Search results for "ZINC"
showing 10 items of 1081 documents
UN PROCEDIMENTO PER IL TRATTAMENTO DI ACCIAIO ZINCATO
2019
La zincatura viene comunemente effettuata su acciaio al carbonio per impartigli una protezione attiva, ossia una protezione catodica per anodo sacrificale, oltre che una protezione fisica di tipo barriera. La zincatura potrebbe essere utilizzata anche per barre di armature nel calcestruzzo armato nei casi in cui strutture debbano essere fabbricate in ambienti particolarmente aggressivi, quali atmosfere marine e/o industriali, dove il composito calcestruzzo/metallo può subire carbonatazione e/o attacco da cloruri. Tuttavia, la zincatura ha un effetto collaterale, ossia diminuisce l’aderenza delle barre causando problemi alla struttura. Questa controindicazione ne ha limitato l’uso in questo …
Diffusion Dialysis for Separation of Hydrochloric Acid, Iron and Zinc Ions from Highly Concentrated Pickling Solutions
2020
Acid recovery from pickling waste solutions is an important step to enhance hot-dip-galvanizing industry process sustainability. Diffusion dialysis (DD) can be used to separate acids and heavy metals (e.g., iron and zinc) from pickling waters, promoting the circular use of such raw materials. In the present study, a laboratory scale unit operating in batch and a continuous large scale unit, both equipped with Fumasep anionic exchange membranes, were tested. Results obtained show that zinc and iron concentration affect the HCl recovery in opposite ways. Iron chlorides enhance acid recovery, while zinc chlorides considerably tend to diffuse through the membrane because of negatively charged c…
In vitro antibacterial activity of endodontic sealers
2004
Summary Objectives To evaluate the antibacterial activity of four endodontic sealers: one epoxy resin sealer (AH Plus), two zinc oxide eugenol (ZOE)-based sealers (Endomethasone, Pulp Canal Sealer), and one sealer containing both ZOE and orthophenilphenol (Vcanalare). Methods A direct contact test (DCT) was performed. A 10 μl suspension of Enterococcus faecalis was placed on the test material 20 min, 24 h and 7 days after mixing. Bacteria were allowed to directly contact the sealers for 1 h at 37 °C. Bacterial growth was then spectrophotometrically measured every 30 min for 7 h, and again after 24 h as well. Results All freshly mixed sealers showed complete inhibition of bacterial growth. S…
The organic carbon derived from sewage sludge as a key parameter determining the fate of trace metals.
2007
8 pages; International audience; In a sandy agricultural soil of south-west of France, continuously cultivated with maize and amended with sewage-sludge over 20 years, the behavior of three trace metals (Cu, Pb, and Zn) was studied during the sludge applications (1974-1993) and after its cessation (1993-1998). Using the delta13C analysis, the dynamics of different sources of organic matter were followed in order to elucidate the influence of the sludge-derived organic matter on the fate of trace metals in the soil and its particle size fractions. This study revealed that sludge-derived organic matter contributed to the formation of macroaggregates through the binding of preexisting microagg…
Low-cost high-haze films based on ZnO nanorods for light scattering in thin c-Si solar cells
2015
Light scattering from ZnO nanorods (NR) is investigated, modeled, and applied to a solar cell. ZnO NR (120-1300 nm long, 280-60 nm large), grown by low-cost chemical bath deposition at 90 degrees C, exhibit diffused-to-total transmitted light as high as 70% and 30% in the 400 and 1000 nm wavelength range, respectively. Data and scattering simulation show that ZnO NR length plays a crucial role in light diffusion effect. A transparent ZnO NR film grown on glass and placed on top of a 1 mu m thick c-Si solar cell is shown to enhance the light-current conversion efficiency for wavelengths longer than 600 nm. (C) 2015 AIP Publishing LLC.
TCO/Ag/TCO transparent electrodes for solar cells application
2014
Among transparent electrodes, transparent conductive oxides (TCO)/metal/TCO structures can achieve optical and electrical performances comparable to, or better than, single TCO layers and very thin metallic films. In this work, we report on thin multilayers based on aluminum zinc oxide (AZO), indium tin oxide (ITO) and Ag deposited by RF magnetron sputtering on soda lime glass at room temperature. The TCO/Ag/TCO structures with thicknesses of about 50/10/50 nm were deposited with all combinations of AZO and ITO as top and bottom layers. While the electrical conductivity is dominated by the Ag intralayer irrespective of the TCO nature, the optical transmissions show a dependence on the natur…
Effect of Urea–Hydrogen Peroxide Content on the Photocatalytic Activity of Zinc Oxide Nanoparticles
2021
ZnO nanoparticles (NPs) were synthesized using zinc acetate dihydrate, ethanol, and oxalic acid as precursor, solvent, and complexing agent, respectively, and urea–hydrogen peroxide (UHP) as, simultaneously, nitrogen precursor and oxygen donor. The structural, morphological, textural, and optical properties of ZnO photocatalysts were investigated using different characterization methods such as XRD, SEM, BET, and UV-Vis-DRS. The XRD patterns showed that the products consisted of ZnO and revealed the presence of nitrogen. SEM images revealed the agglomeration and aggregation of NPs. The photocatalytic activity of ZnO samples was estimated based on the photo-oxidation of 2-propanol under UV i…
CCDC 781080: Experimental Crystal Structure Determination
2011
Related Article: J.-P.Collin, S.Durot, M.Keller, J.-S.Sauvage, Y.Trolez, M.Cetina, K.Rissanen|2011|Chem.-Eur.J.|17|947|doi:10.1002/chem.201002220
CCDC 949948: Experimental Crystal Structure Determination
2013
Related Article: Adrian E. Ion, Simona Nica, Augustin M. Madalan, Catalin Maxim, Miguel Julve, Francesc Lloret, Marius Andruh|2014|CrystEngComm|16|319|doi:10.1039/C3CE41592A
CCDC 976101: Experimental Crystal Structure Determination
2016
Related Article: Zouhour Denden, Wafa Harhouri, Leila Ben Haj Hassen, Yoann Rousselin, Eric Saint-Aman, Habib Nasri|2017|J.Mol.Struct.|1133|472|doi:10.1016/j.molstruc.2016.11.080