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Eco-Friendly Manufacturing of Nano-TiO2 Coated Cotton Textile with Multifunctional Properties
Mirele Horsth de Paiva Teixeira,Luís Antônio Lourenço,Wagner Artifon,Celso Junior de Castro Vieira,Sergio Yesid Gómez González,Dachamir Hotza 한국섬유공학회 2020 Fibers and polymers Vol.21 No.1
In this work, multifunctional cotton fabrics were developed by immobilizing TiO2 nanoparticles (TiO2-NPs) usingan eco-friendly bath through a highly-scalable technique. The effects of TiO2-NPs, cross-linking agent, catalyst and curingtemperatures were assessed by analysis of variance and surface response methodology. The results disclose an excellentperformance of treated textiles for various applications: flame-retardant (char content enhanced by 1000 %), photocatalyticdecontamination (>90 % of contaminant abatement and feasibility for multiple reuses), self-cleaning of intense stains (up to80 % of stain vanishing), bacterial inhibition without TiO2 UV-activation (≈25 % of bacteria growth reduction). Moreover,those properties were durable for at least five domestic laundering cycles.
Pereskia aculeata Miller Flour: Metabolic Effects and Composition
Sandra Maria Barbalho,Elen Landgraf Guiguer,Paulo Sergio Marinelli,Patrı´cia Cincotto do Santos Bueno,Leticia Maria Pescinini-Salzedas,Mirele Cristine Batista dos Santos,Marie Oshiiwa,Claudemir Gregor 한국식품영양과학회 2016 Journal of medicinal food Vol.19 No.9
Pereskia aculeata Miller is known in Brazil as ora-pro-nobis (OPN) and has been used commonly in the folklore medicine. The purpose of our study was to evaluate the composition and the effects of OPN flour on the metabolic profile and intestinal motility of Wistar rats. Animals were divided randomly into five groups (n = 10): G1 (control group) and G2 (treated with OPN flour). For the intestinal motility: G3 (control group), G4 (treated with senne), and G5 (treated with OPN flour). After 40 days, G1 and G2 were euthanized and metabolic profiles were analyzed (glycemia, cholesterol, triglycerides, high density lipoprotein [HDL-c], C reactive protein, AST, ALT, Lee Index, weight, and visceral fat). The flour of OPN was effective in reducing percentage of weight gain, visceral fat, levels of total cholesterol, triglycerides, low density lipoprotein, very low density lipoprotein, and increased HDL-c. Significance was also found in the distance covered by the activated charcoal from the pylorus to the beginning of the cecum, which was higher in animals treated with OPN. Our results indicate that OPN flour may bring health benefits, as the improvement of the intestinal motility, and it is associated with reduction of visceral fat and lipid profile, as well as the increase of HDL-c levels. With these results, we may suggest that the incorporation of this flour in different industrial products may be a convenient and effective way for the intake of healthier products.
Marcela Mireles,,M.A. Quevedo Lopez 한국물리학회 2016 Current Applied Physics Vol.16 No.11
Thin films of titanium/silicon (Ti:Si) are widely employed in the electronics industry because of their metal-like characteristics. The use of films as thin film resistor (TFR) based on Ti:Si has not yet been reported. In this paper, the TFR characteristics of TiSiON with different compositions and deposited in Argon atmosphere with either 1% Oxygen or 1% Oxygen/3% Nitrogen are studied. The film composition was varied through a co-sputtering approach from titanium and silicon targets and the sheet resistance (Rsh) and temperature coefficient of resistance (TCR) were evaluated. The film composition was evaluated by X-ray photoelectron spectroscopy (XPS); carrier mobility, type and concentration by Hall effect methods and film microstructure by X-Ray diffraction. Nitrogen addition during the deposition reduces oxidized species in the TFR and increases film stability. The addition of nitrogen results in TFR films with partially oxidized titanium and silicon and TFR values closer to zero TCR without impacting film resistance. Films deposited without nitrogen result in more unstable films and larger TCR. A near-zero TCR film was found for a Ti:Si ratio of 1.6, exhibiting a Rsh at 25 C of 0.7 kOhms with a TCR value of 171 ppm/C after annealing at 450 C in forming gas.
Enrique Rocha-Rangel,Juan López-Hernández,José A. Rodríguez-García,Eddie N. Armendáriz-Mireles,Carlos A. Calles-Arriaga,W. J. Pech-Rodríguez,José A. Castillo-Robles 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.8
In this work, strontium titanate samples were prepared starting from SrCO3 and TiO2 powders mixture. Raw materials wereactivated mechanically in a planetary mill and then calcined at different temperatures (900 to 1300 oC). Powders after grindingwere analyzed by differential thermal analysis in order to follow the carbonate decomposition. On the other hand, samplesresulting from heat treatment were characterized by XRD, SEM and electrical measurements. XRD analysis determines thatSrTiO3 synthetized presents the cubic structure of perovskite. Complete reaction for SrTiO3 compound formation occurs at1200 oC. SEM observations indicate the presence of a microstructure with very small gran size and consequently a largenumber of grain boundaries. Electrical measurements suggest the formation of a material with high insulating capacity. Withthis evidence, it can be concluded that solid state reactions activated mechanically, proved to be an effective way to fabricatestrontium titanate compound with very fine microstructure and high insulating behavior.
M.E. Rivas-Aguilar,N. Hernandez-Como,G. Gutierrez-Heredia,A. Sánchez-Martínez,M. Mireles Ramirez,M.A. Quevedo-López 한국물리학회 2018 Current Applied Physics Vol.18 No.7
In this work, the specific contact resistance (ρc) between amorphous indium-gallium-zinc-oxide (IGZO) semiconductor and different contact electrodes was obtained from thin film transistors (TFTs). Ti/Au (10/100 nm), aluminum doped zinc oxide (AZO, 100 nm) and indium tin oxide (ITO, 100 nm) were used as source/drain electrodes to fabricate IGZO TFTs. Chemical states of the contacts/semiconductor interfaces were examined by depth profile X-ray photoelectron spectroscopy (XPS) analysis to explain the origin of the differences on specific contact resistance. The lowest ρc achieved using Ti/Au was related to the formation of a TiOx interlayer due to oxygen atoms diffusing out from the semiconductor under layer, increasing the carrier concentration of IGZO at the interface and lowering the ρc. On the contrary, no interfacial reactions were observed between IGZO and AZO or ITO source/drain. However, IGZO resistivity increased with ITO contacts likely due to oxygen vacancies filling during ITO deposition. This fact seems to be the origin of the high contact resistance between IGZO and ITO, compared to IGZO-AZO and IGZO-Ti/Au interfaces.
Correlation between pr1 and pr2 Gene Content and Virulence in Metarhizium anisopliae Strains
( Ninfa M Rosas Garcia ),( Osvaldo Avalos De Leon ),( Jesus M Villegas Mendoza ),( Maribel Mireles Martinez ),( J E Barboza Corona ),( J C Castaneda Ramirez ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.11
Metarhizium anisopliae is a widely studied model to understand the virulence factors that participate in pathogenicity. Proteases such as subtilisin-like enzymes (Pr1) and trypsin-like enzymes (Pr2) are considered important factors for insect cuticle degradation. In four M. anisopliae strains (798, 6342, 6345, and 6347), the presence of pr1 and pr2 genes, as well as the enzymatic activity of these genes, was correlated with their virulence against two different insect pests. The 11 pr1 genes (A, B, C, D, E, F, G, H, I, J, and K) and pr2 gene were found in all strains. The activity of individual Pr1 and Pr2 proteases exhibited variation in time (24, 48, 72, and 96 h) and in the presence or absence of chitin as the inductor. The highest Pr1 enzymatic activity was shown by strain 798 at 48 h with chitin. The highest Pr2 enzymatic activity was exhibited by the 6342 and 6347 strains, both grown with chitin at 24 and 48 h, respectively. Highest mortality on S. exigua was caused by strain 6342 at 48 h, and strains 6342, 6345, and 6347 caused the highest mortality 7 days later. Mortality on Prosapia reached 30% without variation. The presence of subtilisin and trypsin genes and the activity of these proteases in M. anisopliae strains cannot be associated with the virulence against the two insect pests. Probably, subtilisin and trypsin enzyme production is not a vital factor for pathogenicity, but its contribution is important to the pathogenicity process.