Temat: Zinc Oxide - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Zinc oxide nanoparticles impair the integrity of human umbilical vein endothelial cell monolayer in vitro
Autorzy:: Jakubiak, Dominik
Paszek, Elżbieta
Czyż, Jarosław
Wojnarowicz, Jacek
Stępień, Ewa
Barczyk-Woźnicka, Olga
Łojkowski, Witold
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 2.

Tytuł:: Manufacturing and characterization of gellan gum – zinc oxide composites as potential biomaterials for wound treatment
Autorzy:: Macyk, Alicja
Kusibab, Anna
Pamuła, Elżbieta
Tematy:: gellan gum
zinc oxide nanoparticles
zinc oxide
microparticles
wound healing
L929 fibroblasts
cynk
fibroblasty
biomateriały; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:: https://bibliotekanauki.pl/articles/27324040.pdf Link otwiera się w nowym oknie
Opis:: This study aimed to produce gellan gum-based hydrogels with the addition of zinc oxide as a potential dressing material. Hydrogels with ZnO concentrations of 0.01%, 0.02% and 0.04% were prepared, micrometric and nanometric ZnO particles were used, and a CaCl2 crosslinker was added to one part of the samples. All samples (14 types) produced by the freeze drying method were characterized with high swelling properties (>2000%), what is important to ensure the absorption of exudates from wounds. Samples with ZnO particles cross-linked with CaCl2 lost less mass after incubation in aqueous media and were characterized by better dimensional stability than those without crosslinking. The pH of the extracts of the samples containing ZnO particles was more neutral (pH 7.0-7.6) than that of the control gellan gum samples (pH of 5.5-6.1). The zinc release from cross-linked samples was twice as high for those containing nanometric particles than for micrometric particles (1.94 ± 0.04 mg/l and 0.93 ± 0.02, respectively). Relatively large amounts of released zinc species in the case of samples containing ZnO nanoparticles are promising in the context of the antibacterial properties and treatment of infected wounds. A lower amount of zinc released from samples with ZnO microparticles could be sufficient to prevent the development of the infection. Furthermore, both materials show satisfactory cytocompatibility with L929 fibroblasts, as shown by Alamar blue and live/dead viability tests, making them prospective candidates for wound healing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: ZnO dla fotowoltaiki
ZnO for Photovoltaics
Autorzy:: Godlewski, M.
Łuka, G.
Pietruszka, R.
Wachnicki, Ł.
Witkowski, B.
Tematy:: fotowoltaika
tlenek cynku
photovoltaics
zinc oxide; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Powiązania:: https://bibliotekanauki.pl/articles/159146.pdf Link otwiera się w nowym oknie
Opis:: Mimo znaczącej redukcji kosztów paneli fotowoltaicznych (PV), cena energii wytwarzanej przez baterie słoneczne ciągle jest za wysoka. Możliwe są dwie strategie rozwiązania tej sytuacji – (a) podniesienie wydajności konwersji światła w komórkach fotowoltaicznych lub/i (b) obniżenie kosztów paneli PV poprzez zastosowanie tańszych materiałów lub technologii. W referacie omówione są prace mające na celu: (a) zastąpienie zbyt drogiego ITO warstwami ZnO o przewodnictwie metalicznym, (b) uproszczenie konstrukcji komórek PV oraz (c) znalezienie alternatywnych materiałów.
Despite of a large reductions of costs energy produced by solar panels is still too expensive. There are two approaches to change this situation: by (a) increase of device output and/or (b) reduction of device costs by use of cheaper alternative materials. In this article we discuss the latter approach – (a) replacement of ITO by ZnO with metallic conductivity, (b) change of device architecture, and (c) use of alternative materials.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Review on Multi-dimensional Zinc Oxide Nanostructures
Autorzy:: Acharyya, Sarani
Acharyya, Swarnali
Samanta, Pijus Kanti
Tematy:: Band-gap
Morphology
Semiconductor
Zinc Oxide; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/1031833.pdf Link otwiera się w nowym oknie
Opis:: Nanostructured materials are being widely investigated due to their versatile properties leading to promising applications in various areas starting from electronics to environment and medical science. Amongst the various investigated nanostructures, Zinc Oxide (ZnO) is very important because of its versatile properties like high and direct band gap, optical transparency, room temperature ferromagnetism, piezoelectric property and gas sensing property. This mini review article is focused on the morphological study of various ZnO nanostructures starting from hierarchical nanostructures to quantum dots.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Solution growth of ZnO sub-micro rods enhanced by electric field
Autorzy:: Pisarkiewicz, T.
Kenig, T.
Rydosz, A.
Maziarz, W.
Tematy:: nanowires
electrodeposition
dielectrophoretic effect
zinc oxide; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200101.pdf Link otwiera się w nowym oknie
Opis:: Recently the one-dimensional ZnO nanostructures have attracted much attention in gas sensor applications owing to their increased role of the surface. The authors have obtained ZnO rods of sub-micron size using the solution growth method with the growth temperature below 100.C. Investigations indicate that the rods have a well-defined hexagonal morphology and a wurtzite structure. The best uniformity and alignment of the sub-micron crystals was however obtained when electrodeposition from aqueous solution was developed. Sizes of these rods depend on the growth parameters. Moreover electrodeposition leads to a faster growth rate of ZnO sub-micron rods (2 hrs) as compared to the growth from solution (8 hrs). After electrodeposition the rods can be easily reoriented in external electric fields by using substrates with electrodes of appropriate geometry and configuration (dielectrophoretic effect). This enables the preparation of samples which can be used in gas sensor technology.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Temperature-dependence of cathodoluminescence of zinc oxide monolayers obtained by atomic layer deposition
Autorzy:: Witkowski, B S
Wachnicki, L
Nowakowski, P
Suchocki, A
Godlewski, M
Tematy:: zinc oxide
cathodoluminescence
profiling
temperature-dependence
localization; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/173941.pdf Link otwiera się w nowym oknie
Opis:: We performed cathodoluminescence (CL) investigations of zinc oxide monolayers obtained by atomic layer deposition. Layers of different thickness were deposited on commercial GaN/sapphire templates. Scanning electron microscopy (SEM) system equipped with CL allows direct comparison of SEM images and CL maps, taken from exactly the same areas of samples. In addition to SEM and CL images, CL profiling was performed by collecting the CL spectra at different accelerating voltages. The CL profiling allows to distinguish the emissions from a surface and volume of samples. An inter-link between samples microstructure and emission properties is investigated. Shifts of emission bands, associated by us with the localization effects, are observed. CL investigations are supported by photoluminescence (PL) measurements, which are characterized by a higher spectral resolution. PL investigations allow determination of the origin of emission bands.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Biogenic production of zinc oxide nanoparticles from aqueous extracts of Duranta erecta L.
Autorzy:: Ravindran, C. P.
Manokari, M.
Shekhawat, Mahipal S.
Tematy:: Bioreduction
Characterization
Duranta erecta
Zinc oxide nanoparticles; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/1193011.pdf Link otwiera się w nowym oknie
Opis:: The present communication reports the biosynthesis of zinc oxide nanoparticles using aqueous extracts of leaves, stem, root, flowers and fruits of Duranta erecta L. This plant gains horticultural and medicinal importance due to its various biological activities. Zinc Nitrate Hexahydrate [Zn (NO3)2•6H2O] solution was used as a precursor to synthesize Zinc oxide nanoparticles. The various plant (leaves, stem, roots, flowers, fruits) extracts played as reducing agents. The leaf extract showed strong absorbance peak at 302 nm, stem and flower peaks were located at 299 nm, roots at 293 nm and fruit extract solution peak observed at 317 nm.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Leaching of zinc from low grade oxide ore using organic acid
Autorzy:: Irannajad, M.
Meshkini, M.
Azadmehr, A. R.
Tematy:: leaching
zinc oxide ore
citric acid
smithsonite; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/110892.pdf Link otwiera się w nowym oknie
Opis:: The leaching of low grade zinc oxide mining tailings by organic acid as a leaching agent was investigated. Zinc was extracted successfully from sample by citric acid leaching. The effects of solid-to- liquid ratio, acid concentration, reaction time, temperature and ore particle size on the leaching efficiency were studied. The results obtained showed that particle sizes and reaction time had not any significant effect on the leaching recovery of zinc from smithsonite in the sizes range of 40-350 μm. Under conditions: temperature of 80ºC, reaction time of 60 min, citric acid concentration of 0.5 mol/L, and solid to liquid ratio of 1:10, 82% of zinc could be recovered.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Influence of polysorbate 80 on the flotation of zinc oxide ores with amines
Autorzy:: Xie, Qiaoling
Wang, Dandan
Han, Zhichao
Tao, Huchun
Liu, Sitong
Tematy:: polysorbate 80
pretreated amines
zinc oxide
flotation; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/2146852.pdf Link otwiera się w nowym oknie
Opis:: In this study, the influence of polysorbate 80 on zinc oxide flotation was investigated with an amine collector. The results indicated that the pretreatment of amines with polysorbate 80 enhanced the Zn grade and recovery obtained using zinc oxide flotation. Desliming prior to flotation is not suggested based on the results of this study. The appropriate temperature for flotation was as low as 8 °C, and this flotation method also could be applied to different types of zinc oxide ores. Under optimum flotation conditions, a concentrate with a Zn grade of 48.34% and a Zn recovery of 95.97% was obtained.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Zinc oxide as a functional admixture to cement composites
Autorzy:: Klapiszewska, Izabela
Ławniczak, Łukasz
Parus, Anna
Jesionowski, Teofil
Klapiszewski, Łukasz
Ślosarczyk, Agnieszka
Tematy:: zinc oxide
admixtures
cement composites
antimicrobial tests; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/2146946.pdf Link otwiera się w nowym oknie
Opis:: There is an increasing trend in the modern construction industry to use nanomaterials, which allow to improve the performance of construction materials on the one hand, and to shape new properties on the other. This study presents the results of physicomechanical and antibacterial tests for cement composites modified with zinc nanooxide. The main aim of this study was to compare the structural and morphological properties of three selected commercial zinc nanooxides and to determine the influence of the above mentioned nanooxides on the physicomechanical properties of cement composites and the ability to inhibit the activity of gram-positive and gram-negative bacteria as well as fungi. It was shown that commercial nanooxides can significantly differ in terms of physicochemical properties, which depend on their production method. Two of them were characterized by high specific surface areas, which in turn translated into rheological properties of cement mortars. Nanooxides with higher specific surface areas tend to reduce the plasticity of the mortars. According to the literature data, all nanooxides caused a delay in cement binder setting by more than 100%. This resulted in a reduction of the early one-day flexural and compressive strength of the composite. In the later curing period, especially after 7 days of hardening, a significant acceleration of the hydration process was observed in composites with the addition of all nanooxides, which was confirmed by significant increases in mechanical parameters. Nevertheless, the tested nanooxides showed different sensitivity towards microorganisms, which was influenced by both the type of nanooxide and bacteria.
Dostawca treści:: Biblioteka Nauki

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