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Kontakt

Prof. Dr. Siegfried Stapf
Fachgebietsleiter

+49 3677 69-3671
Siegfried.Stapf@tu-ilmenau.de

Unterpörlitzer Straße 38 (Heisenbergbau)
Raum 212

Kontaktformular

  • Startseite
  • Universität
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  • Fakultät Mathematik und Naturwissenschaften
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  • Institut für Physik
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  • Fachgebiet Technische Physik II
  • Publikationen
  • Veröffentlichungen

  • I. Brekotkin, N. Fatkullin, K. Lindt, C. Mattea, S. Stapf
    On the theory of the spin I=1/2 double quantum NMR: effects of spin spatial displaces between RF pulses
    J. Chem. Phys. 157, 224108/1-7 (2022)
     
  • B. Gizatullin, C. Mattea, S. Stapf
    Three mechanisms of Room Temperature Dynamic Nuclear Polarization occur simultaneously in an Ionic Liquid
    Phys. Chem. Chem. Phys. 24, 27004-27008 (2022)
     
  • B. Gizatullin, C. Mattea, I. Shikhov, C. Arns, S. Stapf
    Modelling molecular interactions with wetting and non-wetting rock surfaces by combining Electron Paramagnetic Resonance and NMR relaxometry
    Langmuir 38, 11033 (2022)
     
  • K. Lindt, C. Mattea, S. Stapf, I.K. Ostrovskaya, N.F. Fatkullin
    The deuteron NMR Hahn echo decay in polyethylene oxide melts
    AIP Advances 12, 075219 (2022)

  • Y. Cao, Y. Wu, X. Tang, Q. Xu, S. Stapf, C. Mattea, W. Li
    Long-term efficiency for reducing entanglements of nascent polyethylene by a polystyrene modified Ziegler-Natta catalyst
    J. Appl. Polymer Sci., 51790 (2021)
     
  • K. Lindt, B. Gizatullin, C. Mattea, S. Stapf
    Non-exponential 1H and 2H NMR relaxation and self-diffusion in asphaltene-maltene solutions
    Molecules, 26, 05218 (2021)
     
  • A. Cretu, C. Mattea, S. Stapf,
    Low-field and variable-field NMR relaxation studies of H2O and D2O molecular dynamics in articular cartilage
    PLOS ONE, 16, 0256177 (2021)
     
  • Y. Wu, H. Yang, W. Li, C. Mattea, S. Stapf, L. Zhang, C. Ye, X. Ye
    Tailored Crystalline Order of Nascent Polyethylene from Metallocene Supported on Confined Polystyrene
    Catalysis Today, 368, 272-280 (2021)
     
  • B. Gizatullin, M. Gafurov, F. Murzakhanov, A. Vakhin, C. Mattea, S. Stapf
    Molecular dynamics and proton hyperpolarization via synthetic and crude oil porphyrin complexes in solid and solution state
    Langmuir, 37, 6783-6791 (2021)
     
  • B. Gizatullin, C. Mattea, S. Stapf
    Molecular Dynamics in Ionic Liquid/Radical Systems
    J. Phys. Chem. B, 125, 4850-4862 (2021)
     
  • B. Gizatullin, E. Papmahl, C. Mattea, S. Stapf
    Quantifying crude oil contamination in sand and soil by EPR spectroscopy
    Appl. Magn. Regson., 52, 633-648 (2021)
     
  • B. Gizatullin, C. Mattea, S. Stapf
    Field-cycling NMR and DNP - A friendship withe benefits
    Journal of Magnetic Resonance, 322, 106851 (2021)

  • I. K. Ostrovskaya, N. F. Fatkullin, T. Körber, E. A. Rössler, A. Lozovoi, C. Mattea, S. Stapf
    On the theory of deuteron NMR Free Induction Decay of reptating polymer chains: Effect of end segment dynamics
    J. Chem. Phys., 152, 184904 (2020)
     
  • A. Cretu, C. Mattea, S. Stapf, I. Ardelean
    The Effect of Silica Fume and Organosilane Addition on the Porosity of Cement Paste
    Molecules, 25, 1762/1-9 (2020)
     
  • S. Ghoshal, C. Mattea, P. Denner, S. Stapf
    Effect of Initial Conformation on the Starch Biopolymer Film Formation Studied by NMR
    Molecules, 25, 1227/1-17 (2020)
     
  • J. Poonoosamy, S. Haber-Pohlmeier, H. Deng, G. Deissmann, M. Klinkenberg, B. Gizatullin, S. Stapf , F. Brandt, D. Bosbach, A. Pohlmeier
    Combination of MRI and SEM to assess changes in chemical properties and permeability of porous media due to barite precipitation
    Minerals, 10, 226/1-20 (2020)
     
  • J. Stepisnik, C. Mattea, S. Stapf, A. Mohoric
    Molecular velocity auto-correlations in glycerol/water mixtures studied by NMR MGSE method
    Physica A, 553, 124171 (2020)
     
  • Y. Wu, H. Yang, W. Li, C. Mattea, S. Stapf, L. Zhang, C. Ye, X. Ye
    Tailored Crystalline Order of Nascent Polyethylene from Metallocene Supported on Confined Polystyrene
    Catalysis Today, 368, 272-280 (2021)

  • B. Gizatullin, M. Gafurov, A. Vakhin, A. Rodionov, G. Mamin, S. Orlinskii, C. Mattea, S. Stapf
    Native Vanadyl Complexes in Crude Oil as Polarizing Agents for In-situ  Proton Dynamic Nuclear Polarization
    Energy & Fuels, 33, 10923-10932 (2019)
     
  • B. Gizatullin, C. Mattea, S. Stapf
    Hyperpolarization by DNP and Molecular Dynamics: Eliminating the Radical Contribution in NMR Relaxation Studies
    J. Phys. Chem. B, 46, 9963-9970 (2019)
     
  • B. Gizatullin, C. Mattea, S. Stapf
    X-nuclei Hyperpolarization for Studying Molecular Dynamics by DNP-FFC
    J. Magn. Reson, 307, 106583/1-10 (2019)
     
  • A. Ordikhani Seyedlar, S. Stapf,  C. Mattea
    Nuclear Magnetic Relaxation and Diffusion Study of the Ionic Liquids 1‐ethyl‐ and 1‐butyl‐3‐methylimidazolium bis (trifluoromethylsulphonyl)imide Confined in Porous Glass
    Magn. Reson. Chem., 57 , 818-828 (2019)
     
  • B. Phani Kumar, S. Stapf, C. Mattea
    Molecular Dynamics in the Lyophases of Copolymer P123 Investigated with FFC NMR Relaxometry
    Langmuir, 35, 435-445 (2019)
     
  • O.V. Petrov, S. Stapf
    Multi-component analysis of T1 relaxation in bovine articular cartilage at low magnetic fields
    Magn. Reson. Med., 81, 2158-2168 (2019)
     
  • C. Mattea, B. Gizatullin, S. Stapf
    Dynamics of ionic liquids in poly(vinyl alcohol) porous scaffold. Low field NMR study
    Magn. Reson. Imaging, 56, 126-130 (2019)
     
  • I. Shikhov, A. Rawal, B. Gizatullin, C. Arns, D. Thomas, J. Hook, S. Stapf, Y. Yao
    Application of low-field, 1H/13C high-field solution and solid state NMR for characterisation of oil fractions responsible for wettability change in sandstones

    Magn. Reson. Imaging, 56, 77-85 (2019)
     
  • B. Gizatullin, C. Mattea, S. Stapf
    Overhauser DNP FFC study of block copolymer diluted solution
    Magn. Reson. Imaging, 56, 96-102 (2019)
     
  • B. Gizatullin, I. Shikhov, C. Arns, C. Mattea, S. Stapf
    On the influence of wetting behavior on relaxation of adsorbed liquids – a combined NMR, EPR and DNP study of aged rocks
    Magn. Reson. Imaging, 56, 63-69 (2019)
     
  • A. Cretu, C. Mattea, S. Stapf, I. Ardelean
    The effect of silica nanoparticles on the pore structure of hydrating cement paste: a spatially resolved low-field NMR study
    Molecular Physics, 117, 1006-1014 (2019)
     
  • C. Cadar, A. Cretu, M. Moldovan, C. Mattea, S. Stapf, I. Ardelean
    NMR T1–T2 correlation analysis of molecular absorption inside a hardened cement paste containing silanised silica fume
    Molecular Physics, 117, 1000-1005 (2019)

  • A. Lozovoi, C. Mattea, N. Fatkullin, S. Stapf
    Segmental dynamics of entangled polyethylene oxide melts:  deviations from the tube-reptation model
    Macromolecules 51, 10055–10064 (2018)
     
  • L. Wei, Y. Zhen, A. Lozovoi, O. Petrov, C. Mattea, S. Stapf
    Heterogeneous Distribution of Chain Mobility in Nascent UHMWPE in the Weakly Entangled State
    J. Polym. Res. 25, 239 (2018)

     
  • B. Gizatullin, M. Gafurov, A. Rodionov, G. Mamin, C. Mattea, S. Stapf, S. Orlinskii
    Proton-radical interaction in crude oil – a combined NMR and EPR study
    Energy & Fuels, 32,
    11261–11268 (2018)
     
  • T. Überrück, O. Neudert, K.-D. Kreuer, B. Blümich, J. Granwehr, S. Stapf, S. Han
    Effect of nitroxide spin probeson the transport properties of Nafion membranes
    Phys. Chem. Chem. Phys.20, 26660-26674 (2018)

     
  • J. Stepisnik, C. Mattea, S. Stapf, A. Mohoric
    Molecular velocity auto-correlation of simple liquids observed by NMR MGSE method
    Eur. Phys. J. B, 91, 293 (1-9) (2018)
     
  • C. Fraenza, C. Mattea, G. Farrher, A. Ordikhani-Seyedlar, S. Stapf, E. Anoardo
    Rouse dynamics in PEO-PPO-PEO block-copolymers in aqueous solution as observed through fast field-cycling NMR relaxometry
    Polymer, 150, 244-253 (2018)
     
  • B. Zhou, Z. Liao, C. Mattea, S. Stapf, H. Jiao, Z. Zhuang, B. Jiang, J. Wang, Y. Yang
    Solvents molecular mobility in coked catalyst ZSM-5 studied by NMR relaxation and Pulsed Field Gradient techniques
    Ind. Eng. Chem. Res. 57, 6647-6653 (2018)
     
  • Q. Zhou, J. Zhang, W. Li, O. Petrov, C. Mattea, S. Stapf
    Improved miscibility of PA6 and chitosan by the electric-field assisted phase inversion
    Carbohydrate Polymers 189, 15-21 (2018)
     
  • C. Mattea, A. Ordikhani-Seyedlar, P. de Almeida Silva, S. Stapf
    Molecular transport in ionic liquids under confinement studied by low field NMR
    Microporous Mesoporous Mater., 269, 171-174 (2018)
     
  • O.V. Petrov, E. Rössler, C. Mattea, M.T. Nieminen, P. Lehenkari, S. Karhula, S. Saarakkala, S. Stapf
    Low-Field NMR Relaxation Times Distributions and Their Magnetic Field Dependence as a Possible Biomarker in Cartilage
    IFMBE Proceedings, 65
    , 952-955 (2018)
     
  • A. Ordikhani-Seyedlar, J. P. de Almeida Martins, P. J. Sebastião, M.J. Jardim Beira, S. Stapf, F. Vaca Chavez, C. Mattea
    Dynamics of binary mixtures of ionic liquids and ethanol by NMR
    Magn. Reson. Chem., 56, 108-112 (2018)
     
  • O. Neudert, C. Mattea, S. Stapf
    Application of CPMG acquisition in fast field-cycling relaxometry
    Microporous  Mesoporous Mater., 269, 103-108 (2018)
     
  • E. Rößler, C. Mattea, S. Stapf, S. Karhula, S. Saarakkala, M. T. Nieminen
    Load-dependent NMR low-field profiling and relaxation dispersion study of osteoarthritic articular cartilage
    Microporous Mesoporous Mater., 269, 160-165 (2018)

  • A. Lozovoi, L. Petrova, C. Mattea, S. Stapf, E. Rössler, N. Fatkullin
    On the theory of the proton dipolar-correlation effect as a method for investigation of segmental displacement in polymer melts
    J. Chem. Phys., 147, 074904/1-9 (2017)
     
  • B. Gizatullin, O. Neudert, S. Stapf, C. Mattea
    Dynamic nuclear polarization fast field cycling method for selective study of molecular dynamics in block copolymers
    Chem. Phys. Chem., 18, 2347-2356 (2017)
     
  • A. Lozovoi, C. Mattea, M. Hofmann, K. Saalwächter, N. Fatkullin, S. Stapf
    Segmental dynamics of polyethylene-alt-propylene studied by NMR spin echo techniques
    J. Chem. Phys., 146, 224901 (2017)
     
  • A. Ordikhani-Seyedlar, S. Stapf, C. Mattea
    Cation dynamics in supercooled and solid alkyl methylimidazolium bromide ionic liquids
    J. Phys. Chem. B, 121, 5363-5373 (2017)

     
  • O.V. Petrov, S. Stapf
    Parameterization of NMR relaxation curves in terms of logarithmic moments of the relaxation time distribution
    J. Magn. Reson.
    279, 39-48 (2017)
     
  • E. Rößler, C. Mattea, S. Saarakkala, P. Lehenkari, M. Finnilä, L. Rieppo, S. Karhula, M.T. Nieminen, S. Stapf
    Correlations of low-field NMR and variable-field NMR parameters with osteoarthritis in human articular cartilage under load
    NMR in Biomedicine 30, 1-14 (2017).
     
  • B. V. N. Phani Kumar, C. Mattea, S. Stapf & R. Dabrowski
    Influence of underlying local organisations in typical nematic phase of 6CHBT and induced nematic phase of bicomponent liquid crystalline systems 4DBT–12CB – a Fast Field Cycling NMR investigation
    Liquid Crystals, 44, 1494-1505 (2017)
     
  • O. Neudert, C. Mattea, S. Stapf
    Molecular dynamics-based selectivity for Fast-Field-Cycling relaxometry by Overhauser and solid effect dynamic nuclear polarization
    J. Magn. Reson. 276, 113 (2017)
     
  • C. Lenk, C. Mattea, S. Stapf, J. M. Köhler
    Optimising sodium silica gel for Ferroin immobilization
    J. Porous Mater., 24, 923 (2017)

  • J. Sun, M. Chen, H. Wang, B. Jiang, C. Mattea, S. Stapf, J. Wang, Z. Liao, Y. Yang
    PFG-NMR measurement of self-diffusion coefficients of long-chain alpha-olefins and their mixture in semicrystalline polyethylene
    J. Appl. Polym. Sci. 133, 1-8 (2016)
     
  • O. Neudert, C. Mattea, S. Stapf
    A compact X-Band resonator for DNP-enhanced Fast-Field-Cycling NMR
    J Magn. Reson.  271, 7 (2016)
     
  • E. Silletta, M. Velasco, C. Gomez, M. Strumia, S. Stapf, C. Mattea, G. Monti, R. Acosta
    Enhanced surface interaction of water confined in hierarchical porous polymers induced by hydrogen bonding
    Langmuir 32, 7427 (2016)
     
  • A. Lozovoi, C. Mattea, A. Herrmann, E. Roßler, S. Stapf, N. Fatkullin
    Proton NMR dipolar-correlation effect as a method for investigating segmental diffusion in polymer melts
    J. Chem. Phys. (Communication) 144, 241101 (2016)
     
  • A. Ordikhani-Seyedlar, O. Neudert, S. Stapf, C. Mattea, R. Kausik, D. E. Freed, Y.-Q. Song, M. D. Hürlimann
    Evidence of aromaticity-specific maltene NMR relaxation enhancement promoted by semi-immobilised radicals
    Energy & Fuels 30, 3886-3893 (2016)
     
  • Y. Gossuin, T. Orlando, M. Basini, D. Henrard, A. Lascialfari, C. Mattea, S. Stapf, Q. Vuong
    NMR relaxation induced by iron oxide particles: testing theoretical models
    Nanotechnology 27, 155706/1-11 (2016)
     
  • F. Bajd, C. Mattea, S. Stapf, I. Sersa
    Diffussion tensor MR microscopy of tissues with low diffusional snisotropy
    Radiology & Oncology, 50, 175 (2016)
     
  • M. Velasco, E. Silletta, C. Gomez, M. Strumia, S. Stapf, G. Monti, C. Mattea, and R. Acosta
    Spatially Resolved Monitoring of Drying of Hierarchical Porous Organic Networks
    Langmuir 32, 2067-2074 (2016).

  • M. Bukharov, V. Shtyrlin, G. Mamin, S. Stapf, C. Mattea, A. Mukhtarov, N. Serov, E. Gilyazetdinov
    Structure and Dynamics of Solvation Shells of Copper(II) Complexes with N,O-Containing Ligands
    Inorg. Chem., 54, 9777 (2015)
     
  • Q. Zhang, J. Wang, B. Jiang, Y. Yang, Y. Zhou, S. Stapf, C. Mattea, Q. Gong
    Particle motion in two- and three-phase fluidized bed reactors determined by PFG NMR
    Chem. Eng. Technol. 38, 1269-1276 (2015)
     
  • M. Chen, B. Jiang, J. Wang, Y. Yang, S. Stapf, C. Mattea, Q. Gong
    Investigation of the extraction process in gel-spinning technology of UHMWPE fibers by low-field NMR
    J. Appl. Poly. Sci., 132, 42018 (2015)
     
  • A. Ordikhani-Seyedlar, S. Stapf, C. Mattea
    Dynamics of the Ionic Liquid 1-Butyl-3-Methylimidazolium Bis(Trifluoromethylsulphonyl)imide studied by Nuclear Magnetic Resonance Dispersion and Diffusion
    Phys. Chem. Chem. Phys., 17, 1653 (2015)
     
  • E. Rössler, C. Mattea, S. Stapf
    Feasibility of high-resolution one-dimensional relaxation imaging at low magnetic field using a single-sided NMR scanner applied to articular cartilage
    J. Magn. Reson., 251, 43 (2015)
     
  • M. Contreras, C. Mattea, J. Rueda, S. Stapf, F. Bajd
    Synthesis and Characterization of Block Copolymers from 2-Oxazolines
    Designed Monomers and Polymers, 18, 170-179 (2015)
     
  • S. Stapf, A. Ordikhani-Seyedlar, C. Mattea, R. Kausik, D. E. Freed, Y.-Q. Song, M. D. Hürlimann
    Fluorine tracers for the identification of molecular interaction with porous asphaltene aggregates in crude oil
    Microporous Mesoporous Mater., 205, 56-60 (2015)
     
  • O. Neudert, C. Mattea, S. Stapf, M. Reh, H.W. Spieß, K. Münnemann
    Fast-Field-Cycling Relaxometry enhanced by Dynamic Nuclear Polarization
    Microporous Mesoporous Mater., 205, 70-74 (2015)
     
  • E. Rössler, C. Mattea, S. Stapf
    NMRD investigations of enzymatically degraded bovine articular cartilage
    Magn. Reson. Medicine, 73, 2005-2014 (2015)
     
  • S. Haber-Pohlmeier, S. Stapf, A. Pohlmeier
    NMR fast field cycling relaxometry of unsaturated soils
    Appl. Magn. Reson. 45, 1099-1115 (2014)
     
  • C. Badea, A. Pop, C. Mattea, S. Stapf, I. Ardelean
    The effect of curing temperature on early hydration of gray cement via fast field cycling-NMR relaxometry
    Appl. Magn. Reson., 45, 1299 (2014)
     
  • N. Fatkullin, S. Stapf, M. Hofmann, R. Meier, E.A. Rössler
    Proton spin dynamics in polymer melts: new perspectives for experimental investigations of polymer dynamics
    J. Non-Cryst. Solids, 407, 309 (2014)
     
  • J. Stepisnik, A. Mohoric, C. Mattea, S. Stapf and I. Sersa
    Velocity autocorrelation spectra in molten polymer measured by NMR modulated gradient spin-echo
    E. Phys. Lett., 106, 27007 (2014)
     
  • M. Bukharov, V. Shtyrlin, A.Mukhtarov, G. Mamin, S. Stapf, C. Mattea, A. Krutikov, A.N Il'in and N. Serov
    Structural and dynamic characteristics of copper(II) amino acid complexes in solutions by combined EPR and NMR relaxation methods
    Phys. Chem. Chem. Phys., 16, 9411 (2014)
     
  • S. Stapf , A. Ordikhani-Seyedlar , N. Ryan , C. Mattea , R. Kausik , D. Freed , Y.-Q. Song and M. Hurlimann
    Probing maltene-asphaltene interaction in crude oil by means of NMR relaxation
    Energy & Fuels, 28, 2395–2401 (2014)
     
  • O. Neudert, H.-P. Raich, C. Mattea, S. Stapf, K. Münnemann
    An Alderman-Grant resonator for S-Band Dynamic Nuclear Polarization
    J. Magn. Reson. 242, 79 (2014)
     
  • S. Ghoshal, S. Stapf and C. Mattea
    Protein renaturation in the gelatin film formation process
    Appl. Magn. Reson., 45, 145 (2014)
     
  • B. Jiang, Y. Yang, L. Du, C. Mattea, J. Wang, S. Stapf and Y. Yang
    Solvent diffusion in silica/poly[styrene-co-(acrylic acid)] core-shell microspheres by pulsed field gradient NMR techniques
    Journal of Applied Polymer Science, 131, 40160 (2014)
     
  • N. Fatkullin, C. Mattea, S. Stapf
    On the theory of Double Quantum NMR in polymer systems: the second cumulant approximation for many spin I=1/2 systems
    J. Chem. Phys. 139, 194905 (2013)
     
  • O. Neudert, C. Mattea, H. W. Spiess, S. Stapf, K. Münnemann
    Comparative study of 1H and 19F Overhauser DNP in fluorinated benzenes
    Physical Chemistry Chemical Physics,15,  20717 (2013)
     
  • E. Rössler, S. Stapf, N. Fatkullin
    Recent NMR investigations on molecular dynamics of polymer melts in bulk and in confinement
    Current Opinion in Colloid & Interface Science, 18, 173 (2013)
     
  • B. Jiang, Y. Yang, L.J. Du, J.D. Wang, Y.R. Yang, S. Stapf
    Advanced catalyst technology for broad/bimodal polyethylene, achieved by polymer-coated particles supporting hybrid catalyst
    Ind. Eng. Chem. Res., 52, 2501 (2013)
     
  • M. Raue, A. Bernet, M. Küppers, S. Stapf, H.-W. Schmidt, B. Blümich
    T. Mang, Sodium NMR relaxation – a versatile non-invasive tool for the monitoring of phase transitions and the estimation of effective pore sizes of supramolecular hydrogels
    Prog. Colloid Polymer Sci., 140, 45 (2013)
     
  • M. Raue, J. Martins, M. Küppers, T. Mang, B. Blümich, S. Stapf
    Visualization of hydrogel shrinkage due to ion replacement by 27Al and 23Na magnetic resonance imaging
    Prog. Colloid Polymer Sci., 140, 35 (2013)
     
  • C. Mattea, S. Ghoshal, E. Pabianczyk and S. Stapf
    Poly(vinyl alcohol)Film Formation Process Using Single-Sided Low-Field NMR Relaxometry: Effect of Initial Concentration
    Microporous & Mesoporous Materials, 178, 27, (2013)
     
  • S. Muncaci, C. Mattea, S. Stapf, and I. Ardelean
    Frequency-dependent NMR relaxation of liquids confined inside porous media containing an increased amount of magnetic impurities
    Magn. Reson. Chem. 51, 123 (2013)
     
  • N. Fatkullin, A. Gubaidullin, C. Mattea, and S. Stapf
    On the theory of the proton free induction decay and Hahn echo in polymer systems: The role of intermolecular magnetic dipole-dipole interactions and the modified Anderson–Weiss approximation
    J. Chem. Phys. 137, 224097 (2012)
     
  • S. Ghoshal, C. Mattea, L. Du, and S. Stapf
    Concentration and Humidity Effect on Gelatin Films Studied by NMR
    Z. Phys. Chem. 226, 1259 (2012), DOI 10.1524/zpch.2012.0310
     
  • Q. Vuong, S. Van Doorslaer, J.-L. Bridot, C. Argante, G. Alejandro, R. Hermann, S. Disch, C. Mattea, S. Stapf, Y. Gossuin
    Paramagnetic nanoparticles as potential MRI contrast agents: characterization, NMR relaxation, simulations and theory
    Magn. Reson. Mater. Phys. Biol. Med. (MAGMA) , in Press (2012)
     
  • T. Shakirov, N. Fatkullin, S. Stapf, P. Khalatur, R. Kimmich
    Computer simulation of polymer dynamics under confinement in straight cylindrical tubes: cooperativity and onset of the corset effect
    Polym. Sci  A, in press
     
  • S. Ahola, V. Telkkia, S. Stapf
    Velocity distributions in a micromixer measured by NMR imaging
    Lab on a Chip (DOI: 10.1039/c2lc21214e)
     
  • S. Ghoshal, P. Denner, S. Stapf, C. Mattea
    Study of the Formation of Poly(vinyl alcohol) Films
    Macromolecules 45, 1913 (2012)
     
  • R. Nechifor, I. Ardelean, C. Mattea, S. Stapf, M. Bogdan
    NMR relaxation dispersion of Miglyol molecules confined inside polymeric microcapsules
    Magn. Reson. Chem.  49, 730 (2011)
     
  • S. Ghoshal, P. Denner, S. Stapf, C. Mattea
    Structural and dynamical heterogeneities in PVA films induced by evaporation during the formation process
    Chem. Phys. Lett., 515, 231 (2011)
     
  • E. Roessler, C. Mattea, A. Mollova, S. Stapf
    Low-field one-dimensional and direction-dependent relaxation imaging of bovine articular cartilage 
    J. Magn. Reson., 213, 112 (2011)
     
  • L. Stingaciu, L. Weihermüller, A. Pohlmeier, S. Stapf, H. Vereecken
    Determination of soil hydraulic properties using magnetic resonance techniques and classical soil physics measurements
    AIP Conf. Proc. 1330, 77 (2011)
     
  • L. Buljubasich, B. Blümich, S. Stapf
    Monitoring mass transport in heterogeneously catalyzed reactions by field-gradient NMR for assessing reaction efficiency in a single pellet
    J. Magn. Reson., 212, 47 (2011)
     
  • N. Fatkullin, C. Mattea, S. Stapf
    A simple scaling derivation of the shear thinning power law exponent in entangled polymer melts
    Polymer, 52, 3522 (2011)
     
  • O. Neudert, S. Stapf, C. Mattea
    Molecular exchange of n-hexane in zeolite sieves studied by diffusion-diffusion and T1-diffusion NMR exchange spectroscopy
    New J. of Physics, 13, 035018 (2011)
     
  • X. Shi, J. Wang, B. Jiang, Y. Yang, C. Mattea, S. Stapf
    Effects of thermo-oxidative aging on chain mobility, phase composition and mechanical behaviour of high density polyethylene
    Polymer Engineering & Science, 51, 2171 (2011)
     
  • A. Omrani, A. Mollova, C. Mattea, S. Stapf
    Relaxation times and in situ kinetic analysis during network evolution of epoxy via a Nickel catalyst of Imidazole Polymer Testing
    Thermochimica Acta, 516, 52 (2011)
     
  • O. Neudert, S. Stapf, C. Mattea
    Diffusion exchange NMR spectroscopy in inhomgeneous magnetic fields
    J. Magn. Reson. 208, 256 (2011)
     
  • S. Ghoshal, C. Mattea, P. Denner, S. Stapf
    Heterogeneities in gelatin film formation using single-sided NMR
    J. Phys. Chem. B, 114, 16356 (2010)
     
  • L. Buljubasich, B. Blümich, S. Stapf
    Quantification of H2O2 Concentrations in Aqueous Solutions by means of combined NMR and pH Measurements
    Phys. Chem. Chem. Phys., 12, 13166 (2010)
     
  • N. Fatkullin, A. Gubaidullin, S. Stapf
    Features of polymer chain dynamics as revealed by intermolecular nuclear magnetic dipole-dipole interaction: model calculations and field-cycling NMR relaxometry
    J. Chem. Phys. 132, 094903/1-17 (2010)
     
  • S. Haber-Pohlmeier, S. Stapf, A. Pohlmeier
    Water flow monitored by tracer transport in natural porous media using MRI
    Vadose Zone J. 9, 835 (2010)
     
  • S. Haber-Pohlmeier, S. Stapf, D. van Dusschoten, A. Pohlmeier
    Relaxation in a natural soil: comparison of relaxometric imaging, T1-T2 correlation and fast-field cycling NMR
    The Open Magn. Reson. J. 3, 57-62 (2010)
     
  • S. Ghoshal, C. Mattea, S. Stapf
    Inhomogeneity in the drying process of gelatine film formation. NMR microscopy and relaxation study
    Chem. Phys. Lett. 485, 343-347 (2010)
     
  • L. R. Stingaciu, L. Weihermüller, S. Haber-Pohlmeier, S. Stapf, H. Vereecken, A. Pohlmeier
    Determination of pore size distribution and hydraulic properties from Nuclear Magnetic resonance (NMR) relaxometry: a comparison study of laboratory methods
    Water Res. Res. 46, W 11510 (2010)
     
  • L. Buljubasich, B. Blümich, S. Stapf
    Reaction Monitoring of Hydrogen Peroxide decomposition by NMR Relaxometry
    Chem. Eng. Sci. 65, 1394-1399 (2010)
     
  • S. Ayalur-Karunakaran, B. Blümich, S. Stapf
    Chain dynamics of a weakly adsorbing polymer in thin films
    Langmuir 25, 12208-12216 (2009)
     
  • L. Buljubasich, B. Blümich, S. Stapf
    Investigation of the heterogeneous catalytic decomposition of H2O2
    AIP Conf. Proc. 1081, 67-70 (2008)
     
  • L. R. Stingaciu, A. Pohlmeier, D. van Dusschoten, L. Weihermüller, P. Blümler, S. Stapf, H. Vereecken
    Investigation of unsaturated porous media by high-field and low-field NMR relaxometry
    Water Res. Res. 45, W08412 (2009)
     
  • A. Pohlmeier, S. Haber-Pohlmeier, S. Stapf
    A Fast field cycling NMR relaxometry study of natural soils
    Vadose Zone J. 8, 735-742 (2009)
     
  • S. Ayalur-Karunakaran, B. Blümich, S. Stapf
    NMR investigations of polymer dynamics in a partially filled porous matrix
    Eur. Phys. J. E 26, 43-54 (2008)
     
  • X.W. Yan, X.H. Ren, S. Stapf, J.D. Wang, Y.R. Yang
    Self-diffusion coefficients of organic solvents in linear and branched high density polyethylene particles measured by PFG NMR
    Chin. Chem. Lett. 19, 110-114 (2008)
     
  • D. Papadopoulos, M.A. Voda, S. Stapf, F. Casanova, M. Behr, B. Blümich
    Magnetic field simulations in support of interdiffusion quantification with NMR
    Chem. Eng. Sci. 63, 4694-4703 (2008)
     
  • X.W. Yan, J.D. Wang, X.H.Ren, Y.R. Yang, B.B. Jiang, M.A. Voda, M. Bertmer, S. Stapf
    Phase structures of nascent polyethylene powderstudied by wideline proton NMR
    Chin. J. Chem. 25, 863-868 (2007)
     
  • B. Blümich, L. B. Datsevich, A. Jess, T. Oehmichen, X. Ren, S. Stapf
    Chaos in catalyst pores – can we use it for process development?
    Chem. Eng. J. 134, 35-44 (2007)
     
  • S. Ahola, J. Perlo, F. Casanova, S. Stapf, B. Blümich
    Multiecho sequence for velocity-imaging in inhomogeneous rf fields
    J. Magn. Reson. 182, 143-151 (2006)
     
  • J. Zhou, Y.R. Yang, X.H. Ren, S. Stapf
    Investigation of reinforcement of the modified carbon black from wasted tires by nuclear magnetic resonance
    J. Zhejiang Univ Science A 7, 1440-1446 (2006)
     
  • S. Ahola, F. Casanova, J. Perlo, K. Münnemann, B. Blümich, S. Stapf
    Monitoring of fluid motion in a micromixer by dynamic NMR microscopy
    Lab on a Chip 6, 90-95 (2006)
     
  • S. Harms, S. Stapf, B. Blümich
    Application of k-space and q-space encoding NMR techniques on granular media in a 3D model fluidised bed reactor
    J. Magn. Reson. 178, 308-317 (2006)
     
  • E. Groß-Hardt, A. Amar, S. Stapf, A. Pfennig, B. Blümich
    Flow Dynamics Inside a Single Levitated Droplet
    Ind. Eng. Chem. Res. 45, 416-423 (2006)
     
  • T. Merzliak, I. Bartusseck, S. Stapf, M. A. Voda, B. Blümich, A. Pfennig
    Description of Intra-Diffusion in Liquid Mixtures
    Fluid Phase Equilibria 245, 158-167 (2006)
     
  • S. Stapf, S. Kariyo
    Dependence of order and dynamics in polymers and elastomers under deformation revealed by NMR techniques
    Acta Phys. Pol. A 108, 247-259 (2005)
     
  • A. Amar, E. Groß-Hardt, A. A. Khrapitchev, S. Stapf, A. Pfennig, B. Blümich
    Visualizing Flow Vortices Inside a Single Levitated Drop
    J. Magn. Reson. 177, 74-85 (2005)
     
  • A. Amar, S. Stapf, B. Blümich
    Internal fluid dynamics in levitated drops by fast Magnetic Resonance Velocimetry
    Phys. Rev.E 72, 030201 (2005)
     
  • X. Ren, S. Stapf, B. Blümich
    Magnetic resonance visualisation of flow and pore structure in packed beds with low aspect ratio
    Chem. Eng. Technol. 28, 219-225 (2005)
     
  • S. Kariyo, S. Stapf, B. Blümich
    Restricted molecular dynamics of polymer chains by means of NMR field cycling relaxometry
    Macromol. Chem. Phys. 206, 1300-1310 (2005)
     
  • S. Kariyo, S. Stapf
    Site-specific proton and deuteron NMR relaxation dispersion in selectively deuterated polyisoprene
    Macromol. Chem. Phys. 206, 1292-1299 (2005)
     
  • S. Stapf, X. Ren, E. Talnishnikh, B. Blümich
    Spatial distribution of coke residues in porous catalyst pellets analyzed by field-cycling relaxometry and parameter imaging
    Magn. Reson. Imaging, 23, 383-386 (2005)
     
  • S. Kariyo, M. Küppers, M. Badiger, A. Prabhakar, B. Jagadeesh, S. Stapf, B. Blümich
    Morphology and chain dynamics during collapse transition of PNIPAM gels studied by combined imaging, relaxometry, and 129Xe spectroscopy techniques
    Magn. Reson. Imaging, 23, 249-253 (2005)
     
  • D. Tang, A. Jess, X. Ren, B. Blümich, S. Stapf
    Axial dispersion and wall effects in narrow fixed bed reactors – a comparative study based on RTD- and NMR-measurements
    Chem. Eng.Technol. 27, 866-873 (2004)
     
  • Z. Fojud, E. Szczesniak, S. Jurga, S. Stapf, R. Kimmich
    Molecular dynamics of n-dodecylammonium chloride in aqueous solutions investigated by 2H NMR and 1H NMR relaxometry
    Solid State Nucl. Magn. Reson. 25, 200-206 (2004)
     
  • S. Kariyo, S. Stapf
    NMR relaxation dispersion of vulcanized natural rubber
    Solid State Nucl. Magn. Reson. 25, 64-71 (2004)
     
  • B. Doumèche, M. Küppers, S. Stapf, B. Blümich, W. Hartmeier, M. B. Ansorge-Schumacher
    New approaches to the visualisation, quantification and explanation of acid-induced water loss from Ca-alginate hydrogel beads
    J. Microencapsulation 21, 565-573 (2004)
     
  • X.-H. Ren, S. Stapf, B. Blümich
    Nuclear magnetic resonance velocity imaging and velocity distribution measurements for flow in model fixed-bed reactors of low tube-to-particle diameter ratio
    AIChE J. 51, 392-405 (2005)
     
  • S. Kariyo, S. Stapf
    Influence of cross-link density and deformation on the NMR relaxation dispersion of natural rubber
    Macromolecules 35, 9253-9255 (2002)
     
  • X.-H. Ren, S. Stapf, H. Kühn, D. E. Demco, B. Blümich
    Molecular mobility in fixed-bed reactors investigated by multiscale NMR techniques
    Magn. Reson. Imaging 21, 261-268 (2003)
     
  • A. A. Khrapitchev, S. Han, S. Stapf, B. Blümich
    Spectrally Resolved Velocity Exchange Spectroscopy of Two-Phase Flow
    J. Magn. Reson. 159, 36-45 (2002)
     
  • A. A. Khrapitchev, S. Stapf, P. T. Callaghan
    NMR visualisation of displacement correlations for flow in porous media
    Phys. Rev. E 66, 051203/1-16 (2002)
     
  • S. Stapf
    NMR investigations of correlations between longitudinal and transverse displacements in flow through random structured media
    Chem. Phys. 284, 369-388 (2002)
     
  • M. Küppers, C. Heine, S. Han, S. Stapf, B. Blümich
    In-situ observation of diffusion and reaction dynamics in gel microreactors by chemically resolved NMR microscopy
    Appl. Magn. Reson. 22, 235-246 (2002)
     
  • C. Heine, S. Stapf, B. Blümich
    Two- and three-dimensional waves in falling-film flow in the non-laminar flow regime – an NMR study
    Appl. Magn. Reson. 22, 223-233 (2002)
     
  • S. Stapf, S. Han, C. Heine, B. Blümich
    Spatio-temporal correlations in transport processes determined by multi-PFG experiments
    Concepts Magn. Reson. 14, 172-211 (2002)
     
  • R. Savelsberg, D. E. Demco, B. Blümich, S. Stapf
    Particle motion in gas-fluidized granular systems by pulsed-field gradient nuclear magnetic resonance
    Phys. Rev. E 65, 020301(R)/1-4 (2002)
     
  • X.-H. Ren, M. Bertmer, S. Stapf, D. E. Demco, B. Blümich, C. Kern, A. Jess
    Deactivation and regeneration of a naphtha reforming catalyst, Applied
    Catalysis A 228, 39-52 (2002)
     
  • A. A. Khrapitchev, S. Stapf, P. T. Callaghan
    Dispersion in porous bead packs studied by velocity exchange spectroscopy
    NATO Science Series II: Mathematics, Physics and Chemistry, Vol. 76, 553-558 (2002)
     
  • X. H. Ren, M. Bertmer, H. Kühn, S. Stapf, D. E. Demco, B. Blümich, C. Kern, A. Jess
    1H, 13C and 129Xe NMR study of changing pore size and tortuosity during deactivation and decoking of a naphtha reforming catalyst
    NATO Science Series II: Mathematics, Physics and Chemistry, Vol. 76, 603-608 (2002)
     
  • S. Han, S. Stapf, B. Blümich
    Catching a falling drop by NMR: correlation of position and velocity
    NATO Science Series II: Mathematics, Physics and Chemistry, Vol. 76, 327-336 (2002)
     
  • B. Blümich, S. Han, C. Heine, R. Eymael, M. Bertmer, S. Stapf
    Analysis of slow motion by multidimensional NMR
    NATO Science Series II: Mathematics, Physics and Chemistry, Vol. 76, 3-14 (2002)
     
  • S. Stapf, C. Heine, S. Han, B. Blümich
    Spatio-temporal correlations in gravity-driven and pressure-driven fluid transport processes
    NATO Science Series II: Mathematics, Physics and Chemistry, Vol. 76, 423-432 (2002)
     
  • C. Heine, K. Kupferschläger, S. Stapf, B. Blümich
    NMR velocimetry of falling liquid films
    J. Magn. Reson. 154, 311-316 (2002)
     
  • S. Han, S. Stapf, B. Blümich
    NMR imaging of falling water drops
    Phys. Rev. Lett. 87, 144501/1-4 (2001)
     
  • B. Blümich, P. T. Callaghan, R. A. Damion, S. Han, A. A. Khrapitchev, K. J. Packer, S. Stapf
    Two-dimensional NMR of velocity exchange: VEXSY and SERPENT
    J. Magn. Reson. 152, 162-167 (2001)
     
  • S. Stapf
    Determination of velocity autocorrelation functions by multiple data acquisition in NMR pulsed-field gradient experiments
    J. Magn. Reson. 152, 308-312 (2001)
     
  • S. Stapf, B. Blümich
    Multi-gradient pulse investigations of fluid transport in porous media
    Magn. Reson. Imaging 19, 385-389 (2001)
     
  • B. Blümich, D. E. Demco, S. Stapf, U. Görke, C. Chwatinski, L. Gasper, R. Giesen, R. Haken, S. Han
    Functional NMR imaging of materials
    Polymeric Materials Science and Engineering  82, 148 (2000)
     
  • S. Han, S. Stapf, B. Blümich
    Two-dimensional PFG NMR for encoding correlations of position, velocity and acceleration in fluid transport
    J. Magn. Reson. 146, 169-180 (2000)
     
  • M. I. Menzel, S. Han, S. Stapf, B. Blümich
    NMR characterization of the pore structure and anisotropic self-diffusion in salt water ice
    J. Magn. Reson. 143, 376-381 (2000)
     
  • S. Stapf, K. J. Packer, S. Békri, P. M. Adler
    Two-dimensional NMR measurements and numerical simulations of fluid transport in porous rocks
    Phys. Fluids 12, 566-580 (2000)
     
  • S. Stapf, K. J. Packer
    Two-dimensional propagators and spatio-temporal correlations for flow in porous solids: a comparative study
    Appl.Magn. Reson. 15, 303-322 (1998)
     
  • S. Stapf, R. A. Damion, K. J. Packer
    Time correlations in fluid transport obtained by sequential rephasing gradient pulses
    J. Magn. Reson. 137, 316-323 (1999)
     
  • S. Stapf, K. J. Packer, R. G. Graham, J.-F. Thovert, P. M. Adler
    Spatial correlations and dispersion for fluid transport through packed glass beads
    Phys. Rev. E  58, 6206-6221 (1998)
     
  • I. Ardelean, R. Kimmich, S. Stapf, D. E. Demco
    The nonlinear stimulated echo in the presence of inequivalent spins
    J. Magn. Reson. 132, 138-143 (1998)
     
  • K. J. Packer, S. Stapf, J. J. Tessier, R. A. Damion
    The characterisation of fluid transport in porous solids by means of pulsed magnetic field gradient NMR
    Magn. Reson. Imaging 16, 463-469 (1998)
     
  • F. Grinberg, R. Kimmich, S. Stapf
    Molecular dynamics and order of microconfined liquid crystals
    Magn. Reson. Imaging 16, 635-637 (1998)
     
  • T. Zavada, S. Stapf, R. Kimmich
    Diffusion and relaxation in interface layers of crystals in nanoporous materials
    Magn. Reson. Imaging 16, 695-697 (1998)
     
  • T. Zavada, S. Stapf, U. Beginn, R. Kimmich
    Field-cycling proton NMR relaxometry of molecules undergoing Lévy walks at the surface of fine particles and porous glass
    Magn. Reson. Imaging  16, 711-713 (1998)
     
  • S. Stapf, R. Kimmich
    Translational mobility in surface induced liquid layers investigated by NMR diffusometry
    Chem. Phys. Lett. 275,261-268 (1997)
     
  • S. Stapf, R. Kimmich
    Translational versus rotational molecular dynamics in plastic crystals studied by NMR relaxometry and diffusometry
    Molec. Phys. 92, 1051-1060 (1997)
     
  • I. Ardelean, R. Kimmich, S. Stapf, D. E. Demco
    Multiple nonlinear stimulated echoes
    J. Magn. Reson. 127, 217-224 (1997)
     
  • R. Kimmich, T. Zavada, S. Stapf
    NMR Experiments on molecular dynamics in nanoporous media: evidence for Lévy walk statistics
    Mat. Res. Soc. Symp. Proc. 464, 313-324 (1997)
     
  • I. Ardelean, S. Stapf, D. E. Demco, R. Kimmich
    The nonlinear stimulated echo
    J. Magn. Reson. 124, 506-508 (1997)
     
  • S. Stapf, R. Kimmich, T. Zavada
    Dynamics of plastic and liquid cyclohexane in bulk and in porous glasses studied by NMR methods
    Appl. Magn. Reson. 12, 199-212 (1997)
     
  • R. R. Valiullin, V. D. Skirda, S. Stapf, R. Kimmich
    Molecular exchange processes in partially filled porous glass as seen with NMR diffusometry
    Phys. Rev. E 55, 2664-2671 (1997)
     
  • S. Stapf, R. Kimmich, R.-O. Seitter, A. I. Maklakov, V. D. Skirda
    Proton and deuteron field-cycling NMR relaxometry of liquids confined in porous glasses
    Colloids Surfaces A: Physicochem. Eng. Aspects 115, 107-114 (1996)
     
  • F. Grinberg, R. Kimmich, S. Stapf
    Investigation of molecular order and dynamics in liquid crystals confined in porous media using the dipolar-correlation effect of the stimulated echo
    Magn. Reson. Imaging 14, 883-885 (1996)
     
  • S. Stapf, R. Kimmich, R.-O. Seitter
    Field-cycling NMR relaxometry of liquids confined in porous glass:evidence for Lévy-walks
    Magn. Reson. Imaging 14, 841-846 (1996)
     
  • R. Kimmich, S. Stapf, A, I. Maklakov, V. D. Skirda, E. V. Khozina
    Self-diffusion in fluids in porous glass: confinement by pores and liquid adsorption layers
    Magn. Reson. Imaging 14, 793-797 (1996)
     
  • S. Stapf, R. Kimmich
    Field-cycling NMR relaxometry and field-gradient NMR diffusometry of polymers confined in porous glasses: evidence for a restricted-geometry effect
    Macromolecules  29, 1638-1641 (1996)
     
  • S. Stapf, R. Kimmich
    Molecular dynamics in confined monomolecular layers. A field-cycling nuclear magnetic resonance relaxometry study of liquids in porous glass
    J. Chem. Phys., 103, 2247-2250 (1995)
     
  • S. Stapf, R. Kimmich, R.-O. Seitter
    Proton and deuteron field-cycling NMR relaxometry of liquids in porous glasses: evidence for Lévy-walk statistics
    Phys. Rev. Lett., 75, 2855-2858 (1995)
     
  • R. Kimmich, S. Stapf, R.-O. Seitter, P. T. Callaghan, E. V. Khozina
    Molecular dynamics of monomer, oligomer, and polymer liquids in porous media: a field-cycling NMR relaxometry and NMR field-gradient diffusometry study
    Mat. Res. Soc. Symp. Proc., 366, 189-200 (1995)
     
  • R. Kimmich, N. F. Fatkullin, H. W. Weber, S. Stapf
    Nuclear spin-lattice relaxation and theories of polymer dynamics
    J. Non-Cryst. Solids, 172-174, 689-697 (1994)
     
  • R. Kimmich, S. Stapf, M. Möller, R. Out, R.-O. Seitter
    Field-cycling NMR relaxation spectroscopy of poly(di-n-alkylsiloxanes) in solid, mesomorphic liquid, and isotropic liquid phases
    Macromolecules, 27, 1505-1508 (1994)
     
  • R. Kimmich, S. Stapf, P. T. Callaghan, A. Coy
    Microstructure of porous media probed by NMR techniques in sub-micrometer length scales
    Magn. Reson. Imaging, 12, 339-343 (1994)
     
  • S. Stapf, R. Kimmich, J. Niess
    Microstructure of porous media and field-cycling nuclear magnetic resonance relaxation spectroscopy
    J. Appl. Phys. 75, 529-537 (1994)

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