Michael Dimitriou
Michael D. Dimitriou, Ph.D.
Senior Associate
Polymer Science & Materials Chemistry
  • Bowie

Dr. Dimitriou’s area of expertise is polymer physics and synthesis, focusing on the physical characterization of novel polymer systems and their interfacial interactions. He specializes in defining the structure-property relationships of polymer systems including block copolymers, polymeric surfactants, polymer blends, polymer brushes, confined films, hydrogels, and hierarchical structures. Dr. Dimitriou has experience in utilizing material design and processing conditions to yield the physical properties of choice for polymer systems used in semiconductor processing, lithography and nanopatterning, organic photovoltaic devices, and coatings designed with non-toxic, bio-permissible, protective antifouling properties for maritime use, water filtration membranes, implantable medical devices, and drug delivery.

Dr. Dimitriou has extensive experience with a wide variety of surface characterization techniques including X-ray photoelectron spectroscopy (XPS), near edge X-ray absorption fine structure (NEXAFS) spectroscopy, atomic force microscopy (AFM), scanning electron microscopy (SEM), and surface energy measurements, as well as polymer thin film characterization using dynamic secondary ion mass spectrometry (dSIMS), X-ray and neutron reflectivity, and ellipsometry. Additionally Dr. Dimitriou is experienced in controlled polymer synthesis techniques, macromolecular characterization [gel permeation chromatography (GPC), dynamic light scattering (DLS), and nuclear magnetic resonance (NMR)], and methods of polymer thin film deposition including spin coating, spray coating, doctor blade, vapor deposition, and Langmuir-Blodgett deposition.

Prior to joining Exponent, Dr. Dimitriou worked at the National Institute of Standards and Technology’s Center for Neutron Research, where he utilized neutron scattering to investigate water uptake in polyelectrolyte brushes (organic sensors) and protective coatings, polymer interdiffusion in confined thin films, and antibody interactions at a membrane interface. There he became versed with neutron activation of materials and safe handling protocols. Before working at NIST, Dr. Dimitriou’s Ph.D. research focused on incorporating fluorocarbons into block copolymers to control surface properties. With funding from the Office of Naval Research he used this strategy to engineer two systems, one to serve as an environmentally friendly anti-biofouling coating and another, a lithographic template for patterning.

CREDENTIALS & PROFESSIONAL HONORS

  • Ph.D., Materials Engineering, University of California, Santa Barbara, 2011
  • B.S., Materials Science and Engineering, Massachusetts Institute of Technology (MIT), 2006
  • National Research Council Postdoctoral Fellowship

    Materials Research Laboratory Diversity Fellow

    CPS Technologies Fellowship

LANGUAGES

  • Greek

Publications

Killops KL, Gupta N, Dimitriou MD, Lynd NA, Jung H, Tran H, Bang J, Campos LM. Nanopatterning biomolecules by block copolymer self-assembly. ACS Macro Letters 2012; 1(6):758–763.

Dimitriou MD, Martinelli E, Fischer DA, Galli G, Kramer EJ. Surface organization of a perfluorocarbon-functionalized polystyrene homopolymer. Macromolecules 2012; 45(10):4295–4302.

Cho Y, Sundaram HS, Finlay JA, Dimitriou MD, Callow ME, Callow JA, Kramer EJ, Ober CK. Reconstruction of surfaces from mixed hydrocarbon and PEG components in water: Responsive surfaces aid fouling release. Biomacromolecules 2012; 13(6):1864–1874.

Dimitriou MD, Sundaram HS, Cho Y, Paik MY, Kondo M, Schmidt K, Fischer DA, Ober CK, Kramer EJ. Amphiphilic block copolymer surface composition: Effects of spin coating versus spray coating. Polymer 2012; 53(6):1321–1327.

Dimitriou MD, Zhou Z, Yoo HS, Killops KL, Finlay JM, Cone G, Sundaram HS, Lynd NA, Barteau KP, Campos LM, Fischer DA, Callow ME, Callow JA, Ober CK, Hawker CJ, Kramer EJ. A general approach to controlling the surface composition of poly(ethylene oxide)-based block copolymers for antifouling coatings. Langmuir 2011, 27 (22):13762–13772.

Sundaram HS, Cho Y, Dimitriou MD, Finlay JA, Cone G, Williams S, Handlin D, Gatto J, Callow ME, Callow JA, Kramer EJ, Ober CK. Fluorinated amphiphilic polymers and their blends for fouling-release applications: The benefits of a triblock copolymer surface. ACS Applied Materials Interfaces 2011; 3(9):3366–3374.

Sundaram HS, Cho Y, Dimitriou MD, Weinman CJ, Finlay JA, Cone G, Callow ME, Callow JA, Kramer EJ, Ober CK. Fluorine-free mixed amphiphilic polymers based on PDMS and PEG side chains for fouling release applications. Biofouling 2011; 27 (6001):589–602.

Jang SG, Khan A, Dimitriou MD, Kim BJ, Lynd NA, Kramer EJ, Hawker CJ. Synthesis of thermally stable Au-core/Pt-shell nanoparticles and their segregation behavior in diblock copolymer mixtures. Soft Matter 2011; 7 (13):6255–6263.

Choi SQ, Jang SG, Pascall AJ, Dimitriou MD, Kang T, Hawker CJ, Squires TM. Synthesis of multifunctional micrometer-sized particles with magnetic, amphiphilic, and anisotropic properties. Advanced Materials 2011; 23(20):2348–2352.

Cho Y, Sundaram HS, Weinman CJ, Paik MY, Dimitriou MD, Finlay JA, Callow ME, Callow JA, Kramer EJ, Ober CK. Triblock copolymers with grafted fluorine-free, amphiphilic, non-ionic side chains for antifouling and fouling-release applications. Macromolecules 2011; 44(12):4783–4792.

Treat ND, Campos LM, Dimitriou MD, Ma B, Chabinyc ML, Hawker CJ. Nanostructured hybrid solar cells: Dependence of the open circuit voltage on the interface composition. Advanced Materials 2010; 22(44):4982–4986.

Park D, Weinman CJ, Finlay JA, Fletcher BR, Paik MY, Sundaram HS, Dimitriou MD, Sohn KE, Callow ME, Callow JE, Handlin DL, Willis CL, Fischer DA, Kramer EJ, Ober CK. Amphiphilic Surface active triblock copolymers with mixed hydrophobic and hydrophilic side chains for tunes marine fouling-release properties. Langmuir 2010; 26(12):9772–9781.

Tang CB, Hur SM, Stahl BC, Sivanandan K, Dimitriou MD, Pressly E, Fredrickson GH, Kramer EJ, Hawker CJ. Thin film morphology of block copolymer blends with tunable supramolecular interactions for lithographic applications. Macromolecules 2010; 43(6):2880–2889.

Gupta N, Lin BF, Campos LM, Dimitriou MD, Hikita ST, Treat TD, Tirrell MV, Clegg DO, Kramer EJ, Hawker CJ. A versatile approach to high-throughput microarrays using thiolene chemistry. Nature Chemistry 2010; 2(2):138–145.

Campos LM, Truong TT, Shim DE, Dimitriou MD, Shir D, Meinel I, Gerbec JA, Hahn TH, Rogers JA, Hawker CJ. Applications of photocurable PMMS Thiol-ene stamps in soft lithography. Chemistry of Materials 2009; 21(21):5319–5326.

Weinman CJ, Finlay JA, Park D, Paik MY, Krishnan S, Sundaram HS, Dimitriou MD, Sohn KE, Callow ME, Callow JA, Handlin DL, Willis CL, Kramer EJ, Ober CK. ABC triblock surface active block copolymer with grafted ethoxylated fluoroalkyl amphiphilic side chains for marine antifouling/fouling-release applications. Langmuir 2009; 25(20):12266–12274.

Sohn KE, Dimitriou MD, Genzer J, Fischer DA, Hawker CJ, Kramer EJ. Depth profiling the near surface of polymer films using NEXAFS spectroscopy. Langmuir 2009; 25(11):6341–6348.

Presentations

Dimitriou MD, Galvin CJ, Satija SK, Genzer J. Measuring graft stability in a tethered polyelectrolyte film by X-ray and neutron reflectivity. Poster presentation, American Physical Society National Meeting, Baltimore, MD, 2013.

Akgun BA, Dimitriou MD, Satija SK. How does Tg reduction affect the chain mobility in confined polymer films? Poster presentation, American Physical Society National Meeting, Baltimore, MD, 2013.

Dimitriou MD, Akgun BA, Satija SK. The effect of Tg reduction on chain mobility in confined polystyrene films. Poster presentation, NIST Sigma Xi, Gaithersburg, MD, 2013.

Akgun BA, Dimitriou MD, Satija SK. How does Tg reduction affect chain mobility at interfaces? Poster presentation, American Conference on Neutron Scattering, Washington, DC, 2012.

Dimitriou MD, Zhou Z, Yoo HS, Killops KL, Finlay JM, Cone G, Sundaram HS, Lynd NA, Barteau KP, Campos LM, Fischer DA, Callow ME, Callow JA, Ober CK, Hawker CJ, Kramer EJ. Anti-biofouling performance of amphiphilic block copolymer coatings. Poster presentation, Gordon Research Conference, Ventura, CA, 2012.

Dimitriou MD, Hawker CJ, Kramer EJ. Utilizing perfluorocarbons to control surface composition of a polystyrene-b-poly(2-vinylpyridine) block copolymer. Oral presentation American Physical Society National Meeting, Dallas, TX, 2011.

Dimitriou MD, Ober CK, Hawker CJ, Kramer EJ. Functionalized block copolymers for anti-biofouling applications. Invited talk, UCSB Materials Research Outreach Program, Santa Barbara, CA, 2011.

Dimitriou MD, Hawker CJ, Kramer EJ. Surface composition and morphology of fluorine end-functionalized poly(2-vinylpyridine) in a poly(2-vinypyridine) homopolymer. Poster presentation, American Physical Society National Meeting, Portland, OR, 2010.

Dimitriou MD, Ober CK, Kramer EJ. Surface analytical methods with depth sensitivity for anti-fouling coatings. Poster presentation, ONR Coatings/Biofouling Review, Portland, OR, 2010.

Dimitriou MD, Hawker CJ, Kramer EJ. Surface segregation of end-functionalized homopolymers in a homopolymer matrix. Poster presentation, American Physical Society National Meeting, Pittsburgh, PA, 2009.

Prior Experience

National Research Council Postdoctoral Fellow, NIST Center for Neutron Research, 2011–2013

Professional Affiliations

American Physical Society

American Chemical Society

NIST Chapter of Sigma Xi

Massachusetts Institute of Technology Educational Council

CREDENTIALS & PROFESSIONAL HONORS

  • Ph.D., Materials Engineering, University of California, Santa Barbara, 2011
  • B.S., Materials Science and Engineering, Massachusetts Institute of Technology (MIT), 2006
  • National Research Council Postdoctoral Fellowship

    Materials Research Laboratory Diversity Fellow

    CPS Technologies Fellowship

LANGUAGES

  • Greek