Stress distribution analysis in zirconium diboride and silica carbide (ZrB2- SiC) based thermal protection system under hypersonic flight conditions using a machine learning driven approach

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Flash Spark Plasma Sintering (FSPS) of Pure ZrB2

Export Date: 19 August 2014 CODEN: JACTA Correspondence Address: Reece, M.J.; School of Engineering and Material Science, Queen Mary University of London, London E1 4NS, United Kingdom; email: [email protected] Funding Details: EP/K008749/1, EPSRC, European Commission Funding Details: FP7 2007-2013, EC, European Commission References: Cologna, M., Rashkova, B., Raj, R., Flash Sintering of Nanograin Zirconia in <5 s at 850°C (2010) J. Am. Ceram. Soc., 93 (11), pp. 3556-3559; Downs, J.A., Sglavo, V.M., Electric Field Assisted Sintering of Cubic Zirconia at 390°C (2013) J. Am. Ceram. Soc., 96 (5), pp. 1342-1344; Muccillo, R., Muccillo, E.N.S., An Experimental Setup for Shrinkage Evaluation during Electric Field-Assisted Flash Sintering: Application to Yttria-Stabilized Zirconia (2013) J. Eur. Ceram. Soc., 33 (3), pp. 515-520; Muccillo, R., Muccillo, E.N.S., Electric Field-Assisted Flash Sintering of Tin Dioxide (2014) J. Eur. Ceram. Soc., 34 (4), pp. 915-923; Jha, S.K., Raj, R., The Effect of Electric Field on Sintering and Electrical Conductivity of Titania (2014) J. Am. Ceram. Soc., 97 (2), pp. 527-534; Zapata-Solvas, E., Bonilla, S., Wilshaw, P.R., Todd, R.I., Preliminary Investigation of Flash Sintering of SiC (2013) J. Eur. Ceram. Soc., 33 (1314), pp. 2811-2816; Grasso, S., Sakka, Y., Rendtorff, N., Hu, C., Maizza, G., Borodianska, H., Vasylkiv, O., Modeling of the Temperature Distribution of flash sintered Zirconia (2011) Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/J. Ceram. Soc. Jpn., 119 (1386), pp. 144-146; Park, J., Chen, I.W., In Situ Thermometry Measuring Temperature Flashes Exceeding 1,700°C in 8 mol% Y2O3-Stablized Zirconia under Constant-Voltage Heating (2013) J. Am. Ceram. Soc., 96 (3), pp. 697-700; Zapata-Solvas, E., Jayaseelan, D.D., Lin, H.T., Brown, P., Lee, W.E., Mechanical Properties of ZrB2- and HfB2-Based Ultra-High Temperature Ceramics Fabricated by Spark Plasma Sintering (2013) J. Eur. Ceram. Soc., 33 (7), pp. 1373-1386; Grasso, S., Sakka, Y., Maizza, G., Electric Current Activated/Assisted Sintering (ECAS): A Review of Patents 1906-2008 (2009) Sci. Technol. Adv. Mater., 10 (5), p. 053001; Mallik, M., Kailath, A.J., Ray, K.K., Mitra, R., Electrical and Thermophysical Properties of ZrB2 and HfB 2 Based Composites (2012) J. Eur. Ceram. Soc., 32 (10), pp. 2545-2555; Steil, M.C., Marinha, D., Aman, Y., Gomes, J.R.C., Kleitz, M., From Conventional Ac Flash-Sintering of YSZ to Hyper-Flash and Double Flash (2013) J. Eur. Ceram. Soc., 33 (11), pp. 2093-2101; Ortiz, A.L., Zamora, V., Rodríguez-Rojas, F., A Study of the Oxidation of ZrB2 Powders during High-Energy Ball-Milling in Air (2012) Ceram. Int., 38 (4), pp. 2857-2863; Porwal, H., Tatarko, P., Grasso, S., Hu, C., Boccaccini, A.R., Dlouhý, I., Reece, M., Toughened and Machinable Glass Matrix Composites Reinforced with Graphene and Graphene-Oxide Nano Platelets (2013) Sci. Technol. Adv. Mater., 14, p. 055007 Pure ZrB2 powder was Flash sintered in an SPS furnace (FSPS). The samples were densified up to 95.0% in 35 s under an applied pressure of 16 MPa. Compared to Conventional SPS (CSPS), the newly developed FSPS technique resulted in an unprecedented energy and time savings of about 95% and 98% respectively. ZrB2 monoliths obtained by CSPS and FSPS were compared with respect to microstructures, densification behavior, and grain growth. The developed methodology might find application to a wide range of highly conductive ceramics as such refractory borides and carbides. © 2014 The American Ceramic Society.Export Date: 19 August 2014 CODEN: JACTA Correspondence Address: Reece, M.J.; School of Engineering and Material Science, Queen Mary University of London, London E1 4NS, United Kingdom; email: [email protected] Funding Details: EP/K008749/1, EPSRC, European Commission Funding Details: FP7 2007-2013, EC, European Commission References: Cologna, M., Rashkova, B., Raj, R., Flash Sintering of Nanograin Zirconia in <5 s at 850°C (2010) J. Am. Ceram. Soc., 93 (11), pp. 3556-3559; Downs, J.A., Sglavo, V.M., Electric Field Assisted Sintering of Cubic Zirconia at 390°C (2013) J. Am. Ceram. Soc., 96 (5), pp. 1342-1344; Muccillo, R., Muccillo, E.N.S., An Experimental Setup for Shrinkage Evaluation during Electric Field-Assisted Flash Sintering: Application to Yttria-Stabilized Zirconia (2013) J. Eur. Ceram. Soc., 33 (3), pp. 515-520; Muccillo, R., Muccillo, E.N.S., Electric Field-Assisted Flash Sintering of Tin Dioxide (2014) J. Eur. Ceram. Soc., 34 (4), pp. 915-923; Jha, S.K., Raj, R., The Effect of Electric Field on Sintering and Electrical Conductivity of Titania (2014) J. Am. Ceram. Soc., 97 (2), pp. 527-534; Zapata-Solvas, E., Bonilla, S., Wilshaw, P.R., Todd, R.I., Preliminary Investigation of Flash Sintering of SiC (2013) J. Eur. Ceram. Soc., 33 (1314), pp. 2811-2816; Grasso, S., Sakka, Y., Rendtorff, N., Hu, C., Maizza, G., Borodianska, H., Vasylkiv, O., Modeling of the Temperature Distribution of flash sintered Zirconia (2011) Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/J. Ceram. Soc. Jpn., 119 (1386), pp. 144-146; Park, J., Chen, I.W., In Situ Thermometry Measuring Temperature Flashes Exceeding 1,700°C in 8 mol% Y2O3-Stablized Zirconia under Constant-Voltage Heating (2013) J. Am. Ceram. Soc., 96 (3), pp. 697-700; Zapata-Solvas, E., Jayaseelan, D.D., Lin, H.T., Brown, P., Lee, W.E., Mechanical Properties of ZrB2- and HfB2-Based Ultra-High Temperature Ceramics Fabricated by Spark Plasma Sintering (2013) J. Eur. Ceram. Soc., 33 (7), pp. 1373-1386; Grasso, S., Sakka, Y., Maizza, G., Electric Current Activated/Assisted Sintering (ECAS): A Review of Patents 1906-2008 (2009) Sci. Technol. Adv. Mater., 10 (5), p. 053001; Mallik, M., Kailath, A.J., Ray, K.K., Mitra, R., Electrical and Thermophysical Properties of ZrB2 and HfB 2 Based Composites (2012) J. Eur. Ceram. Soc., 32 (10), pp. 2545-2555; Steil, M.C., Marinha, D., Aman, Y., Gomes, J.R.C., Kleitz, M., From Conventional Ac Flash-Sintering of YSZ to Hyper-Flash and Double Flash (2013) J. Eur. Ceram. Soc., 33 (11), pp. 2093-2101; Ortiz, A.L., Zamora, V., Rodríguez-Rojas, F., A Study of the Oxidation of ZrB2 Powders during High-Energy Ball-Milling in Air (2012) Ceram. Int., 38 (4), pp. 2857-2863; Porwal, H., Tatarko, P., Grasso, S., Hu, C., Boccaccini, A.R., Dlouhý, I., Reece, M., Toughened and Machinable Glass Matrix Composites Reinforced with Graphene and Graphene-Oxide Nano Platelets (2013) Sci. Technol. Adv. Mater., 14, p. 055007 Pure ZrB2 powder was Flash sintered in an SPS furnace (FSPS). The samples were densified up to 95.0% in 35 s under an applied pressure of 16 MPa. Compared to Conventional SPS (CSPS), the newly developed FSPS technique resulted in an unprecedented energy and time savings of about 95% and 98% respectively. ZrB2 monoliths obtained by CSPS and FSPS were compared with respect to microstructures, densification behavior, and grain growth. The developed methodology might find application to a wide range of highly conductive ceramics as such refractory borides and carbides. © 2014 The American Ceramic Society.S.G. was supported by EPSRC (EP/K008749/1, XMat). T.S. was supported by EC FP7 2007-2013 (ADMACOM). O.C. was supported by CONACYT (Consejo Nacional de Ciencia y Tecnología, México)

Paper-based sensors for rapid detection of virulence factor produced by Pseudomonas aeruginosa

Pyocyanin is a toxin produced by Pseudomonas aeruginosa. Here we describe a novel paper-based electrochemical sensor for pyocyanin detection, manufactured with a simple and inexpensive approach based on electrode printing on paper. The resulting sensors constitute an effective electrochemical method to quantify pyocyanin in bacterial cultures without the conventional time consuming pretreatment of the samples. The electrochemical properties of the paper-based sensors were evaluated by ferri/ferrocyanide as a redox mediator, and showed reliable sensing performance. The paper-based sensors readily allow for the determination of pyocyanin in bacterial cultures with high reproducibility, achieving a limit of detection of 95 nM and a sensitivity of 4.30 μA/μM in standard culture media. Compared to the similar commercial ceramic based sensors, it is a 2.3-fold enhanced performance. The simple in-house fabrication of sensors for pyocyanin quantification allows researchers to understand in vitro adaptation of P. aeruginosa infections via rapid screenings of bacterial cultures that otherwise are expensive and time-consuming

Pan-cancer analysis of whole genomes

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