Synthesis and Properties of Layered Organic–inorganic Hybrid Material: Zn-Al Layered Double Hydroxide–dioctyl Sulfosuccinate Nanocomposite

A layered organic–inorganic hybrid nanocomposite was prepared by using a surfactant, dioctyl sulphosuccinate (DSS) as a guest in Zn-Al layered double hydroxide (LDH) inorganic host by a self-assembly technique. The Zn-Al ratio of the mother liquor was kept constant at 4 at the beginning of the synthesis. Powder X-ray diffractogram shows that the basal spacing of the Zn-Al LDH with sulphate as the intergallery anion (ZASUL) expanded from 11.0 to 26.3Å to accommodate the DSS surfactant anion for the formation of the Zn-Al LDH–DSS layered organic–inorganic hybrid nanocomposite (ZADON). It was also found that the BET surface area reduced by about 90%, from 22.5 to 2.2m²/g, for ZASUL and ZADON, respectively if 0.1M DSS was used for the synthesis of the latter.     

Direct and non-direct contributions to projectile fragmentation at 20 MeV/nucleon

The spectrum of projectile-like fragments in the scattering of ¹⁶O on ²⁰⁸Pb at 315 MeV is analyzed in terms of direct and non-direct contributions. The direct contribution comes from a one-step breakup process whereas the non-direct contributions consist of two terms: inelastic scattering following breakup and complex multi-step processes.     

Nucleon Isobar Production in Proton-Nucleon Collision at 6 GeV/c Incident Proton Momentum

Angular and momentum distributions as well as grain densities of charged secondaries emitted in inelastic proton-nucleon interactions are measured. The cross-section of the Δ (1236) isobar production in the events of the type pp →pnπ⁺ is calculated. The theoretical predictions of both the isobar and the O.P.E. model are compared with the experimental data. The transverse momentum distribution of both pions and protons is presented and explained by various theoretical models.     

Two-particle transfer reactions: A four-body treatment I

A method is proposed through which interaction between transferred nucleons can be introduced to all orders. The transition amplitude for the two-nucleon transfer reaction is thus obtained showing the relevant two-particle transition amplitude that describes the interaction between the transferred nucleons.In the presence of two-body bound state in the transferred pair the total cross section is split into two parts one describing the transfer of a bound system of two nucleons, the other part corresponds to corrections due to the continuum.General remarks about the application of these ideas to heavy-ion scattering are made.     

Hyperfine magnetic fields in Fe−Co alloys and their tempera ture dependences

We obtained⁵⁷Fe hyperfine field parameters from Fe₁−x-Co _x alloys (0≤x≤0.6) from 77 K to 900 K. We first discuss the origin of the low temperature hyperfine fields in terms of the 3d and 4s electrons at⁵⁷Fe atoms. The⁵⁷Fe hyperfine magnetic field (hmf) of Fe-Co alloys depends more weakly on temperature than the hmf of pure Fe. This temperature dependence occurs because the alignment of the magnetic moments at both the Fe atoms and at the Co atoms depend on temperature in the same way as the bulk magnetization of Fe-Co alloys.     

Semiclassical derivation of a local optical potential for heavy-ion elastic scattering

A semiclassical method to determine the contribution to the optical potential in the elastic channel due to the coupling to other processes taking place in heavy-ion collisions is developed. An application is made to the case of Coulomb excitation. The lowest-order term of our potential is shown to be identical to the potential derived by Baltz et al.     

Optimization of effective processing parameters of hybrid anti-corrosion Si/Zr sol–gel coatings doped with cerium salt for aluminum alloy 6061

Journal of Sol-Gel Science and Technology - In this study, the Taguchi method was used to design of experiment to obtain optimum conditions for hybrid Si–Zr sol–gel coating doped with...