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The effect on ~3mbra~e reslstlvlty of soaklng ln aCldlfied lron solu- tions of various Fe /Fe+ ratios lS presented in figure 16. The Ilfoullng" effect is seen to be due to the presence of ferrlC lon. Th1S foul1ng is most likely the result of an 1nteract1on between the positive charges with1n the membrane and the negatively charged chloro-complexes of the ferr1c ion. Foul1ng is a reversible phenomenon 1n that resist1vity re- turns to the orig1nal value observed in 2.0 NHCl when a fouled membrane is resoaked 1n 2.0 N HC1. Resistivity stab1l1ty is determined by means of the resistivity flow test, which 1nvolves measurement of area resistiv1ty as a function of time. Test durations are approx1mately 150 h. Most stable membranes exhibit an 1n1tial resistance 1ncrease and then level off witn1n the prescribed period of time. Complete data and results of tests performed on membrane samples, other than the new th1n fabrics, are given 1n references 1 and 5. An examinat10n of data obtained from resistivity, selectivity, and per- formance tests 1nd1cates that the CDIL-AA5-0.0625 catalyst membrane 1S the best membrane to date for use in Redox energy storage systems. It is now being used as the standard membrane in Redox system tests, replac1ng the former standard CDIL-A5-0.5 catalyst membrane. Deta1ls are given in reference b. The new th1nner membranes are prom1sing with respect to area- resistlv1ty reductlon. Attempts are now being made to 1ncrease select1vity without chang1ng the improved area resistivlty. Lewis Research Center - Membrane Model1ng Background. - As the Redox system cycles through charge and discharge, the volume of the reactant Solut1on contain1ng chrom1um has been observed to steadily increase over a per10d of time. For exam~le, dur1ng a 3-week 1nterval t~e transfer rate for a six-cell, 0.33-ft stack (total membrane area, 2 ft ) averaged 0.9 millil1ter/h. An analysis was undertaken in order to identify the phenomena contributing to this Solut1on transfer and to determine their relative slgn1ficance. The theoretical approach, coupled w1th support1ng experimental work, w1ll provide a gU1de for the stabilization or elim1nat1on of Solut1on transfer. Approach. - Because the membrane 1S permeable to three species (H+, Cl-, and H20), transport can be descr1bed by using three flux equations. Expressed 1n terms of the measurable quant1t1es of volume flux Jv, solvent flux Js' and current I, the equat10ns are Jv=Ll1 (~p - ~~) +L12 (~~s/Cs) +L13E Js = L21 (~p - ~~) + L22 (~~s/Cs) + L23E (1) I =L31 (~p - ~~) + L32 (~~s/Cs) + L33E where ~p 1S the hydrostatic pressure difference, ~~ is the osmotic pressure d1fference due to the 1mpermeable spec1es, ~~s 1S the osmot1c pressure 16PDF Image | NASA Redox Storage System Development Project 1980
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