scholarly journals A Study on Microwave Exposure Effects on Surface Coating Properties of Linden (Tilia cordata) and Spruce (Picea abies) Woods

2021 ◽  
pp. 19-29
Author(s):  
Halil Turgut Sahin ◽  
Gamze Ozcelik
Keyword(s):  
Olive Oil ◽  
Ethyl Alcohol ◽  
Wood Species ◽  
Structural Changes ◽  
Lemon Juice ◽  
Pencil Hardness ◽  
Adhesion Properties ◽  
Microwave Exposure ◽  
Mw Irradiation ◽  
Coated Surfaces

The quality performance of surface coatings are evaluated with emphasis on Microwave (Mw) irradiation, effects on both wood and oil modified alkyd-based varnish, separately. The surface pencil film hardness value of 2B (5 in metric) found for neat varnish coated linden and spruce control samples. It appears Mw exposure on both woods and varnish were effective for further increasing pencil hardness which are about 4 and 5 unit higher than controls. It is also noticeable that a clear improvement for cross-cut (adhesion) properties were realized with Mw treated varnish coated linden woods. Although cold liquid resistance of coating evaluations have conducted with 11 liquids, but coated surfaces were showed the lowest resistance, assessed grade 1 (considerably changes) for five of these liquids (juice, milk, ketchup, lemon juice, cola)  regardless of conditions or wood species. Therefore, results revealed some level correlation between Mw conditions and wood samples for six of the cold liquids involved in the examination. Mw treated spruce samples usually show 1 to 2 unit higher olive oil, vinegar, mayonnaise, ethyl alcohol resistance while no any improvement found for coffee and mineral water. Linden samples usually show 1 to 3 unit improving (higher) resistance against all these six cold liquids, regardless of Mw conditions. It is important to note that all Mw treated and varnish applied wood species subjected to olive oil, mayonnaise and ethyl alcohol show very high resistant properties (graded 4 and 5). Similar results are also realized with applying Mw irradiated vanish to both wood species. These variations and changes could be results of chemical structural changes, including cross-linking by esterification and etherification, promoted by Mw irradiation.

Oxidative stability of olive oil–lemon juice salad dressings stabilized with polysaccharides

2007 ◽  
Vol 101 (3) ◽  
pp. 1197-1204 ◽  
Author(s):  
D. Paraskevopoulou ◽  
D. Boskou ◽  
A. Paraskevopoulou
Keyword(s):  
Oxidative Stability ◽  
Olive Oil ◽  
Lemon Juice

scholarly journals Analyses of Biofilm on Implant Abutment Surfaces Coating with Diamond-Like Carbon and Biocompatibility

2017 ◽  
Vol 28 (3) ◽  
pp. 317-323 ◽  
Author(s):  
Patricia Milagros Maquera Huacho ◽  
Marianne N. Marques Nogueira ◽  
Fernanda G. Basso ◽  
Miguel Jafelicci Junior ◽  
Renata S. Francisconi ◽  
...  
Keyword(s):  
Dental Implant ◽  
Bacterial Adhesion ◽  
Quantitative Polymerase Chain Reaction ◽  
Antimicrobial Properties ◽  
Human Keratinocytes ◽  
Diamond Like Carbon ◽  
Adhesion Properties ◽  
E Coli ◽  
Dlc Coating ◽  
Coated Surfaces

Abstract The aim of this study was to evaluate the surface free energy (SFE), wetting and surface properties as well as antimicrobial, adhesion and biocompatibility properties of diamond-like carbon (DLC)-coated surfaces. In addition, the leakage of Escherichia coli through the abutment-dental implant interface was also calculated. SFE was calculated from contact angle values; R a was measured before and after DLC coating. Antimicrobial and adhesion properties against E. coli and cytotoxicity of DLC with human keratinocytes (HaCaT) were evaluated. Further, the ability of DLC-coated surfaces to prevent the migration of E. coli into the external hexagonal implant interface was also evaluated. A sterile technique was used for the semi-quantitative polymerase chain reaction (semi-quantitative PCR). The surfaces showed slight decreases in cell viability (p<0.05), while the SFE, R a, bacterial adhesion, antimicrobial, and bacterial infiltration tests showed no statistically significant differences (p>0.05). It was concluded that DLC was shown to be a biocompatible material with mild cytotoxicity that did not show changes in R a, SFE, bacterial adhesion or antimicrobial properties and did not inhibit the infiltration of E. coli into the abutment-dental implant interface.

Artificial weathering of tropical woods. Part 1: Changes in wettability

Holzforschung ◽  
2004 ◽  
Vol 58 (5) ◽  
pp. 552-557 ◽  
Author(s):  
Masanori Kishino ◽  
Takato Nakano
Keyword(s):  
Specific Gravity ◽  
Wood Species ◽  
Structural Changes ◽  
Adsorbed Water ◽  
Acacia Auriculiformis ◽  
Hydroxyl Groups ◽  
Eucalyptus Marginata ◽  
Artificial Weathering ◽  
The Difference ◽  
Tropical Woods

Abstract Changes in the wettability of eight species of tropical woods during artificial weathering up to 600 h are discussed from the aspect of chemical and structural changes in their surfaces: Amnurana acreana, Acacia auriculiformis, Dipterocarpus spp., Eucalyptus marginata, Eucalyptus robusta, Shorea spp., and Tabebuia spp. with relatively high and low specific gravity. On the whole, the wettability of specimens decreased upon irradiation up to 20 h; above that they increased. Changes in wettability during artificial weathering differed according to wood species. The IR spectra suggest that the specimen surfaces after irradiation for 600 h result in a cellulose-rich layer, and therefore the increase in wettability during artificial weathering can be explained in terms of the increase in hydroxyl groups originating from both the exposed cellulose and adsorbed water. However, the difference in wettability exists between species even after the surface develops a cellulose-rich layer. The stereoscopic micrographs showed the development of cracks for all of the specimens after irradiation for 600 h, and differences in their magnitudes according to species. From these results, the differences in wettability between species were estimated to be due to the structural changes on the surface during artificial weathering, whereas the increase in wettability was due to the chemical changes.

Quality Changes in Marinated Anchovy (Engraulis encrasicolus) Sauced with Olive Oil-Lemon Juice Emulsions

2016 ◽  
Vol 25 (6) ◽  
pp. 905-915 ◽  
Author(s):  
Osman Kadir Topuz ◽  
Nalan Gökoğlu ◽  
Pınar Yerlikaya ◽  
İlknur Uçak
Keyword(s):  
Olive Oil ◽  
Lemon Juice ◽  
Quality Changes ◽  
Engraulis Encrasicolus

scholarly journals Insight of Weathering Processes Based on Monitoring Surface Characteristic of Tropical Wood Species

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 877
Author(s):  
Agnieszka Jankowska ◽  
Katarzyna Rybak ◽  
Malgorzata Nowacka ◽  
Piotr Boruszewski
Keyword(s):  
Wood Species ◽  
Structural Changes ◽  
Middle Lamella ◽  
Surface Characteristic ◽  
Artificial Weathering ◽  
Tropical Wood ◽  
Weathering Processes ◽  
Short Period ◽  
Wood Section ◽  
Weathering Process

The main aim of the presented research was to compare the influence of selected ageing factors, such as UV radiation and complex artificial weathering methods, on the colour, wettability and roughness changes in garapa, tatajuba, courbaril and massaranduba from South America—tropical wood species that are popular for external usage in European countries. Both processes caused wood surfaces to become darker and turn to shades of brown. The highest total colour changes were shown in courbaril wood (wood with the highest extractives content). The wood surface roughness demonstrated variation, depending on the wood section and measurement direction, and increased after ageing treatments. Changes in surface contact angle were significant after the inclusion of water and drying in the weathering process (wettability decreased). Anatomical analyses of the tested tropical woods revealed structural changes after used artificial weathering treatments (distortion between cell elements, degradation of the middle lamella, micro-cracks in cell walls, thinning and degradation of parenchyma cells, cracks along pits within vessels). As a result of desorption tension, the changes caused by UV irradiation were much smaller than those caused by full artificial weathering. Fourier-transform infrared spectroscopy (FTIR) analysis indicated the occurrence of lignin and hemicelluloses oxidative changes after the weathering process which resulted in the formation of carbonyl and carboxyl compounds. The depolymerisation of cellulose was also identified. The results show that the observed changes may affect the long-term durability of finishes applied over wood subjected to weathering factors for a short period before finishing.

scholarly journals Distilled water and ethyl alcohol boiling heat transfer on selected meshed surfaces

2019 ◽  
Vol 20 (7) ◽  
pp. 701
Author(s):  
Lidia Dąbek ◽  
Andrej Kapjor ◽  
Łukasz J. Orman
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Ethyl Alcohol ◽  
Boiling Heat Transfer ◽  
Ambient Pressure ◽  
Nucleate Boiling ◽  
Wire Mesh ◽  
Distilled Water ◽  
Nucleate Boiling Heat Transfer ◽  
Coated Surfaces

The article deals with the problem of pool boiling heat transfer enhancement on metal wire mesh coatings made of copper and phosphor bronze at nucleate boiling of distilled water and high purity ethyl alcohol under ambient pressure. The tests have been performed on horizontal samples containing different microstructures produced with the sintering technology. The samples were attached to the heating block with soldering. As a result of the experiments, boiling curves were obtained, describing the relationship between the dissipated heat flux and the superheat values for each specimen. A considerable augmentation of heat flux has been recorded for the meshed surfaces in relation to the smooth reference surface without any coating. Generally, the highest enhancement was recorded for the low superheat values. The presented test results have been discussed and then compared with selected correlations available in literature for nucleate boiling heat transfer on microstructure coated surfaces.

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