Tungsten trioxide (WO3) and molybdenum-doped tungsten trioxide (WO3:Mo) films were deposited on stainless steel surface by a chemical aqueous solution approach using dip-coating technique. The ...deposited 5, 10 and 15-layer films were homogeneous and continuous. The surface morphology and crystallinity of the produced films were dependent on the metal cation species and concentration of PVA in the solution. FE-SEM analysis revealed the formation of textured WO3 film surfaces having spike-like nanostructures. The values of the static water contact angle measured on the film surface showed that deposited WO3 films can exhibit both hydrophilic and hydrophobic nature, while WO3:Mo films showed hydrophilic behavior. Tribological properties of the deposited films were evaluated in deionized water. All three coatings retained a lubricating layer much better than original steel, demonstrating major reduction in friction and wear. Particularly effective were PVA-free WO3 films, whose friction coefficient stayed under 0.2 for over 2000 cycles. Excellent tribological, hydrophobic and hydrophilic properties along with simple deposition methods suggest very promising potential of WO3 and WO3:Mo coatings in industrial applications.
•Homogeneous WO3 and WO3:Mo films produced via chemical aqueous solution approach•Surface spike-like nanostructures (the average diameter of ~350 nm) were grown.•Solution concentration and metal cation species influence morphology.•15-layer WO3 films are hydrophobic, while WO3:Mo films - hydrophilic.•All coatings retained a lubricating layer much better than original steel.
Textured WO 3 and WO 3 Raudoniene, J.; Laurikenas, Andrius; Kaba, Meriyam M. ...
Thin solid films,
2018, Volume:
653
Journal Article
Peer reviewed
Tungsten trioxide (WO 3 ) and molybdenum-doped tungsten trioxide (WO 3 :Mo) films were deposited on stainless steel surface by a chemical aqueous solution approach using dip-coating technique. The ...deposited 5, 10 and 15-layer films were homogeneous and continuous. The surface morphology and crystallinity of the produced films were dependent on the metal cation species and concentration of PVA in the solution. FE-SEM analysis revealed the formation of textured WO 3 film surfaces having spike-like nanostructures. The values of the static water contact angle measured on the film surface showed that deposited WO 3 films can exhibit both hydrophilic and hydrophobic nature, while WO 3 :Mo films showed hydrophilic behavior. Tribological properties of the deposited films were evaluated in deionized water. All three coatings retained a lubricating layer much better than original steel, demonstrating major reduction in friction and wear. Particularly effective were PVA-free WO 3 films, whose friction coefficient stayed under 0.2 for over 2000 cycles. Excellent tribological, hydrophobic and hydrophilic properties along with simple deposition methods suggest very promising potential of WO 3 and WO 3 :Mo coatings in industrial applications.
The research deals with the contamination of feeding crops with fungi, producing mycotoxins and use of selected yeasts for detoxification. The thin-layer chromatography and ELISA methods were applied ...for the analysis of fungal secondary metabolites. The results showed a high rate of the grain contamination with fungi, mainly from genera Penicillium, Fusarium, Aspergillus and Alternaria. Some of the fungal strains produced 6-9 toxic compounds. The novelty of the study was the application of the yeast strains in detoxification of aflatoxins, zearalenon and deoxynivalenol in feed.
