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Your search keyword '"Michels, A. F."' showing total 132 results
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132 results on '"Michels, A. F."'

5. Light, Copper, Action: Visible-Light Illumination Enhances Bactericidal Activity of Copper Particles

Author

Schio, Aline L., primary, de Lima, Michele S., additional, Frassini, Rafaele, additional, Scariot, Fernando Joel, additional, Cemin, Felipe, additional, Elois, Mariana A., additional, Alvarez, Fernando, additional, Michels, Alexandre F., additional, Fongaro, Gislaine, additional, Roesch-Ely, Mariana, additional, and Figueroa, Carlos A., additional

Published
2024
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10. Zusammenfassung der Vorträge

Author

Zettl, U. K., Kallwellis, G., Schminke, U., Rieck, K., Gaida-Hommernick, B., Gaab, M. R., Rabending, G., Runge, U., Walter, U., Kloth, A., Benecke, R., Kunesch, E., Wolters, A., Classen, J., Müller, M., Jahns, R., Bauer, B., Nguento, A., Schulz, M., Hartmann, U., Herzer, R., Heinrich, A., Klampe, M., Kuehn, K. U., Schroeder, W., Armbruster, J., Abraham, G., Schattenberg, A., Gaensicke, M., Barnow, S., Herrmann, F. H., Freyberger, H. J., Mundt, B., Stutz, K., Tretzel, H., Ringel, I., Müller-Oerlinghausen, B., Weirich, S., Bischof, S., Broese, T. H., Lüdemann, W., Schicke, M., Schmid, G., Titz, K., Schläfke, D., Dudeck, M., Vogelgesang, S., Röder, H., Kessler, C. H., Fister, A., Steinhagen, V., Michels-Lucht, F., Spitzer, C., Lucht, M., Siebel, U., Bohne, S., Grossmann, A., Buchmann, J., Konnopka, K., Höppner, J., Richter, J., Gierow, W., Irmisch, G., Grabe, H. J., Alte, D., John, U., Göhre, C., Unger, D., Wartemann, U., Hässler, F., Roth, M., Gabriel, S., Vetter, P., Meyer, D.-R., Andresen, R., Zinapold, G., Veit, B., Bock, A., Gold, R., Respondek, E., Greim, B., Ruckert, S., Zettll, U. K., Krüger, T., Schoefer-Timpe, G., Wegmann, K., Stiebler, A., Nichtweiss, M., Schütte, P., Bogun, K.-R., Terstegge, K., Henkes, H., Kirsch, G., Khaw, A. V., Bleiss, A., Drach, L. M., Weidauer, S., Spreer, J., Herminghaus, S., Müller, W., and Nichtweiß, Michael

Published
2001
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16. Adhesion of Amorphous Carbon Nanofilms on Ferrous Alloy Substrates Using a Nanoscale Silicon Interlayer: Implications for Solid-State Lubrication

Author

Boeira, Carla D., primary, Cemin, Felipe, additional, Leidens, Leonardo M., additional, Weber, Jennifer S., additional, Michels, Alexandre F., additional, Aguzzoli, Cesar, additional, Serra, Ricardo, additional, Evaristo, Manuel, additional, Fernandes, Filipe, additional, Alvarez, Fernando, additional, Cavaleiro, Albano, additional, and Figueroa, Carlos A., additional

Published
2022
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17. Phototribology: Control of Friction by Light

Author

Perotti, Bruna L., primary, Cammarata, Antonio, additional, Cemin, Felipe, additional, Sales de Mello, Saron R., additional, Leidens, Leonardo M., additional, Echeverrigaray, Fernando G., additional, Minea, Tiberiu, additional, Alvarez, Fernando, additional, Michels, Alexandre F., additional, Polcar, Tomas, additional, and Figueroa, Carlos A., additional

Published
2021
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18. Analysis of dip coating processing parameters by double optical monitoring

Author

Horowitz, Flavio and Michels, Alexandre F.

Subjects
Coating processes -- Methods, Zirconium oxide -- Production processes, Silica -- Production processes, Astronomy, Physics
Abstract

Double optical monitoring is applied to determine the influence of main process parameters on the formation of sulfated zirconia and self-assembled mesoporous silica solgel films by dip coating. In addition, we analyze, for the first time to the best of our knowledge, the influence of withdrawal speed, temperature, and relative humidity on refractive-index and physical thickness variations (uncertainties of [+ or -] 0.005 and [+ or -] 7 nm) during the process. Results provide insight into controlled production of single and multilayer films from complex fluids by dip coating. OCIS codes: 310.3840, 310.6860, 260.3160.

Published
2008

19. Double optical monitoring of dip coating with a time-varying refractive index

Author

Michels, Alexandre F., Menegotto, Thiago, Grieneisen, Hans Peter H., Susin, Mauricio B., and Horowitz, Flavio

Subjects
Optical coatings -- Research, Astronomy, Physics
Abstract

A brief overview of optical monitoring for vacuum and wet-bench film-deposition processes is presented. Interferometric and polarimetric measurements are combined with regard to simultaneous monitoring of refractive index and physical thickness in real time. Monitoring stability and accuracy are verified during dip coating with a transparent oil standard. This double optical technique is applied to dip coating with a multicomponent zirconyl chloride aqueous solution, whose resulting temporal refractive-index and physical-thickness curves indicate good reproducibility as well as significant sensitivity to changes of film-flow properties during the dip-coating process. OCIS codes: 310.3840, 310.6860, 260.3160, 260.2130.

Published
2006

20. Optically monitored dip coating as a contactless viscometry method for liquid films

Author

Michels, Alexandre F., Menegotto, Thiago, and Horowitz, Flavio

Subjects
Dielectric films -- Research, Thin films -- Research, Optics -- Research, Coatings, Astronomy, Physics
Abstract

Real-time interferometric monitoring of the dip coating process is applied to the study of properties of flowing liquids. Nonvolatile Newtonian oils are considered, allowing validity of a simple model after the steady state is reached where film physical thickness depends on time as [t.sup.-1/2]. Measurement of two distinct mineral oil standards, under several withdrawing speeds, resulted in kinematic viscosities of 1.17 [+ or -] 0.03 and 9.9 [+ or -] 0.2 S (1S = 1 [cm.sup.2]/s). Agreement of these results with nominal values from the manufacturer suggests that interferometric monitoring of dip coating may become a valuable method for accurate, contactless viscometry of liquid films. Advantages and present limitations are discussed. OCIS codes: 310.3840, 310.6860, 260.3160.

Published
2005

21. Interferometric monitoring of dip coating

Author

Michels, Alexandre F., Menegotto, Thiago, and Horowitz, Flavio

Subjects
Optics -- Research, Astronomy, Physics
Abstract

Dip-coated films, which are widely used in the coating industry, are usually measured by capacitive methods with micrometric precision. For the first time to our knowledge, we have applied an interferometric determination of the evolution of thickness in real time to nonvolatile Newtonian mineral oils with several viscosities and distinct dip withdrawing speeds. The evolution of film thickness during the process depends on time as [t.sup.-1/2], in accordance with a simple model. Comparison with measured results with an uncertainty of [+ or -] 0.007 [micro]m) showed good agreement after the initial steps of the process had been completed. OCIS codes: 310.3840, 310.6860, 260.3160.

Published
2004

22. Assessment of sampling methods to estimate horseshoe crab (Limulus polyphemus L.) egg density in Delaware Bay

Author

Pooler, Penelope S., Smith, David R., Loveland, Robert E., Botton, Mark L., and Michels, Stewart F.

Subjects
Delaware Bay -- Environmental aspects, Horseshoe crabs -- Research -- Environmental aspects, Zoology and wildlife conservation, Research, Environmental aspects
Abstract

Each spring horseshoe crabs (Limulus polyphemus L.) emerge from Delaware Bay to spawn and deposit their eggs on the foreshore of sandy beaches (Shuster and Botton, 1985; Smith et al., [...]

Published
2003

24. Designing VOIP networks: lessons from the edge

Author

Michels, Matthew F.

Subjects
Computer networks -- Design and construction, Information networks, Voice-over-IP gateway, Voice over IP, Business, Business, general, Telecommunications industry
Abstract

VOIP networks aren't yet plug and play, but with the proper preparation, they can deliver high-quality service. Can you believe 'zero packet loss is an achievable goal? IP Telephony or [...]

Published
2003

32. Boekbesprekingen

Author

Schouten, D. B. J., Hofstra, H. J., Wemelsfelder, J., Bosman, H. W. J., Griffioen, W., Mey, J. L., Janssen, L. H., Oort, C. J., van Eijk, C. J., Drees, Jr., W., de Vries, Joh, Michels, J. F., de Widt, R. A., Gans, M. P., van den Akker, L. M. A., de Vries, E., Groeneveld, G. L., Kuipers, H., and Valkhoff, J.

Published
1961
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33. Adjustable Hydrophobicity of Al Substrates by Chemical Surface Functionalization of Nano/Microstructures

Author

Weibel, Daniel E., Michels, Alexandre F., Feil, Adriano F., Amaral, Lívio, Teixeira, Sérgio R., and Horowitz, Flávio

Abstract

Superhydrophobic and self-cleaning surfaces may arise due to interplay between nano/microstructures at the solid surface and the chemical properties of the topmost monolayer. In the present work, those relationships were investigated by Al substrate modifications via chemical functionalization with trimethoxypropylsilane dipping, and coating with a thin perfluorinated layer. The effect of the nano/micromorphology on the superhydrophobicity and hysteresis was studied using two main approaches: (i) chemical etching of Al substrates and chemical surface functionalization and (ii) anodic aluminum oxide template (nanoporous) generated on the etched Al substrates and functionalization as in approach i. The physical and chemical properties of the treated substrates were evaluated using water contact angle (WCA) and scanning electron microscopy and by chemical surface-sensitive techniques. The fabricated synthetic surface by approach i was superhydrophobic with a hysteresis of ∼17°. Samples prepared by approach ii showed a WCA of (165 ± 2)° with a very low hysteresis (<3°). A superhydrophobic nanostructure superimposed on a microstructure is the main cause of the self-cleaning properties obtained in the treated Al substrates.

Published
2024
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