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: 44)
Archives of Metallurgy and Materials     Open Access   (Followers: 9)
Asian Journal of Materials Science     Open Access   (Followers: 4)
Canadian Metallurgical Quarterly     Hybrid Journal   (Followers: 21)
Complex Metals     Open Access   (Followers: 2)
Energy Materials : Materials Science and Engineering for Energy Systems     Hybrid Journal   (Followers: 24)
Graphene and 2D Materials     Open Access   (Followers: 6)
Handbook of Ferromagnetic Materials     Full-text available via subscription   (Followers: 1)
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: 2)
International Journal of Metals     Open Access   (Followers: 7)
International Journal of Minerals, Metallurgy, and Materials     Hybrid Journal   (Followers: 12)
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: 35)
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)
Metal Finishing     Full-text available via subscription   (Followers: 20)
Metallurgical and Materials Engineering     Open Access   (Followers: 7)
Metallurgical and Materials Transactions A     Hybrid Journal   (Followers: 42)
Metallurgical and Materials Transactions B     Hybrid Journal   (Followers: 32)
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: 6)
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)
Steel Times lnternational     Partially Free   (Followers: 19)
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  [2656 journals]
  • A Novel 2D Organic–Inorganic Hybrid Based on Tetra-Cu II Substituted
           Sandwich-Type Mo/V-Arsenite-Based Heteropolymolybdate with Magnetic
           Property and Electrochemical Sensing of Ascorbic Acid
    • Abstract: A new organic–inorganic hybrid, [NH4]10[Cu(im)2]2[Cu4(AsIIIMo10V4O47)2]·20H2O (1) has been synthesized and structurally characterized. Compound 1 exhibits the 2D layered framework constructed from the sandwich-type [Cu4( \({\text{As}}^{{\text{III}}} {\text{Mo}}^{{\text{VI}}}_{10} {\text{V}}^{{\text{V}}}_{4} {\text{O}}_{47}\) )2]14− fragments linked alternately with [Cu(im)2]2+ units, which represents the first 2D organic–inorganic hybrid containing tetra-CuII substituted sandwich-type Mo/V-arsenite-based heteropolymolybdate. Interesting, the magnetic measurement of 1 indicates the presence of ferromagnetic interactions among the {Cu4O16} cluster. In addition, the functional application of 1 in electrochemical sensing of ascorbic acid is also investigated in details.
      PubDate: 2019-03-21
      DOI: 10.1007/s10876-019-01531-w
  • Synthesis of a Chiral Polyoxovanadate Derivative by Covalently
           Modification with a Chiral Amino Acid Ester
    • Abstract: In this communication, a chiral polyoxometalate hybrid incorporating chiral amino acid ligands was prepared via the post-functionalization of tri(alkoxoyl) hexavanadates. The product was characterized by FT-IR, 1H NMR, ESI–MS, TGA as well as elemental analysis, and its structure was finally confirmed by single crystal X-ray diffraction. In addition to the chiral products, the crystal of the mesomer was also obtained, which was formed by racemization during the condensing reaction. The two stereoisomers showed different supramolecular assemblies due to different symmetries. This work opens a new mind towards rational design of chiral POM derivatives.
      PubDate: 2019-03-21
      DOI: 10.1007/s10876-019-01536-5
  • Fabrication of Hexagonal Disc Shaped Nanoparticles g-C3N4/NiO
           Heterostructured Nanocomposites for Efficient Visible Light Photocatalytic
    • Abstract: A hexagonal shaped nickel oxide/graphitic carbon nitride (NiO/g-C3N4) heterojunction composite was synthesized via a facile microwave irradiation route joint with succeeding calcination process. The structural, morphological and optical properties of the catalysts were characterized by XRD, TEM, Raman, UV–DRS, PL and BET analysis. XRD and TEM results exposed that cubic structure and with two dimensional hexagonal discs shaped morphology with sizes in the range of 30–40 nm. The incorporation of g-C3N4 caused a red-shift of the UV–Vis absorption edge of NiO. Moreover, exfoliation of bulk g-C3N4 into two dimensional g-C3N4 nanodiscs offers large surface area (102 m2/g) and exposed active sites, which are beneficial for photocatalytic activity enhancement. The photocatalytic activity of the photocatalysts was analyzed by degradation of congo-red and malachite green (MG) under induced visible light irradiation. The results demonstrates that NiO/g-C3N4 with 1.2 mass ratios shows the optimal overall photocatalytic performance such as huge degradation efficiency (97%), high rate constant (0.02012 min−1) and high stability (only loss ~ 3.5) after 7 cycles test (for MG dye). The superior photoactivity of NiO–g-C3N4 photocatalysts possibly will be recognized to the successful interfacial charge transfer between NiO and g-C3N4, thus suppressing the recombination of the photoexcited electron–hole pairs.
      PubDate: 2019-03-20
      DOI: 10.1007/s10876-019-01535-6
  • Engineered Nanomaterials as Potential Candidates for HIV Treatment:
           Between Opportunities and Challenges
    • Abstract: Nanomaterials have received considerable attention due to their unique properties; they have high surface area compared to volume ratio, giving them superior chemical, optical and thermal characteristics. Nanomaterials have also both diagnostic and therapeutic applications. In this mini review, we are highlighting valuable data about human immunodeficiency virus (HIV), its relationship with cancer and its potential treatment with some nanomaterials such as silver nanoparticles (Ag NPs).
      PubDate: 2019-03-20
      DOI: 10.1007/s10876-019-01533-8
  • Structural Evolution and Chemical Bonding in Bi-nuclear Niobium Sulfide
           Clusters: Nb 2 S n −/0 ( n  = 4–7)
    • Abstract: Geometric and electronic structures of a series of bi-nuclear niobium sulfide clusters, Nb2S n −/0 (n = 4–7), were investigated by the theoretical calculations. Vertical detachment energies were estimated based on the generalized Koopmans’ theorem and were used to simulate the anionic photoelectron spectra. The structural evolution behaviors were found to be present in the sequential sulfidation of Nb2S n −/0 . Concretely, the additional sulfur atoms tended to occupy the bridging sites of Nb2S n −/0 (n = 4, 5) clusters. Then varied poly-sulfur ligands (i.e., bridging S 2 2 − , terminal S 2 2 − and bridging S 3 2 − ) began to emerge in the Nb2S n −/0 (n = 6, 7) clusters. Frontier molecular orbitals were analyzed to understand the chemical bonding. It was found that the highest occupied molecular orbital of Nb2S n − cluster, even the sulfur-rich Nb2S 7 − cluster, still retained the Nb–Nb bonding features. The results were compared with the analogs Mo2S n −/0 (n = 4–7) clusters. The findings in structures and chemical bonding may provide insight into the properties of niobium sulfides, especially for the sulfur-rich surfaces.
      PubDate: 2019-03-20
      DOI: 10.1007/s10876-019-01532-9
  • Synthesis, Crystal Structures and Magnetic Properties of Carboxyl Bridged
           3 d –4 f Heterometallic Coordination Polymers Based on Metalloligand and
           Lanthanide Ions
    • Abstract: Two new three-dimensional 3d–4f heterometallic coordination polymers, {[Tb2(DMSO)6][LCu]3·5CH3OH}n1 and {[Er2(DMSO)4][LCu]3·2DMSO·6CH3OH}n2 (DMSO = dimethyl sulfoxide), based on carboxyl-containing metalloligand LCu ([Cu(2,4-pydca)2]2−, 2,4-pydca = pyridine-2,4-dicarboxylate) and lanthanide ions (TbIII, ErIII), have been synthesized with inter-diffusion method and well characterized. Single-crystal X-ray diffraction studies indicates that 1 and 2 crystallize in the space group of P − 1 of the triclinic crystal system and show 3D frameworks, which are severally established by {Tb2} and {Er2} clusters bridging with LCu metalloligands. The whole frameworks of 1 and 2 illustrate the similar 6-connected single-nodal topology with the point symbol of {412·63}. The most structural difference between two coordination polymers is that 2 exhibits a twofold interpenetrated framework. Thermal analysis reveals that 1 and 2 have similar thermal behavior with the skeleton both collapse after 292 °C. Magnetic measurements suggest that 1 and 2 exhibit the weak antiferromagnetic properties, which may be due to the existence of crystal-field effects of LnIII ions and the contribution of orbital couplings between the spin centers.
      PubDate: 2019-03-19
      DOI: 10.1007/s10876-019-01534-7
  • Optical Properties of Titania–Zirconia Clusters: a TD-DFT Study
    • Abstract: Time dependent density functional theory (TD-DFT) study of the optical properties of titania (TiO2), Zirconia (ZrO2) and their hybrid clusters TiZrO4 are reported. The UV–Visible spectra and Circular Dichroism spectra of the clusters were computed to investigate the molecular orbitals, excitation energies, electronic transitions, HOMO–LUMO characters, oscillatory and rotatory strengths of the clusters. The excitation energies of \(TiZrO_{4}\) starting from \(Zr_{2} O_{4}\) appeared in the visible and near UV region whereas the same is found in near UV region when starting geometry was switched to \(Ti_{2} O_{4}\) . The findings of this study revealed that the optical properties of the hybrid clusters are strongly influenced from the geometry of starting clusters. Further, the excitation spectra of the hybrid clusters possess the finger prints of the properties of the starting clusters. The optical activity of the hybrid clusters in visible and near UV regions points to potential of the materials for application in photocatalysis. The hybrid material points to possibility of preparation of tunable materials for use in electronic, optoelectronic, electrochemical/photo-catalytic applications and as chiral compounds.
      PubDate: 2019-03-14
      DOI: 10.1007/s10876-019-01529-4
  • Evaluation of Antibacterial and Anticancer Potential of
           Polyaniline-Bimetal Nanocomposites Synthesized from Chemical Reduction
    • Abstract: This study gold (Au) and gold–platinum (Au–Pt) colloids were synthesized by borohydride reduction method in the presence of poly(N-vinyl-2-pyrrolidone) as a stabilizing agent. Besides, pristine polyaniline (PANI), PANI-Au nanocomposites, and PANI-Au–Pt nanocomposites were prepared. The synthesized nano-composites characterized by UV–Vis, FT-IR, XRD, and HR-TEM with energy dispersive X-ray techniques. Au and Au–Pt NPs were spherical in shape with particle sizes at 8 and 3 nm, respectively. PANI-Au and PANI-Au–Pt nanocomposites were also spherical in shape with particle sizes at 3 and 2 nm, respectively. Pristine PANI, PANI-Au, and PANI-Au–Pt nanocomposites were subjected to antibacterial activity against gram-positive (Bacillus subtilis and Staphylococcus aureus) and gram-negative (Escherichia coli and Vibrio cholerae) bacterial pathogens. PANI-Au–Pt nanocomposite showed significant antibacterial activity (33 ± 1.10 mm dia) against B. subtilis. Besides, the MIC of pristine PANI, PANI-Au, and PANI-Au–Pt nanocomposites were found to be 75, 50 and 25 µg/mL, respectively. Besides, the in vitro anticancer investigations against HepG2 liver cancer cells revealed the highest cytotoxicity for PANI-Au–Pt nanocomposite (21.25 µg/mL) followed by PANI-Au nanocomposite (32 µg/mL) and pristine PANI (49 µg/mL). Overall, the present study showed considerable antibacterial and anticancer activity and suggested their potential use in pharmaceuticals after completing successful clinical trials for safety and affordability.
      PubDate: 2019-03-13
      DOI: 10.1007/s10876-019-01530-x
  • Potential Nematicidal Properties of Silver Boron Nanoparticles: Synthesis,
           Characterization, In Vitro and In Vivo Root-Knot Nematode ( Meloidogyne
           incognita ) Treatments
    • Abstract: The purpose of this work is to evaluate the anti-nematode activity of silver boron nanoparticles (AgB NPs) synthesized by PVP polymer and gamma rays as a novel cost-effective and eco-friendly green method. AgB NPs were structurally identified by UV–Vis., XRD, HRTM, DLS, FTIR, SEM and EDX mapping analysis. A suggested reaction mechanism was considered. In-vitro and in vivo nematicidal potential of AgB NPs against root-knot Meloidogyne incognita was examined. HRTEM image exhibited spherical AgB NPs with a diameter of 29.55 nm. FTIR spectrum explains that there is a continuous reduction of ions due to PVP oxidation. AgB NPs possesses an encourage anti-nematode against M. incognita causing root-knot in the tomato plant. Treatment 3 exhibited the maximum mortality as 74.20% after 96 h. It also decreased root galls and egg masses numbers after 1 week of the infection (20.33 galls and 2.33 egg masses). Treatments 3 and 4 reduced the numbers of the 2nd stage juveniles, females and the developmental stages. Boron at the permissible limits was adjusted to be more than silver in the synthesized AgB NPs (to avoid the toxicity) for developing the resistance and immunity of the tomato plant. Therefore, AgB NPs may recognize potential targets within agricultural treatments.
      PubDate: 2019-03-13
      DOI: 10.1007/s10876-019-01528-5
  • Third Order Non-linear Optical Susceptibility (χ (3) ) and Evaluation of
           Antibacterial Activity of Cu-Doped ZnSe Nanocrystals Fabricated by
           Hydro-Microwave Technique
    • Abstract: In this work, Cu-doped ZnSe nanoparticles (NPs) at the presence of different Cu contents and also with/without 6 min microwave irradiation were fabricated in aqueous medium, and then some optical properties and also their antibacterial properties against two gram-positive bacteria of Staphylococcus aureus and Bacillus cereus were investigated, employing disc-diffusion method. To fabricate these NPs, Se ion source was provided from the interaction between Se and NaBH4, and zinc acetate was used as Zn ion source. At the fixed pH of 11.2, thioglycolic acid was used as surfactant to prevent agglomeration of NPs. Previously reported results of X-ray diffraction characterization and UV-visible spectroscopy of solutions containing nanoparticles, show the range of 1.94–2.14 for particles size and 3.50–3.65 eV for energy gap. In this research, non-linear optical susceptibility of ZnSe and ZnSe:Cu nanoparticles have been determined; results imply that these nanoparticles have a high potential in optical and optoelectronic applications and among them, sample owing 1.5% of impurity and so owing the highest χ(3), is an optimum candidate in optical applications. Results of the present research confirm that nonlinear optical susceptibility is in inverse relation with the energy gap and increase with increasing of Cu%. To explore the antibacterial activity of the present samples, first Staphylococcus aureus and Bacillus cereus bacteria were inoculated on Muller–Hinton–Agar culture, and then the loaded discs by nanoparticles were placed on them. After 18 h from the incubation, the inhibition zone diameters (their antibacterial sensitivity) were measured for each bacteria. Results of this research imply on that these nanoparticles have considerable antibacterial activity against the gram-positive bacteria of Staphylococcus aureus and Bacillus cereus, and have the usage ability in the field of antibacterial drugs. During this assessment, increase in impurity content resulted in improvement of antibacterial potential, especially the more efficiency on Staphylococcus aureus. In addition, it was shown that increase of the concentration (loading volume of solution containing NPs) lead to increase of bacterial growth inhibition. Results confirm that the optimal antibacterial activity is devoted to the 0.75% Cu-doped nanoparticles on Staphylococcus aureus. Also the undoped sample prepared under 6 min microwave irradiation had the highest antibacterial activity against the Bacillus cereus. In brief, studied NPs show excellent bactericidal and optical activity, introducing them as promising bio-opto-materials.
      PubDate: 2019-03-06
      DOI: 10.1007/s10876-019-01527-6
  • Sonochemical Mediated Synthesis of Iron Oxide (Fe 3 O 4 and Fe 2 O 3 )
           Nanoparticles and their Characterization, Cytotoxicity and Antibacterial
    • Abstract: We synthesized the iron oxide nanoparticles (IONPs) through sonochemical process and analyzed their characteristics and bioactivities. Field emission transmission electron microscopy and particle size analyzer results showed the spherical shaped IONPs with an average size of 8 nm. X-ray diffraction and Fourier transform infrared peaks confirms the formation of IONPs (Fe3O4 and Fe2O3). The IONPs did not induce the cytotoxicity in NIH3T3 but it showed the cytotoxicity in A549 cells with inhibitory concentration (IC50 19.82 µg mL−1). Further, acridine orange/ethidium bromide staining revealed that untreated cells had green nucleus while treated one had many dots of orange color cells as an indication of late apoptotic and necrotic cells. The 2′, 7′-dichlorofluorescein diacetate staining results showed the excessive amounts of reactive oxygen species generation in IONPs treated A549 cells than the untreated cells. Further, the flow cytometer results showed about 2.15% of necrotic cells and 1.68% of apoptotic cells in IONPs treated A549 cells. The IONPs showed antibacterial efficiency on bacterial pathogens with a minimal inhibitory concentration of 0.15 mg mL−1 for Salmonella enterica, Staphylococcus aureus, Bacillus cereus, Pseudomonas aeruginosa, and Escherichia coli. These results are emphasized the bioactive potency of synthesized IONPs for future biomedical applications.
      PubDate: 2019-03-05
      DOI: 10.1007/s10876-019-01526-7
  • Five Transition-Metal-Substituted Polyoxometalates: Syntheses, Structures
           and Electrochemical Properties
    • Abstract: A series of transition metal, such as Ni/Mn/Zn, substituted sandwich-type polyoxometalates, H9Na(enMe)3[Ni4(H2O)2(PW9O34)2]·31H2O (1), H8Na2[Ni4(H2O)2(PW9O34)2]·34H2O (2), H8Na2[Mn4(H2O)2(PW9O34)2]·29H2O (3), H4Na6[Mn4(H2O)2(PW9O34)2]·41H2O (4), H5Na7[Zn4(H2O)2(GeW9O34)2]·25H2O (5) have been synthesized under mild hydrothermal conditions and characterized by IR spectra, thermogravimetric analysis, elemental analysis, single-crystal X-ray diffraction and powder X-ray diffraction, respectively. The structure analysis reveals that 1–5 contain a similar sandwich-type polyoxoanion unit [M4(H2O)2(XW9O34)2]10−/12− (M = Ni2+/Mn2+/Zn2+; X = PV/GeIV), which are further linked by Na+ cations to form 1- to 3-D structures, respectively. Furthermore, the electrochemical properties of 1, 4 and 5 have been studied in 0.5 mol L−1 Na2SO4/H2SO4 supporting electrolyte, and show that 1, 4 and 5 possess comparatively apparent catalytic activities toward the NaNO2 or H2O2 reduction.
      PubDate: 2019-03-04
      DOI: 10.1007/s10876-019-01523-w
  • Synergistic Effect of POMCPs and PPy for Enhancing Visible-Light
           Photocatalytic Activity and High Quantum Yields
    • Abstract: A new Keggin-type POMs based Cu-bib (bib = 1,4-bis(imidazol-1-ylmethyl)benzene) coordination polymer with appropriate surface areas and rich active sites, [Cu(bib)][H3PW12O40]·(Hbib)2·2H2O (Cu(bib)PW12), was successfully synthesized and structurally characterized. To improve the photocatalytic activity of Cu(bib)PW12, polypyrrole (PPy) was loaded on its surface through a facile in situ oxidation polymerization process. Under the irradiation of visible light, the composites (Cu(bib)PW12/PPy (A and B) exhibited excellent photocatalytic activities for the degradation of methylene blue than pure Cu(bib)PW12 crystal, PPy and their mechanically mixing (Cu(bib)PW12/PPy (A′ and B′), respectively. Catalytic mechanism study indicates that the enhancement of photocatalytic activities of Cu(bib)PW12/PPy can be attributed to the higher separation efficiency of the photogenerated electron–hole pair on the interface of PPy and Cu(bib)PW12. These results suggest that loading PPy onto the surface of POMCPs would be a feasible strategy to enhance the photocatalytic activity of POMCPs.
      PubDate: 2019-03-02
      DOI: 10.1007/s10876-019-01506-x
  • Synthesis and Characterization of a Novel POM-Based Compound Contained
           Bi-Capped Bi Keggin Anion and Organic Ligand for Multifunctional Catalytic
    • Abstract: A new organic–inorganic hybrid compound contained bi-capped Bi Keggin anion, [biim][PMo 1 V Mo 11 VI Bi1.24O40]·3H2O (1) (biim = biimidazole) has been firstly synthesized and characterized by IR, UV–Vis, XRD, XPS, elemental analyses, fluorescent spectrum and TG analysis. Compound 1 exhibits a novel 2-D supramolecular network structure constructed from {PMo 1 V Mo 11 VI Bi1.24O40} anions by O···O interactions, and further extends a 3-D supramolecular framework by bridges of biimidazole with N–H···O hydrogen bonding interactions. The compound 1 performs well catalytic property for epoxidation of styrene to styrene oxide. Moreover, compound 1 displays excellent photodegradation activity for methyl orange dye.
      PubDate: 2019-03-02
      DOI: 10.1007/s10876-019-01525-8
  • Correction to: Synthesis of Plant Latex Based Hybrid Nanocarriers Using
           Surfactants for Curcumin Delivery
    • Abstract: The original version of the article unfortunately contained an error in figure 8.
      PubDate: 2019-03-01
      DOI: 10.1007/s10876-018-1481-4
  • Evaluation of Chemical and Green Synthesized Iron Oxide Nanoparticles’
           Associated Renal Toxicity in Different Experimental Models: A Comparative
    • Abstract: Magnetic nanoparticles occupy a significant class of inorganic nanoparticles with its very promising application in biosensors and bio-imaging. Physical and chemical methods have been used conventionally to prepare magnetic nanoparticles. However, these methods have its own limitations, which redirected recent research towards safe, clean and eco-friendly green synthesis approach. In our study, green magnetic iron oxide nanoparticles (FeNP DG) were prepared by using aqueous Desmodium gangeticum root extract as a reducing as well as a capping agent. Nanoparticles used in different biological milieu has to be explored for their toxicity before its application. Thus prepared nanoparticles were evaluated for its nephrotoxicity in Wistar rats (100 mg/kg b.wt), in renal epithelial cells, LLC PK1 (1 mg/ml) and isolated mitochondria (0.25, 0.5, 1 mg/ml) and compared it with the conventionally prepared iron oxide nanoparticles (FeNP Chem). Our study demonstrate that chemically prepared FeNPs are toxic to kidney and its epithelial cells.On the other hand, when the same nanoparticles were prepared by green route (FeNP DG) exhibited minimum toxicity measured via the renal markers in blood and urine along with cytotoxicity assay in LLC PK1 cells. But at mitochondrial level, both FeNP Chem and FeNP DG were found to be toxic to the organelle.
      PubDate: 2019-03-01
      DOI: 10.1007/s10876-018-01492-6
  • In Vivo Non-toxicity of Gold Nanoparticles on Wistar Rats
    • Abstract: A comparative toxicity studies were conducted with biologically and chemically synthesized gold nanoparticles (AuNPs). Biomolecules such as propanoic acid 2-(3-acetoxy-4,4,14-trimethylandrost-8-en-17-yl) (PAT) and proanthocyanidin (PAC) were used for biologically synthesized AuNPs and sodium citrate was used for chemically synthesized AuNPs. These synthesized AuNPs were characterized using UV–vis spectroscopy and Transmission electron microscopic. Rats were orally administered with PAT, PAC and citrate synthesized AuNPs at the dose of 5 mg/kg body weight for 28 days. Serum biochemical analysis, hematology and histochemical studies were carried out. The results indicated that the AuNPs synthesized using citrate induced toxicity whereas biomolecules (PAT and PAC) functionalized AuNPs did not show any toxicity. In conclusion, biologically mediated AuNPs can be used as effective as drug molecules or a carrier molecule for drug delivery.
      PubDate: 2019-03-01
      DOI: 10.1007/s10876-019-01514-x
  • Rectifying Behaviour and Photocatalytic Activity in ZnO Nanorods
           Array/Ag/CuSe Heterostructure
    • Abstract: Ag incorporated vertically aligned ZnO nanorods array/CuSe thin film (ZnO NRs/CuSe TF) have been fabricated via a solution route, thermal evaporation and magnetron sputtering process. Ternary ZnO nanorods/Ag/CuSe heterostructure was studied by X-ray diffractometry, field emission-scanning electron microscopy/energy dispersive X ray spectroscopy, current–voltage measurement and a UV–Vis–near IR spectrophotometer. The photocatalytic performance was estimated by the degradation of Rhodamine B solution under UV–Vis light irradiation. The photocatalytic efficiency of the ZnO NRs/Ag/CuSe heterostructure is higher than that of ZnO NRs/Ag and ZnO NRs/CuSe counterparts due to the robust effects of the three functional components coupling. The localized surface plasmon resonance and two Schottky junctions (e.g. Ag/ZnO and Ag/CuSe) motivates photogenerated electron–hole separation and transfer. This work presents an artificial manipulated system to enhance light harvesting, efficient charge separation and transfer, and low recombination rate in solar energy conversion.
      PubDate: 2019-03-01
      DOI: 10.1007/s10876-018-01488-2
  • Facile Synthesis of TiO 2 Nanoparticles of Different Crystalline Phases
           and Evaluation of Their Antibacterial Effect Under Dark Conditions Against
           E. coli
    • Abstract: In this paper we report the antibacterial activity in the absence of UV–Vis irradiation of TiO2 nanoparticles, in amorphous, anatase and rutile phases, obtained by the sol–gel process, on Escherichia coli strains. The synthesized TiO2 powders were characterized using X-ray diffraction (XRD), IR spectroscopy and UV–Vis absorption, as well as scanning and transmission electron microscopies. The XRD results showed that the solids were amorphous up to a temperature of 350 °C and that when subjected to heat treatments of higher temperatures, anatase crystalline phases were obtained, at 450 °C, and rutile type at temperatures higher than 770 °C, with a sub-micron particle size (< 1 μm) and varying morphology. The inactivating effect on bacteria of synthesized TiO2 was analyzed by recording the effect of its presence on bacterial strains of E. coli. To this end, the synthesized TiO2 in its amorphous (am-TiO2), anatase (a-TiO2) or rutile (r-TiO2) phases, at different concentrations, was incorporated into the E. coli cultures, placing aluminum foil over the strains to simulate darkness. Although all the phases of the TiO2 synthesized present reasonable antibacterial activity, the highest efficiency is seen in the cultures treated with r-TiO2.
      PubDate: 2019-03-01
      DOI: 10.1007/s10876-019-01500-3
  • Atomic Structures and Electronic Properties of Large-Sized Ge N Clusters (
           N  = 45, 50, 55, 60, 65, 70) by First-Principles Global Search
    • Abstract: A two-step unbiased global search was performed to explore the lowest-energy structures of large GeN clusters with N = 45–70 atoms. It has been revealed that the most stable structures for these large-sized Ge clusters are stuffed cages. Based on the lowest-energy structures, the theoretical results for the size-dependent structural transition, binding energy and ionization potential compare well with the available experimental data. Overall speaking, the structural characteristics and electronic properties of GeN clusters in the considered size range gradually approach the bulk limits, but still with certain deviations.
      PubDate: 2019-03-01
      DOI: 10.1007/s10876-019-01498-8
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