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11 citations found for Shibayama, M
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A robust high-temperature high-pressure cell with a metal window for small-angle neutron scattering (SANS) experiments has been developed. This cell enables in situ SANS experiments on materials within sub- and supercritical water environments.
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The high-resolution detector on the SANS-U spectrometer at the Japan Atomic Energy Agency has been upgraded by improving experimental efficiency with the optimization of the thickness of a ZnS/6LiF scintillator.
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The small-angle neutron scattering spectrometer SANS-U has been successfully upgraded from a conventional pinhole small-angle neutron scattering spectrometer to a focusing small-angle neutron scattering spectrometer.
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Droplet density, ϕ, dependence of the water-in-oil droplet structure of microemulsion was investigated by means of small-angle neutron scattering (SANS) at room temperature in a ternary system consisting of AOT (Aerosol-OT; dioctyl sulfosuccinate sodium salt), water, and n-decane. SANS profiles from 2 different contrast samples of the bulk contrast (AOT/D2O/C10H22) and of the film contrast (AOT/D2O/C10D22) were collected. By introducing a relative form factor as the ratio of scattering functions of the bulk and film contrast samples, we evaluated the ϕ dependence of the shape and size of droplets without the influence of the structure factor, S(Q). The mean radii of droplet core and shell were constant, while the polydispersity index decreased for ϕ ≤ ϕ* ≃ 0.62. The evaluated structure factors S(Q) from the bulk-contrast samples were in good agreement with those from the film contrast. From the ϕ dependence of S(Q), we confirmed that the droplet density fluctuations were dominant at low-ϕ regime and the inter-droplet correlations at high-ϕ regime. The crossover concentration of these two regimes was estimated to be about 0.25. It is demonstrated that this relative form factor method is quite useful for SANS experiments.
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The upgrades of SANS-U at the JRR-3M research reactor of the Japan Atomic Energy Research Institute include (i) replacement of the two-dimensional area detector by a multi-wire type position-sensitive proportional counter, (ii) renewal of the operating system from a VAX and sequencers to an integrated PXI system controlled by LabVIEW-RT software, (iii) a focusing collimation system, and (iv) a variety of accessory equipment.
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Small-angle neutron scattering and dynamic light scattering have been complementarily employed in order to investigate the structure and dynamics of polymer gels. It is demonstrated that complementary use is necessary to explore the dynamics of polymer gels, particularly that of slide-ring gels in which cross-links can slide along the backbone polymer chain.
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A novel method to evaluate the incoherent scattering intensity for hydrogen-containing materials is proposed. This method needs only the transmission and the sample thickness.