Eliphas Wagner Simões

Large Surface Area of HMDS Plasma Polymerized Thin Film Used for Production of Miniaturized Structures

The aim of this work was the production of a large surface area of hexamethyldisilazane (HMDS) plasma-deposited thin films and their applicability in a miniaturized structure useful for preliminary analysis of organic mixtures. The HMDS plasma films were produced with different surface areas and morphologies, and all films adsorbed polar and non-polar organic compounds. A low cost miniaturized structure was manufactured in glass using a Milling cutter and covered with HMDS plasma films. Good agreement was observed between simulation and experimental results on those microstructures. The observed different performance between pure and mixtures of organic compound samples suggests that the proposed system is a simple setup that could be useful for rough analysis of a fuel.

FLOW-BASED CHARACTERIZATION OF THE OPERATION OF A MICROFLUIDIC AMPLIFIER

This article analyzes the performance of jet deflection microfluidic amplifiers implemented in silicon, using microchannels with a minimum hydraulic diameter of ~40 w m. The implemented devices were characterized in terms of applications involving flow control and flow division. The implemented devices presented proportional or symmetrical behavior. For proportional control, high flow gains were obtained, similar to fluidic amplifiers with supply hydraulic diameters of hundreds of micrometers, being the average flow gain a function of supply flow. Numerical simulation analyses of the active part of the devices indicate the possibility of choked flow at the output of the supply nozzle.