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  • Conference proceedings  (31)
  • Springer  (31)
  • Nature Publishing Group
  • 1990-1994  (31)
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  • Springer  (31)
  • Nature Publishing Group
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Geometry of bicontinuous microemulsions as revealed by SANS and simulations (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1357-1366 
    Details
    ISSN: 0392-6737
    Keywords: Fluid surfaces and fluid-fluid interfaces ; Neutron scattering techniques (including small-angle scattering) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Water-octane-C10E4 microemulsions in both the isotropic and lamellar phases were measured using small-angle neutron scattering. Varying the scattering length density of both the water and oil through hydrogen-deuterium substitution enabled us to isolate the scattering contributions of the surfactant monolayers and the water-surfactant and oil-surfactant interfaces. Analyses of the resulting scattering patterns allow us to directly determine the small mean curvature of the surfactant film as a function of temperature and correlate this quantity with the overall phase behavior. A simulation using a Gaussian random field yields the three-dimensional structure of the bicontinuous microemulsion having a surfactant monolayer with zero mean curvature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462020
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  • 2
    Electronic Resource
    Electronic Resource
    Aggregating block copolymers as model systems to study polymer brush dynamics (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 747-755 
    Details
    ISSN: 0392-6737
    Keywords: Neutron scattering techniques (including small-angle scattering) ; Polymers, elastomers, and plastics ; Fluctuation phenomena, random processes and Brownian motion ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary A-B block copolymers in a selective solvent—good for the B-species and bad for the A-species—form micellar aggregates with a compact A-core with a corona (brush) of B «hairs» reaching into the solvent. Whereas polystyrene(PS)-polyisoprene(PI) in decane forms spherical micelles with a PS core of about 10 nm radius, polyethylene(PE)-polyethylenepropylene(PEP) forms micellar platelets, the shape of which is goverend by the habitus of PE crystallites forming the core. These planar aggregates have large (several hundred nanometers) lateral extension and a core thickness in the range of 10 nm. Both systems are model systems for polymer brushes, either on a spherical surface or planar. Neutron spin-echo experiments allow for the investigation of the dynamics of the brushes which reflects their viscoelastic properties. Results of neutron small-angle and spin-echo investigations are reported. The brush dynamics is explained using a model based on an idea of de Gennes describing the brush properties in terms of scaling relations for osmotic pressure and viscosity of a semi-dilute solution with inhomogeneous density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02456720
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  • 3
    Electronic Resource
    Electronic Resource
    Sound propagation and viscosity in water short-chain amphiphiles solutions, evidence of percolation phenomena (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1619-1625 
    Details
    ISSN: 0392-6737
    Keywords: Brillouin and Rayleigh scattering ; Ultrasonic relaxation processes in gases, liquids, and solids ; Acoustical properties of liquids ; Order-disorder and statistical mechanics of model systems ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary A water/butoxyethanol solution has been investigated by means of several techniques (viscosity, ultrasound and hypersound) as a function of concentration and temperature. The butoxyethanol molar fraction range investigated was situated between 0.015 and 0.09, while temperature ranged between −10°C and +45°C. We observed the building-up of large structures lowering the temperature, in particular below +15°C. All data coming from different techniques seem to confirm such a picture and indicate that this aggregation phenomenon is a percolation-like process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462050
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic characterization of hot-pressed BSCCO (2223) phase superconducting ceramic (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1871-1876 
    Details
    ISSN: 0392-6737
    Keywords: Magnetization curves ; Meissner effect ; penetration depth ; Critical currents ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary BSCCO (2223) phase superconductor, prepared by the traditional solid-state reaction route, was densified by hot pressing, yielding high-density and textured-bulk materials. A correlation between processing parameters and inter-, intra-granular properties of the sample was performed through the evaluation of microstructural features and the study of electrical resistivity and magnetization behaviour as a function of different temperature and magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462187
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic study of the superconducting phase YNi2B2C (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1857-1862 
    Details
    ISSN: 0392-6737
    Keywords: Superconducting materials ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We report the synthesis procedure and the chemical-physical characterization of the YNi2B2C superconductor. From magnetic measurements we show that this material is a type-II superconductor. We evaluate the penetration depth, the coherence length and, thus, the Ginzburg-Landau parameter. Despite the low value of κ(12), a very large region of reversibility in theH-T plane is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462185
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  • 6
    Electronic Resource
    Electronic Resource
    Shielding current density in Mg-doped YBCO-123 as determined by a.c. magnetic-susceptibility measurements (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1941-1946 
    Details
    ISSN: 0392-6737
    Keywords: Superconducting materials ; General properties ; Critical currents ; Material effects onT c,x, critical currents (including impurities, ion implantation etc.) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary High-resolution a.c. magnetic-susceptibility measurements have been performed on sintered samples of Mg-doped YBCO superconductors YBa2(Cu1−x Mg x )3O7−δ (δ≤0.08, 0≤x≤0.1). An estimation of the intergranular shielding currentsJ s (T, H d.c.) has been obtained by separating the grains and coupling-junctions contributions to the measured susceptibility. The results show that Mg doping increases the weak links weight and reduces the values ofJ s. AtH d.c.=0,J s (T, 0) follows a power law of the type (1−T/T c)β, with β varying from 2 (undoped sample) to about 5 (x=2.5%). The dependence ofJ s on the applied d.c. magnetic field can be fitted to a Lorentzian lineshape whose width appears to be independent of the substitution level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462197
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  • 7
    Electronic Resource
    Electronic Resource
    Neutron scattering and compressibility measurements for the study of hydration effects on polymeric aqueous solutions (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 809-816 
    Details
    ISSN: 0392-6737
    Keywords: Polymers, elastomers, and plastics ; Neutron scattering techniques (including small-angle scattering) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The present paper reports the results of compressibility and incoherent quasi-elastic neutron scattering measurements performed on polymeric systems and on their aqueous solutions. From the compressibility data, the temperature evolution of the polymer hydration number can be derived. On the other hand, neutron data show that the translational diffusion coefficientD T turns out to be higher in the case of ethylene glycol + water, with respect to that of pure, suggesting that the water molecules act as a «structure breaker» of the intermolecular connectivity existing into the pure. Furthermore the dynamical properties of the H2O molecules in the presence of poly(ethylene glycol) deeply differ from those in the bulk, and show that we are in the presence of entangled water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02456728
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  • 8
    Electronic Resource
    Electronic Resource
    Freezing and microphase separation in random copolymers (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 873-877 
    Details
    ISSN: 0392-6737
    Keywords: Physical chemistry of solutions of biological macromolecules ; Order-disorder and statistical mechanics of model systems ; Multicritical points ; Macromolecules and polymer molecules: Constitution (chains and sequences) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary A two-letter random copolymer with attraction between similar monomers and repulsion between different ones is investigated using the replica method. This type of interactions favors microphase separation (MPS) in a compact state of a polymer or in a melt. Frustrations between interactions and polymeric bonds may lead to freezing transition in a phase where only a few conformations dominate and replica symmetry is broken. Our analysis reveals that stiff polymers have a frozen phase and do not undergo transition to a phase with microdomain structure. In flexible polymers the microphase transition may occur before freezing. A complete phase diagram showing the interplay between the two phase transitions is constructed for the two-letter random copolymer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02456737
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  • 9
    Electronic Resource
    Electronic Resource
    Nature of depolarized quasi-elastic light scattering in associated and non-associated liquids (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 901-910 
    Details
    ISSN: 0392-6737
    Keywords: Brillouin and Rayleigh scattering ; Visible and ultraviolet spectra: Liquids ; Molecular liquids ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary An analysis of Rayleigh-wing spectra on two isomers of propanol (C3H7OH) and on two of their Br-based isomorphous systems (C3H7Br) is presented. The performed measurements, over a wide temperature range, allow us to identify two different processes characterizing the response of both the alcohols. A comparison between the rotational dynamics of the linear normal-propanol (1-propanol) and the more sterically hindered iso-propanol (2-propanol) is performed. At the same time, the role played by the H-bond in the associative properties of hydrogenous systems is investigated by comparing the dynamical response of the two alcohols with that of 1-bromopropane and 2-bromopropane, in which the O−H «active» sites are replaced by «inert» bromine atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02456741
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  • 10
    Electronic Resource
    Electronic Resource
    Diffusion of testing particles in turbulent nematic liquid crystals (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1253-1258 
    Details
    ISSN: 0392-6737
    Keywords: Liquid crystals ; Turbulence, fluid dynamics ; Diffusion and ionic conduction in liquids ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We report on the diffusive motion of dielectric testing particles floating in a turbulent nematic fluid under the effect of an external oscillating electric field. The particle is viewed as a tracer of the underlying turbulence. We calculate the diffusion coefficients and the probability distribution of the particle displacements, thus showing that the motion of the particle is a classical Brownian diffusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02458809
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