Maikel Rheinstädter
Assistant Professor of Physics


 

Office:

318 Physics Building

Phone:

573-882-3217

E-mail:

RheinstadterM@missouri.edu

Webpage:

http://www.rheinstaedter.de/maikel/

Biographical Information:

Doctor of natural sciences, University of Saarbrücken, Germany, 2002


Research Interests

Membrane Biophysics Using Elastic and Inelastic Neutron, X-ray and Light Scattering

While most spectroscopic techniques, as, e.g., nuclear magnetic  resonance or di­elec­tric spectroscopy probe macroscopic responses, neutron and within some restrictions also x-ray scattering experiments give the unique access to microscopic dynamics at length scales of intermolecular or atomic distances. Only recently, it has become possible to study collective dynamics of planar lipid bilayers using neutron spectroscopy techniques [1]. We determined the dispersion relation of the coherent fast picosecond density fluctuations on nearest neighbor distances of the phospholipid acyl chains in the gel and in the fluid phases of a DMPC bilayer and could shed light on the evolution of structure and dynamics in the range of the gel-fluid main phase transition. By combining different neutron scattering techniques, namely three-axis, backscattering and spin-echo spectroscopy, we present measurements of short and long wavelength collective fluctuations in biomimetic and biological membranes in a large range in momentum and energy transfer, covering time scales from about 0.1ps to almost 1ms and length scales from 3Å to about 0.1mm [1-4]. Because of optimized setups and sample preparation, inelastic neutron scattering experiments supply for the first time sufficiently strong coherent inelastic signals for quantitative analysis. The measurements offer a large window of length and time scales to test and refine theoretical models of dynamics of biomimetic and biological membranes. From a smectic hydrodynamic theory, the long wavelength dispersion relation give direct access to the elasticity parameters of the membranes in the fluid phase [3], i.e., the bilayer bending rigidity k and the compressional modulus B of the stacks.

[1] M.C. Rheinstädter, C. Ollinger, G. Fragneto, F. Demmel, T. Salditt, Phys. Rev. Lett. 93, 108107 (2004).
[2] Maikel C. Rheinstädter, Tilo Seydel, Franz Demmel, Tim~Salditt, Phys. Rev. E 71, 061908 (2005).
[3] Maikel C. Rheinstädter, Wolfgang Häußler, Tim Salditt, Phys. Rev. Lett. 97, 048103 (2006).
[4] Maikel C. Rheinstädter, Tilo Seydel, Tim Salditt, submitted, cond-mat/0607514.

Selected Publications

1.      'Atomic force microscopy (AFM) study of thick lamellar stacks of phospholipid bilayers',
Arne Schäfer,Tim Salditt and Maikel C. Rheinstädter,
in preparation.

2.      'Nanosecond molecular relaxations in lipid bilayers studied by high energy resolution neutron scattering and in-situ diffraction',
Maikel C. Rheinstädter, Tilo Seydel and Tim Salditt,
submitted, cond-mat/0607514.

3.      'Fermi surface topology and the superconducting gap function in UPd2Al3: A neutron spin-echo study',
E. Blackburn, A. Hiess, N. Bernhoeft, M.C.  Rheinstädter, W. Häußler and G.H. Lander,
Phys. Rev. Lett. 97, 057002 (2006).

4.      'Dispersion Relation of Lipid Membrane Shape fluctuations by Neutron Spin-Echo Spectrometry',
Maikel C. Rheinstädter, Wolfgang Häußler and Tim Salditt,
Phys. Rev. Lett. 97, 048103 (2006).
-Selected for listing in the August 7, 2006 issue of Virtual Journal of Nanoscale Science & Technology.
-Selected for listing in the August 1, 2006 issue of Virtual Journal of Biological Physics Research.

5.      'Exploring the Collective Dynamics of Lipid Membranes with Inelastic Neutron Scattering'
Maikel C. Rheinstädter, Tilo Seydel, Wolfgang Häußler and Tim Salditt,
accepted for publication in Journal of Vacuum Science and Technology.

6.      'The 'neutron window' of collective excitations in lipid membranes'
Maikel C. Rheinstädter, Tilo Seydel, Wolfgang Häußler and Tim Salditt,
accepted for publication in Physica B.

7.      ''

.

8.      'Structure and Dynamics of Model Membrane Systems Probed by Elastic and Inelastic Neutron Scattering',
Tim Salditt and Maikel C. Rheinstädter,
Neutron Scattering in Biology,
Techniques and Applications,
pages 503-530,
Series: Biological and Medical Physics, Biomedical Engineering
Fitter, J.; Gutberlet, T.; Katsaras, J. (Eds.)
Springer, 2006, XXIV, 558 p. 240 illus., Hardcover
ISBN: 3-540-29108-3

9.      'Molecular motions in lipid bilayers studied by the neutron backscattering technique',
Maikel C. Rheinstädter, Tilo Seydel, Franz Demmel and Tim Salditt,
Phys. Rev. E 71, 061908 (2005).
Selected for listing in the July 1, 2005 issue of Virtual Journal of Biological Physics Research.

10.   'Quantum helimagnetism of the frustrated spin 1/2 chain LiCuVO4'
M. Enderle, C. Mukherjee, B. Fåk, R.K. Kremer, J.­M. Broto, H. Rosner, S.­L. Drechsler, J. Richter, J. Malek, A. Prokofiev, W. Assmus, S. Pujol, J.­L. Raggazzoni, H. Rakoto, M. Rheinstädter and H.M. Rønnow,
Europhys. Lett. 70, 237-243 (2005).

11.   'Neutron diffraction study of He solidified in a mesoporous glass'
D.Wallacher, M.Rheinstaedter, T. Hansen and K.Knorr,
J. Low. Temp. Phys. 138, 1013 (2005).

12.   'La dynamique collective des membranes bicouches de modèle étudié par diffusion inélastique de neutrons',
M.C. Rheinstädter and T.Salditt,
J. Phys. IV France 130, 141 (2005).

13.   'Probing dynamics at Interfaces: Options for Neutron and X-ray Spectroscopy',
Maikel C. Rheinstädter, Tilo Seydel, Bela Farago and Tim Salditt,
to appear in Journal of Neutron Research, (2005),
cond-mat/0411220.

14.   'Probing dynamics at interfaces: Molecular motions in lipid bilayers studied by neutron backscattering',
Maikel C. Rheinstädter, Tilo Seydel and Tim Salditt,
Scientific Highlight, ILL Annual Report, p68 (2004).

15.   'Low dimensional ordering and fluctuations in methanol-b-hydroquinone-clathrate studied by X-ray and neutron diffraction'
Maikel C. Rheinstädter, Mechthild Enderle, Axel Klöpperpieper and Klaus Knorr,
Phys. Rev. B 71, 014109 (2005).

16.   'Quenched chirality in RbNiCl3: Linear birefringence and neutron diffraction',
Maikel C. Rheinstädter, Garry McIntyre and Mechthild Enderle
Phys. Rev. B 70, 224420 (2004).

17.   'Untersuchung der kollektiven Dynamik von Lipidmembranen mittels unelastischer Neutronenstreuung',
M.C. Rheinstädter, C. Ollinger, G. Fragneto, F. Demmel and T. Salditt,
Scientific Highlight, Komitee Forschung mit Neutronen.

18.   'Collective dynamics of lipid membranes studied by inelastic neutron scattering',
M.C. Rheinstädter, C. Ollinger, G. Fragneto, F. Demmel and T. Salditt,
Phys. Rev. Lett. 93, 108107 (2004).
Selected for listing in the September 15, 2004 issue of Virtual Journal of Biological Physics Research.

19.   'Collective dynamics in phospholipid bilayers investigated by inelastic neutron scattering: Exploring the dynamics of biological membranes with neutrons',
M.C. Rheinstädter, C. Ollinger, G. Fragneto and T. Salditt,
Physica B 350, 136 (2004).

20.   'UFO - a multi-analyser option for IN12',
Wolfgang Schmidt, Maikel C. Rheinstädter, Stephane Raymond, Michael Ohl,
Physica B 350, e849 (2004).

21.   'Magnetic structure of the heavy-fermion alloy CeCu2(Si0.5Ge0.5)2',
E. Faulhaber, O. Stockert, M. Rheinstädter, M. Deppe, C. Geibel, M. Loewenhaupt, F. Steglich,
J. Magn. Magn. Mater 272, 44 (2004).

22.   'Aging and scaling laws in b-hydroquinone-clathrate',
Maikel C.Rheinstädter, Heiko Rieger and Klaus Knorr,
Phys. Rev. B 69, 144427 (2004).

23.   'Collective dynamics of lipid membranes studied by inelastic neutron scattering',
M.C. Rheinstädter, C. Ollinger, T. Salditt, G. Fragneto, F. Demmel,
Scientific Highlight, ILL Annual Report, p74 (2003).

24.   'Aging and memory effects in a clathrate',
M.C. Rheinstädter, A.V. Kityk, H. Rieger and K. Knorr,
Eur. Phys. J. E 12, S47 (2003).

25.   'Dipolar ordering and relaxations in acetonitrile-b-hydroquinone clathrate',
M.C. Rheinstädter, A.V. Kityk, A. Klöpperpieper and K. Knorr,
Proceedings of the SCNS workshop, ILL (2002).

26.   'Strukturelle und dielektrische Untersuchungen an b-Quinol-Clathraten',
M.C. Rheinstädter,
Shaker, Berichte aus der Physik, Aachen (2002),
ISBN 3-8322-0454-7.

27.   'Dipolar ordering and relaxations in acetonitrile-b-hydroquinone clathrate',
M.C. Rheinstädter, A.V. Kityk, A. Klöpperpieper and K. Knorr,
Phys. Rev. B 66, 064105 (2002).

28.   'Aging and memory effects in b-hydroquinone-clathrate',
A.V. Kityk, M.C. Rheinstädter, K. Knorr and H. Rieger,
Phys. Rev. B 65, 144415 (2002).

29.   'Wing Chun, Physik und das Leben',
M.C.Rheinstädter,
"Insider", Zeitschrift der European Lok Yiu Wing Chun International Martial Art Association, 7 (2001).

30.   'Tuning anisotropy by impurities: Magnetocaloric experiments on CsNi0.9Fe0.1Cl3',
J. Wolf, K. Kiefer, M.C. Rheinstädter, K. Knorr and M. Enderle.
Eur. Phys. J. B 22, 461-471 (2001).

31.   'Dipolar ordering and glassy freezing in methanol-b-hydroquinone-clathrate',
H. Woll, M.C. Rheinstädter, F. Kruchten, K. Kiefer, M. Enderle, A. Klöpperpieper, J. Albers  and K. Knorr.
Phys. Rev. B 63, 224202 (2001).

32.   'Dipolar ordering and glassy freezing in a clathrate',
H. Woll, M. Enderle, A. Klöpperpieper, M.C. Rheinstädter, K. Kiefer, F. Kruchten and K. Knorr.
Europhys. Lett., 51 (4), pp. 407-412 (2000).

33.   'Phase diagram of the C60/C70 system',
D. Havlik, M. Steinmetz, P. Huber, W. Schranz, M. Enderle, and K. Knorr,
AIP Conference Proceedings, 442, 237 (1998).

34.   'Fachbereich Physik',
M. Steinmetz und K. Knorr,
Fachbereichsbroschüre des Fachbereiches Physik an der Universität des Saarlandes.
Herausgegeben vom Fachbereich Physik (1998).

35.   'Eine Apparatur zur Messung der linearen Doppelbrechung: Aufbau und Messungen an RbNiCl3 und an -Quinol-Methanol',
M. Steinmetz,
Diplomarbeit, Fachbereich Physik an der Fachbereich Physik, Universität des Saarlandes (1997).