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  • 1
    Electronic Resource
    Electronic Resource
    Hydration of ionic surfactant micelles from water oxygen-17 magnetic relaxation (1981)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 85 (1981), S. 2142-2147 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150614a037
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  • 2
    Electronic Resource
    Electronic Resource
    Interpretation of counterion spin relaxation in polyelectrolyte solutions (1984)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 88 (1984), S. 2482-2494 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150656a013
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  • 3
    Electronic Resource
    Electronic Resource
    Shape fluctuations and water diffusion in microemulsion droplets: a nuclear spin relaxation study (1989)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 93 (1989), S. 3287-3299 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100345a080
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  • 4
    Electronic Resource
    Electronic Resource
    Deuterium NMR relaxation in phospholipid bilayers: toward a consistent molecular interpretation (1991)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 6724-6733 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100170a062
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  • 5
    Electronic Resource
    Electronic Resource
    Counterion surface diffusion in a lyotropic mesophase: a sodium-23 two-dimensional quadrupolar echo NMR relaxation study (1990)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 94 (1990), S. 2600-2613 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100369a070
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  • 6
    Electronic Resource
    Electronic Resource
    Micelle size and order in lyotropic nematic phases from nuclear spin relaxation (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 3875-3891 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Nuclear magnetic resonance (NMR) relaxation of quadrupolar nuclei is introduced as a new method for determining micelle size and nematic order in lyotropic nematic mesophases from the dependence of the spin relaxation rates on molecular diffusion over the curved micelle surface. The approach is illustrated by an experimental study of two uniaxial nematic phases (the calamitic NC and discotic ND phases of the sodium dodecyl sulphate/decanol/water system) using two nuclei: 2H in the α-deuterated surfactant and 23Na in the counterions. The two nuclei yield similar results: an apparently temperature independent axial ratio of 3–4 in both phases and a nematic order parameter which decreases from ca. 0.9 (0.75) at the lowest temperature to ca. 0.6 (0.5) at the highest temperature in the NC (ND) phase. As compared to the predictions of the Maier–Saupe theory, the nematic order parameter in the NC phase is considerably larger and decreases more strongly as the nematic–isotropic transition is approached.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461892
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  • 7
    Electronic Resource
    Electronic Resource
    Nuclear spin relaxation in a hexagonal lyotropic liquid crystal (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 6945-6961 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The hexagonal (E) phase in the sodium dodecyl sulphate (SDS)/decanol/water system is investigated by 2H and 23Na nuclear magnetic resonance (NMR) of the selectively deuterated SDS and the sodium counterion. Using macroscopically oriented E phase samples, prepared from the magnetically aligned nematic (NC) phase, we measure the orientation-dependent relaxation rates R1Z and R1Q as well as the line shape of both nuclei. The orientation dependence of the lab-frame spectral densities, determined from the relaxation rates, allow us to separate contributions from different types of molecular motion. In particular, we find a dominant contribution from molecular diffusion around the cylindrical aggregate. From this contribution we determine the lateral diffusion coefficient of SDS to (1.4±0.2)×10−10 m2 s−1 at 25 °C (activation energy 26±2 kJ mol−1 ) and the counterion surface diffusion coefficient to (4.8±0.9)×10−10 m2 s−1 at 25 °C (a factor 2.8 smaller than in an infinitely dilute aqueous electrolyte solution). Furthermore, the flexibility of the cylindrical aggregates in the investigated E phase (aggregate volume fraction 0.27) is quantified in terms of an orientational order parameter SDC≈0.9.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461506
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  • 8
    Electronic Resource
    Electronic Resource
    Theory of spin relaxation by diffusion on curved surfaces (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 3150-3168 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A comprehensive theoretical analysis is presented which accounts for nuclear spin relaxation due to molecular surface diffusion on spheroidal aggregates undergoing restricted rotational diffusion in a uniaxial potential of mean torque. The model is formulated primarily with surfactant systems in mind, and should provide a realistic description of spin relaxation in nematic and smectic liquid crystals as well as in isotropic micellar solutions. Two efficient numerical schemes are developed to compute the joint time correlation functions and spectral density functions. In addition, a variety of useful analytical results are derived for special cases. Numerical calculations suggest that nuclear spin relaxation may be a unique method for monitoring small deviations from spherical aggregate shape.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460689
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  • 9
    Electronic Resource
    Electronic Resource
    Spin relaxation of I〉1 nuclei in anisotropic systems. II. Inversion recovery and even-rank polarization decay (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 42-51 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The response of half-integral spin I〉1 nuclei in anisotropic systems to pulse sequences that probe longitudinal quadrupolar relaxation is investigated. The dynamical coupling among polarizations of different rank renders the response more complicated than in the case of I=1 nuclei. Nevertheless, for I=3/2 and I=5/2 nuclei, exponential or biexponential spectral decays can be produced that enable accurate determination of the motional spectral densities j1 and j2. While the inversion recovery experiment, which probes the evolution of the odd-rank polarizations, is useful mainly for I=3/2, the decay of the even-rank polarizations is conveniently analyzed also for I=5/2. We thus describe pulse sequences, analogous to the Jeener–Broekaert sequence for I=1, that yield exponential decay for I=3/2 and biexponential (sum or difference) decay for I=5/2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457477
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  • 10
    Electronic Resource
    Electronic Resource
    Theory of spin relaxation in bicontinuous cubic liquid crystals (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 1401-1415 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A theoretical framework is presented for the interpretation of spin relaxation data from bicontinuous cubic lyotropic phases described by periodic minimal surfaces. Specifically, the two irreducible time correlation functions (TCFs) that determine the contribution from surface diffusion to the observable spin relaxation rates are considered. Simple analytical results are obtained that relate the initial TCFs to the fourth-rank orientational order parameter of the dividing interface and the initial decay of the TCFs to the average Gaussian curvature over the cubic unit cell. These exact results are used to construct single-exponential approximations for the TCFs. Explicit calculations are reported for the three cubic triply periodic minimal surfaces of simplest topology, i.e., Schwarz's D and P surfaces and Schoen's gyroid surface, as well as for the corresponding parallel surfaces that have been used to model the dividing interface (the locus of surfactant headgroups) in bicontinuous cubic phases. The theoretical results presented here demonstrate that spin relaxation data can provide quantitative information about microstructure in bicontinuous cubic phases in surfactant and lipid systems. In particular, the spin relaxation method can discriminate among different microstructures belonging to the same space group, such as the P and C(P) surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463266
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