Functional Materials
Visileanu Emilia; Alexandra Gabriela Ene; Carmen Mihai; Razvan Scarlat; Catalin Grosu; Andreea Ghita
Abstract
Physical vapour deposition (EB-PVD) is a well-known technology that is widely used for the deposition of thin films regarding many demands, with a wide range of applications such as conductive textiles. It is a technique in which a high-energy electron beam is used and the metal is deposited on the surface ...
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Physical vapour deposition (EB-PVD) is a well-known technology that is widely used for the deposition of thin films regarding many demands, with a wide range of applications such as conductive textiles. It is a technique in which a high-energy electron beam is used and the metal is deposited on the surface of the substrate in the molecular form under high vacuum conditions. EB-PVD techniques have many advantages, including the high purity, efficiency and ecological nature of the process; the possibility of using substrates mainly in the form of gases and pure metals instead of expensive, complex and usually toxic chemical compounds; the possibility of producing both non-stoichiometric with different properties.In our research, the development of a primary haemostasis device designed to save the lives of combatants is based on a conductive textile substrate that was achieved by thin film deposition of Cu particles with a hybrid PVD (Physical Vapor Deposition) system, type Torr-Model No: 5X300EB-45KW. A commercial Cu target (99.999%) with a diameter of 2 inches and a thickness of 3 mm was used for deposition. The technological flow of EB-PVD deposition and working parameters for achieving Cu coating were established. The thickness of the deposited layer on textiles was 5µm. The values of electrical conductivity (S/m) obtained on 1 inch of textile surface, were 34.426,67 S/m (V1) and 6.179,15 S/m (V2) and on a 10-inch textile surface, 84.005,38 S/m (V1) and 7.961,02 S/m (V2). SEM analysis of the coated surfaces and semi-quantitative EDS chemical point analysis were performed.
Functional Materials
Christianah Adebimpe Dare; Oluokun Oluboade Oyedapo
Abstract
This study explored the effect of fermentation on the antioxidant and anti-inflammatory activities of polysaccharides from seed coat of fermented and unfermented Annona squamosa seed. Fresh and ripe sugar apple fruits were collected from a tree in Ota-Efun, Osogbo, Nigeria (07o 32’ 30.2496” ...
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This study explored the effect of fermentation on the antioxidant and anti-inflammatory activities of polysaccharides from seed coat of fermented and unfermented Annona squamosa seed. Fresh and ripe sugar apple fruits were collected from a tree in Ota-Efun, Osogbo, Nigeria (07o 32’ 30.2496” N, 04o 31’ 41.7036” E) and their identities were verified at IFE Herbarium, Department of Botany, Obafemi Awolowo, University, Ile-Ife, Nigeria. The seeds were collected and divided into two portions: fermented and unfermented. The coats of both the fermented and unfermented seeds were defatted with n-hexane separately. Polysaccharides were extracted from the defatted samples using cold and hot water procedure according to standard methods to give fermented seed coat polysaccharides and unfermented seed coat polysaccharides. Antioxidant and anti-inflammatory activities of the polysaccharides were investigated using standard methods. The reducing power, metal chelating, DPPH radical scavenging, inhibition of albumin denaturation, membrane stability potentials of the polysaccharides revealed the efficacy of the polysaccharides to take care of free radicals and maintain the integrity of the cell membrane and the fermented seed coat polysaccharide was the best. This study concluded that the polysaccharides from A. squamosa seed coat have great potential as antioxidant and anti-inflammatory agents to combat diseases related to oxidative stress, and fermentation enhanced the bioactivity of the polysaccharides.
Functional Materials
Pankaj Solanki; Mayur Vala; Sandip V. Bhatt; Dhananjay Dhruv; Bharat Kataria
Abstract
We report the results of studies on the rectifying behaviour and tunnelling conduction in GdMnO3/ZnO/STO and GdMnO3/Al:ZnO/STO thin film heterostructures comprising of p-n junctions fabricated using the Pulsed Laser Deposition (PLD) technique. A structural study using grazing angle mode XRD depicts polycrystalline ...
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We report the results of studies on the rectifying behaviour and tunnelling conduction in GdMnO3/ZnO/STO and GdMnO3/Al:ZnO/STO thin film heterostructures comprising of p-n junctions fabricated using the Pulsed Laser Deposition (PLD) technique. A structural study using grazing angle mode XRD depicts polycrystalline growth and confirms the phase purity. The AFM micrographs reveals the different grain growth and grain sizes of the prepared thin film heterostructures. Room temperature Raman spectra shows the presence of various vibrational modes in both the thin film heterostructures, the transport studies using I–V measurements at room temperature is explained using various models. The temperature dependent transport studies using I-V measurements at various temperatures reveal the rectifying behaviour and the difference in the I-V behaviour at various temperature can be understood on the basis of interface effect at the junction, which has been attributed to the presence of the various conduction phenomena through the junctions and the change in barrier height with the temperature for both presently studied thin film heterostructures.
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