VanWinkleDavid.jpg (4390 bytes) David H. Van Winkle

Chairman of the Physics Department
Associate Professor of Physics
Department of Physics and Center for Materials Research and Technology
Florida State University
Tallahassee, Florida 32306-4350
Phone: (850) 644-6019
Fax: (850) 644-6504
E-mail: rip@phy.fsu.edu

EDUCATION

Colby College, Waterville Maine, BA, 1978
University of Colorado, Boulder, MS, 1980
University of Colorado, Boulder, Ph.D. 1984

RESEARCH AND PROFESSIONAL EXPERIENCE

May 03 - present Chair and Professor, Department of Physics, Florida State University
Aug 99 - May 03 University Associate Chair and Professor, Department of Physics, Florida State University
May 95 - Jul 99: Associate Chair and Associate Professor, Department of Physics, Florida State University
Aug 91 - May 95: Associate Professor, Department of Physics, Florida State University.
Aug 86 - Aug 91: Assistant Professor, Department of Physics, Florida State University.
Sept 84 - Jul 86: Post Doctoral Member of Technical Staff, AT&T Bell Laboratories, C. A. Murray, sponsor.
Feb 79 - Sept 84: Graduate Research Assistant, Department of Physics, University of Colorado. Thesis: "Direct Measurement of Orientation Correlations in a Two Dimensional Liquid Crystal System" (N.A. Clark, Prof.)
Sept 78 - Dec 79: Graduate Teaching Assistant, Department of Physics, University of Colorado.
May 1978: B.A. in Physics: Summa cum Laude, Honors in Major, Phi Beta Kappa.

Awards and Honors:

Florida State University, University Teaching Award 1994-1995
State of Florida, Board of Regents Teaching Incentive Program award 1994.
American Society for Engineering Education - Office of Naval Research Summer Faculty Fellow at the Naval Coastal Systems Center, Summer 1993.
American Society for Engineering Education - Office of Naval Research Summer Faculty Fellow at the Naval Coastal Systems Center, Summer 1989
University of Colorado Graduate Fellowship 1983-1984

Professional Society Memberships:

American Physical Society
American Association of Physics Teachers
Materials Research Society
International Liquid Crystal Society

REFEREED Papers

24. "Templated pores in hydrogels for improved size selectivity in gel permeation chromatography", R. L. Rill, D. H. Van Winkle, and B. R. Locke, Anal. Chem. 70, 2433-2438 (1998). Aqualifies for publication without change as an Accelerated Article in the Journal A model to identify the possible improvements in gel permeation chromatography when pores are templated into the gel during polymerization.

23. "Optimizing Capillary Gel Electrophoresis Separations of Oligonucleotides in Liquid Crystalline Pluronic F127", Y. Liu, B. R. Locke, D. H. Van Winkle, and R. L. Rill, J. Chromatog. A in press (nine journal pages). A report of experimental details of the oligonucleotide (single stranded pieces of double stranded DNA) separations possible using the new material, Pluronic F127, as the supporting medium.

22. "Pluronic copolymer liquid crystals: unique replaceable media for capillary gel electrophoresis", R. L. Rill, Y. Liu, D. H. Van Winkle, and B. R. Locke, J. Chromatog. A, in press (nine journal pages). An overview of the possible uses of Pluronics for separations of many types of macromolecules.

21. "Electrophoresis in lyotropic polymer liquid crystals", R. L. Rill, B. R. Locke, Y. Liu, and D. H. Van Winkle, Proc. Natl. Acad. Sci. 95, 1534-1539 (1998). Our first report of use of a triblock copolymer for electrophoretic separations, which offers many technical and fundamental advantages for separations of macromolecules.

20. "Nematic bubbles in freely suspended liquid crystal films", D. H. Van Winkle, F. Kettwig and M. Nechanicky, Molecular Crystals and Liquid Crystals 304, 471-476 (1997). This summarizes light microscopy observations of films as the temperature was varied, made by two undergraduates working sequentially in my laboratory, over a three year period.

19. "Fringe visibility of multimode laser light scattered through turbid water", N. L. Swanson, Chong Pham and D. H. Van Winkle, Applied Optics 36, 9509-9514 (1997). A theoretical and experimental discussion of how the statistical properties of laser modes can lead to a change in fringe visibility.

18. "Forward scattered light: spectral broadening and temporal coherence", N. L. Swanson and D. H. Van Winkle, Phys. Rev. A 55, 4501-4510 (1997). The main results of Nancy Swanson=s Ph.D. thesis are discussed, including observation of a here-to-fore unexpected broadening of the laser line-width scattered through solutions of small particles.

17. "Metastable structures of cholesteric liquid crystals with negative diamagnetic anisotropy in magnetic fields", A. Chatterjee and D. H. Van Winkle, Phys. Rev. E 55, 4360-4366 (1997). This portion of Arunava Chatterjee's Ph.D. thesis discusses a computer simulation which duplicates liquid crystalline structures observed only in the presence of relatively high magnetic fields.

16. "Magnetic field alignment of cholesteric liquid crystalline DNA", D. H. Van Winkle, A Chatterjee, R. Link, and R. L. Rill, Phys. Rev. E 55, 4354-4359 (1997). This paper reports a variety of structures observed when liquid crystalline DNA samples are reoriented in magnetic fields, including the one which is the subject of paper number 17 (above).

15. "Protein electrophoresis in polyacrylamide gels with templated channels", R. Rill, B. Locke, Y. Liu, J. Dharia, and D. Van Winkle, Electrophoresis 17, 1304-1312 (1996). This is the first paper resulting from our successful interdisciplinary collaboration on creating new types of gels for electrophoretic separation of biologically important macromolecules (like DNA and proteins).

14. "Surface tension gradient induced flow in freely suspended liquid crystalline films", M. Godfrey and D. H. Van Winkle, Phys. Rev. E 54, 3752-3764 (1996). This paper presents the major results of Maxwell Godfrey=s Ph.D. thesis discussing flow in a two dimensional system, induced by temperature differences.

13. "Monte Carlo simulation of the unwinding of cholesteric twist", A. Chatterjee and D. H. Van Winkle, Phys. Rev. E 49, 1450-1457 (1994). This portion of Arunava Chatterjee=s Ph.D. thesis represents the first application of Monte Carlo techniques to simulate the twist of a chiral nematic liquid crystal and develops an understanding of the formation of defects in that system.

12. "Terraces in the cholesteric phase of DNA liquid crystals", D. H. Van Winkle, M. W. Davidson and R. L. Rill, J. Chem. Phys. 97, 5641-5646 (1992). This is a report of the experimental observation of unwinding of a twisted nematic liquid crystal in a concentration gradient.

11. "Ordered phases in concentrated DNA solutions", R. L. Rill, T. E. Strzelecka, M. W. Davidson and D. H. Van Winkle, Physica A 176, 87-116 (1991). This is a comprehensive summary of phase studies of DNA including nuclear magnetic resonance measurements by Strzelecka in Rill=s lab and light microscope and diffraction measurements made in Van Winkle=s lab.

10. "Digital Imaging Studies of Submicron Colloidal Spheres Confined into a Single Layer between Two Glass Plates: Two Dimensional Melting", C. A. Murray, D. H. Van Winkle, and R. A. Wenk, Phase Transitions 21, 93-126 (1990).

9. "The Cholesteric Helical Pitch of Near Persistence Length DNA", M.W. Davidson, W.X. Chen, D.H. Van Winkle and R.L. Rill, Macromolecules 23, 4140 (1990).

8. "Electrohydrodynamic Flow in Thick Liquid Crystal Cells", D. H. Van Winkle, J. Gurung, and R. Biggers, Materials Research Society Symposium Proceedings 177, "Macromolecular Liquids", Eds. C. R. Safinya, S. A. Safran and P. A. Pincus (Materials Research Society, Pittsburgh, 1990) p. 311-316.

7. "Raman Scattering from Freely Suspended Liquid Crystal Films", D.H. Van Winkle, S.B. Dierker and N.A. Clark, J. Chem. Phys. 91, 5212-5217 (1989).

6. "Layering in Colloidal Fluids Near a Smooth Repulsive Wall" D.H. Van Winkle and C.A. Murray, J. Chem. Phys. 89, 3885-3891 (1988).

5. "Direct Measurement of Orientation Correlations in a Two Dimensional Liquid Crystal System", D.H. Van Winkle and N.A. Clark, Phys. Rev. A. 38, 1573-1589 (1988).

4. "The Two Dimensional Phase Transition in a Single Layer of Colloidal Spheres", C.A. Murray and D.H. Van Winkle, Phys. Rev. Lett. 58, 1200-1203 (1987).

3. "Layering Transitions in Colloidal Crystals as Observed by Diffraction and Direct Lattice Imaging", D.H. Van Winkle and C.A. Murray, Phys. Rev. A 34, 562 (1986).

2. "Direct Measurement of Orientation Correlations: Observation of the Landau-Peierls Divergence in a Freely Suspended Tilted Smectic Film", D.H. Van Winkle and N.A. Clark, Phys. Rev. Lett. 53, 1157 (1984).

1. "Freely Suspended Strands of Tilted Columnar Liquid Crystal Phases: One Dimensional Nematics with Orientational Jumps", D.H. Van Winkle and N.A. Clark, Phys. Rev. Lett. 48, 1407 (1982).

NON-REFFERED Conference Papers

3. "Field alignment of rod-like polymer liquid crystals", T. P. Szabo, D. H. Van Winkle, J. Dharia, Y. J. Liu, R. L. Rill and B. R. Locke, in Physical Phenomena at High Magnetic Fields - II, Eds. Z. Fisk, L. Gorkov, D. Meltzer, and R. Schrieffer, (World Scientific, New Jersey, 1996), pp 743-746. This reports novel textures observed in DNA liquid crystals aligned in magnetic fields and discusses attempts to align DNA and Xanthan fragments in electric and magnetic fields.

2. "Temporal coherence loss due to dynamic scattering of laser light", N. Swanson and D. H. Van Winkle, IEEE Oceans 3, 171-175, (1993). This represents our first reports of an unexpected change in the properties of laser light scattered through a solution of small particles.

1. "Alignment of Lyotropic Liquid Crystalline Phases of DNA Using High Magnetic Fields", D. H. Van Winkle, M. W. Davidson and R. L. Rill, in "Physical Phenomena at High Magnetic Fields", Eds. E. Manousakis, P. Schlottman, P. Kumar, K. Bedell and F. Mueller (Addison Wesley, 1992) p. 469-477. This represents our first report of many of the novel textures observed in DNA liquid crystalline phases aligned in relatively high magnetic fields.

PUBLISHED ABSTRACTS

36. "Dynamics of sodium dodecyl sulfate micelles in polyacrylamide gels", A. Reyna, Y. J. Liu, and D. H. Van Winkle, Bull. Amer. Phys. Soc. 43, 959 (1998).

35. "Electrophoresis through triblock co-polymer micelles", D. H. Van Winkle, R. L. Rill, Y.-J. Liu, and B. R. Locke, Bull. Amer. Phys. Soc. 43, 913 (1998).

34. "Electrophoresis in lyotropic polymer liquid crystals", D. H. Van Winkle, R. L. Rill, Y.-J. Liu, and B. R. Locke, Biophysical Journal 74, A295 (1998).

33. "Pluronic co-polymer liquid crystals: versatile new media for capillary electrophoresis", R. L. Rill, Y.-J. Liu, B. R. Locke, and D. Van Winkle, at the Eighth Annual Frederick Conference on Capillary Electrophoresis, 20-22 Oct. 1997 at Hood College.

32. "Gel electrophoresis of nucleic acids in liquid crystal forming pluronic7 F127 solutions", Y.-J. Liu, R. L. Rill, B. R. Locke, and D. Van Winkle, at the Eighth Annual Frederick Conference on Capillary Electrophoresis, 20-22 Oct. 1997 at Hood College.

31. "Sodium dodecyl sulfate micelles in polyacrylamide gels", D. H. Van Winkle, F. Kettwig, R. L. Rill, Y. Liu, and B. R. Locke, Bull. Amer. Phys. Soc. 42, 249 (1997).

30. "Electrophoresis gels modified by templates during polymerization", D. H. Van Winkle, T. Szabo, R. L. Rill, Y.-J. Liu and B. R. Locke, Bull. Amer. Phys. Soc. 41, 545 (1996).

29. "Xray fiber diffraction studies of tobacco mosaic virus", A. Kaufman, A. Chatterjee, D. L. D. Caspar and D. H. Van Winkle, Bulletin of the American Physical Society 41, 658 (1996).

28. "Electrophoretic transport of proteins through templated gels", Y.-J. Liu, R. Rill, D. H. Van Winkle, T. Szabo, and B. R. Locke, Bull. Amer. Phys. Soc. (given at Southeastern section meeting 9-11 November 1995).

27. "Encouraging Student Interaction in Introductory University Physics Recitation", David H. Van Winkle, announcer: American Association of Physics Teachers, 24, 83 (1994).

26. "Video and photomicroscopy investigation of dynamics in circular free standing liquid crystalline films", M. Nechanicky and D. H. Van Winkle, Bull. Amer. Phys. Soc. 39, ??? (1994).

25. "Defects in Magnetically Aligned Cholesteric DNA", A. Chatterjee and D. H. Van Winkle, Bull. Amer. Phys. Soc. 39, 741 (1994).

24. "Effects of Scattering on Temporal Coherence Properties of Laser Light", N. L. Swanson and D. H. Van Winkle, Bull. Amer. Phys. Soc. 39, 319 (1994).

23. "Rejection of White Light Noise using an Interferometer", D. H. Van Winkle and N. L. Swanson, Bull. Amer. Phys. Soc. 39, 382 (1994).

22. "Center of Mass Order in Cholesteric Liquid Crystals", A. Chatterjee and D. H. Van Winkle, Materials Research Society Fall (1993), O6.10, p 392.

21. "Enhanced Flow in Freely Suspended Smectic Films in Low Vacuum", M.I. Godfrey and D. Van Winkle, 22nd Annual Symposium on Applied Vacuum Science and Technology, (1993).

20. "Novel Thermocapillary Flow in Freely Suspended Smectic Liquid Crystal Films", M.I. Godfrey and D. Van Winkle, Bull. Amer. Phys. Soc. 37, 1758 (1992).

19. "Director Flow Coupling in Freely Suspended Smectic Liquid Crystal Films", M. Godfrey and D. H. Van Winkle, Bull. Amer. Phys. Soc. 37, 488 (1992).

18. "Domain Wall Formation in Cholesteric Liquid Crystal DNA", A. Chatterjee and D. H. Van Winkle, Bull. Amer. Phys. Soc. 37, 349 (1992).

17. "Preparation of Multiple Liquid Crystalline Phases of DNA in High Centrifugal Fields", J. Gurung, M. W. Davidson, K. Merchant, R. L. Rill and D. H. Van Winkle, Bull. Amer. Phys. Soc. 36, 1997 (1991).

16. "The Cholesteric to Hexagonal Phase Transition in DNA Liquid Crystals", D. H. Van Winkle, M. W. Davidson, and R. L. Rill, Bull. Amer. Phys. Soc. 36, 1997 (1991).

15. "Williams Domains in Thick Liquid Crystal Cells", B. Adhikari, J. Gurung and D. H. Van Winkle, Bull. Amer. Phys. Soc. 36, 1995 (1991).

14. "Optical Studies of Electrohydrodynamic Flow in Thick Liquid Crystal Cells", J. Gurung and D. H. Van Winkle, Bull. Amer. Phys. Soc. 35, 1226 (1990).

13. "Structural Analysis of Cholesteric Liquid Crystalline DNA", M. W. Davidson, R. L. Rill, D. H. Van Winkle, W. X. Chen and H. Aldrich, J. Biomol. Struct. and Dyn., in press.

12. "Monodisperse DNA Strands: A Novel Polymer Liquid Crystal", D. H. Van Winkle, Bull. Amer. Phys. Soc. 34, 782 (1989).

11. "Coupling of Convective Flow and the Orientation Field in a Freely Suspended Liquid Crystal Film", Maxwell Godfrey and D. H. Van Winkle, Bull. Amer. Phys. Soc. 34, 496 (1989).

10. "Optical Diffraction Measurements of Long Range Order in DNA Liquid Crystals", D.H. Van Winkle, M.W. Davidson, and R.L. Rill, Bull. Amer. Phys. Soc. 33, 749 (1988).

9. "Freeze-Fracture-Etch Imaging of Cholesteric Liquid Crystalline DNA Phases", M. W. Davidson, R. L. Rill, D. H. Van Winkle, F. Livolant, and H. Aldrich, Bull. Amer. Phys. Soc. 33, 749 (1988).

8. "Ordering Near a Planar Boundary in Colloidal Fluids and Crystals", D.H. Van Winkle and C.A. Murray, Bull. Amer. Phys. Soc. 31, 692 (1986).

7. "Two Dimensional Melting in Colloidal Crystals", C.A. Murray and D.H. Van Winkle, Bull. Amer. Phys. Soc. 31, 281 (1986).

6. "Nonlinear Effects in the Scattering from a Landau-Peierls System", D.H. Van Winkle and N.A. Clark, Bull. Amer. Phys. Soc. 30, 380 (1985).

5. "Light Diffraction from Two and Three Dimensional Colloidal Crystals", D.H. Van Winkle and C.A. Murray, Bull. Amer. Phys. Soc. 30, 380 (1985).

4. "Point Disclinations in the Two Dimensional Nematic Orientation Field of a Smectic-C Film", D.H. Van Winkle and N.A. Clark, Bull. Amer. Phys. Soc. 30, 379 (1985).

3. "The Transition Between 2D-3D in Colloidal Crystals, Observed by Direct Lattice Imaging", C.A. Murray, D.H. Van Winkle, C.C. Grimes, Bull. Amer. Phys. Soc. 30, 238 (1985).

2. "Cross Correlation Intensity Fluctuation Spectroscopy (CCIFS) of Orientation Correlations in a Two Dimensional (2d) Nematic", D.H. Van Winkle and N.A. Clark, Bull. Amer. Phys. Soc. 28, 333 (1983).

1. "Polarized Reflectance Microscopy Studies of Orientation Fluctuations in Freely Suspended Smectic-C Liquid Crystal Films", D.H. Van Winkle and N.A. Clark, Bull. Amer. Phys. Soc. 26, 275 (1981).

RECENT PRESENTATIONS AT NATIONAL AND INTERNATIONAL MEETINGS

(* invited)

30. "Electrophoresis through triblock co-polymer micelles", D. H. Van Winkle, R. L. Rill, Y.-J. Liu, and B. R. Locke, at the March meeting of the American Physical Society, 20 March 1998.

29. "Electrophoresis in lyotropic polymer liquid crystals", D. H. Van Winkle, R. L. Rill, Y.-J. Liu, and B. R. Locke, at the Biophysical Society meeting 22-26 Feb. 1998.

28. "SDS micelles in polyacrylamide gels", D. H. Van Winkle, A. Reyna, F. Kettwig, R. L. Rill, Y-J. Liu, and B. R. Locke, at the Gordon Research Conference on Liquid Crystals, Tilton, New Hampshire, 8-13 June 1997.

27. "Sodium dodecyl sulfate micelles in polyacrylamide gels", D. H. Van Winkle, F. Kettwig, R. L. Rill, Y. Liu, and B. R. Locke, at the March meeting of the American Physical Society, 18 March 1997.

* 26. "Nematic bubbles in freely suspended liquid crystal films", D. H. Van Winkle, F. Kettwig and M. Nechanicky, at the 16'th International Liquid Crystal Conference held at the Liquid Crystal Institute, Kent State University, Kent OH, 24-28 June 1996. Contributed abstract was one of 80 out of 800 invited for oral presentation.

25. "Electrophoresis gels modified by templates during polymerization", D. H. Van Winkle, T. Szabo, R. L. Rill, Y.-J. Liu and B. R. Locke, at the March Meeting of the American Physical Society, 18-22 March 1996.

24. "Xray fiber diffraction studies of tobacco mosaic virus", A. Kaufman, A. Chatterjee, D. L. D. Caspar and D. H. Van Winkle, at the March Meeting of the American Physical Society, 18-22 March 1996.

23. "Rejection of White Light Noise using an Interferometer", D. H. Van Winkle and N. L. Swanson, at the March Meeting of the American Physical Society, 21-25 March 1994.

22. "Encouraging Student Interaction in Introductory University Physics Recitation", David H. Van Winkle, at the winter meeting of the American Association of Physics Teachers, January 1994.

PRESENTATIONS AT REGIONAL MEETINGS

2. "The Miami Program", D. H. Van Winkle, at the Florida section of the American Association of Physics Teachers Conference at Florida State University, 10-11 April 1998.

1. "Laser Diffraction Investigation of Long Range Order in DNA Liquid Crystals", D. H. Van Winkle, M. W. Davidson and R. L. Rill, at the Southeastern Section Meeting of the American Chemical Society, June 1988.

PRESENTATIONS AT WORKING SYMPOSIA

(* invited)

4. "Criterion for Pattern Instability in Nematic Electro-hydrodynamic Flow", D. H. Van Winkle, at the NATO Workshop on Nonlinear Dynamics in Simple and Complex Fluids, Los Alamos National Laboratory, Los Alamos, New Mexico 26 - 29 June 1990.

* 3. "Phase Transitions in DNA Liquid Crystals", D. H. Van Winkle, at the Workshop on "Nature of Phase Transitions in Liquid Crystals and Related Topics", Theoretical Physics Institute, University of Minnesota, 29 September - 1 October 1988.

* 2. "The Experimental Observation of the Landau-Peierls Divergence in Smectic Fields", D.H. Van Winkle and N.A. Clark, at the Second University of California Conference on Statistical Mechanics, Davis, California, 26-29 March 1986.

1. "Cross Correlation Measurement of the Decay of Orientational Order in Freely Suspended Smectic C Liquid Crystal Films", at the First Quasi-Elastic Light Scattering Symposium (QELSS-I), University of Michigan-Ann Arbor, 24 June 1982.

INVITED COLLOQUIA AND SEMINARS

"Liquid crystalline DNA", Biochemistry seminar given at Florida State University, 10 October 1995.

"Teaching Physics to Scientists and Engineers", (with Larry Dennis) at the Science Education Seminar Series at Florida State University, 17 March 1994.

"Liquid Crystals", Godby High School, October 21, 1993.

"DNA Liquid Crystals", Chemical Engineering Department Seminar, Florida State University, 3 April 1991.

"Electrohydrodynamic Flow in Nematic Liquid Crystals", D. H. Van Winkle, at the University of Florida, Department of Physics, Condensed Matter Seminar, 4 February 1991.

"Convective Flow in Liquid Crystals", D. H. Van Winkle, at the Naval Coastal Systems Center, Panama City, FL, 31 May 1990.

"Liquid Crystalline DNA", D. H. Van Winkle, Colloquium at the Liquid Crystal Institute and the Department of Physics, Kent State University, Kent Ohio, 13 September 1989.

"Liquid Crystalline DNA", D. H. Van Winkle, Colloquium at the Department of Physics, Case Western Reserve University, Cleveland Ohio, 14 September 1989.

"Liquid Crystalline DNA", D. H. Van Winkle, at the Naval Research Laboratory, Washington DC, 9 June 1989.

 

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