Gregory S. Smith

Gregory Smith

Position: Structure and Dynamics of Soft Matter Group Leader

Group: Structure and Dynamics of Soft Matter

Facility: High Flux Isotope Reactor

Contact: or (865) 241-1742

Dr. Smith is the group leader for the Structure and Dynamics of Soft Matter Group, in the Biology and Soft Matter Division, ORNL Neutron Sciences Directorate. Smith’s current research includes studies of the structure and interactions in biomimetic membranes and soft colloids. Smith received a Ph.D. in condensed matter physics from Iowa State University. He worked at Los Alamos National Laboratory as an instrument scientist and deputy group leader. Smith is a Fellow of the American Physical Society and the Neutron Scattering Society of America.


Ph.D. in Condensed Matter Physics, Iowa State University, 1985.
Advisor: Costa Stassis, Thesis Title: “Lattice Dynamics of Alpha Cerium”


Using neutron scattering techniques to study the structure and dynamics of soft condensed matter systems.

November 2011 - Present: Group Leader for the Structure and Dynamics of Soft Matter Group, in the Biology and Soft Matter Division, Neutron Sciences Directorate, Oak Ridge National Laboratory.
Group Leader for new group to focus on the study of soft condensed matter science. Responsible for user program on EQ-SANS, the Liquids Reflectometer (LR), and the Neutron Spin Echo (NSE). The group has members specializing in research using EQ-SANS, LR, NSE, GP-SANS, the backscattering instrument (BASIS), and scattering theory to span a range of structural and dynamical studies. Responsible for new strategies for strengthening ties and interactions with other soft matter researchers at ORNL, universities and industry. Duties include scientific, staff, instrument, and program development.

Sept. 2006 - November 2011: Group Leader for the Low Q Scattering Group at the Neutron Scattering Science Division, Oak Ridge National Laboratory.
Group leader for the Low-Q instruments at SNS and HFIR including the GP-SANS and Bio-SANS (matrixed) at HFIR and the EQ-SANS, Magnetism Reflectometer, Liquids Reflectometer and TOF-USANS at SNS. Responsibility for the commissioning of the SANS instruments, and the reflectometers and the design of the TOF-USANS. Also, responsible for developing research and user programs on these instruments.

July 2008 - February 2011: Neutron Scattering Sciences Division Office HFIR Operations Coordinator.
Acted as point-of-contact for the neutron scattering sciences operations at HFIR for the Neutron Scattering Sciences Division. Coordinated budget and staffing requests for HFIR groups. Helped institute work planning and organization. Provided updates on scientific activities to senior management and DOE.

Dec. 2007 - July 2008: Interim Deputy Division Director at the Neutron Scattering Science Division, Oak Ridge National Laboratory.
Worked with Interim Division Director with responsibilities for all NSSD operations and budgets including new instrument construction, scientific activities, safety, and technical support.

2002-2006: Group Leader for the Neutron Scattering User Program at the HFIR Center for Neutron Scattering, Oak Ridge National Laboratory.
· Wrote User Program Plan for HFIR/SNS user programs
· Developed HFIR CNS long range staffing plan to support user program and scientific program
· Developed and implemented a peer review proposal system
· Developed user program data base
· Implemented user access plans for HFIR researchers
· Directed development of a web-based proposal acquisition system
· Coordinated and assembled instrument data for instrument brochure

1995 – 1999; 2002: Acting Deputy Center Director at the Manuel Lujan Jr. Neutron Scattering Center.
· Shared oversight for the target/moderator operations at the Lujan Center
· Shared responsibility for the Lujan Center spectrometers and the scientific user program
· Acted as a backup for the Lujan Center Director in all aspects of group activities (~60 employees)
· Planned the future of the Lujan Center scientific activities and operations programs with the Lujan Center management team and scientists
· Conducted scientist and post doc performance appraisals, personnel actions, and participated in the LANSCE-12 salary management process
· Attended the LANSCE accelerator complex operations meetings
· Performed on-call for Lujan operations
· Held membership on division level committees (e.g. the LANSCE-3 Post Doc Committee, LANSCE-7 Hiring Committee, and the Group Leader Council)
· Regularly attended several other planning and organization committees (e.g. LANSCE Scheduling Committee, Radiation Safety Committee, Science Bases Stockpile Stewardship Team Leader Group).
· Prepared the 1998 LANSCE Field Work Proposal for the DOE Office of Basic Energy Sciences for a budget of $4 million

1997 (for ~ 6 months): Acting Center Director at the Manuel Lujan Jr. Neutron scattering Center.
· Oversaw the target/moderator operations at the Lujan Center
· Held responsibility for the Lujan Center spectrometers and the scientific user program
· During this period, oversaw all aspects of the group’s administration including personnel actions (hiring, etc.), budgeting and purchasing, and program planning with the management team and scientific staff
· Represented the Center at Division level meetings, standing committees (see above), internal and external program reviews, and external committees
· Assumed responsibility for all aspects of group safety in accordance with LANL policies and procedures
· Lead the initial Lujan Center startup for the May 1997 run cycle

1988-2002: Instrument Scientist at the Los Alamos Neutron Scattering Center, Los Alamos National Laboratory.
· Served as the instrument responsible scientist for the Surface Profile Analysis Reflectometer (SPEAR).
· Designed and constructed the SPEAR neutron reflectometer
· Developed and established a scientific program in surface science at the Lujan Center
· Continually upgrading SPEAR
· Working with outside scientists from all over the world using the reflectometer
· Developing new software for SPEAR
· Operating and equipping the Lujan Center clean room
· Studied the structure and correlations in soft matter materials using both neutron and synchrotron x-ray scattering

1985 - 1988: Post-doctoral research assistant in a joint collaboration between Exxon Research and Engineering Company Condensed Matter Laboratory and the University of Colorado Physics Department.
· Member of Safinya group at Exxon Research and Eng. Co.
· Studied the physics of liquid crystals using x-ray scattering techniques
· Performed experiments at beamlines VI and VII-2 at the Stanford Synchrotron Radiation Lab (Stanford University) and beamline X10-A at the National Synchrotron Light Source (Brookhaven National Lab)
· In-house research using a rotating anode x-ray machine
· Studied model membrane systems, which included membrane-forming biological lipids

Selected Publications

1. C. Do, W-R. Chen, K.L. Hong, and G.S. Smith, “Equilibrium structure of a triblock copolymer system revealed by mesoscale simulation and neutron scattering,” Phys. B- Cond. Matt., 430, 87(2013).

2. G. S. Smith, S-Y Jung, J.F. Browning, J. K. Keum, N. V. Lavrik, M. G. Alemseghed, and C. P. Collier, "Bilayer self-assembly on a hydrophilic, deterministically nanopatterned surface," Nano Research, 6(11), 784(2013).

3. B. Wu, Y. Liu, X. Li, E. Mamontov, A. I. Kolesnikov, S. O. Diallo, C. Do, L. Porcar, K.Hong, S. C. Smith, L. Liu, G.S. Smith, T. Egami, and W.-R. Chen, “Charge-Dependent Dynamics of a Polyelectrolyte Dendrimer and Its Correlation with Invasive Water,” JACS, 135(13), 5111(2013).

4. B.Wu, W.R. Chen, T. Egami, X. Li, Y. Liu, Y.M. Wang, C. Do, L. Porcar, K.L. Hong, L. Liu, G.S. Smith, and S.C. Smith, “Molecular dynamics and neutron scattering study of the dependence of polyelectrolyte dendrimer conformation on counterion behavior,” J. Chem. Phys., 137(6), 064902(2012).

5. E.W. Huang, Y. Liu, Y. Ren, L. Porcar, J.J. Kai, P.K. Liaw, G.S. Smith, W.-R. Chen, “Evolution of microstructure in a nickel-based superalloy as a function of ageing time,” Phil. Mag. Lett., 91(7), 483(2011).

6. Y. Liu, C.Y. Chen, H.L. Chen, K.L. Hong, C.Y. Shew, X. Li, L. Liu, Y.B. Melnichenko, G.S. Smith, K.W. Herwig, L. Porcar, and W.R. Chen, “Electrostatic Swelling and Conformational Variation Observed in High-Generation Polyelectrolyte Dendrimers” J. Phys. Chem. Lett., 1(13), 2020 (2010).

7. T. Li, K. Hong, L. Porcar, R. Verduzco, P. Butler, G.S. Smith, Y. Liu, W.-R.Chen, “Assess the Intramolecular Cavity of a PAMAM Dendrimer in Aqueous Solution by Small-Angle Neutron Scattering,” Macromolecules, 41, 8916(2008).

8. G.S Smith, T.L. Kuhl, W.A. Hamilton, D.J. Mulder, and S. Satija, “Structure of Confined Polymer Thin Films Subject to Shear,” Physica B- Cond. Matt., 385 (Pt. 1), 700(2006).

9. G. S. Smith, and C. F. Majkrzak, “Neutron Reflectometry,” in the International Tables for Crystallography, Volume C: Mathematical, Physical and Chemical Tables - third edition (2006 first online edition) , Editors: E. Prince and A. J. C. Wilson, 126-146(2004).

10. H. Yim, M.S. Kent, D.L. Huber, S. Satija, J. Majewski, G.S. Smith, “Conformation of end-tethered PNIPAM chains in water and in acetone by neutron reflectivity,” Macromolecules 36 (14), 5244 (2003).

Awards, Honors and Memberships

· Elected Fellow of the Neutron Scattering Society of America, 2012
· Neutron Scattering Society of America Outstanding Service Award, 2010
· Chair/Organizer Soft Matter Sessions, American Conference on Neutron Scattering 2010
· Co-Chair of International Conference on Neutron Scattering, 2009.
· Elected Membership Secretary of the Neutron Scattering Society of America, 2003-2005, 2006-2008
· Elected to Fellowship in the American Physical Society, 2001
· DOE Defense Programs Award of Excellence for Significant Contributions to the Stockpile Stewardship Program, 2001
· First Recipient of the LANSCE Director’s Award for Scientific Excellence, 2000
· Elected member in the Small Angle Neutron Scattering Special Interest Group of the American Crystallographic Association 1993-1996