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Author (up) Morhell, N.; Pastoriza, H. url  doi
openurl 
  Title Power law fluid viscometry through capillary filling in a closed microchannel Type Journal Article
  Year 2016 Publication Sensors and Actuators B: Chemical Abbreviated Journal  
  Volume 227 Issue Pages 24-28  
  Keywords Microviscometer; Closed channel; Power law fluid; Non-Newtonian viscosity  
  Abstract In this work we analyze the capillary filling dynamics of non-Newtonian fluids that can be modeled with a power law constitutive equation. We solve the Poiseuille equations for an hydrophilic closed channel where capillary pressures drives the fluid in until a rest position given by the barometric pressure is reached. We show that this dynamics can be used to measure both the coefficient k and exponent n, that describes the power law fluid viscosity and we ran tests on Soda Lime Glass microchannels. Using a simple experimental setup with a USB Microscope and a custom image processing software we were able to measure the power law parameters of whole blood, wall varnish and DI water. The exponents were also obtained from the velocity profiles inside the microchannel using a custom μPIV setup matching both results with those measured with a standard Brookfield Rotational Microviscometer.  
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  Series Volume Series Issue Edition  
  ISSN 0925-4005 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ hernan @ Serial 723  
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Author (up) Morhell, N.; Pastoriza, H. url  doi
openurl 
  Title A single channel capillary microviscometer Type Journal Article
  Year 2013 Publication Microfluidics and Nanofluidics Abbreviated Journal Microfluid Nanofluid  
  Volume 15 Issue 4 Pages 475-479  
  Keywords  
  Abstract We have developed a microviscometer analyzing the fluid dynamics in a single

channel glass microfluidic chip with a closed end. The device is able to test sample

volumes of a few microliters by inserting one drop in the inlet. The fluid enters the

channel driven by capillary pressure and an optical sensor registers the motion. The

equation that describes the fluid dynamics is function of the channel geometry,

atmospheric pressure, fluid viscosity and capillary pressure. Knowing the first two the

last parameters can be obtained as fitting parameters from the meniscus position as a

function of time plot. We have successfully tested Newtonian fluids with different

viscosities and capillary pressure.
 
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1613-4990 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ hernan @ Serial 653  
Permanent link to this record
 

 
Author (up) Ogando, K.; Pastoriza, H. doi  openurl
  Title Design of integration-ready metasurface-based infrared absorbers Type Journal Article
  Year 2015 Publication Journal of Applied Physics Abbreviated Journal J. Appl. Phys.  
  Volume 118 Issue 4 Pages 043109  
  Keywords  
  Abstract We introduce an integration ready design of metamaterial infrared absorber, highly compatible with many kinds of fabrication processes. We present the results of an exhaustive experimental characterization, including an analysis of the effects of single meta-atom geometrical parameters and collective arrangement. We confront the results with the theoretical interpretations proposed in the literature. Based on the results, we develop a set of practical design rules for metamaterial absorbers in the infrared region.  
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  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ hernan @ Serial 718  
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Author (up) Ogando, K.; La Forgia, N.; Zárate, J.J.; Pastoriza, H. url  doi
openurl 
  Title Design and characterization of a fully compliant out-of-plane thermal actuator Type Journal Article
  Year 2012 Publication Sensors and Actuators A: Physical Abbreviated Journal  
  Volume 183 Issue Pages 95-100  
  Keywords Surface micro-machining; Thermal actuators  
  Abstract This paper presents the design and characterization of an out-of-plane thermal actuator. The design optimizes the vertical displacement by concentrating elastic deformations in localized hinges allowing a full thermal expansion of the actuator arms. Heating is provided by Joule dissipation in the actuator itself.

A testing device was fabricated using the Memscap PolyMUMPs process. Characterization of the sensor was performed by white light optical profilometry for varying electric biasing and different atmospheres.

The presented design has the advantage that the moving direction of the actuator can be determined by the relative location of the hinges.
 
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0924-4247 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ hernan @ Serial 646  
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Author (up) Pastoriza, H. openurl 
  Title Diagramas de fases de superconductores laminares: Estructuras de vórtices en monocristales de BiScCaCuO Type Book Whole
  Year 1994 Publication Abbreviated Journal  
  Volume Issue Pages  
  Keywords  
  Abstract  
  Address  
  Corporate Author Thesis Ph.D. thesis  
  Publisher Instituto Balseiro Place of Publication S. C. de Bariloche Editor  
  Language Summary Language Original Title  
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  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number BT @ hernan @ pastoriza94f Serial 35  
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Author (up) Pastoriza, H. openurl 
  Title Mediciones magnéticas en óxidos superconductores Type Book Whole
  Year 1989 Publication Abbreviated Journal  
  Volume Issue Pages  
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  Abstract  
  Address  
  Corporate Author Thesis Master's thesis  
  Publisher Instituto Balseiro Place of Publication S. C. de Bariloche Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ hernan @ pastoriza89b Serial 28  
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Author (up) Pastoriza, H.; Candia, S.; Nieva, G. openurl 
  Title Anisotropic vortex dynamics in twined YBaCuO single crystals Type Journal Article
  Year 2000 Publication Physica B Abbreviated Journal  
  Volume 284-288 Issue 2 Pages 763-764  
  Keywords  
  Abstract Rotating continuously the applied vortex force and measuring the vortex velocity vector, we were able to directly determine the role of twin boundaries in the vortex dynamics in YBa$2$Cu$3Ο_7$ single crystals with unidirectional twins. We show the different effect of these correlated pinning defects into the various vortex phases. In the entangled vortex liquid state, we observe a linear response but with an anisotropic viscosity. On the other hand, an anomalous guided motion by twin planes is found in the vortex solid.  
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  Notes Approved no  
  Call Number BT @ hernan @ pastoriza00 Serial 39  
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Author (up) Pastoriza, H.; Candia, S.; Nieva, G. url  openurl
  Title Role of twin boundaries on the vortex dynamics in YBaCuO single crystal Type Journal Article
  Year 1999 Publication Phys. Rev. Lett. Abbreviated Journal  
  Volume 83 Issue 5 Pages 1026-1029  
  Keywords  
  Abstract By means of a novel technique of rotating the applied current we have directly measured the influence of twin boundaries on the vortex motion in a YBa2 Cu3 O7 single crystal. The results indicate that the effect of twin planes on the vortex dynamics starts to develop below a certain temperature, being responsible for an anisotropic viscosity in the vortex liquid state and a guided motion in the solid state.  
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  Notes Approved no  
  Call Number BT @ hernan @ pastoriza99 Serial 38  
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Author (up) Pastoriza, H.; Cruz, F. de la; Mitzi, D.B.; Kapitulnik, A. url  openurl
  Title Two-step transition towards the reversibility region in Bi$2$Sr$2$CaCu$_2$O8-δ single crystals Type Journal Article
  Year 1992 Publication Phys. Rev. B Abbreviated Journal  
  Volume 46 Issue 14 Pages 9278-9281  
  Keywords  
  Abstract We have performed magnetization measurements on Bi$2$Sr$2$CaCu$_2$O8-δ single crystals in the \bf c crystallographic direction for fields from 2 Oe up to 700 Oe. The results strongly suggest that the reversible thermodynamic region is achieved after the vortex flux structure shows an abrupt transition at a temperature lower than that determined by the irreversibility line.  
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  Notes Approved no  
  Call Number BT @ hernan @ pastoriza92 Serial 29  
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Author (up) Pastoriza, H.; Goffman, M.F.; Cruz, F. de la url  openurl
  Title Comment on ``Irreversibility line of monocrystaline {Bi$2$Sr$2$CaCu$2$O$8$}: Experimental evidence for a dimensional crossover of the vortex ensemble'' Type Journal Article
  Year 1994 Publication Phys. Rev. Lett. Abbreviated Journal  
  Volume 72 Issue 8 Pages 1303  
  Keywords  
  Abstract A Comment on the Letter by A. Schilling et al., Phys. Rev. Lett. \bf 71, 899 (1993).  
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  Notes Approved no  
  Call Number BT @ hernan @ pastoriza94d Serial 33  
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