Skelton and Satire

Craig, Hardin

doi:10.1484/j.mss.3.276

Cited by 2 publications

(2 citation statements)

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“…Fick's first law for diffusion across a membrane with a linear concentration gradient is J , = Dei,(Acs/tm) (6) where Deff is the effective coefficient when the driving force is based upon concentrations in the external solution (at the membranesolution interface) and t, is the membrane thickness. Consequently…”

Section: Combination Of Eqs (3) and (4) Givesmentioning

confidence: 99%

Permeability studies with cellulosic membranes

Colton

Smith

Merrill

et al. 1971

J. Biomed. Mater. Res.

161

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SummaryThe true diffusive permeabilities of commercial, modified commercial, and laboratory cast regenerated cellulose membranes were measured wit,h a batch dialyzer using 15 solutes (sodium chloride, nine radioactively labelled organic solutes, and five low molecular weight proteins) ranging in molecular weight from 58 to 68,000. Additional measurements included membrane thickness, water content, and strengt,h propertie?, as well as equilibrium solut,e partition coefficients and solute diffusion coefficients in free solution. All commercial cellophanes were similar in sodium chloride permeability on a unit, t,hickness basis and were significantly less permeable than hydrophilic wet gel membranes. This difference was attributed to the irreversible collapse of membrane struct,ure upon drying. As the solute characteristic size increased, permeability decreased more sharply with commercial cellophane than with wet, gel cellulose, the ratio between the two becoming an order of magnitude for large solutes. The ratio between the solut,e diffusioa coefficient, in the membrane and in free solution decreased exponentially with increasing solute size. The results suggest further work for higher permeability cellulosic hemodialysis membranes.

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Section: Combination Of Eqs (3) and (4) Givesmentioning

confidence: 99%

Permeability studies with cellulosic membranes

Colton

Smith

Merrill

et al. 1971

J. Biomed. Mater. Res.

161

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“…The experimental requirements for an investigation of this kind have been discussed elsewhere, (24) as has the apparatus assembled for the present Briefly, it consists of a 1-m3 stainless steel chamber after LEACH and S P I E G L , (~~) air moving and conditioning equipment, and instruments for measuring the flow rate, differential pressure, temperature and relative humidity of the air. Figure 1 shows the apparatus schematically.…”

Section: Experimental Apparatus and Techniquesmentioning

confidence: 99%

An Investigation of the Interactions That Occur Between I2 Radionuclides and an Iron Oxide Aerosol in the Respirable Size Range

Craig¹

1966

Health Physics

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Aerosols, whether pre-existing in the atmosphere or generated in a nuclear incident, represent surfaces to which radionuclides that escape into the environment can become attached. The importance of the relationship between adsorbed activity and aerosol particle size is discussed. The conclusions from previous studies, most of which have utilized the decay products of radon and thoron as radionuclides, are contradictory. In the present work, a labelled iron oxide aerosol was allowed to interact with radionuclides consisting of molecular iodine. The Goetz Aerosol Spectrometer was used to characterize the adsorption of the iodine onto the aerosol as a function of particle size. Relative radionuclide-aerosol concentrations were varied from 3 x lo2 to 3 x lo5 molecules per particle. The following conclusions were drawn from these experiments: first, the adsorbed activity appeared to be proportional to a function dz of the particle diameter, where 2 < 2 < 3, over the approximate size range 0.06 < d < 1.2 p ; secondly, even at the lowest radionuclide concentration used (9 x pug 12/1), some of the iodine seemed to be present in the form of very small particulates (tO.O1 p ) , a factor which complicated interpretation of the above result; thirdly, the adsorption of iodine onto surfaces was at least partially reversible; and finally, variation of the experimental conditions over a considerable range did not significantly affect the results.

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Skelton and Satire

Cited by 2 publications

References 0 publications

Permeability studies with cellulosic membranes

Permeability studies with cellulosic membranes

An Investigation of the Interactions That Occur Between I2 Radionuclides and an Iron Oxide Aerosol in the Respirable Size Range

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