CHEMICAL & BIOMOLECULAR ENGINEERING

People

Faculty

Michael E Mackay

Michael  Mackay
  • Distinguished Professor of Materials Science & Engineering
  • Full Professor

205 DUP
University of Delaware
Newark, Delaware 19716
mem@udel.edu
302-831-302-831-6194
302-831-1048 (fax)


Education
  • Doctorate - 1985 University of Illinois-Urbana-Champaign
  • Masters - 1983 University of Illinois-Urbana-Champaign
  • Bachelors - 1979 University of Delaware

"Research in Dr. Mackay?s group concerns materials processing and the structures developed from processing effects. Most of his research centers on processing polymers using fused filament fabrication (FFF), sometimes called fused deposition modeling? or 3D printing. Our goal is to develop new materials and processing technologies to make strong products with this new polymer processing technology
We use sophisticated characterization tools such as small angle neutron scattering (SANS), a technique we have many years of experience using, to understand the structure ? property relation. This technique requires us to use deuterated polymers to measure the radius of gyration. Deuterated polystyrene is blended with protonated polystyrene using a twin screw extruder and we make the filament for FFF. After FFF we determine the radius of gyration using SANS with the aim of determining how oriented the molecules are in the product and then relate this to its strength. We are interested in generating highly oriented polymers using FFF to improve the product strength. To do this we make new polymers and polymer blends for FFF and optimize the ?hot end? of our Taz 3D printers.
The weld strength between filaments is another aspect of FFF that dictates printed product strength. We have developed heat transfer models to predict the temperature of deposited filaments, relate this to molecular diffusion at the filaments? interface and subsequently to the weld strength.
In summary, we are using sophisticated techniques to optimize a new processing technique to make the strongest products possible in the shortest amount of processing time.
We also use FFF for other uses than pure research. We use printing of lithophanes as a way to test our skills. A lithophane uses thickness to generate light and dark regions of a photograph. The figure on the left is the as-printed lithophane that shows its picture when back-lit by placing it on a window pane as shown on the right. The interplay of processing conditions and polymer properties dictates the lithophane?s contrast and sharpness"

XSelected Publications

For a complete listing of publications, please view the Full CV.
  1. Chung, W.J.; Griebel, J.J.; Kim, E.T.; Yoon, H.; Simmonds, A.G.; Ji, H.J.; Dirlam, P.T.; Glass, R.S.; Wie, J.J.; Nguyen, N.A.; Guralnick, B.W.; Park, J.; Somogyi, A.; Theato, P.; Mackay, M.E.; Sung, Y.E.; Char, K. and Pyun, J., "The use of elemental sulfur as an alternative feedstock for polymeric materials", Nature Chemistry 5, 518, (2013)
  2. Yan, C.Q.; Mackay, M.E.; Czymmek, K.; Nagarkar, R.P.; Schneider, J.P. and Pochan, D.J., "Injectable solid peptide hydrogel as a cell carrier: Effects of shear flow on hydrogels and cell payload", Langmuir 28, 6076, (2012)
  3. Keil, J.; Kirby, B.; Majkrzak, C.; Maranville, B. and Mackay M.E., "Nanoparticle concentration profile in polymer-based solar cells", Soft Matter 6, 641, (2010)
  4. Kiel, J.; Mackay, M.E.; Kirby, B.; Maranville, B. and Majkrzak, C., "Phase-sensitive neutron reflectometry measurements applied in the study of photovoltaic films", J. Chem. Phys. 133, 074902, (2010)
  5. Kiel, J.W.; Eberle, A.P.R. and Mackay, M.E., "Nanoparticle agglomeration in polymer-basedsolar cells", Phys Rev. Letters 105, 168701, (2010)
  6. A.Tuteja, P. M. Duxbury and M. E. Mackay, "Polymer chain swelling induced by dispersed nanoparticles", Phys. Rev. Letters 100, (2008)
  7. R. S. Krishnan, M. E. Mackay, P. M. Duxbury, A. Pastor, C. J. Hawker, B. Van Horn, S. Asokan and M.S. Wong, "Self-assembled multilayers of nanocomponents", Nano Letters 7, 484, (2007)
  8. J. Xu, D. A. Bohnsack, M. E. Mackay and K. L. Wooley, "Unusual Mechanical Performance of Amphiphilic Crosslinked Polymer Networks", 129, 506, (2007)
  9. A. Tuteja, M. E. Mackay, S. Narayanan, S. Asokan and M. S. Wong, "Breakdown of the continuum Stokes-Einstein relation for nanoparticle diffusion", 7, 1276, (2007)
  10. 2 E. S. McGarrity, A. L. Frischknecht, L. J. D. Frink and M. E. Mackay, "Surface-induced First Order Transition in Athermal Polymer/Nanoparticle Blends", Phys Rev Letters 99, (2007)

XPatents

XSelected Awards

For a complete listing of awards, please view the Full CV.
  1. College of Engineering Teaching Fellowship
  2. Degree with Distinction (University of Delaware)
  3. Graduate Fellowship (Chevron)
  4. Graduate Fellowship (Exxon)
  5. Chemical Engineering Graduate Fellowship
  6. College of Engineering Teaching Award (University of Queensland)
  7. Graduate Fellowship (Exxon)
  8. Society of Rheology Publication Award
  9. Max Planck Institute, Workshop Lecturer (Colloidal Processing of Ceramics)


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