Comparative Study Of Transport Research Articles

Elaboration and characterisation of a plasticized cellulose triacetate membrane containing trioctylphosphine oxyde (TOPO): Application to the transport of uranium and molybdenum ions

Abstract A cellulose triacetate (CTA) membrane containing trioctylphosphine oxyde (TOPO) as carrier and 2-nitrophenyloctyl ether (NPOE) as a plasticizer was prepared. The membrane CTA + NPOE + TOPO was characterised using chemical techniques as well as Fourier Transform InfraRed (FTIR) spectroscopy, X-ray diffraction and Scanning Electron Microscopy (SEM). The CTA membrane is characterised by well-defined pores; these pores are completely filled with the NPOE and carrier. Surfaces of membranes with TOPO are smooth. The systems constituted by the mixture of CTA + NPOE, CTA + NPOE + TOPO do not give any diffraction. This can be due to the absence of crystallization within the membrane. On the other hand, this result should be attributable to the amorphous state of the structure, which permits us to eliminate the mechanism of transfer of the ions by electron jump. A comparative study of transport across a polymer inclusion membrane (PIM) and a supported liquid membrane (SLM) containing the same carrier in chloroform has shown that uranium or molybdenum transport efficiency was increased using PIM instead of SLM. PIM showed higher stability than SLM, the flux of transport remain constant in the former case after 2 weeks.

Comparative study of transport of exogenous radioactive histone administered by various routes

Accumulation of radioactive label in olfactory bulbs is found to outstrip the label content in the blood of animals to which histone is administered intranasally. The concentration of the label in the blood is highest after intraperitoneal injection, but shortly afterwards radioactive histone is detected in the brain as well.

Comparative study of magnetic and transport properties and E- J characteristics analysis of epitaxial YBa 2Cu 7− δ thin films

A comparative study of transport and magnetic properties was made for epitaxial YBa 2Cu 3O 7−δ thin films. Good correspondence was found for the current-voltage characteristics determined by transport and magnetic measurements. This fact gives direct evidence for the validity of the Bean model in the case of thin films. Different types of E( J) relations were analysed. The best agreement was found for the current-voltage characteristics with the vortex activation energy dependence U( J) = U O( J O/ J) μ . The temperature dependences of the parameter μ are obtained for different magnetic fields.