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Author |
Martinez, E.D.; Lohr, J.H.; Sirena, M.; Sanchez, R.D.; Pastoriza, H. |
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Title |
Silver nanowires in poly(methyl methacrylate) as a conductive nanocomposite for microfabrication |
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Journal Article |
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Year |
2016 |
Publication |
Flexible and Printed Electronics |
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Volume |
1 |
Issue |
3 |
Pages |
035003 |
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Abstract |
A novel nanocomposite resist is presented based on AgNWs dispersed in poly(methyl methacrylate). It is shown that this nanocomposite resist displays sheet resistances below 10 Ω sq −1 for concentrations of AgNWs higher than ##IMG## [http://ej.iop.org/images/2058-8585/1/3/035003/fpeaa3d4dieqn1.gif] {$4 \% {\rm{wt}}$} and can be used for a wide range of microfabrication techniques. The resist can act as a conductive ink that cures at room temperature, form thin films with low sheet resistances, and be used in fast replication methods derived from soft lithography. Furthermore, it can be applied for nano-scale fabrication via electron beam lithography (EBL) on different substrates, including flexible and insulating materials, providing a straightforward method to avoid charging effects. This, being the first report about a nanocomposite resist based on AgNWs for EBL, describes a simple procedure to account for suspended nanowires, forming bridges, nanocantilevers and more complex nanostructures. A wide range of opportunities opens for the single-step fabrication of electronic components in the nano and micro scale. |
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2058-8585 |
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Call Number  |
BT @ hernan @ |
Serial |
733 |
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Author |
Salazar Alarcón, L. and Martínez,E. D. and Rodríguez, L. M. and Pastoriza, H. |
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Title |
Topographical and Physicochemical Contrast in Photopatterned SU-8 Films for Microfabrication of Multilayer Structures |
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Journal Article |
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Year |
2016 |
Publication |
Advances in Materials Science and Engineering |
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2016 |
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Pages |
5278102 |
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Abstract |
During SU-8 standard photolithography process, a patterned topography is formed with a characteristic height profile produced by the different shrinkage of the UV exposed and masked regions. We study the change of wettability, film solubility, and topographic modifications on SU-8 films of different thicknesses and show its relevance in the formation of spinning-flow arrays on top layers made from positive photoresists. Also, considerable contrast in film solubility and surface energy as observed from contact angle measurements is produced. Interface diffusion of the photoresists was also observed and followed by Rutherford Back Scattering. We discuss the derivations of the mentioned effects concerning the limitations to multilayered microfabrication processes and possibilities to take advantage of the surface profiles obtained. |
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Hindawi |
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1687-8434 |
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BT @ hernan @ |
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731 |
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Author |
del Corro, P. G.; Imboden, M.; Bishop, D. J.; Pastoriza, H. |
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Title |
Comb Drive Designs With Minimized Levitation |
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Journal Article |
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Year |
2016 |
Publication |
Journal of Microelectromechanical Systems |
Abbreviated Journal |
Journal of Microelectromechanical Systems |
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Volume |
25 |
Issue |
6 |
Pages |
1025-1032 |
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Keywords |
driver circuits; electrostatic actuators; microfabrication; Mems; capacitive comb drive design; comb finger polarity; comb geometry optimization; control electrode; distance 3.6 mum; electric field; electrostatic actuation; levitation effect elimination; polyMUMP technology; vertical force suppression; voltage 80 V; Capacitance; Force; Levitation; Micromechanical devices; Mobile communication; Springs; Substrates; Mems; actuators; comb drives; levitation |
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Abstract |
This paper presents two capacitive comb drive
designs for electrostatic actuation of MEMS with the aim to
eliminate the levitation effect often observed in such systems.
By placing a shield over the comb drive fingers, it is possible
to balance the electric field and suppress vertical forces while
maintaining the desired lateral motion. By optimizing the comb
geometry, we demonstrate that our approach is able to reduce the
levitation by an order of magnitude and unwanted coupling of
motion from out-of-plane to in-plane by a factor of 7 compared
with standard comb architectures fabricated using PolyMUMPs
technology, without the need of alternating comb finger polarities
or additional control electrodes. Levitation was reduced to
160 nm, for 3.6-µm lateral displacement at a driving voltage
of 80 V. |
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1057-7157 |
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Call Number |
BT @ hernan @ |
Serial |
744 |
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Author |
Morhell, N.; Pastoriza, H. |
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Title |
Power law fluid viscometry through capillary filling in a closed microchannel |
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Journal Article |
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Year |
2016 |
Publication |
Sensors and Actuators B: Chemical |
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227 |
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24-28 |
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Keywords |
Microviscometer; Closed channel; Power law fluid; Non-Newtonian viscosity |
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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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ISSN |
0925-4005 |
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BT @ hernan @ |
Serial |
723 |
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Author |
Franco, D.G.; Sarmiento-Chavez, A.; Schenone, N.; Allcca, A.E.L.; Berisso, M.G.; Fasano, Y.; Guimpel, J. |
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Title |
Characterization of the Nb-B Superlattice System |
Type |
Journal Article |
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Year |
2016 |
Publication |
Physica C: Superconductivity and its Applications |
Abbreviated Journal |
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Volume |
531 |
Issue |
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Pages |
93-97 |
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Superlattice; Superconductivity; Transition Edge Sensors |
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Abstract
We study the growth, stacking and superconducting properties of Nb and B thin films and superlattices. The interest in these resides in their possible use in transition edge neutron sensors. The samples were grown by magnetron sputtering over Si (100) substrates. The X-ray diffraction patterns for all Nb containing samples show a Nb (110) preferential orientation. From the low-angle X-ray reflectivity we obtain information on the superlattice structure. The superconducting transition temperatures of the superlattices, obtained from the temperature dependence of the magnetization, are higher than those of single Nb films of similar thickness. The temperature dependence of the perpendicular and parallel upper critical fields indicate that the superlattices behave as an array of decoupled superconducting Nb layers. |
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0921-4534 |
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BT @ jguimpel @ |
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743 |
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Author |
Sereni, J.G. |
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Title |
Magnetic Systems: Specific Heat |
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Journal Article |
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Year |
2016 |
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Reference Module in Materials Science and Materials Engineering |
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2016 |
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4986 |
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BT @ pedrazp @ |
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759 |
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Author |
Sereni, J. G. |
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Title |
La investigación: una historia de nunca acabar |
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2016 |
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Ciencia e Investigación, Reseñas |
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4 |
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47 |
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BT @ pedrazp @ |
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760 |
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Pérez, M.; Lipovetzky, J.; Sofo Haro, M.; Sidelnik, I.; Blostein, J. J.; Alcalde Bessia, F.; Gómez Berisso, M. |
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Particle detection and classification using commercial off the shelf CMOS image sensors |
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2016 |
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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
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827 |
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171 |
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754 |
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Dellavale, D.; Roselló, J. M. |
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Cross-frequency coupling and phase synchronization in nonlinear acoustics |
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2016 |
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Proceedings of Meetings on Acoustics |
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28 |
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055001 |
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755 |
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Schmoranzer, D., Jackson,M., Zemma, E., Luzuriaga,J. |
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Title |
Double-Paddle Oscillators as Probes of Quantum Turbulence in the Zero Temperature Limit |
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2016 |
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Journal of Low Temperature Physics |
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185 |
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745 |
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