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RISS 인기검색어
- 검색키워드
- 저자 : O. Aguilar-García (검색결과 3 건)
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Evaluation of Hardness and Fracture Toughness in a Porcelain Stoneware with Pseudoboehmite Additions
O. Aguilar-García,S. Bribiesca-Vazquez,J. Zárate-Medina 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.1
The effect of pseudoboehmite additions to conventional stoneware porcelain is investigated. Green compacts were formed by slip casting of stabilized aqueous suspensions and then sintering at 1,150℃, 1,200℃ and 1,250℃. The phase evolution was followed by XRD, the densification degree was calculated from densities and the microstructures were studied by SEM. Hardness, H and fracture toughness, KIC were measured by Vicker’s indentation. When vitrification occurs the presence of the pseudoboehmite leads to a extra mullitization, which has two consequences: a volume expansion resulting in a high porosity and a decrease of the amount of liquid which causes problems with the densification, by these facts the pseudoboehmite particles decrease the fracture toughness of the bodies. The effect of pseudoboehmite additions to conventional stoneware porcelain is investigated. Green compacts were formed by slip casting of stabilized aqueous suspensions and then sintering at 1,150℃, 1,200℃ and 1,250℃. The phase evolution was followed by XRD, the densification degree was calculated from densities and the microstructures were studied by SEM. Hardness, H and fracture toughness, KIC were measured by Vicker’s indentation. When vitrification occurs the presence of the pseudoboehmite leads to a extra mullitization, which has two consequences: a volume expansion resulting in a high porosity and a decrease of the amount of liquid which causes problems with the densification, by these facts the pseudoboehmite particles decrease the fracture toughness of the bodies.
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Mixture design to optimize the amount of deflocculants in aqueous porcelain precursor suspensions
O. Aguilar-García,S. Bribiesca-Vazquez,J. Zárate-Medina 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.2
The performance of dispersants poly(acrylic acid), a poly(methacrylic acid), sodium silicate, as well as binary and ternary deflocculant mixtures was compared for highly concentrated aqueous porcelain suspensions. These were formulated in ten stoneware recipes which were processed in the laboratory under fixed conditions, similar to those used in the ceramics industry, and viscosity measurements were made. The use of this methodology enabled the calculation of valid regression models (equations) relating viscosity with the contents of different deflocculant mixtures. The performance of dispersants poly(acrylic acid), a poly(methacrylic acid), sodium silicate, as well as binary and ternary deflocculant mixtures was compared for highly concentrated aqueous porcelain suspensions. These were formulated in ten stoneware recipes which were processed in the laboratory under fixed conditions, similar to those used in the ceramics industry, and viscosity measurements were made. The use of this methodology enabled the calculation of valid regression models (equations) relating viscosity with the contents of different deflocculant mixtures.
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Laura Jenet Montiel-Aguilar,Jorge Ariel Torres-Castillo,Rocío Rodríguez-Servin,Adiel Berenice López-Flores,Víctor Eustorgio Aguirre-Arzola,Gerardo Méndez-Zamora,Sugey Ramona Sinagawa-García 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.3
Edible insects have been important sources of food proteins for human consumption and animal feed. In this study, a protein isolate from Pterophylla beltrani Bolivar & Bolivar, 1942 (Orthoptera: Tettigoniidae) was enzymatically processed and its nutraceutical properties were evaluated. Protein isolates were obtained from an insect flour and then was hydrolyzed for 5 h with a sequential process using pepsin and trypsin-chymotrypsin to simulate the gastric intestinal fluids. To evaluate the effect of peptide molecular size on nutraceutical properties, the peptides obtained from Total hydrolyzed (TH) were fractionated by ultrafiltration (UF) with 10 kDa and 3 kDa UF membranes giving fractions (F) with different molecular size (F < 3KDa, F < 10KDa and F > 10KDa). The inhibition assay of Angiotensin-Converting Enzyme (ACE) showed that the best treatment (P < 0.05) was the (TH) with an IC50 value of 0.5 mg/mL while the F < 3KDa was the lowest (P < 0.05) with an IC50 of 1.44 mg/mL, and the peptide size had no effect. However, an α-amylase inhibition was observed with an increase of the IC50 value between TH, F > 10KDa and F < 10KDa although no significative difference (P > 0.05) was found between the TH and F < 3KDa with IC50 of 0.48 and 0.68 mg/mL, respectively. In antioxidant activity, significant differences (P < 0.05) were observed between TH and UF fractions where the best response was in the F < 3KDa. In conclusion, P. beltrani proteins isolate are a source of bioactive peptide, and these could be considered as potential edible insect and sustainable food with nutraceutical effects.
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