A500 Physics
Iowa State University
Ames, Iowa 50011


Phone: (515) 294-6023
Fax: (515) 294-0689
Email: vaknin@ameslab.gov

Ph. D. 1987, Hebrew University of Jerusalem; Postdoctoral fellow, University of Pennsylvania, 1987-1990; Scientist, Physics Department, Risø National Laboratory, Denmark, 1990-1991; Ames Laboratory, 1991-present. Visiting scientist, Risø National Laboratory, Denmark, summer 1992.

RESEARCH INTERESTS

Neutron and X-ray scattering from soft condensed matter, i.e., Langmuir monolayers, 2D protein crystals, liquid and polymer surfaces, and neutron scattering from magnetic crystals, in particular magnetic properties of cuprates.

SELECTED PUBLICATIONS

D. Vaknin, J. P. Koster, Z. W. Wang, J. Zarestky, J. Fernandez-Baca, and D. C. Johnston.  “Magnetic neutron diffraction from the magnetic clusters in single crystal BaCuO_2+x” Phys. Rev. B 57, 465  (1998).

P. A. Heiney, D. Gidalevitz, N. C. Maliszewskyj, S. Satija, D. Vaknin, and W. T. Ford “Multilayer formation in a hexacylen Langmuir film,” Chemical Communications, 1998 1483-1484.

J. Gallant, B. Desbat, D. Vaknin, and C. Salesse.  “Polarization modulated infrared reflection absorption spectroscopy and x-ray reflectivity measurements of photosystem II core complex at the gas/buffer interface,” Biophys. J.  75, 2888-2899 (1998).

B. W. Gregory, D. Vaknin, J. D. Gray, B. M. Ocko, T. Cotton, and W. S. Struve.  “Two-dimensional crystallization of phthalocyanine pigment at the air-water interface,” J. Phys. Chem. 103, 502 (1999).

D. Vaknin, J. L. Zarestky, J. E. Ostenson, B. Chakoumakos, A. Goni, P.J. Pagliuso, T. Rojo, and G. E. Barberis.  “Weakly (x=0) and randomly (x=0.03) coupled Ising antiferromagnetic planes  in Li_xFe_1-xNiPO₄ compounds,” Phys. Rev. B  60, 1100 (1999).

 

D. Vaknin, J. L. Zarestky, and L. L. Miller.  “On the possibility of antiferromagnetic vortex cores in superconducting YBa₂Cu ₃O_7-x,” Physica C 329, 109 (2000).

D. Vaknin and M. S. Kelley.  “The structure of D-erythro-C18 ceramide at the air-water interface,” Biophys. J. 79, 2616 (2000).

D. Vaknin.  “X-ray diffraction techniques to characterize liquid surfaces and monomolecular layers at gas-liquid interfaces,” http://xxx.lanl.gov/ps/cond-mat/0101142 (2001).

Publications in press, accepted and submitted

J. L. Zarestky, D. Vaknin, B. Chakoumakos, A. Goni, P.J. Pagliuso, T. Rojo, and G. E. Barberis.  “Antiferromagnetism in Li₃Fe₃(PO₄)₃,” Magnetism Mag. Mater. (submitted).

D. Vaknin, L. L. Miller, M. Eshel, and A. Bino. “Magnetic molecules at the air/water interface,” J. Phys. Chem. B (submitted).

D. Vaknin, J. L. Zarestky, L. L. Miller On the possibility of antiferromagnetic vortex cores in superconducting YBa2Cu3O7-x, Physica C 329, 109 (2000).

B. W. Gregory, D. Vaknin, J. D. Gray, B. M. Ocko, T. Cotton, W. S. Struve Two-dimensional crystallization of phthalocyanine pigment at the air-water interface,
J. Phys. Chem. 103, 502 (1999).

D. Vaknin, J. L. Zarestky, J. E. Ostenson, B. Chakoumakos, A. Goni, P. J. Pagliuso, T. Rojo, G. E. Barberis Weakly (x=0) and randomly (x=0.03) coupled Ising antifermagnetic planes in LixFe1-xNiPO4 compounds, Phys. Rev. B 60, 1100 (1999).

D. Vaknin, J. P. Koster, Z. W. Wang, J. Zarestky, J. Fernandez-Baca, D. C. Johnston Magnetic neutron diffraction from the magnetic clusters in single crystal BaCuO2-x, Phys. Rev. B 57, 465 (1998).


D. Vaknin, L. L. Miller, J. L. Zarestky, D. C. Johnston. Elastic and quasielastic neutron scattering study of the spin 1/2 square lattice antiferromagnet Sr₂CuO₂Cl₂ Physica C 274,331 (1997).



D. Vaknin, L. L. Miller, J. L. Zarestky. Stacking of the square-lattice antiferromagnetic planes of Ca₂CuO₂Cl₂. Phys. Rev. B 56, 8351 (1997).



D, Vaknin, J. P. Koster, J. L. Zarestky, Z. R. Wang, J. A. Fernandez-Baca, D. C. Johnston. Magnetic neutron diffraction from the magnetic clusters in single crystal
BaCuO_2+x. Phys. Rev. B 57, 465 (1998).



D. Vaknin, J. L. Zarestky, J. E. Ostenson, B. C. Chakoumakos, A. Goni, P. J. Pagliuso, T. Rojo, G. E. Barberis. Weakly (x=0) and randomly coupled Ising antiferromagnetic planes in (Li_1-3xFe_x)NiPO₄. Phys. Rev. BÊ xxx (1999).



D. Vaknin. C₆₀-amine adducts at the air-water interface: A new class of Langmuir monolayers Physica B221, 152 (1996).



D. Ducharme, D. Vaknin, M. Paulder, C. Salesse, H. Riegler, H. Möhwald Surface properties of valine-gramicidin A at the air-water interface Thin Solid Films90, 284 (1996).



B. W. Gregory, D. Vaknin, J. D. Gray, B. M. Ocko, P. Stroeve, T. M. Cotton, W. S. Struve. Two-dimensional pigment monolayer assemblies for light harvesting applications. 1. Structural characterization at the air/water interface with x-ray specular reflectivity and on solid substrates by optical adsorption spectroscopy J. Phys. Chem. 101, 2006 (1997).



B. W. Gregory, D. Vaknin, J. D. Gray, B. M. Ocko, P. Stroeve, T. M. Cotton. Two dimensional crystallization of phthalocyanine pigments at the air/water interface. J. Phys. Chem. 103, 502 (1999).