Report #3

Contents

1. SU-8 Analysis
2. Micromixer Standardization Simulation
3. Hall Effect Sensor

Su-8 Analysis

(a) 820μm wide double channels (b) Double channels measured at 1X zoom

(c) 320μm wide single channels at 1X zoom (d) Single channels measured at 3X zoom

From the figure, the scale used was a 1mm unit scale. 1mm on scale = 201units ~ 200units in fig (c) For 1X zoom, the multiplication factor is 2 Therefore 1mm = 100units Which gives 1unit = 10μm Single channel thickness = 65units at 1X zoom Actual size Single channel = 325 μm

For verification on a 3X zoom, the multiplication factor is 6 Since 1mm on scale = 600 units in fig (d) Single channel thickness measured = 192units = 320 μm

Similarly for double channel At 1X thickness = 168units in fig (b) Double channel *thickness = 840μm*

(e)Micro channel at 2X zoom (f) Micro channel at 4X zoom

At 2X zoom Scale measurement was 411units for 1mm as in fig(e) So multiplication factor is 4 Channel thickness is 6units as in fig(e) Micro channel *actual size = 1.5units or *15µm.

On verification at 4X zoom Scale measurement is 778units which gives multi factor of 8 Channel thickness is 6units as in fig (e) Micro channel *actual size = .75units or *75µm.

On verification with the mask size we have

(g)Double channel mash at 1X zoom (h) Single channel mask at 3X zoom

From fig (g) At 1X zoom* Mask Double channel* thickness is 200units at factor 2 Actual thickness = 100units or 1000µm

From fig (h) At 3X zoom* Mask Single channel* thickness is 296units at factor 6 Actual thickness = 50units or 5*00µm*

From fig (i) At 3X zoom* Micro channel* thickness is 24units at factor 6 Actual thickness = 4units or 4*0µm*

(i) Micro channel mask at 3X zoom Defects in fabrication

Micromixer Standardization Simulation

• • Designed a standard mixer of pillar size 250µm which can be replicated throughout the length of the channel. The aspect ratio of which was maintained at 10 which can be implemented using SU-8.
  • Tutorial of micromixer which introduces velocity in the flow.
  • Implemented the same concept in the standard channel but was unsuccessful at it.

Hall Effect Sensor

• • Worked with Azeem Hassan in implementing the Hall Effect sensor which was presented in the group meeting.

Update 05/22/07

RF Induction Heating

• • Theory search searched for documents related to IH system used in microfluidics as well as how it is used in various applications. Will provide through report on next report.
  • Comsol Simulation of Induction Heating (next week)

Looked at some of the example simulations in COMSOL and would start working on them. Planning to gain experience with it and then introduce it to Azeem.

• • Induction coil design with Azeem (next week)

Finding the parameters required to design the coil and in the course of time make the coil

Stratergy for Azeem Research on IH fundamentals Coil Design for microfluidic applications. Application would be the heating of fluid in microchannel only, not mentioning the PCR experiment Introduction to COMSOL simulation Meantime wait for Facility connection First experiment with heating with metal pellet or piece

SU – 8 fabrication Planning to make some samples of SU-8 during the weekend

Micromixer COMSOL simulations of simple microfluidic channels for different viscosities used in the Poster Presentation. Plan to make unit mixer components in the next week.

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