The Ewoldt Research Group
University of Illinois at Urbana-Champaign
Department of Mechanical Science and Engineering


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Book Chapter

  Ewoldt, R.H., M.T. Johnston, L.M. Caretta, "Experimental challenges of shear rheology: how to avoid bad data," In: Spagnolie, S. (ed) Complex Fluids in Biological Systems, Springer, pp.207-241 (2015)
DOI Link -- Preprint PDF (Errata marked)

Refereed Journal Publications

Submitted 51. Kumar, M. A., R. H. Ewoldt, and C. F. Zukoski, "Role of particle-solvent interaction on the onset of nonlinear mechanical responses of near hard sphere dense colloidal suspensions," submitted
2017

50. Ewoldt, R.H. and G. H. McKinley, "Mapping thixo-elasto-visco-plastic behavior," Rheologica Acta in press (2017)

49. Lee, Y. H., J. K. Schuh, R. H. Ewoldt, and J. T. Allison, "Enhancing full-film lubrication performance via arbitrary surface texture design," Journal of Mechanical Design, in press (2017)

48. Mahadik, B. P., N. A. Bharadwaj, R. H. Ewoldt, and B. A. C. Harley, "Niche cell density and hydrogel diffusivity influence feedback-mediated hematopoietic stem cell fate decisions," Biomaterials, 125, 54–64 (2017)

47. Bharadwaj, N. A., K.S. Schweizer, R.H. Ewoldt, "A strain stiffening theory for transient polymer networks under asymptotically-nonlinear oscillatory shear," Journal of Rheology, in press

46. Schuh, J. K., Y. H. Lee, J. T. Allison, R. H. Ewoldt, "Design-driven modeling of surface-textured full-film lubricated sliding: validation and rationale of non-standard thrust observations", Tribology Letters, 65(2), 1-17 (2017)
DOI Link

45. Bharadwaj, N.A., J.G. Kang, M.H. Hatzell, K.S. Schweizer, P.V. Braun, and R.H. Ewoldt, "Hard sphere colloids in a semi-flexible network of fibrin: fabrication and characterization," Soft Matter, 13(7) 1430-1443 (2017)
DOI Link

44. Blackwell, B. C., M. E. Deetjen, J. E. Gaudio, and R. H. Ewoldt, "Quantitative measures of yield-stress fluid drop impacts on coated surfaces," Atomization and Sprays, in press (2017).

2016 43. Blackwell, B. C., A. E. Nadhan, R.H. Ewoldt, "Impacts of yield-stress fluid drops on permeable meshes," Journal of Non-Newtonian Fluid Mechanics, 238, 107-114 (2016).
DOI Link

42. Porter, M.E., R.H. Ewoldt, and J.H. Long, "Automatic control: The vertebral column of dogfish sharks behaves as a continuously variable transmission with smoothly shifting functions," Journal of Experimental Biology, 219, 2908-2919 (2016).
DOI Link

41. Abdeen, A. A., J. Lee, N. A. Bharadwaj, R. H. Ewoldt, and K. A. Kilian, "Temporal Modulation of Stem Cell Activity using Magnetoactive Hydrogels," Advanced Healthcare Materials, (2016).
DOI Link

40. Kumar, M. A., R. H. Ewoldt, C. F. Zukoski, "Intrinsic Nonlinearities in the mechanics of hard sphere suspensions," Soft Matter, 23, 035102 (2016).
DOI Link

39. Jurado, L. A., H. Kim, A. Rossi, A. Arcifa, J. K. Schuh, N. D. Spencer, C. Leal, R. H. Ewoldt, R. M. Espinosa-Marzal, "Effect of the environmental humidity on the bulk, interfacial and nanoconfined properties of an ionic liquid," Physical Chemistry Chemical Physics, 18, 22719-22730 (2016).
DOI Link

38. Ewoldt, R. H., "Predictions for the northern coast of the shear rheology map: XXLAOS," Journal of Fluid Mechanics, 798, 1-4 (2016).
Invited article giving perspective to the work of A. Khair (J. Fluid Mech., vol. 791, 2016, R5)
DOI Link

37. Schuh, J. K. and R. H. Ewoldt, "Asymmetric surface textures decrease friction with Newtonian fluids in full film lubricated sliding contact," Tribology International, 97, 490-498 (2016)
DOI Link

36. Corman, R. E., L. Rao, N. A. Bharadwaj, J. T. Allison, and R. H. Ewoldt, "Setting Material Function Design Targets for Linear Viscoelastic Materials and Structures," Journal of Mechanical Design, 38(5), 051402 (2016)
DOI Link

35. Corbin, E. A., O. O. Adeniba, R. H. Ewoldt, and R. Bashir, "Dynamic mechanical measurement of the viscoelasticity of single adherent cells," Applied Physics Letters, 108, 093701 (2016)
DOI Link

34. Blackwell, B.C. and R.H. Ewoldt, "Non-integer asymptotic scaling of a thixotropic-viscoelastic model in large-amplitude oscillatory shear," Journal of Non-Newtonian Fluid Mechanics, 227, 80-89 (2016)
DOI Link

2015 33. Espinoza Santos, C.J., A. Nelson, E. Mendoza, R.H. Ewoldt, W.M. Kriven, "Design and fabrication of ceramic beads by the vibration method," Journal of the European Ceramic Society, 35 (13), p.3587-3594 (2015)
DOI Link

32. Freund, J.B., R.H. Ewoldt, "Quantitative rheological model selection: good fits versus credible models using Bayesian inference," Journal of Rheology, 59(3), 667-701 (2015)
DOI Link

31. Blackwell, B.C., M.E. Deetjen, J.E. Gaudio, R.H. Ewoldt, "Sticking and splashing in yield-stress fluid droplet impacts on coated surfaces," Physics of Fluids, 27(4), 043101 (2015)
DOI Link

30. Bharadwaj, N.A., R.H. Ewoldt, "Single-point parallel disk correction for medium-amplitude oscillatory shear," Rheologica Acta, 54(3), 223-233 (2015)
DOI Link

29. Bharadwaj, N.A., R.H. Ewoldt, "Constitutive model fingerprints in medium-amplitude oscillatory shear," Journal of Rheology, 59(2), 557-592 (2015)
DOI Link

28. Johnston, M.T., W.P. King, R.H. Ewoldt, "Shear stress characteristics of microtextured surfaces in gap-controlled hydrodynamic lubrication," Tribology International, 82, 123-132 (2015)
DOI Link

2014 27. Bharadwaj, N.A., R.H. Ewoldt "The general low-frequency prediction for asymptotically-nonlinear material functions in oscillatory shear," Journal of Rheology, 58(4), 891-910, (2014)
DOI Link

26. Martinetti, L., A.M. Mannion, W.E. Voje, R. Xie, R.H. Ewoldt, L.D. Morgret, F.S. Bates, C.W. Macosko, “A critical gel fluid with high extensibility: the rheology of chewing gum,” Journal of Rheology, 58(4), 821-838, (2014)
DOI Link

25. Blackwell, B.C., R.H. Ewoldt "A simple thixotropic-viscoelastic constitutive model produces unique signatures in large-amplitude oscillatory shear (LAOS)," Journal of Non-Newtonian Fluid Mechanics, 208, 27-41 (2014)
DOI Link

24. Roxworthy, B.J., M.T. Johnston, F.L. Montiel, R.H. Ewoldt, P.I. Imoukhuede, K.C. Toussaint, Jr. "Plasmonic optical trapping in biologically relevant media," PLoS ONE, 9(4): e93929 (2014)
DOI Link (open access)

23.Ewoldt, R.H., "Extremely soft: Design with rheologically-complex fluids," Soft Robotics, 1(1) 12-20 (2014)
Invited review for inaugural issue
DOI Link

2013 22.Johnston, M.T., R.H. Ewoldt "Precision rheometry: Surface tension effects on low-torque measurements in rotational rheometers," Journal of Rheology, 57(6), 1515-1532 (2013)
DOI Link -- Preprint PDF

21. Song, J., R.H. Ewoldt, A. Baker, C.W. Macosko, "Reactive coupling between immiscible polymer chains: Acceleration by compressive flow," AIChE Journal, 59(9), 3391-3402 (2013)
DOI Link

20. Ewoldt, R.H., N.A. Bharadwaj, "Low-dimensional intrinsic material functions for nonlinear viscoelasticity," Rheologica Acta, 52(3), 201-219 (2013)
Invited for special issue devoted to novel trends in rheology
DOI Link -- Preprint PDF

19. Ewoldt, R.H., "Defining nonlinear rheological material functions for oscillatory shear," Journal of Rheology, 57(1), 177-195 (2013)
DOI Link

18. Dimitriou, C.J., R.H. Ewoldt, G.H. McKinley, "Describing and prescribing the constitutive response of yield stress fluids using large amplitude oscillatory shear stress (LAOStress)," Journal of Rheology, 57(1), 27-70 (2013)
DOI Link

2012 17. Felts, J., S. Somnath, R.H. Ewoldt, W.P. King, "Nanometer-scale flow of molten polyethylene from a heated atomic force microscope tip," Nanotechnology, 23 (21) 215301 (2012)
DOI Link

2011 16. Galindo-Rosales, F.J., F.J. Rubio-Hernandez, A. Sevilla and R.H. Ewoldt, "How Dr. Malcom M. Cross may have tackled the development of "An apparent viscosity function for shear thickening fluids"," Journal of Non-Newtonian Fluid Mechanics, 166(23-24), 1421-1424 (2011):
DOI Link -- Preprint PDF

15. Song, J., R.H. Ewoldt, W. Hu, C. Silvis and C.W. Macosko, "Flow accelerates adhesion between functional polyethylene and polyurethane," AIChE Journal, 57(12), 3496–3506 (2011)
DOI Link

14. Ewoldt, R. H., P. Tourkine, G. H. McKinley, and A. E. Hosoi, "Controllable adhesion using field-activated fluids," Physics of Fluids, 23, 073104 (2011)
Selected to appear in the Virtual Journal of Nanoscale Science & Technology, 24(6) (2011)
DOI Link
Article PDF (Copyright 2011 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics)

13. Ewoldt, R. H., T. M. Winegard, and D. S. Fudge, "Non-linear viscoelasticity of hagfish slime," International Journal of Non-Linear Mechanics, 46(4), 627-636 (2011)
DOI Link -- Preprint PDF

12. Ng, T. S. K., G. H. McKinley, and R. H. Ewoldt, "Large amplitude oscillatory shear flow of gluten dough: A model power-law gel," Journal of Rheology, 55(3), 627-654 (2011)
DOI Link

11. Hyun, K., M. Wilhelm, C. O. Klein, K. S. Cho, J. G. Nam, K. H. Ahn, S. L. Lee, R. H. Ewoldt, and G. H. McKinley "A review of nonlinear oscillatory shear tests: Analysis and application of Large Amplitude Oscillatory Shear (LAOS)," Progress in Polymer Science, 36(12), 1697-1753 (2011)
DOI Link

2010 10. Epstein-Barash, H. G. Orbey, B. E. Polat, R. H Ewoldt, J. Feshitan, R. Langer, M. A. Borden, D. S. Kohane, "A microcomposite hydrogel for repeated on-demand ultrasound-triggered drug delivery," Biomaterials, 31(19), 5208-5217 (2010)
DOI Link

9. Ewoldt, R. H., and G. H. McKinley, "On secondary loops in LAOS via self-intersection of Lissajous-Bowditch curves" Rheologica Acta, 49(2), 213-219 (2010)
DOI Link

8. Ewoldt, R. H., P. Winter, J. Maxey, G. H. McKinley, "Large amplitude oscillatory shear of pseudoplastic and elastoviscoplastic materials" Rheologica Acta, 49(2), 191-212 (2010)
DOI Link

2005-2009 7. Celli, J.P., B. S. Turner, N. H. Afdahl, S. Keates, I. Ghiran, C. Kelly, R. H. Ewoldt, G. H. McKinley, P. So, S. Erramilli, and R. Bansil, "Helicobacter pylori moves through mucus by reducing mucin viscoelasticity," Proceedings of the National Academy of Sciences USA, (2009)
Featured as a Research Highlight in Nature Reviews Microbiology
DOI Link

6. Ewoldt, R. H., A. E. Hosoi and G. H. McKinley, "Nonlinear viscoelastic biomaterials: meaningful characterization and engineering inspiration," Integrative and Comparative Biology, 49 (1), 40-50 (2009)
DOI Link

5. Fudge, D. S., T. Winegard, R. H. Ewoldt, D. Beriault, L. Szewciw and G. H. McKinley, "From ultra-soft slime to hard alpha-keratins: The many lives of intermediate filaments," Integrative and Comparative Biology, 49 (1), 32-39 (2009)
DOI Link

4. Ewoldt, R. H., A. E. Hosoi and G. H. McKinley, "New measures for characterizing nonlinear viscoelasticity in large amplitude oscillatory shear," Journal of Rheology 52(6), 1427-1458 (2008)
DOI Link

3. Ewoldt, R. H., C. Clasen, A.E. Hosoi, and G.H. McKinley, "Rheological fingerprinting of gastropod pedal mucus and synthetic complex fluids for biomimicking adhesive locomotion," Soft Matter 3(5), 634-643 (2007)
Featured news article in Chemical Science
DOI LInk

2. J. P. Celli, B. S. Turner, N. H. Afdhal, R. H. Ewoldt, G. H. McKinley, R. Bansil, and S. Erramilli, "Rheology of gastric mucin exhibits a pH-dependent sol-gel transition," Biomacromolecules 8(5), 1580-1586 (2007)
DOI Link

1. Li, H., R. H. Ewoldt, and M.G. Olsen, "Turbulent and transitional velocity measurements in a rectangular microchannel using microscopic particle image velocimetry," Experimental Thermal and Fluid Science, 29: 435-446 (2005)
DOI Link

Technical Periodicals

2. Ewoldt R.H., A.K. Gurnon, C. López-Barrón, G.H. McKinley, J. Swan, N.J. Wagner “LAOS rheology day, Friday the 13th, Colburn Laboratory, University of Delaware,” Rheology Bulletin 81(2), (2012)
Full Text PDF

1. Ewoldt, R. H., and G.H. McKinley, “Creep ringing in rheometry or How to deal with oft-discarded data in step stress tests,” Rheology Bulletin, 76(1) (2007)
Full Text PDF (690 KB)

Proceedings Articles (Refereed)

1. Bharadwaj, N. A., J.T. Allison, and R.H. Ewoldt, “Early-stage design of rheologically-complex materials via material function design targets” Proceedings of ASME 2013 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference, paper DETC2013-13462, Portland, OR, USA, August 4-7 (2013)
Full Text PDF

Proceedings Articles (Non-Refereed)

5. Ewoldt, R. H., A. E. Hosoi and G. H. McKinley,"An Ontology for Large Amplitude Oscillatory Shear Flow," The XV International Congress on Rheology: The Society of Rheology 80th Annual Meeting, Monterey (California), AIP Conf. Proc., 1027, 1135-1137 (2008)
DOI Link -- Full Text PDF (1.35 MB)

4. Zhou, L., R. H. Ewoldt, L. P. Cook and G. H. McKinley,"Probing shear-banding transitions of entangled liquids using large amplitude oscillatory shearing (LAOS) deformations," The XV International Congress on Rheology: The Society of Rheology 80th Annual Meeting, Monterey (California), AIP Conf. Proc., 1027, 189-191 (2008)
DOI Link

3. Maxey, J., R. H. Ewoldt, P. Winter and G. H. McKinley,"Yield Stress: What is the "True" Value?," AADE Fluids Conference and Exhibition, Houston (Texas),AADE-08-DF-HO-27 (2008)

2. Ewoldt, R. H., A. E. Hosoi and G. H. McKinley, “Rheological fingerprinting of complex fluids using large amplitude oscillatory shear (LAOS) flows,” Nordic Rheology Conference, Stavanger, Norway, Annual Transactions of the Nordic Society of Rheology pp. 3-8 (2007)
Full Text PDF (3.3 MB)

1. Ewoldt, R. H., A. E. Hosoi, and G. H. McKinley, "Rheology of mucin films for Molluscan adhesive locomotion," Abstracts of Papers of the American Chemical Society, 231(387-PMSE) (2006)
Full Text PDF (870 KB)

Patent

  Martinetti, L., C.W. Macosko, R.H. Ewoldt, L.D. Morgret, “Nonlinear rheology of chewing gum and gum base,” WIPO Patent Application WO/2012/019140 (2012)

Software

  Ewoldt, R. H., P.B. Winter, and G. H. McKinley, "MITlaos," v2.1 Beta – MATLAB-based data analysis software for characterizing nonlinear viscoelastic responses to oscillatory shear strain
To request "MITlaos" (free), please contact MITlaos[at]mit[dot]edu