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  Dept of Chemical Engineering
Carnegie Mellon University
5000 Forbes Avenue
Pittsburgh, PA 15213-3890 USA
Phone: (412) 268 - 2230
Fax: (412) 268 - 7139 		 
 
People
 

Carnegie Mellon 1992-

Postdoctoral, Physical Chemistry, Royal Institute of Technology , Stockholm, 1991-1992

Ph.D., ChE, 1991, Stanford University

M.S., ChE, 1987, Stanford University

B.Ch.E., ChE, 1986, University of Delaware

Robert D. Tilton
Professor of Chemical Engineering and Biomedical Engineering


Office: Doherty Hall 3111
Phone: (412) 268-1159
Fax: (412) 268-7139
Email: tilton@andrew.cmu.edu
Secretary: Shirley Pavlischak
    Phone: (412) 268-2251
    Fax: (412) 268-2183
    Email: shirleyp@andrew.cmu.edu

Biography
Research Interests
Highlights
Awards and Honors
Publications
Research Group Site
Center for Complex Fluids Engineering

Biography

A member of the faculty since 1992, Professor Robert Tilton holds a joint appointment in the Department of Chemical Engineering and in the Department of Biomedical Engineering and serves as Director of the Center for Complex Fluids Engineering. He earned the B.Ch.E. from the University of Delaware in 1986, and the M.S. and Ph.D. in Chemical Engineering from Stanford University in 1987 and 1991, respectively. His Ph.D. research was supervised by Professors Alice Gast and Channing Robertson and was recognized by the 1993 Victor K. LaMer Award for Outstanding Graduate Research in Colloid and Surface Chemistry from the American Chemical Society. Following his Ph.D. he conducted postdoctoral research in the Department of Physical Chemistry at the Royal Institute of Technology in Stockholm, Sweden.

Professor Tilton is a member of the NIH Nanotechnology Study Section and currently serves as Scientific Council to CODIRECT, the Institute Excellence Centre for Controlled Release and Delivery at the Institute for Surface Chemistry in Stockholm. He has held several leadership positions in the American Chemical Society Division of Colloid and Surface Chemistry, including Victor K. LaMer Award Committee Chair, Symposium Committee Chair, and Division Vice-Chair, Chair-Elect and Chair. He now serves on the Executive Committee as the Immediate Past Chair. In 2001 he co-chaired the ACS Colloid and Surface Science Symposium at Carnegie Mellon University.


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Research Interests

Research in Professor Tilton's group addresses biopharmaceutical formulations, microfluidic biotechnologies, and nanotechnologies for environmental remediation, as well as fundamental studies of the influence of surfaces on macromolecular structure, dynamics and function. These diverse applications are linked in the sense that each of them is controlled by interfacial physical chemistry. The following are examples of current projects.

Microfluidic Cell Sorting
Micropatterned electrode technologies are being developed to sort different cell types, vesicles and/or colloidal particles in microfluidic devices. Cells adopt particular locations in nonuniform fields based on a coupling of dielectrophoretic and electrohydrodynamic forces. In this way, cell mixtures can be sorted for diagnostic purposes on the basis of differences in their dielectric properties. These ideas are being extended to microfluidic bioreactors based on biofunctionalized colloids and vesicles.

Targeted Remediation of Chlorinated Solvent Residuals in Groundwater
Inspired by targeted drug delivery technologies, Prof. Tilton's group is developing polymer-functionalized iron nanoparticles that transport through microporous aquifers and preferentially accumulate at the interface between water and chlorinated organic solvent residuals. This effectively concentrates the contaminant remediation at the underground source, promising more rapid decontamination than current "pump and treat" technologies can offer.

PEG-Modified Proteins
The pharmaceutical efficacy of many protein therapeutics is significantly enhanced by grafting poly(ethylene glycol) chains to the proteins. We are investigating how PEG modification alters the underlying colloidal and interfacial behaviors of proteins and using the information to optimally formulate PEG-proteins for sustained release drug delivery.


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Highlights

  • Elected by the members of the American Chemical Society Division of Colloid and Surface Chemistry to serve a three year term as Councilor.

  • Designed new Biomedical Engineering undergraduate advising system as Chair of the BME Undergraduate Affairs Committee, whereby first and second year BME majors are assigned to a general advisor to ensure proper entry into the major, after which they transition in year three to an advisor who provides specific expertise related to students’ chosen tracks.

  • Conceived and implemented a new Self-Defined Biomedical Engineering track for BME majors as Chair of the BME Undergraduate Affairs Committee, allowing students with strong interests in a BME specialty area not represented by current tracks to propose and complete an appropriate track.

  • Developed polymer-grafted nanoparticulate emulsifiers that produce thermally responsive emulsions that are stable for many months until triggered to break rapidly when heated above a threshold temperature.

  • Expanded the scope of ongoing nanoscale zero valent iron (NZVI) environmental remediation technology research to explicitly determine its effects on natural microbial diversity. Initial results of microcosm studies indicate only a minor effect on biodiversity and possible bio-stimulatory effect when NZVI is delivered with biodegradable polymers.


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Awards and Honors

  • Fellow of the American Chemistry Society 2010

  • Member of Nanotechnology Study Section, National Institutes of Health, 2009-2013

  • YKI Ambassador, Institute for Surface Chemistry, Stockholm, Sweden, 2005

  • Fourth Annual National Academy of Engineering Symposium on Frontiers of Engineering, invited participant, 1998

  • National Science Foundation Career Award, 1996

  • George Tallman Ladd Award for Excellence in Research, Carnegie Mellon University, 1995

  • Victor K. LaMer Award, American Chemical Society Division of Colloid and Surface Chemistry, 1993

  • DuPont Outstanding Young Faculty Award, 1992

  • Chevron Fellow, Stanford University, 1987-1988

  • Davis Fellow, Stanford University, 1986-1987

  • Engineering Alumni Association Award, University of Delaware, 1986

  • Tau Beta Pi Engineering Honor Society, 1985

  • Phi Kappa Phi Interdisciplinary Honor Society, 1985

  • Diamond Shamrock Corporation Scholarship, University of Delaware, 1985-1986

  • Sharp Scholarship, University of Delaware, 1985-1986

  • Junior Engineering Research Scholarship, University of Delaware, 1984-1985

  • National Merit Scholarship, University of Delaware, 1982-1986


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Publications

       Recent Publications

       Selected Publications

       Full Publications


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Recent Publications

M. Lundin, E. Blomberg, R.D. Tilton, “Polymer dynamics in layer-by-layer assemblies of chitosan and heparin,” Langmuir 26, 3242-3251 (2010). DOI: 10.1021/la902968h

J.K. Lim, H. Zhou, R.D. Tilton, “Liposome Rupture and Contents Release over Coplanar Microelectrode Arrays,” Journal of Colloid and Interface Science 332, 113-121 (2009).

S.S. Pai, R.D. Tilton, T.M. Przybycien, “Poly(ethylene glycol)-Modified Proteins: Implications for Poly(lactide-co-glycolide)-Based Microsphere Delivery,” The AAPS Journal 11, 88-98 (2009) DOI: 10.1208/s12248-009-9081-8

J.K. Lim, D.X. Tan, F. Lanni, R.D. Tilton, S.A. Majetich, “Optical imaging and magnetophoresis of nanorods,” Journal of Magnetism and Magnetic Materials 321, 1557-1562 (2009) DOI:10.1016/j.jmmm.2009.02.085.

T. Phenrat, Y. Liu, R.D. Tilton, G.V. Lowry, “Adsorbed polyelectrolyte coatings decrease Fe0 nanoparticle reactivity with TCE in water: conceptual model and mechanisms,” Environmental Science and Technology, 43, 1507-1514 (2009). DOI: 10.1021/es802187d

K.M. Sirk, N.B. Saleh, T. Phenrat, H.-J. Kim, B. Dufour, J. Ok, P.L. Golas, K. Matyjaszewski, G.V. Lowry, R.D. Tilton, “Effect of Adsorbed Polyelectrolytes on Nanoscale Zero Valent Iron Particle Attachment to Soil Surface Models,” Environmental Science and Technology 43, 3803-3808 (2009). DOI: 10.1021/es803589t

H.J. Kim, T. Phenrat, R.D. Tilton, G.V. Lowry “Fe0 nanoparticles remain mobile in porous media after aging due to slow desorption of polymeric surface modifiers,” Environmental Science and Technology 43, 3824-3830 (2009). DOI: 10.1021/es802978s

T. Phenrat, H.-J. Kim, F. Fagerlund, T. Illangaskare, R.D Tilton, G.V. Lowry, “Particle Size Distribution, Concentration, and Magnetic Attraction Affect Transport of Polymer-modified Fe0 Nanoparticles in Sand Columns,” Environmental Science and Technology 43, 5079-5085 (2009). DOI: 10.1021/es900171v

J.K. Lim, S.A. Majetich, R.D. Tilton, “Stabilization of superparamagnetic iron oxide core – gold shell nanoparticles in high ionic strength media,” Langmuir 25, 13384–13393 (2009). DOI: 10.1021/la9019734

M. Matos, L.R. White, R.D. Tilton, "Enhanced mixing in polyacrylamide gels containing embedded silica nanoparticles as internal electroosmotic pumps,” Colloids and Surfaces B: Biointerfaces 61, 262-269 (2008).

T. Phenrat, N. Saleh, K. Sirk, H.-J. Kim, R.D. Tilton, G.V. Lowry, “Stabilization of aqueous nanoscale zerovalent iron dispersions by anionic polyelectrolytes: adsorbed anionic polyelectrolyte layer properties and their effect on aggregation and sedimentation,” Journal of Nanoparticle Research, 10, 795-814 (2008).

J.K. Lim, R.D. Tilton, A. Eggeman, F. Lanni, S.A. Majetich, “Synthesis and single particle optical detection of low polydispersity plasmonic-superparamagnetic nanoparticles,” Advanced Materials 20, 1721-1726 (2008).

N. Saleh, H.-J. Kim, T. Phenrat, K. Matyjaszewski, R.D. Tilton, G.V. Lowry, “Ionic strength and composition affect the mobility of surface-modified Fe0 nanoparticles in water-saturated sand columns,” Environmental Science and Technology, 42, 3349-3355 (2008).

A.L. Marcinkowski, S. Garoff, R.D. Tilton, J.M. Pilewski, T.E. Corcoran, “Post-deposition dispersion of aerosol medications using surfactant carriers,” Journal of Aerosol Medicine and Pulmonary Drug Delivery 21, 981-989 (2008).

J.K. Lim, H. Zhou, R.D. Tilton, “Liposome Rupture and Contents Release over Coplanar Microelectrode Arrays,” Journal of Colloid and Interface Science 332, 113-121 (2009).

S.S. Pai, R.D. Tilton, T.M. Przybycien, “Poly(ethylene glycol)-Modified Proteins: Implications for Poly(lactide-co-glycolide)-Based Microsphere Delivery,” AAPS Journal 11, 88-98(2009).

J.K. Lim, D.X. Tan, F. Lanni, R.D. Tilton, S.A. Majetich, “Optical imaging and magnetophoresis of nanorods,” Journal of Magnetism and Magnetic Materials 321, 1557-1562 (2009).

T. Phenrat, Y. Liu, R.D. Tilton, G.V. Lowry, “Adsorbed polyelectrolyte coatings decrease Fe0 nanoparticle reactivity with TCE in water: conceptual model and mechanisms,” Environmental Science and Technology, 43, 1507-1514 (2009).

K.M. Sirk, N.B. Saleh, T. Phenrat, H.-J. Kim, B. Dufour, J. Ok, P.L. Golas, K. Matyjaszewski, G.V. Lowry, R.D. Tilton, “Effect of Adsorbed Polyelectrolytes on Nanoscale Zero Valent Iron Particle Attachment to Soil Surface Models,” Environmental Science and Technology 43, 3803-3830(2009).

H.J. Kim, T. Phenrat, R.D. Tilton, G.V. Lowry “Fe0 nanoparticles remain mobile in porous media after aging due to slow desorption of polymeric surface modifiers,” Environmental Science and Technology 43, 3824-3830 (2009).

T. Phenrat, H.-J. Kim, F. Fagerlund, T. Illangaskare, R.D Tilton, G.V. Lowry, “Particle Size Distribution, Concentration, and Magnetic Attraction Affect Transport of Polymer-modified Fe0 Nanoparticles in Sand Columns,” Environmental Science and Technology 43, 5079-5085 (2009).

J.K. Lim, S.A. Majetich, R.D. Tilton, “Stabilization of superparamagnetic iron oxide core – gold shell nanoparticles in high ionic strength media,” Langmuir Articles ASAP, July 31, 2009.


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Selected Publications

M. Lundin, E. Blomberg, R.D. Tilton, “Polymer dynamics in layer-by-layer assemblies of chitosan and heparin,” Langmuir 26, 3242-3251 (2010). DOI: 10.1021/la902968h

J.K. Lim, H. Zhou, R.D. Tilton, “Liposome Rupture and Contents Release over Coplanar Microelectrode Arrays,” Journal of Colloid and Interface Science 332, 113-121 (2009).

S.S. Pai, R.D. Tilton, T.M. Przybycien, “Poly(ethylene glycol)-Modified Proteins: Implications for Poly(lactide-co-glycolide)-Based Microsphere Delivery,” The AAPS Journal 11, 88-98 (2009) DOI: 10.1208/s12248-009-9081-8

J.K. Lim, D.X. Tan, F. Lanni, R.D. Tilton, S.A. Majetich, “Optical imaging and magnetophoresis of nanorods,” Journal of Magnetism and Magnetic Materials 321, 1557-1562 (2009) DOI:10.1016/j.jmmm.2009.02.085.

T. Phenrat, Y. Liu, R.D. Tilton, G.V. Lowry, “Adsorbed polyelectrolyte coatings decrease Fe0 nanoparticle reactivity with TCE in water: conceptual model and mechanisms,” Environmental Science and Technology, 43, 1507-1514 (2009). DOI: 10.1021/es802187d


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Full Publications

(Peer-Reviewed Archival Journal Articles)

  1. R.D. Tilton, C.R. Robertson and A.P. Gast, “Lateral Diffusion of Bovine Serum Albumin Adsorbed at the Solid-Liquid Interface,” J. Colloid Interface Sci. 137, 192 (1990).

  2. R.D. Tilton, A.P. Gast and C.R. Robertson, “Surface Diffusion of Interacting Proteins: Effect of Concentration on the Lateral Mobility of Adsorbed Bovine Serum Albumin,” Biophys. J. 58, 1321 (1990).

  3. R.D. Tilton, C.R. Robertson and A.P. Gast, “Manipulation of Hydrophobic Interactions in Protein Adsorption,” Langmuir 7, 2710 (1991).

  4. T.E. Rabe and R.D. Tilton, “Surface Diffusion of Adsorbed Proteins in the Vicinity of the Substrate Glass Transition Temperature,” J. Colloid Interface Sci. 159, 243 (1993).

  5. R.D. Tilton, E. Blomberg and P.M. Claesson, “The Effect of Anionic Surfactant Binding on the Interaction between Adsorbed Layers of Lysozyme on Mica,” Langmuir 9, 2102 (1993).

  6. E. Blomberg, P.M. Claesson, J.C. Fröberg and R.D. Tilton, “The Interaction between Adsorbed Layers of Lysozyme Studied with the Surface Force Technique,” Langmuir 10, 2325 (1994).

  7. E. Blomberg, P.M. Claesson and R.D. Tilton, “Short-Range Interaction between Adsorbed Layers of Human Serum Albumin,” J. Colloid Interface Sci. 166, 427 (1994).

  8. J.L. Robeson and R.D. Tilton, “Effect of Concentration Quenching on Fluorescence Recovery After Photobleaching Measurements,” Biophys. J. 68, 2145 (1995).

  9. J.R. Charron and R.D. Tilton, “A Scanning Angle Reflectometry Investigation of Block Copolymer Adsorption to Insoluble Lipid Monolayers at the Air-Water Interface,” J. Phys. Chem. 100, 3179 (1996).

  10. E.M. Furst, E.S. Pagac, and R.D. Tilton, “Coadsorption of Polylysine and the Cationic Surfactant Cetyltrimethylammonium Bromide on Silica,” Ind. Eng. Chem. Res. 35, 1566 (1996).

  11. E.S. Pagac, R.D. Tilton and D.C. Prieve, “Hindered Mobility of a Rigid Sphere Near a Wall,” Chem. Eng. Commun. 148-150, 105 (1996).

  12. J.L. Robeson and R.D. Tilton, “Spontaneous Reconfiguration of Adsorbed Lysozyme Layers Observed by Total Internal Reflection Fluorescence with a pH-Sensitive Fluorophore,” Langmuir, 12, 6104 (1996).

  13. E.S. Pagac, D.C. Prieve, Y. Solomentsev and R.D. Tilton, “A Comparison of Polystyrene-Poly(ethylene oxide) Diblock Copolymer and Poly(ethylene oxide) Homopolymer Adsorption from Aqueous Solutions,” Langmuir, 13, 2993-3001 (1997).

  14. J.R. Charron and R.D. Tilton, “Penetration of Insoluble Lipid Monolayers at the Air-Water Interface by Water-Soluble Block Copolymers and Homopolymers,” Langmuir 13, 5524 (1997).

  15. E.S. Pagac, D.C. Prieve and R.D. Tilton, “Kinetics and Mechanism of Cationic Surfactant Adsorption and Coadsorption with Cationic Polyelectrolytes at the Silica-Water Interface,” Langmuir 14, 2333 (1998).

  16. E.S. Pagac, R.D. Tilton and D.C. Prieve, “Depletion Attraction Caused by Unadsorbed Polyelectrolytes,” Langmuir 14, 5106 (1998).

  17. J.-H. Kim, M.M. Domach and R.D. Tilton, “Solubilization Capacity of Pyrene in Octaethylene Glycol Monododecyl Ether Micelles,” Colloids Surf. A Physicochem. Eng. Aspects 150, 55 (1999).

  18. S. M. Butler, M. A. Tracy and R.D. Tilton, “Adsorption of Serum Albumin to Thin Films of Poly(lactide-co-glycolide),” J. Controlled Release 58, 335 (1999).

  19. E.F. Tsung and R.D. Tilton, “Measurement of Catalytic Reaction Kinetics for Adsorbed Enzyme Monolayers,” J. Colloid Interface Sci. 213, 208 (1999).

  20. J.-H. Kim, M.M. Domach, R.D. Tilton, “Pyrene Micropartitioning and Solubilization by Sodium Dodecyl Sulfate Complexes with Poly(ethylene glycol),” J. Phys. Chem. B, 103, 10582 (1999).

  21. S.B. Velegol, B.D. Fleming, S. Biggs, E.J. Wanless, R.D. Tilton, “Counterion Effects on Hexadecyltrimethylammonium Surfactant Adsorption and Self-Assembly on Silica,” Langmuir 16, 2548 (2000).

  22. J.-H. Kim, M.M. Domach, R.D. Tilton, “Effect of Electrolytes on the Pyrene Solubilization Capacity of Dodecyl Sulfate Micelles,” Langmuir 16, 10037 (2000).

  23. S.B. Velegol, R.D. Tilton, “A Connection between Interfacial Self-Assembly and the Inhibition of Hexadecyltrimethylammonium Bromide Adsorption on Silica by Poly-L-lysine,” Langmuir 17, 219 (2001).

  24. M.L. Sun, R.D. Tilton “Coadsorption of Protein/Surfactant Complexes to the Air/Water Interface,” Colloids and Surfaces B: Biointerfaces 20, 281 (2001).

  25. A.D. Braem, D.C. Prieve, R.D. Tilton, “Electrostatically Tunable Coadsorption of Sodium Dodecylsulfate and Poly(Ethylene Oxide)-b-Poly(Propylene Oxide)-b-Poly(Ethylene Oxide) Triblock Copolymer to Silica,” Langmuir 17, 883 (2001).

  26. B.B. Luokkala, S. Garoff, R.D. Tilton, R.M. Suter, “Interfacial Structure and Rearrangement of Nonionic Surfactants near a Moving Contact Line,” Langmuir 17, 5917 (2001).

  27. V. Brisson, R.D. Tilton, “Self-Assembly and Two-Dimensional Patterning of Cell Arrays by Electrophoretic Deposition,” Biotechnology and Bioengineering 77, 290-295 (2002).

  28. S.B. Velegol, R.D. Tilton, “Specific Counterion Effects on the Competitive Co-Adsorption of Polyelectrolytes and Ionic Surfactants,” Journal of Colloid and Interface Science 249, 282-289 (2002).

  29. E.A.S. Doherty, K.D. Berglund, B.A. Buchholz, I.V. Kourkine, T.M. Przybycien, R.D. Tilton, A.E. Barron, “Critical Factors for High-Performance Physically Adsorbed (Dynamic) Polymeric Wall Coatings for Microchannel Electrophoresis of DNA,” Electrophoresis 23, 2766-2776 (2002).

  30. K.D. Berglund, A. Timko, T.M. Przybycien, R.D. Tilton, “Use of Nonionic Ethylene Oxide Surfactants as Phase Transfer Catalysts for Poly(Acrylic Acid) Adsorption to Silica against an Electrostatic Repulsion,” Progress in Colloid and Polymer Science 122, 56-66 (2003).

  31. K.D. Berglund, T.M. Przybycien, R.D. Tilton, “Coadsorption of Sodium Dodecylsulfate with Hydrophobically Modified Nonionic Cellulose Polymers I: Role of Polymer Hydrophobic Modification,” Langmuir 19, 2705-2713 (2003).

  32. K.D. Berglund, T.M. Przybycien, R.D. Tilton, “Coadsorption of Sodium Dodecylsulfate with Hydrophobically Modified Nonionic Cellulose Polymers II: Role of Surface Selectivity in Adsorption Hysteresis,” Langmuir 19, 2714-2721 (2003).

  33. A.D. Braem, S. Biggs, D.C. Prieve, R.D. Tilton, Control of Persistent Nonequilibrium Adsorbed Polymer Layer Structure by Transient Exposure to Surfactants,” Langmuir 19, 2736 (2003).

  34. S. Daly, T.M. Przybycien, R.D. Tilton, “Coverage Dependent Orientation of Lysozyme Adsorbed on Silica,” Langmuir 19, 3848 (2003).

  35. N. Kumar, K. Varanasi, R.D. Tilton, S. Garoff, “Surfactant Self-Assembly ahead of the Contact Line on a Hydrophobic Surface and its Implications for Wetting,” Langmuir 19, 5366 (2003).

  36. E. J. Choi, M.D. Foster, S. Daly, R. Tilton, T. Przybycien, C.F. Majkrzak, P. Witte, H. Menzel, "Effect of Flow on Human Serum Albumin Adsorption to Self-Assembled Monolayers of Varying Packing Density," Langmuir 19, 5464 (2003).

  37. K. D. Berglund, M. T. Truong, T.M. Przybycien, R. D. Tilton and L. M. Walker, “Rheology of Transient Networks Containing Hydrophobically Modified Cellulose, Anionic Surfactant and Colloidal Silica: Role of Selective Adsorption,” Rheol. Acta 43, 50 – 61 (2004)

  38. O.J. Rojas, P.M. Claesson, K.D. Berglund, and R.D. Tilton, “Coadsorption and Surface Forces for Selective Surfaces in Contact with Aqueous Mixtures of Oppositely Charged Surfactants and Low Charge Density Polyelectrolytes,” Langmuir, 20, 3221-3230 (2004).

  39. N. Kumar, S. Garoff, and R.D. Tilton, “Experimental Observations on the Scaling of Adsorption Isotherms for Nonionic Surfactants at a Hydrophobic Solid-Water Interface,” Langmuir 20, 4446-4451 (2004).

  40. N. Kumar and R.D. Tilton, “A Unified Model to Predict Self-Assembly of Nonionic Surfactants in Solution and Adsorption on Solid or Fluid Hydrophobic Surfaces: Effect of Molecular Structure,” Langmuir 20, 4452-4464 (2004).

  41. I.N. Nnebe, R.D. Tilton, and J.W. Schneider, “Direct Measurement of the Stability of Poly(ethylene glycol)-Poly(ethylenimine) Graft Films,” Journal of Colloid and Interface Science 276, 306-316 (2004).

  42. Y.Liu, S. Majetich, K. Matyjaszewski, R.D. Tilton, D. Sholl, and G.V. Lowry, “TCE Dechlorination Rates, Pathways, and Efficiency of Nanoscale Iron Particles with Different Properties,” Environmental Science and Technology, 39, 1338-1345 (2005).

  43. S. Daly, T.M. Przybycien, and R.D. Tilton, “Adsorption of poly(ethylene glycol) modified lysozyme to silica,” Langmuir 21, 1328-1337 (2005).

  44. H. Zhou, L.R. White and R.D. Tilton, “Lateral separation of colloids or cells by dielectrophoresis augmented by AC electroosmosis,” Journal of Colloid and Interface Science 285, 179-191 (2005).

  45. H. Zhou, M.A. Preston, R.D. Tilton, and L.R. White, “Calculation of the electric polarizability of a charged spherical dielectric particle by the theory of colloidal electrokinetics,” Journal of Colloid and Interface Science 285, 845-856 (2005).

  46. S.M. Daly, T.M. Przybycien and R.D. Tilton, “Adsorption of poly(ethylene glycol)-modified ribonuclease A to a poly(lactide-co-glycolide) surface,” Biotechnology and Bioengineering 90, 856-868 (2005).

  47. N. Saleh, T. Sarbu, K. Sirk, G.V. Lowry, K. Matyjaszewski, R.D. Tilton, “Oil-in-water emulsions stabilized by highly charged polyelectrolyte-grafted silica nanoparticles,” Langmuir 21, 9873-9878 (2005).

  48. H. Zhou, M.A. Preston, R.D. Tilton, L.R. White, “Calculation of the dynamic impedance of the double layer on a planar electrode by the theory of electrokinetics,” Journal of Colloid and Interface Science, 292, 277-289 (2005).

  49. N. Saleh, T. Phenrat, K. Sirk, B. Dufour, J. Ok, T. Sarbu, K. Matyjaszewski, R.D. Tilton, G.V. Lowry, “Adsorbed triblock copolymers deliver reactive iron nanoparticles to the oil/water interface,” Nano Letters 5, 2489-2494 (2005).

  50. H. Zhou, L.R. White, R.D. Tilton, “Microphase separation during binary electrophoretic deposition of particles with dissimilar polarizabilities,” Colloids and Surfaces A: Physicochemical and Engineering Aspects, 277, 119-130 (2006).

  51. M.A. Matos, L.R. White, R.D. Tilton, “Electroosmotically enhanced mass transfer through polyacrylamide gels,” Journal of Colloid and Interface Science, 300, 429-436 (2006)

  52. H. Zhou, R.D. Tilton, L.R. White, “The role of electrode impedance and electrode geometry in the design of microelectrode systems,” Journal of Colloid and Interface Science 297, 819-831 (2006)

  53. Long, T., Saleh, N., Tilton, R., Lowry, G. V., Veronisi, B. “Titanium dioxide (P25) produces reactive oxygen species in immortalized brain microglia (BV2): Implications for neurotoxicity” Environmental Science and Technology 40, 4346-4352 (2006)

  54. N. Saleh, K. Sirk, T. Phenrat, B. Dufour, K. Matyjaszewski, R.D. Tilton, and G.V. Lowry, “Surface modifications enhance nanoiron transport and DNAPL targeting in saturated porous media.” Environmental Engineering Science. 24, 45-57 (2007)

  55. T. Phenrat, N. Saleh, K. Sirk, R.D. Tilton, G.V. Lowry, “Aggregation and sedimentation of aqueous nanoscale zerovalent iron dispersions,” Environmental Science and Technology 41, 284-290 (2007).

  56. J.K. Lim, R.D. Tilton, A. Eggeman, S.A. Majetich, “Design and synthesis of plasmonic magnetic nanoparticles,” Journal of Magnetism and Magnetic Materials, 311, 78-83 (2007).

  57. A. Tulpar, R.D. Tilton, J.Y. Walz, “Synergistic effects of polymers and surfactants on depletion forces,” Langmuir 23, 4351-4357 (2007).

  58. S.M. Daly, T.M Przybycien, R.D. Tilton, “Aggregation of lysozyme and of poly(ethylene glycol)-modified lysozyme after adsorption to silica,” Colloids and Surfaces B: Biointerfaces 57, 81-88 (2007).

  59. A. Kusumo, L. Bombalski, Q. Lin, K. Matyjaszewski, J.W. Schneider, R.D. Tilton, “High capacity, charge-selective protein uptake by polyelectrolyte brushes,” Langmuir 23, 4448-4454 (2007).

  60. M. Matos, L.R. White, R.D. Tilton, "Enhanced mixing in polyacrylamide gels containing embedded silica nanoparticles as internal electroosmotic pumps,” Colloids and Surfaces B: Biointerfaces 61, 262-269 (2008).

  61. T. Phenrat, N. Saleh, K. Sirk, H.-J. Kim, R.D. Tilton, G.V. Lowry, “Stabilization of aqueous nanoscale zerovalent iron dispersions by anionic polyelectrolytes: adsorbed anionic polyelectrolyte layer properties and their effect on aggregation and sedimentation,” Journal of Nanoparticle Research, 10, 795-814 (2008).

  62. J.K. Lim, R.D. Tilton, A. Eggeman, F. Lanni, S.A. Majetich, “Synthesis and single particle optical detection of low polydispersity plasmonic-superparamagnetic nanoparticles,” Advanced Materials 20, 1721-1726 (2008).

  63. N. Saleh, H.-J. Kim, T. Phenrat, K. Matyjaszewski, R.D. Tilton, G.V. Lowry, “Ionic strength and composition affect the mobility of surface-modified Fe0 nanoparticles in water-saturated sand columns,” Environmental Science and Technology, 42, 3349-3355 (2008).

  64. A.L. Marcinkowski, S. Garoff, R.D. Tilton, J.M. Pilewski, T.E. Corcoran, “Post-deposition dispersion of aerosol medications using surfactant carriers,” Journal of Aerosol Medicine and Pulmonary Drug Delivery 21, 981-989 (2008).

  65. J.K. Lim, H. Zhou, R.D. Tilton, “Liposome Rupture and Contents Release over Coplanar Microelectrode Arrays,” Journal of Colloid and Interface Science 332, 113-121 (2009).

  66. S.S. Pai, R.D. Tilton, T.M. Przybycien, “Poly(ethylene glycol)-Modified Proteins: Implications for Poly(lactide-co-glycolide)-Based Microsphere Delivery,” AAPS Journal 11, 88-98(2009) DOI: 10.1208/s12248-009-9081-8.

  67. J.K. Lim, D.X. Tan, F. Lanni, R.D. Tilton, S.A. Majetich, “Optical imaging and magnetophoresis of nanorods,” Journal of Magnetism and Magnetic Materials 321, 1557-1562 (2009) DOI:10.1016/j.jmmm.2009.02.085.

  68. T. Phenrat, Y. Liu, R.D. Tilton, G.V. Lowry, “Adsorbed polyelectrolyte coatings decrease Fe0 nanoparticle reactivity with TCE in water: conceptual model and modes of action,” Environmental Science and Technology, in press (2009).

  69. K.M. Sirk, N.B. Saleh, T. Phenrat, H.-J. Kim, B. Dufour, J. Ok, P.L. Golas, K. Matyjaszewski, G.V. Lowry, R.D. Tilton, “Effect of Adsorbed Polyelectrolytes on Nanoscale Zero Valent Iron Particle Attachment to Soil Surface Models,” Environmental Science and Technology 43, 3803-3808 (2009). DOI: 10.1021/es803589t

  70. H.J. Kim, T. Phenrat, R.D. Tilton, G.V. Lowry “Fe0 nanoparticles remain mobile in porous media after aging due to slow desorption of polymeric surface modifiers,” Environmental Science and Technology 43, 3824-3830 (2009). DOI: 10.1021/es802978s.

  71. T. Phenrat, H.-J. Kim, F. Fagerlund, T. Illangaskare, R.D Tilton, G.V. Lowry, “Particle Size Distribution, Concentration, and Magnetic Attraction Affect Transport of Polymer-modified Fe0 Nanoparticles in Sand Columns,” Environmental Science and Technology 43, 5079-5085 (2009). DOI: 10.1021/es900171v

  72. J.K. Lim, S.A. Majetich, R.D. Tilton, “Stabilization of superparamagnetic iron oxide core – gold shell nanoparticles in high ionic strength media,” Langmuir Articles ASAP, July 31, 2009.

  73. S.S. Pai, R.D. Tilton, T.M. Przybycien, “Poly(ethylene glycol)-Modified Proteins: Implications for Poly(lactide-co-glycolide)-Based Microsphere Delivery,” The AAPS Journal 11, 88-98 (2009) DOI: 10.1208/s12248-009-9081-8

  74. J.K. Lim, D.X. Tan, F. Lanni, R.D. Tilton, S.A. Majetich, “Optical imaging and magnetophoresis of nanorods,” Journal of Magnetism and Magnetic Materials 321, 1557-1562 (2009) DOI:10.1016/j.jmmm.2009.02.085.

  75. T. Phenrat, Y. Liu, R.D. Tilton, G.V. Lowry, “Adsorbed polyelectrolyte coatings decrease Fe0 nanoparticle reactivity with TCE in water: conceptual model and mechanisms,” Environmental Science and Technology, 43, 1507-1514 (2009). DOI: 10.1021/es802187d

  76. K.M. Sirk, N.B. Saleh, T. Phenrat, H.-J. Kim, B. Dufour, J. Ok, P.L. Golas, K. Matyjaszewski, G.V. Lowry, R.D. Tilton, “Effect of Adsorbed Polyelectrolytes on Nanoscale Zero Valent Iron Particle Attachment to Soil Surface Models,” Environmental Science and Technology 43, 3803-3808 (2009). DOI: 10.1021/es803589t

  77. H.J. Kim, T. Phenrat, R.D. Tilton, G.V. Lowry “Fe0 nanoparticles remain mobile in porous media after aging due to slow desorption of polymeric surface modifiers,” Environmental Science and Technology 43, 3824-3830 (2009). DOI: 10.1021/es802978s

  78. T. Phenrat, H.-J. Kim, F. Fagerlund, T. Illangaskare, R.D Tilton, G.V. Lowry, “Particle Size Distribution, Concentration, and Magnetic Attraction Affect Transport of Polymer-modified Fe0 Nanoparticles in Sand Columns,” Environmental Science and Technology 43, 5079-5085 (2009). DOI: 10.1021/es900171v

  79. J.K. Lim, S.A. Majetich, R.D. Tilton, “Stabilization of superparamagnetic iron oxide core – gold shell nanoparticles in high ionic strength media,” Langmuir 25, 13384–13393 (2009). DOI: 10.1021/la9019734

  80. M. Lundin, E. Blomberg, R.D. Tilton, “Polymer dynamics in layer-by-layer assemblies of chitosan and heparin,” Langmuir 26, 3242-3251 (2010). DOI: 10.1021/la902968h


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