 and d(Sn–H) = 278–291 pm for the B12 compound), which complete the coordination sphere. Between these tin(II)-bonded water and the three or four interstitial crystal water molecules, classical bridging hydrogen bonds are found, connecting the double chains to each other. Furthermore, there is also non-classical hydrogen bonding between the anionic [BnHn]2− (n = 10 and 12) clusters and the crystal water molecules pursuant to B–Hδ− \(\cdots\) δ+H–O interactions often called dihydrogen bonds.
      PubDate: 2021-09-13
       
  • The Effect of Calcium Perovskite and Newly Developed Magnetic
           CaFe2O4/CaTiO3 Perovskite Nanocomposite on Degradation of Toxic Dyes Under
           UV–Visible Radiation

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      Abstract: Abstract In this research, we used a fast and simple method for synthesis of calcium titanate (CaTiO3) and calcium ferrite (CaFe2O4) nanostructures: microwave assisted co-precipitation method. The effect of time, microwave radiation power and type of solvent on the morphology of magnetic nanoparticles was studied. Calcium ferrite/calcium titanate (CaFe2O4/CaTiO3) nanocomposite was prepared by the same method. The morphology and particles size of samples were studied by scanning electron microscopy. The porous nanostructure of CaTiO3 and CaFe2O4/CaTiO3 were ideal for photocatalytic behavior. The crystallographic properties of products were analyzed using X-ray diffraction technique. The purity of the samples confirmed by Fourier transform infrared spectroscopy. The magnetic property of CaFe2O4 and CaFe2O4/CaTiO3 nanoparticles was determined by vibrating sample magnetometry. Both products had ferromagnetic properties with nanocomposite being a hard ferromagnetic sample. The photocatalytic behavior of CaTiO3 and prepared nanocomposite was studied by measuring degradation efficiency of three different acidic dyes irradiated under UV–Visible light in different initial conditions. The results confirmed that both products have photocatalytic properties, but the CaFe2O4/CaTiO3 has a higher photocatalytic activity due to coupling of two semiconductors, which can be employed for effective charge separation and increase of lifetime in the charge carriers.
      PubDate: 2021-09-06
       
  • Study on Polyoxomolybdate [Mo8O26]4− Based Crystalline Compound and Its
           Polypyrrole Nanocomposite as l-Cysteine Colorimetric Biosensor

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      Abstract: Abstract A new octamolybdate based organic–inorganic hybrid compound with unusual Ag–Ag chain, [Ag2(bit)2]2[Mo8O26], was successfully synthesized and well characterized. [Ag2(bit)2]2[Mo8O26] as colorimetric sensor materials for l-cysteine (l-Cys) were investigated for the first time. Similar to other type polyoxometalates (POMs), [Ag2(bit)2]2[Mo8O26] exhibits the good peroxidase-like activity attributed to the nature of [Mo8O26]4−, indicating that the polyoxomolybdate based hybrid materials can perform colorimetric sensing to detection biomolecule such as l-Cys. Moreover, to improve the peroxidase-like activity, [Ag2(bit)2]2[Mo8O26]/PPy nanocomposite was also fabricated, and [Ag2(bit)2]2[Mo8O26]/PPy based colorimetric sensing towards l-Cys exhibits the limit of detection of 0.22 μM in the linear range of 1–100 μM, being superior than most reported nanozyme.
      PubDate: 2021-09-05
       
  • Syntheses, Crystal Structure, Theoretical Calculation and Photophysical
           Properties of one Inorganic–Organic Hybrid Frameworks Based on Mixed
           Ligands

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      Abstract: Abstract One novel Inorganic–Organic Hybrid compound [Pb(mip)(bidc)]n (1) [mip = 2-(3-methoxyphenyl)-1H-imidazo[4,5-f][1,10]phenanthroline, bidc = 2,2′bipyridinyl-3,3′-dicarboxylic acid] has been synthesized by hydrothermal reactions and characterized by thermogravimetrianalysis, elemental analysis, infrared spectrum and single-crystal X-ray diffraction. The single-crystal X-ray diffraction results suggest that compound 1 exhibits 1D chain structure, which is constructed from N–H···O hydrogen bonds. TG analysis results suggest that compound 1 has excellent thermal stability, the reason of that may be the existence of hydrogen bonds reinforces the structural stability. It is noteworthy that the metal ions Pb (II) are located in [:PbN2O4] pentagonal bipyramidal geometry in the title compound. The theoretical calculation analysis of 1 was performed by the PBE0/LANL2DZ method in Gaussian 03 Program to elucidate the essential electronic characters. The luminescent properties for the ligand mip and compound 1 are also discussed in detail.
      PubDate: 2021-09-04
       
 
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